KR102077272B1 - Battery module and protecting structure applied for the same - Google Patents

Abstract

Provided is a battery module to which a structure capable of preventing breakage of a weld between an electrode lead and a bus bar of a secondary battery is provided. The battery module according to the present invention includes a secondary battery stack configured to have a plurality of secondary batteries including electrode leads stacked thereon; And a voltage sensing structure including a bus bar welded to the electrode lead and a PCB connected to the bus bar to sense the voltage of the secondary battery, wherein the electrode lead and the bus are welded onto the electrode lead and the bus bar. It further comprises a protective structure for coupling the bar.

Description

Battery module and protecting structure applied for the same}

The present invention relates to a battery module, and more particularly, a battery module to which a voltage detection structure for a plurality of secondary batteries provided in a secondary battery stack is applied, a manufacturing method thereof, a battery pack including such a battery module, and such a battery. It relates to a component that can be applied to the module.

In recent years, the demand for portable electronic products such as laptops, video cameras, mobile phones, etc. is rapidly increasing, and development of electric vehicles, energy storage batteries, robots, satellites, and the like is in full swing. There is an active research on.

Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. It has been spotlighted for its very low self discharge rate and high energy density.

Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. The 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 interposed therebetween, and a packaging material for sealing and storing the electrode assembly together with an electrolyte, that is, a battery case.

In general, a lithium secondary battery may 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, according to a shape of an exterior member.

Recently, secondary batteries are 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 environmental interest is increasing, demand for hybrid and electric vehicles is increasing worldwide, including the United States, Europe, Japan, and Korea. The most essential component of such a hybrid or electric vehicle is a battery pack that provides driving power to a vehicle motor. Since hybrid vehicles and electric vehicles can obtain driving power of the vehicle through charging and discharging of battery packs, users are increasing in terms of fuel efficiency and emission or reduction of pollutants compared to cars using only engines. In addition, the battery pack of the hybrid vehicle or the electric vehicle includes a plurality of secondary batteries, and the plurality of secondary batteries are connected to each other in series and in parallel to improve capacity and output.

Meanwhile, the battery pack includes various battery pack protection devices such as a battery management system (BMS) in addition to the secondary battery. Such protection devices may play various roles such as managing charge and discharge of the battery pack and ensuring safety. Such protection devices may perform their functions in consideration of various factors, and representative of such factors may be the voltage of each secondary battery. For example, the specific protection device may prevent overcharging or overdischarging of the secondary battery through voltage values at both ends of each secondary battery, and may perform a balancing function to reduce the variation in state of charge between the secondary batteries.

As such, in performing a specific function of the protection device included in the battery pack, sensing the voltage of each secondary battery included in the battery pack may be very important and necessary, and thus, such a secondary battery may be used in a conventional battery pack. Most of the configuration for detecting the voltage of is applied. Typical voltage sensing structures are wire type and PCB type.

The wire type is connected to the electrode part of the secondary battery by a clip or the like. This type of wire is excellent in assembly, but the cost of parts increases due to the addition of wire parts. In addition, the sensing unit coupled to the upper and lower ends of the secondary battery stack is connected by a wire, thereby increasing the secondary battery stack in the length direction, thereby increasing the unit cost.

PCB type is connected by welding the electrode part of the secondary battery and the busbar. This type of PCB leads to product cost savings by eliminating wire components. However, the weld has a risk that the connection may be dropped by vibration or shock. Accordingly, the welding part may be damaged during assembly of the module or when an external force (impact situation, etc.) is applied, and when applied to a device having a lot of vibration, such as a battery pack of an automobile, a failure occurs frequently. In particular, since breakage occurs frequently from both ends of the welded part, countermeasures are required.

Accordingly, the present invention has been made to solve the above problems, the problem to be solved by the present invention is to provide a battery module is applied to the configuration that can prevent the breakage between the electrode lead and the bus bar of the secondary battery. .

