KR20140125704A - Connecting component with insulating layer for a secondary battery, and Secondary battery module and pack comprising the same - Google Patents

Abstract

A connecting component for a secondary battery according to the present invention is installed on a path of a current flowing through the secondary battery to electrically connect components in the secondary battery with each other and comprises: a first metal plate; a second metal plate positioned to be apart from the first metal plate with a gap between them; a soldering bridge which has a melting point lower than those of the first and second metal plates and fills in the gap; and an insulation layer which is formed on at least one side of both sides of the first and second metal plates to cover a region where the soldering bridge is formed. According to the invention, when an excessive current flows through the connecting component for a secondary battery, the region, where the soldering bridge is formed, is broken to quickly block the flow of the excessive current and also prevent secondary damage such as a short-circuiting due to sparks generated when components are broken.

Description

[0001] The present invention relates to a connecting part for a secondary battery having an insulating layer, a secondary battery module including the connecting part, and a secondary battery pack,

The present invention relates to a connecting part for a secondary battery having an insulating layer and a secondary battery module and a secondary battery pack including the connecting part. More particularly, the present invention relates to a connecting part for a secondary battery having an improved overcurrent shutoff function, And a secondary battery pack.

As the use of portable electric appliances such as video cameras, portable phones, and portable PCs is being activated, the importance of secondary batteries, which are mainly used as driving power sources, is increasing.

Unlike a primary battery, which can not be charged normally, a secondary battery capable of charging and discharging is active in the development of advanced fields such as a digital camera, a cellular phone, a laptop computer, a power tool, an electric bicycle, an electric vehicle, a hybrid vehicle, Research is underway.

In particular, the lithium secondary battery has a higher energy density per unit weight and can be rapidly charged as compared with other secondary batteries such as lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries and nickel-zinc batteries. It is progressing.

The lithium secondary battery has an operating voltage of 3.6 V or higher and can be used as a power source for portable electronic devices, or a plurality of batteries can be connected in series or in parallel to a high output electric vehicle, a hybrid vehicle, a power tool, an electric bicycle, Is used.

The lithium secondary battery has a working voltage three times higher than that of a nickel-cadmium battery or a nickel-metal hydride battery, and has an excellent energy density per unit weight, and is rapidly used.

The lithium secondary battery can be classified into a lithium ion battery using a liquid electrolyte and a lithium ion polymer battery using a polymer solid electrolyte depending on the type of electrolyte. The lithium ion polymer battery can be divided into a fully solid lithium ion polymer battery containing no electrolytic solution and a lithium ion polymer battery using a gel polymer electrolyte containing an electrolyte depending on the kind of polymer solid electrolyte.

In the case of a lithium ion battery using a liquid electrolyte, it is usually used in a form in which a cylinder or a rectangular metal can is used as a container and welded and sealed. Since the can type secondary battery using such a metal can as a container is fixed in shape, there is a disadvantage that it restricts the design of an electrical product using the metal can as a power source, and it is difficult to reduce the volume. Accordingly, a pouch type secondary battery in which an electrode assembly and an electrolyte are sealed in a film pouch packaging material has been developed and used.

However, when the lithium secondary battery is overheated, there is a danger of explosion and it is an important task to secure safety. Overheating of a lithium secondary battery occurs for various reasons, for example, a case where an overcurrent flows beyond a limit through a lithium secondary battery. When the overcurrent flows, the internal temperature of the battery rises rapidly because the lithium secondary battery generates heat by joule heat. Also, the rapid rise of the temperature causes a decomposition reaction of the electrolytic solution and causes a thermal runaway, which eventually leads to the explosion of the battery. The overcurrent is a phenomenon in which a metal object penetrates a lithium secondary battery or the insulation between an anode and a cathode is destroyed by shrinkage of a separator interposed between an anode and a cathode or a rush current Is applied to the battery.

Therefore, the lithium secondary battery is used in combination with a protection circuit to protect the battery from an abnormal situation such as the occurrence of an overcurrent, and the protection circuit is provided with a fuse element for irreversibly disconnecting a line through which charging or discharging current flows when an over- .

