KR20170032098A - Battery module and protecting structure applied for the same - Google Patents

Abstract

Provided is a battery module configured to prevent breakage of an electrode lead of a secondary battery and a welded part between bus bars. The battery module according to the present invention comprise: a secondary battery laminate having a plurality of secondary batteries, which have an electrode lead, laminated thereon; 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 a protective structure coupling the electrode lead and the bus bar onto a welded part of the electrode lead and the bus bar.

Description

[0001] The present invention relates to a battery module and a protecting structure applied thereto,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery module, and more particularly, to a battery module to which a voltage detection structure for a plurality of secondary batteries provided in a secondary battery stack body is applied, a method of manufacturing the same, a battery pack including the battery module, To components that may be applied to the module.

2. Description of the Related Art In recent years, demand for portable electronic products such as notebook computers, video cameras, and portable telephones has rapidly increased, and electric vehicles, storage batteries for energy storage, robots, and satellites have been developed in earnest. Are being studied actively.

The secondary rechargeable batteries are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel- It is very popular because of its low self-discharge rate and high energy density.

These lithium secondary batteries mainly use a lithium-based oxide and a carbonaceous material as a cathode active material and an anode active material, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate each coated with such a positive electrode active material and a negative electrode active material are disposed with a separator interposed therebetween, and an outer casing, that is, a battery case, for sealingly storing the electrode assembly together with the electrolyte solution.

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

In recent years, secondary batteries are widely used not only in small-sized devices such as portable electronic devices, but also in medium to large-sized devices such as automobiles and electric power storage devices. In particular, demand for hybrid cars and electric vehicles is increasing worldwide, including the US, Europe, Japan, and Korea, as carbon energy is gradually depleted and environmental concerns are rising. The most important components in such hybrid vehicles and electric vehicles are battery packs that give drive power to vehicle motors. Since hybrid cars and electric vehicles can obtain the driving force of the vehicle through charging and discharging of the battery pack, the number of users is increasing because the fuel economy is excellent and the pollutant is not discharged or reduced as compared with a vehicle using only an engine. 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 in series and in parallel to improve capacity and output.

On the other hand, the battery pack includes various battery pack protecting devices such as a BMS (Battery Management System) in addition to the secondary battery. These protective devices can perform various roles such as managing the charge and discharge of the battery pack, ensuring safety, and the like. These protective devices can perform their functions in consideration of various factors. One representative of such factors is the voltage of each secondary battery. For example, the specific protection device can prevent the secondary battery from overcharging or over discharging through the voltage between both ends of each secondary battery, and can perform a balancing function to reduce the charging state deviation between the secondary batteries.

Since it is very important and important to sense the voltage of each secondary battery included in the battery pack in performing a specific function of the protection device included in the battery pack, Most of the configuration for detecting the voltage of the battery is applied. Typical voltage sensing structures are wire type and PCB type.

The wire type is connected to the electrode portion of the secondary battery by a clip or the like. Such a wire type is excellent in assembling property, but the cost of a part is increased by adding a wire part. Also, since the sensing unit to be fastened to the upper and lower ends of the secondary battery stack body is connected by wires, the secondary battery stack body is elongated in the longitudinal direction, thereby increasing the unit price.

The PCB type is connected by welding the electrode part of the secondary battery and the bus bar. These PCB types reduce product cost by eliminating wire parts. However, there is a risk that the welds may fall off due to vibration or impact. As a result, when the module is assembled or an external force (impact condition or the like) is applied, the welded portion may be damaged. In the case of application to a battery pack such as an automobile or the like, vibration often occurs. Particularly, breakage frequently occurs from both ends of the welded portion, and countermeasures are required.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a battery module to which a structure capable of preventing breakage of an electrode lead of a secondary battery and a weld between a bus bar is applied .

Another object of the present invention is to provide a protection structure for protecting an electrode lead of a secondary battery and a welding portion between bus bars so as to be applicable to such a battery module.

According to an aspect of the present invention, there is provided a battery module comprising: a plurality of secondary batteries having electrode leads; And 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, wherein the electrode lead and the bus bar are welded to each other, Further comprising a protective structure for bonding the bar.