Another problem to be solved by the present invention is to provide a protective structure for protecting the welding between the electrode lead and the bus bar of the secondary battery to be applied to such a battery module.

A battery module according to the present invention for solving the above problems, the secondary battery stack comprising a plurality of secondary batteries having an electrode lead laminated; And a voltage sensing structure including a bus bar welded to the electrode lead and a PCB connected to the bus bar to sense the voltage of the secondary battery, wherein the electrode lead and the bus are welded onto the electrode lead and the bus bar. It further comprises a protective structure for coupling the bar.

The bus bar may be welded to the electrode lead by laser welding.

The electrode lead may have a bent portion, and the bus bar may be welded to two electrode leads having the bent portions overlapping each other. In this case, the bent portions of the two overlapping electrode leads may be bent in different directions.

In a preferred embodiment, the protective structure includes a top cover portion surrounding the upper surface of the welding portion, and a side cover portion extending from both sides of the top cover portion to surround both sides and the bottom surface of the electrode lead and bus bar. The top cover portion and the side cover portion may be integrally configured. The electrode lead is bent from both sides of the bus bar and overlaps the bus bar to form the welding part, the upper cover part is formed along the welding part, and the side cover part is fastened by wrapping the electrode lead and the bus bar around the welding part. It may be.

Here, a bent portion is formed at the end facing each other of the side cover portion, the electrode lead and the bus bar may be installed in a state seated on each bent portion. The bending part may be parallel to the upper cover part so as to support the bus bar by surface contact. Each side cover portion may have the form of a circle or arc. The protective structure is elastically deformed and preferably elastically supported on both sides of the upper surface of the welded part and the bottom surface of the electrode lead and the bus bar.

The protective structure may be an insulating material, or may be to couple the electrode lead and the bus bar in a snap fit manner.

For example, the protective structure may have a top cover portion surrounding the upper surface of the welding portion and a side cover portion formed in a hook shape at both ends thereof to sandwich the side and bottom surfaces of the electrode lead and the bus bar.

In order to solve the other problem, the present invention proposes a protective structure that is fastened over the welding portion between the electrode lead and the bus bar of the secondary battery to protect the welding portion and to prevent the lifting between the electrode lead and the bus bar around the welding portion. .

One or more battery modules according to the present invention may be manufactured as a battery pack. Such a battery pack may be applied to an automobile or the like.

The present invention also provides a battery module manufacturing method as described above. In this method, the electrode leads of neighboring secondary batteries are bent and overlapped with the bus bars, and the overlapped electrode leads and the bus bars are laser-welded to form a welded portion. Then, fasten the protective structure according to the invention over the weld.

According to the present invention, there is provided a protective structure that can increase the fastening force between the bus bar and the electrode lead over the weld between the electrode lead and the bus bar.

This protective structure prevents lifting between the busbar and the electrode leads. When an external force acts on the excited part, breakage of adjacent welds occurs. In the present invention, the breakage propagation mechanism can be effectively prevented by combining the electrode lead and the busbar around the weld to prevent lifting.

Accordingly, the welding part between the busbar and the electrode lead is well maintained and can be stably operated without damaging the welding part even in a vibration environment when the module is assembled or used afterwards, thereby effectively performing necessary tasks such as voltage sensing.

In particular, the protective structure of the present invention can be added over the weld by a simple structure and fastening method, so the sensing structure, module, pack structure for sensing the voltage of the secondary battery is not complicated, simple, assembly process for connecting to the secondary battery This can be done more easily.

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a perspective view schematically showing a part of a battery module according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view illustrating a laser welding configuration of an electrode lead and a bus bar in the structure of FIG. 1.
3 illustrates a state in which a protective structure according to an embodiment of the present invention is applied to the battery module of FIG. 1.
FIG. 4 is a schematic view illustrating the electrode lead and the bus bar in detail to describe the protective structure of FIG. 3.
5 is a side view of the protective structure before fastening;
6 is a side view of a protective structure according to another embodiment of the present invention.
7 is a side view of a protective structure according to another embodiment of the present invention.
8 is a flowchart illustrating a method of manufacturing a battery module according to an embodiment of the present invention.

The objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the ordinary or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own inventions. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical spirit of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a perspective view schematically showing a part of a battery module according to an embodiment of the present invention. For convenience of illustration and description, only a part of the battery module in which the voltage sensing structure is coupled to the secondary battery stack is shown. 2 is a schematic cross-sectional view illustrating a laser welding configuration of an electrode lead and a bus bar according to an exemplary embodiment of the present invention. In the battery module of FIG. 1, a cross section parallel to the bottom surface is taken along a secondary battery stacking direction. For the convenience of illustration and description, structures that support each component are omitted and only basic components are illustrated.

1 and 2, the battery module 100 includes a secondary battery stack 15 configured to have a plurality of secondary batteries 5 including electrode leads 30 and 40 stacked thereon. A sensing block 10 having a PCB (not shown) is placed on the secondary battery stack 15, and the negative lead 30 of the secondary battery 5 adjacent to each other on the bus bar 20 connected to the PCB is disposed on the secondary battery stack 15. The positive lead 40 is overlapped. Subsequently, the electrode leads 30 and 40 and the bus bar 20 are welded with a laser to form a weld 50, through which the electrode leads 30 and 40 and the PCB may be electrically connected.

The PCB, the sensing block 10 and the bus bar 20 form a voltage sensing structure, and may use a well-known conventional voltage sensing structure. The PCB is a printed circuit board for signal transmission, and the other end of the bus bar 20 may be coupled to one side of the printed circuit to be electrically connected to the bus bar 20. Here, the other end of the bus bar 20 may mean an end opposite to the side end of the bus bar 20 that contacts the electrode leads 30 and 40. As described above, in order for the other end of the bus bar 20 to be coupled, a hole may be formed in the PCB. As the end of the bus bar 20 is inserted into the hole of the PCB, the coupling between the PCB and the bus bar 20 may be performed. Can be done.

In addition, the PCB may output the voltage sensed by the busbar 20 to the outside. To this end, the PCB is connected to the other end of the bus bar 20 on one side of the printed circuit, it may be provided with an output pin on the other side of the printed circuit. Thus, the PCB can transfer the voltage sensed by the busbar 20 to other external components, such as a BMS, via printed circuits and output pins.

The sensing block 10 may be configured to cover at least a portion of the PCB. In this case, an opening may be formed in the sensing block 10 so that an output pin provided in the PCB may be exposed to the outside.

The voltage sensing structure only needs to be connected to the secondary battery stack 15 so as to sense a voltage of the secondary battery 5 included in the secondary battery stack 15, and the voltage shown in FIG. It is not limited. For example, the PCB may further include a connector. The connector transfers the voltage information sensed by the busbar 20 to other components outside the secondary battery stack 15. For example, the connector may transmit sensed voltage information to the BMS included in the battery pack. To this end, the connector is electrically connected to the other end of the busbar 20 to provide a path for transferring the voltage sensed by the busbar 20 to an external device, and at the end of such a voltage transfer path to another external device. It may be provided with a connection terminal for connecting with the component.

The secondary battery stack 15 is an assembly of secondary batteries 5 including a plurality of secondary batteries 5, and a known secondary battery stack may be used. The secondary battery stack 15 only needs to be connected to the voltage sensing structure to constitute the battery module 100, and is not necessarily limited to the configuration shown in FIGS. 1 and 2.

The secondary battery stack 15 may include a plurality of pouch-type secondary batteries as the secondary battery 5, and the plurality of pouch-type secondary batteries may be disposed in one direction, for example, as shown in the drawing. The sides can be stacked vertically on the floor and stacked along the transverse direction.