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

The electrode lead may be formed with a bent portion, and the bus bar may be welded to two electrode leads that are folded over each other. At this time, the folded portions of the two overlapping electrode leads may be bent in different directions.

In a preferred embodiment, the protective structure includes a top cover surrounding the top surface of the weld, and a side cover extending from both sides of the top cover to wrap both sides and bottom of the electrode lead and the bus bar. The top cover part and the side cover part may be integrally formed. The electrode lead is bent from both sides of the bus bar and overlapped on the bus bar to form the welding part. The top cover part is formed along the welding part, and the side cover part surrounds the bus bar and tightens the electrode lead around the welding part. Lt; / RTI >

Here, a bending portion may be formed at an opposite end of each of the side covers, and the electrode lead and the bus bar may be installed on the respective bending portions. The bending portion may be parallel to the upper surface cover portion so as to support the bus bar in face-to-face contact. Each of the side covers may have a circular or arc shape. It is preferable that the protective structure is resiliently deformed and elastically supported on both the upper surface of the welded portion and the bottom surface of the electrode lead and the bus bar.

The protection structure may be made of an insulating material, and may be a snap fit method to couple the electrode lead to the bus bar.

For example, the protection structure may include a top cover portion surrounding the upper surface of the weld portion, and a side cover portion formed at both ends of the top cover portion so as to hook the electrode lead and the bus bar.

According to another aspect of the present invention, there is provided a protection structure for protecting a welded portion of a secondary battery by welding over an electrode lead of a secondary battery and a bus bar to prevent welding between the electrode lead and the bus bar, .

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

The present invention also provides a battery module manufacturing method as described above. In this method, an electrode lead of a neighboring secondary battery is bent and overlapped and brought into surface contact with a bus bar, and the welded portion is formed by laser welding the overlapped electrode lead and the bus bar. Then, the protective structure according to the present invention is fastened onto the welded portion.

According to the present invention, a protection structure capable of increasing the fastening force between the bus bar and the electrode lead on the welding portion between the electrode lead and the bus bar is provided.

Such a protection structure prevents lifting between the bus bar and the electrode lead. In the present invention, the electrode lead and the bus bar around the welded portion are coupled to each other to prevent the breakage of the welded portion, thereby effectively preventing the fracture propagation mechanism.

Accordingly, the welded portion between the bus bar and the electrode lead is well maintained, and stable operation can be achieved without damaging the welded portion even in a vibration environment when the module is assembled or used afterwards, thereby performing necessary work such as voltage sensing smoothly.

In particular, since the protective structure of the present invention can be added onto the welded portion by a simple structure and fastening method, a sensing structure, a module, and a pack structure for sensing a voltage of the secondary battery are not complicated, Can be performed more easily.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
1 is a perspective view schematically showing a part of a battery module according to an embodiment of the present invention.
2 is a schematic cross-sectional view for explaining a laser welding configuration of an electrode lead and a bus bar in the structure of FIG.
FIG. 3 illustrates a state in which a protection structure according to an embodiment of the present invention is applied to the battery module of FIG.
FIG. 4 is a schematic view showing a side view of an electrode lead and a bus bar in order to explain the protection structure of FIG. 3 in detail.
5 is a side view of the protective structure before engagement.
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.

BRIEF DESCRIPTION OF THE DRAWINGS The objects and advantages of the present invention will be understood by the following description and will be more clearly understood by means of the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a perspective view schematically showing a part of a battery module according to an embodiment of the present invention. For purposes of illustration and description, only a portion of a battery module with a voltage sensing structure coupled to the secondary battery stack is shown. 2 is a schematic cross-sectional view illustrating a laser welding structure of an electrode lead and a bus bar according to an embodiment of the present invention. The battery module of FIG. 1 has a cross section parallel to the bottom surface along the stacking direction of the secondary battery. For ease of illustration and explanation, structures supporting each component are omitted and only basic components are shown.