Each pouch type secondary battery may include an electrode lead, and the electrode lead includes a negative electrode lead 30 and a positive electrode lead 40 as shown. Here, the secondary batteries 5 are bidirectional batteries having different polarity electrode leads coming out in opposite directions, and as illustrated, when the secondary batteries 5 are stacked side by side, the negative electrode lead 30 and the positive electrode lead 40 are separated from each other. The example which comprised the secondary battery laminated body 15 so that it may be arrange | positioned alternately was mentioned. Here, each of the electrode leads 30 and 40 is formed in a plate shape to protrude out of the pouch packaging material. After the bending to be welded with the bus bar 20 as shown in the figure has a bent portion.

On the other hand, the secondary battery laminate 15 may include a stacking frame for stacking a large number of pouch type secondary batteries. The stacking frame is a component used to stack secondary batteries, and is configured to hold the secondary batteries to prevent flow thereof and to be stacked on each other to guide assembly of the secondary batteries. The stacking frame may be replaced with various other terms such as a cartridge, and may be configured in the form of a rectangular ring with a hollow central portion. In this case, four corners of the stacking frame may be located at the outer circumferential portion of the secondary battery.

Referring to FIG. 2 in more detail, the electrode leads 30 and 40 protrude from the secondary battery 5, and are bent in an end bent to the left or the right to provide a flat vertical contact surface. The electrode leads 30 and 40 may be bent in different directions such that the bent portions of the electrode leads 30 and 40 having different polarities overlap with each other. For example, in the embodiment of Figure 2, the negative electrode lead 30 is formed in a form bent to the right, the positive electrode lead 40 is formed in a form bent to the left, each bent portion may be configured to overlap each other have. The bus bar 20 is brought into contact with the vertical contact surface where the bent portions of the electrode leads 30 and 40 overlap.

Therefore, in the battery module 100 according to the present invention, the coupling between the bus bar 20 and the electrode leads 30 and 40 may be formed in a stacked form in the left and right directions. Therefore, with respect to this coupling portion of the busbar 20 and the electrode leads 30 and 40, when the laser is irradiated to the outside as indicated by the arrow in FIG. 2, the busbar 20 and the electrode leads 30 and 40 are exposed. The contact portions of) may be welded together and the weld 50 may be formed along the longitudinal direction of the busbar 20 as shown in FIG. 1.

The position of the bus bar 20 may vary depending on how the voltage sensing structure is configured. In this embodiment, the bus bar 20 is located at the innermost side and the bent portion of the negative lead 30 of the left secondary battery 5 is positioned above the bus bar 20. By positioning the bent portion of the positive lead 40 of the right secondary battery 5 above, the two electrode leads 30 and 40 in which the bent portions overlap each other are welded with the busbar 20. That is, the electrode leads 30 and 40 are bent from both sides of the bus bar 20 to overlap the bus bar 20, and the weld 50 is formed.

In particular, since a plurality of secondary batteries 5 are stacked in the secondary battery stack 15, the coupling structure of the busbar 20 and the electrode leads 30 and 40 is also shown in FIG. 1 as described above. There may be a plurality. The bus bar 20 is a component for sensing the voltage of the secondary battery 5 by being in direct contact with the electrode leads 30 and 40 of the secondary battery 5. It may be made of a conductive material.

The battery module 100 according to the present invention has the structure shown in FIG. 1, that is, the electrode leads 30, 40 and the busbars over the welding portions 50 of the electrode leads 30, 40 and the busbars 20. It is characterized in that it further comprises a protective structure 200 for coupling (20).

3 illustrates a case in which the protection structure 200 according to the embodiment of the present invention is applied to the battery module 100 of FIG. FIG. 4 is a schematic view illustrating side surfaces of the electrode leads 30 and 40 and the bus bar 20 in order to explain the protective structure 200 of FIG. 3 in detail. 5 is a side view of the protective structure 200 before fastening.

3 to 5, the present invention is to prevent damage from the welding portion 50 of the electrode leads 30, 40 and the bus bar 20 when the assembly of the module and the external force (impact situation, etc.) is applied. The protective structure 200 is added to the battery module 100. The breakage of the weld 50 usually begins from the base material adjacent to the weld 50 when an external force acts in the direction in which the lift between the busbar 20 and the electrode leads 30, 40 occurs around the weld 50.

The present invention focuses on maintaining the adhesion between the busbar 20 and the electrode leads 30, 40 in order to effectively block the damage propagation mechanism. To this end, the present invention provides a protective structure 200 which can increase the fastening force between the bus bar 20 and the electrode leads 30 and 40 over the welded part 50 of the bus bar 20 and the electrode leads 30 and 40. do.

The protective structure 200 is installed in a form that simply wraps the outer circumferential surfaces of the electrode leads 30 and 40 and the bus bar 20 in the overlapped stacked state. Such a protective structure 200 may be an insulator, that is, an insulating material. And the protective structure 200 is to be formed of a material having a certain degree of elasticity that is not easily damaged by the mechanical rigidity and durability.

Partially divided description, first, the protective structure 200 has a top cover portion 210 surrounding the upper surface of the welding portion 50, the electrode lids (30, 40) and the bus bar at both ends of the top cover portion 210 ( Side cover portion 220 surrounding both sides and the bottom surface of the 20) is extended. The upper cover portion 210 and the side cover portion 220 may be formed integrally.

In this embodiment, since the electrode leads 30 and 40 that are bent over the bus bar 20 are overlapped to form a weld part 50, the electrode leads are formed on both sides of the weld part 50 formed in an elongated direction along the bus bar 20 length direction. 30, 40) are located. The upper cover part 210 is formed long along the shape of the welding part 50, and the side cover part 220 is formed at a portion where the bent electrode leads 30 and 40 are not positioned, that is, above the welding part 50. The electrode leads 30 and 40 and the bus bar 20 are surrounded by the welding part 50 and are structured to be fastened while wrapping.

In this way, as one protective structure 200 is installed in the form of surrounding the electrode leads 30 and 40 and the bus bar 20 around the welding part 50 as well, the state of being bound by the protective structure 200 is as follows. As a result, the state in which the electrode leads 30 and 40 and the bus bar 20 are in close contact with each other is maintained. As such, the fastening force between the electrode leads 30 and 40 and the bus bar 20 can be strengthened, thereby providing an excellent effect on protecting the weld 50.

The top cover part 210 has the longest of the electrode leads 30 and 40 and the bus bar 20, and in this embodiment, covers the length of the bus bar 20. Each side cover portion 220 may extend from both ends of the top cover portion 210 may have a circular or arc shape.

The protective structure 200 surrounds both sides and the bottom surfaces of the bus bars 20 and the electrode leads 30 and 40 in a state in which both side cover parts 220 are extended or spread on the welded part 50. The side cover portion 220 may be fastened in a manner of releasing. Circle or arc shape is helpful in relieving the stress caused by the deformation of the side cover portion 220 and is also advantageous to restore the original shape.

As shown in detail in FIG. 5, the distance d between the end of the side cover part 220 and the top cover part 210 is smaller than the sum of the thicknesses of the electrode leads 30 and 40 and the bus bar 20. This is when the protective structure 200 is fastened between the side cover portion 220 and the end of the upper cover portion 210, as shown by the arrow in Figure 4, the end of the side cover portion 220 is the bus bar 20 bottom surface The upper lid portion 210 is formed on the upper surface of the electrode leads 30 and 40, that is, the electrode leads 30 and 40 on both sides of the electrode leads 30 and 40 and the bus bar 20 in the laminated state, which are welded. 40 and the bus bar 20 to elastically support. When the protective structure 200 is fastened to the electrode leads 30 and 40 and the bus bar 20, the end portions of the side cover part 220 and the upper cover part 210 which are farther apart from each other than before the fastening direction are originally close to each other. While elastically deformed by pressing both sides of the electrode lead (30, 40) and the bus bar 20 laminated structure to be elastically supported. And the force to return in the direction in which the end of the side cover portion 220 and the top cover portion 210 is close to each other as originally pressed force between the electrode lead 30, 40 and the bus bar 20 of the laminated state that is welded to be. As a result, lifting between the electrode leads 30 and 40 and the bus bar 20 is prevented. As described above, through the protective structure 200 which can be in close contact with not only the welding part 50 but also the peripheral part thereof, it is possible to fundamentally block the phenomenon that damage occurs around the end of the welding part 50 due to the lifting between the members.