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

The PCB, the sensing block 10, the bus bar 20 and the like have a voltage sensing structure, and a well-known conventional voltage sensing structure may be used. The PCB can be electrically connected to the bus bar 20 by coupling the other end of the bus bar 20 to one side of the printed circuit board as a printed circuit board for signal transmission. Here, the other end of the bus bar 20 means the opposite end of the bus bar 20 which is in contact with the electrode leads 30, 40. [ In order to connect the other end of the bus bar 20 to the PCB 20, a hole may be formed in the PCB. By inserting the end of the bus bar 20 into the hole of the PCB, Lt; / RTI >

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

The sensing block 10 may be configured to cover at least a portion of the PCB. At this time, the sensing block 10 may be provided with an opening for exposing the output pin provided on the PCB to the outside.

The voltage sensing structure is only required to be capable of being connected to the secondary battery stack 15 to sense the voltage of the secondary battery 5 provided in the secondary battery stack 15, But is not limited to. For example, a PCB may contain more connectors. The connector transfers voltage information sensed by the bus bar 20 to other components outside the secondary battery stack 15. For example, the connector can transmit voltage information sensed by the BMS provided in the battery pack. To this end, the connector is provided with a path which is electrically connected to the other end of the bus bar 20 to transmit a voltage sensed by the bus bar 20 to an external device, And connection terminals to be connected to the components.

The secondary battery laminate 15 is an aggregate of the secondary batteries 5 having a plurality of secondary batteries 5 and can be a known secondary battery laminate well known in the art. The secondary battery stack body 15 is only required to be able to constitute the battery module 100 by being connected to the voltage sensing structure and is not necessarily limited to the configuration shown in Fig. 1 or Fig.

The secondary battery laminate 15 may include a plurality of pouch-type secondary batteries as the secondary batteries 5, and the plurality of pouch-type secondary batteries may be arranged in one direction, for example, The surface can be stacked along the transverse direction with the surface perpendicular to the floor.

Each of the pouch type secondary batteries may have an electrode lead, and the electrode lead includes the anode lead 30 and the cathode lead 40 as shown in the figure. As shown in the figure, when the secondary batteries 5 are stacked side by side, the negative electrode lead 30 and the positive electrode lead 40 are connected to each other An example in which the secondary battery stack body 15 is constituted so as to be alternately arranged has been described. Here, each of the electrode leads 30, 40 is formed in a plate shape and protrudes to the outside of the pouch exterior member. And then bent to be bent as shown in the drawing for welding with the bus bar 20.

On the other hand, the secondary battery stack body 15 may be provided with a stacking frame for stacking a plurality of pouch type secondary batteries. Such a frame for lamination is a component used for laminating secondary batteries, which can hold the secondary batteries to prevent the secondary batteries from flowing, and can stack mutually, thereby guiding the assembling of the secondary batteries. Such a lamination frame may be replaced with various other terms such as a cartridge, and may be configured in the form of a rectangular ring with an empty central portion. In this case, four corners of the stacking frame may be located on the outer peripheral portion of the secondary battery.

2, the electrode leads 30 and 40 protrude from the secondary battery 5, and the ends of the electrode leads 30 and 40 are bent to the left or right to provide a flat vertical contact surface. The electrode leads 30 and 40 may be bent in different directions so that the bent portions of the electrode leads 30 and 40 having different polarities may overlap each other in the neighboring secondary batteries 5. [ For example, in the embodiment of FIG. 2, the negative electrode lead 30 is formed in a right bent shape, and the positive electrode lead 40 is formed in a left bent shape so that the bent portions are overlapped with each other have. Then, the bus bars 20 are brought into contact with the vertical contact surfaces 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 shape that is overlapped in the left and right direction. 2, when the bus bar 20 and the electrode leads 30, 40 are exposed to the outside, the bus bar 20 and the electrode leads 30, Can be welded to each other and the welded portion 50 can be formed along the longitudinal direction of the bus bar 20 as shown in Fig.

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 innermost and the bent portion of the negative electrode lead 30 of the left secondary battery 5 And the two electrode leads 30 and 40 where the bending portions are overlapped with each other are welded to the bus bar 20 by positioning the bending portion of the positive electrode lead 40 of the right secondary battery 5 thereon. That is, the electrode leads 30 and 40 are bent from both sides of the bus bar 20 and are overlapped on the bus bar 20 to form the welded portion 50.