6 is a view of a protective structure according to another embodiment of the present invention.

Here, the protection structure 200 ′ may extend from both sides of the top cover part 210 and the top cover part 210 surrounding the upper surface of the welding part 50, so that the amount of the electrode leads 30, 40 and the busbar 20 may be increased. It includes a side cover portion 220 surrounding the side and bottom surface.

Particularly, bending portions 230 are formed at ends of the side cover portions 220 that face each other, and the electrode leads 30 and 40 and the busbars 20 are seated on the bending portions 230. Can be installed. The reason why the bending part 230 is provided is that the side cover part is formed by the weight of the electrode leads 30 and 40 and the bus bar 20 itself in the structure that surrounds the bottom surface of the bus bar 20 only by the side cover part 220. When the gaps between the 220 are loosened and the coupling is severe, the bus bar 20 may be bent around the welding part 50. Thus, the bending part 230 at the end of each side cover part 220 may be caused. This is because the bending portion 230 is primarily supported by the weight load as it is provided because it is possible to minimize the phenomenon that each side cover portion 220 is opened due to the distribution of the load.

In FIG. 6, the bending part 230 is bent inward, but the bending part 230 may be embodied in a structure facing outward as well as the inside for proper load distribution effect. In addition, as shown, the bending portion 230 is formed in parallel with the upper cover portion 210 so that the bending portion 230 can support the bus bar 20 in the surface contact there is an advantage in terms of strength reinforcement do. The bending part 230 may be bent several times as necessary to form a double or triple overlap.

The protective structure according to the invention may have a snap fit fastening structure.

Among the assembly means, the snap fit fastening structure is the most suitable fastening method especially for the assembly of plastic parts. This method forms a shape that can be interlocked with the plastic part itself so that other parts can be attached. Such snap fit fastening structures are classified into cantilever snap fit structures, annular snap fit structures, and torsional snap fit structures, and generally cantilever snap fit structures. The structure is used a lot. The cantilever snap-fit structure has a hook or a bead at the end of the protrusion extending from the base wall of the part to allow the part to be coupled thereto.

7 is a view of a protective structure according to another embodiment of the present invention.

The protective structure 200 ″ shown in FIG. 7 is to couple the electrode leads 30 and 40 and the bus bar 20 in a snap fit manner, and in particular, may be referred to as a cantilever snap fit structure. For example, the protective structure 200 ″ has a top cover portion 210 ″ and a side cover portion 220 ″ formed in a hook shape at both ends thereof. The top cover portion 210 ″ is applied over the stacked structure of the electrode leads 30 and 40 and the bus bar 20, and the side cover portion 220 is disposed in the stacked structure of the electrode leads 30 and 40 and the bus bar 20. ”) Is tightly coupled between the electrode leads 30 and 40 and the busbar 20.

As described above, the protective structure proposed in the present invention is fastened on the welding part 50 between the electrode leads 30 and 40 and the bus bar 20 of the secondary battery to protect the welding part 50 and the electrode lead around the welding part 50 ( Combining 30, 40 and the bus bar 20 is to prevent lifting between.