Particularly, since a plurality of secondary batteries 5 are laminated on the secondary battery laminate 15, the coupling structure of the bus bar 20 and the electrode leads 30 and 40 is also formed as shown in FIG. 1, There may be multiple. The bus bar 20 is a component for sensing the voltage of the secondary battery 5 in direct contact with the electrode leads 30 and 40 of the secondary battery 5, It can be made of conductive material.

The battery module 100 according to the present invention is mounted on the structure shown in Fig. 1, that is, on the welded portions 50 of the electrode leads 30, 40 and the bus bar 20, the electrode leads 30, And a protective structure (200) for joining the first electrode (20).

FIG. 3 is a view illustrating a case where a protection structure 200 according to an embodiment of the present invention is applied to the battery module 100 of FIG. 1 for a single weld. 4 is a schematic view showing the electrode leads 30 and 40 and the side surface of the bus bar 20 for explaining the protective structure 200 of FIG. 5 is a side view of the protective structure 200 before it is fastened.

3 to 5, in order to prevent breakage of the electrode leads 30, 40 and the bus bar 20 from the welded portion 50 when the module is assembled and an external force (impact condition, etc.) The protection structure 200 is added to the battery module 100. Breakage of the welded portion 50 usually starts from the base material adjacent to the welded portion 50 when an external force is applied in the direction in which lifting between the bus bar 20 and the electrode leads 30 and 40 takes place in the vicinity of the welded portion 50.

In the present invention, the focus is on maintaining the adhesion between the bus bar 20 and the electrode leads 30 and 40 in order to effectively block the breakage propagation mechanism. To this end, the present invention provides a protective structure 200 capable of increasing the fastening force between the bus bar 20 and the electrode leads 30 and 40 on the bus bar 20 and the welded portion 50 of the electrode leads 30 and 40 do.

The protective structure 200 is installed so as to simply surround the welded overlapped electrode leads 30 and 40 and the outer circumferential surface of the bus bar 20. Such a protective structure 200 may be non-conductive, i.e., an insulating material. The protective structure 200 is formed of a material having elasticity to some extent, which is not easily damaged due to its mechanical rigidity and durability.

The protection structure 200 includes an upper cover 210 surrounding the upper surface of the weld 50 and electrode leads 30 and 40 and a bus bar 210 at both ends of the upper cover 210. [ 20 and the side cover portion 220 that surrounds the bottom surface. The top cover 210 and the side cover 220 may be integrally formed.

Since the electrode leads 30 and 40 bent over the bus bar 20 are overlapped with each other to form the welded portions 50, the electrode leads 50 are formed on both sides of the welded portion 50, which are elongated along the longitudinal direction of the bus bar 20 30, and 40 are positioned. The top cover 210 is formed along the shape of the weld 50 and the side cover 220 is formed below the welded portion 50 where the bent electrode leads 30 and 40 are not located The electrode leads 30 and 40 and the side surface and the bottom surface of the bus bar 20 are surrounded and welded around the welded portion 50.

Since the one protection structure 200 is installed not only in the vicinity of the welded portion 50 but also around the electrode leads 30 and 40 around the welded portion 50 and the bus bar 20, So that the electrode leads 30 and 40 and the bus bar 20 are kept in close contact with each other without lifting. As a result, the fastening force between the electrode leads 30 and 40 and the bus bar 20 can be strengthened and the welding portion 50 can be protected.

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

The protective structure 200 covers the both side surfaces and the bottom surface of the bus bars 20 and the electrode leads 30 and 40 in a state where the both side cover portions 220 are stretched or opened on the welded portion 50, The side cover 220 can be fastened by releasing the side cover 220. The shape of the circle or arc helps relieve the stress caused by the deformation of the side cover 220 and is also advantageous for restoring the original shape.

The distance d between the end of the side cover 220 and the top cover 210 is smaller than the sum of the thicknesses of the electrode leads 30 and 40 and the thickness of the bus bar 20 as shown in FIG. 4, when the protective structure 200 is fastened, the end of the side lid 220 and the top lid 210 are separated from each other by the end of the side lid 220, The upper cover 210 covers the upper and lower surfaces of the electrode leads 30 and 40 and the electrode leads 30 and 40 in the upper surface of the electrode leads 30 and 40, 40 and the bus bar 20 so as to be elastically supported. When the protective structure 200 is fastened to the electrode leads 30 and 40 and the bus bar 20, the ends of the side lid 220 and the upper lid 210, which are spaced apart from each other, The electrode leads 30 and 40 and the bus bar 20 are pressed against both sides of the laminated structure to be elastically supported. The force to return the end portions of the side lid portion 220 and the top lid portion 210 toward each other is the force pressing the bus bars 20 between the laminated electrode leads 30, to be. Thus, lifting between the electrode leads 30, 40 and the bus bar 20 is prevented. As a result, damage to the welded portion 50 from the periphery of the welded portion 50 due to lifting between the members can be prevented through the protective structure 200 that can adhere to the welded portion 50 as well as the peripheral portion thereof.

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

The protective structure 200 'also includes a top cover 210 surrounding the upper surface of the weld 50 and a pair of electrode leads 30 and 40 extending from both sides of the top cover 210, And a side cover 220 surrounding the side and bottom surfaces.

The electrode leads 30 and 40 and the bus bar 20 are mounted on the respective bending portions 230. The bending portions 230 are formed on the end portions of the side covers 220 facing each other, Can be installed. The reason for providing the bending part 230 in this way is that the bottom surface of the bus bar 20 is surrounded only by the side cover part 220. Due to the weight of the electrode leads 30 and 40 and the bus bar 20, The bending part 230 may be bent at the end of each side cover part 220 so that the bending part 230 may be bent at the end of each side cover part 220. In this case, Since the bending portion 230 primarily supports the weight load, the phenomenon that the side covers 220 are opened due to the dispersion of the load can be minimized.

In FIG. 6, the bending portion 230 is bent inward. However, the bending portion 230 may be designed to have an inside as well as an outwardly directed structure for a proper load distribution effect. As shown in the drawing, if the bending portion 230 is formed to be parallel to the top surface cover 210 so that the bending portion 230 can support the bus bar 20 in a surface contact manner, do. The bending part 230 may be bent several times as necessary to form a double or triple superposed structure.

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

Snap-pit fastening structure among the assembling means is the most suitable fastening method especially for assembling plastic parts. This method is to mold the interlocking shape so that other parts can be attached. Such a snap fit arrangement is classified into a cantilever snap fit, an annular snap fit, and a torsional snap fit. In general, a cantilever snap fit The structure is heavily used. The cantilever type snap fit structure has a structure in which a hook or a bead is provided at a tip end of a protrusion extending from a basic wall of a component so that a component coupled with the component is fastened.

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

The protection structure 200 " shown in Fig. 7 connects the electrode leads 30 and 40 and the bus bar 20 in a snap-fit manner, and can be a cantilever type snap fit structure in particular. For example, the protective structure 200 " has an upper surface cover portion 210 " and side surface cover portions 220 " The top cover 210 '' is applied to the laminated structure of the electrode leads 30 and 40 and the bus bar 20 and the side cover part 220 'is formed on the side of the laminated structure of the electrode leads 30 and 40 and the bus bar 20 Quot;) to sandwich the electrode leads 30 and 40 and the bus bar 20 tightly.

The protection structure proposed in the present invention is formed by connecting the electrode leads 30 and 40 of the secondary battery to the welding portion 50 between the bus bar 20 and protecting the welding portion 50 and protecting the electrode lead 30, and 40 and the bus bar 20 are coupled to each other so as to prevent interlocking.

Since the protective structure according to the present invention closely contacts the welded portion between the bus bar and the electrode lead and the peripheral portion thereof, the welded portion is well maintained, and stable operation is ensured without damaging the welded portion in a vibration environment during module assembly or subsequent use. Therefore, it is possible to smoothly perform necessary operations such as voltage sensing without failures.