Since the protective structure according to the present invention closely adheres to the welded portion between the bus bar and the electrode lead and its periphery, the welded portion is well maintained, and thus the welded structure can be stably operated without damaging the welded portion even in a vibration environment during module assembly or use. Therefore, it is effective to smoothly perform necessary tasks such as voltage sensing without failure.

Meanwhile, the battery pack according to the present invention includes one or more battery modules described above. In this case, the battery pack may further include a case for accommodating the battery module, various devices for controlling charge and discharge of the battery module, such as a BMS, a current sensor, a fuse, and the like, in addition to the battery module.

The battery module or battery pack according to the present invention can be applied to an automobile such as an electric vehicle or a hybrid vehicle.

Hereinafter, an embodiment of the manufacturing method of the battery module according to the present invention described above will be described schematically.

8 is a flowchart illustrating a method of manufacturing a battery module according to an embodiment of the present invention.

Referring to FIG. 8, in the battery module manufacturing method according to the present invention, first, the electrode leads 30 and 40 are bent to form a bent portion (S110).

Next, the bent portions of the electrode leads 30 and 40 overlap each other, and the busbar 20 is brought into surface contact with the overlapped portions of the bent portions (S120).

Then, the two overlapping electrode leads 30 and 40 and the bus bar 20 are laser welded (S130).

Preferably, the step S130 may be performed by laser welding.

Thereafter, the welding unit 50 is fastened to the protective structure 200, 200 'or 200 "according to the present invention (S140).

Since the protection structure 200, 200 ′ or 200 ″ can be added over the weld 50 by a simple structure and a fastening method, the sensing structure, module, or pack structure for sensing the voltage of the secondary battery is not complicated and simple. The assembling process of connecting to the secondary battery can be performed more easily.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Meanwhile, terms used to indicate directions such as up, down, left, and right are used in the present specification, but these terms are merely for convenience of description and may vary depending on the location of the object or the location of the observer. It is obvious to those skilled in the art.

5: secondary battery 10: sensing block
15 secondary battery laminate 20 busbar
30, 40: electrode lead 50: weld
100: battery module 200, 200 ', 200 ”: protective structure
210, 210 ”: Top cover part 220, 220”: Side cover part
230: bending part

Claims (20)

A secondary battery laminate configured to have a plurality of secondary batteries including an electrode lead laminated;
A voltage sensing structure including a bus bar welded to the electrode lead and a PCB connected to the bus bar to sense a voltage of the secondary battery; And
And a protective structure fastened over the welding part of the electrode lead and the bus bar to protect the welding part and to prevent the lifting between the electrode lead and the bus bar around the welding part.
The electrode lead is bent from both sides of the bus bar to form a bent portion, wherein the bent portions overlap each other over the bus bar, and the welding portion is formed along the longitudinal direction of the bus bar.
The protective structure is formed along the welding part to cover the upper surface of the upper part of the welding part, and the electrode lid and the bus bar overlapping around the welding part by extending from both sides of the upper cover part and being formed above the welding part. The structure includes a side cover portion surrounding both sides and the bottom surface,
The protective structure is elastically deformed and elastically supported on both sides of the upper surface of the weld and the bottom of the electrode lead and the bus bar, or a battery module, characterized in that for coupling the electrode lead and the bus bar in a snap-fit method. The battery module according to claim 1, wherein the bus bar is welded to the electrode lead by laser welding. delete The battery module of claim 1, wherein the bent portions of the two overlapping electrode leads are bent in different directions. delete The battery module according to claim 1, wherein the top cover part and the side cover part are integrally formed. delete The battery module according to claim 1, wherein a bending part is formed at ends facing each other of the side cover parts, and the electrode lead and the bus bar are installed on the bending parts. The battery module as claimed in claim 8, wherein the bending part is parallel to the top cover part to support the bus bar by surface contact. The battery module according to claim 1, wherein each of the side cover parts has a shape of a circle or an arc. delete The battery module of claim 1, wherein the protective structure is made of an insulating material. delete delete delete delete delete delete delete delete

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