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

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

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

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

Next, the electrode leads 30 and 40 are overlapped with each other, and the bus bar 20 is brought into surface contact with the overlapping portion of the bent portions (S120).

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

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

Then, the protective structure 200, 200 'or 200 "according to the present invention is fastened onto the welded portion 50 (S140).

Since the protection structure 200, 200 'or 200 " can be added on the welded portion 50 by a simple structure and fastening method, the sensing structure, the module and the pack structure for sensing the voltage of the secondary battery are simple, The assembling process of connecting to the secondary battery can be performed more easily.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

In the present specification, terms indicating upward, downward, leftward, and rightward directions are used, but these terms are for convenience of explanation only, and may vary depending on the position of the object or the position of the observer. Lt; / RTI >

5: secondary battery 10: sensing block
15: secondary battery laminate 20: bus bar
30, 40: electrode lead 50: welded portion
100: Battery module 200, 200 ', 200 ": Protective structure
210, 210 ": top cover part 220, 220 ": side cover part
230: bending portion

Claims (20)

A secondary battery laminate comprising a plurality of secondary batteries each having an electrode lead laminated thereon; And
And 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,
Further comprising a protection structure for coupling the electrode lead and the bus bar onto a welded portion of the electrode lead and the bus bar. The battery module according to claim 1, wherein the bus bar is welded to the electrode lead by laser welding. The battery module according to claim 1, wherein the electrode leads are formed with bent portions, and the bus bars are welded with two electrode leads, wherein the bent portions are overlapped with each other. The battery module according to claim 3, wherein the bent portions of the two electrode leads overlap each other. [6] The apparatus of claim 3, wherein the protective structure comprises: a top cover portion surrounding the upper surface of the weld portion;
And a side cover part extending from both sides of the top cover part and covering both the side surfaces and the bottom surface of the electrode lead and the bus bar which are overlapped with each other. The battery module according to claim 5, wherein the top cover part and the side cover part are integrally formed. 6. The plasma display panel of claim 5, wherein the electrode leads are bent from both sides of the bus bar and overlap the bus bars to form the welds, the top lid is formed along the welds, And the battery module is fastened while wrapping the bus bar. The battery module according to claim 5, wherein a bending portion is formed at an opposite end of each of the side covers, and the electrode lead and the bus bar are installed on the bending portions. The battery module according to claim 8, wherein the bending portion is parallel to the top surface cover so as to support the bus bar in face contact. The battery module according to claim 5, wherein each of the side covers has a circular or arc shape. The battery module according to claim 5, wherein the protective structure is resiliently deformed and elastically supported on both the upper surface of the welded portion and the bottom surface of the electrode lead and the bus bar. The battery module according to claim 1, wherein the protection structure is made of an insulating material. 2. The battery module of claim 1, wherein the protection structure couples the electrode lead and the bus bar in a snap-fit manner. 14. The plasma display apparatus of claim 13, wherein the protection structure includes a top cover portion surrounding the upper surface of the weld portion, and a side cover portion formed in a shape of a hook at both ends of the top cover portion to sandwich the side surfaces and the bottom surface of the electrode lead and the bus bar. Battery module. The protection structure according to any one of claims 1 to 3, wherein the electrode lead is coupled to the bus bar by welding the electrode lead of the secondary battery to protect the welding portion and the electrode lead around the welding portion. [16] The apparatus of claim 15, wherein the protective structure comprises: a top cover part surrounding the upper surface of the weld part;
And a side cover portion extending from both sides of the top cover portion and covering the electrode leads and both sides and the bottom surface of the bus bar. 17. The protection structure of claim 16, wherein a bending portion is formed at an opposite end of each of the side covers, and the electrode lead and the bus bar are mounted on the bending portions. 17. The protective structure of claim 16, wherein each of the side covers has a circular or arcuate shape. 16. The protective structure of claim 15, wherein the protective structure couples the electrode lead and the bus bar in a snap-fit manner. [20] The apparatus of claim 19, wherein the protection structure includes a top cover portion surrounding the upper surface of the weld portion, and a side cover portion formed at both ends of the top cover portion so as to sandwich the electrode leads and the bus bar between the side and bottom surfaces thereof Protection structure.

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