1 is a circuit diagram for explaining an arrangement structure and an operation mechanism of a fuse element in a structure of a protection circuit coupled to a lithium secondary battery.

As shown in the figure, the protection circuit includes a fuse element 1 for protecting the secondary battery when an overcurrent occurs, a sense resistor 2 for sensing an overcurrent, and a fuse element 1 for monitoring the occurrence of an overcurrent, And a switch (4) for switching the flow of an operating current into the fuse element (1).

The fuse element 1 is installed in a main line connected to the outermost terminal of the cell assembly B. The main line refers to a wiring through which charging current or discharging current flows. In the figure, the fuse element 1 is shown mounted on a high potential line (Pack +).

The fuse element 1 is a three-terminal element part, two terminals are connected to a main line through which a charging or discharging current flows, and one terminal is connected to the switch 4. And a fuse 1a connected in series with the main line and carpetted at a specific temperature, and a resistor 1b for applying heat to the fuse 1a.

 The microcontroller 3 periodically detects the voltage across the sense resistor 2 and monitors whether an overcurrent is generated. When it is determined that an overcurrent is generated, the microcontroller 3 turns the switch 4 on. Then, a current flowing in the main line is bypassed to the fuse element 1 and applied to the resistor 1b. Thus, the joule heat generated in the resistor 1b is conducted to the fuse 1a to raise the temperature of the fuse 1a. When the temperature of the fuse 1a rises to the fusing temperature, the fuse 1a is fused, The line is irreversibly disconnected. When the main line is disconnected, the overcurrent does not flow any more, so that the problem caused by the overcurrent can be solved.

However, the above-described conventional techniques have various problems. That is, if a failure occurs in the microcontroller 3, the switch 4 is not turned on even when an overcurrent is generated. In this case, since the current does not flow into the resistor 1b of the fuse element 1, there is a problem that the fuse element 1 does not operate. Further, a space for arranging the fuse element 1 in the protection circuit is separately required, and a program algorithm for controlling the operation of the fuse element 1 must be loaded in the microcontroller 3. Therefore, the space efficiency of the protection circuit is lowered and the load of the microcontroller 3 is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has a structure capable of being quickly broken against an overcurrent, has a characteristic of being resistant to physical impact and has excellent insulating property, And to provide a connecting part which does not allow the connecting part.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-mentioned problems, and other technical subjects not mentioned above can be understood by those skilled in the art from the description of the invention described below.

According to an aspect of the present invention, there is provided a connecting part for a secondary battery, the connecting part being provided on a path of a current flowing in the secondary battery and electrically connecting parts constituting the secondary battery. A second metal plate spaced apart from the first metal plate by a gap therebetween; A soldering bridge having a lower melting point than the first and second metal plates, the gap filling the gap; And an insulating layer formed on at least one of both surfaces of the first metal plate and the second metal plate and covering an area where the soldering bridge is formed.

Wherein the first metal plate has a first protrusion raised from a central portion in the thickness direction of one end portion and the second metal plate is formed by protruding from a central portion in the thickness direction of one end portion and a second protrusion .

The soldering bridge may be made of a lead-free alloy material containing tin and copper.

Based on the total weight of the lead-free alloy, the content of tin may be 80 wt% to 98 wt%, and the content of copper may be in a range of 2 wt% to 20 wt%.

The lead-free alloy may further contain at least one additional metal selected from the group consisting of nickel, zinc and silver.

The content of the additional metal may be in the range of 0.01 wt% to 10 wt% based on the total weight of the lead-free alloy.

The soldering bridge may have a melting point of 100 ° C to 250 ° C.

The insulating layer may be formed outside the gap.

The surfaces of the first and second metal plates and the soldering bridge may be coplanar.

The insulating layer may cover the surface of the metal plate and the surface of the soldering bridge at the same time.

The insulating layer may be formed inside the gap.

The surfaces of the first and second metal plates and the surface of the insulating layer may be coplanar.

The insulating layer may be made of at least one material selected from the group consisting of a ceramic material and an insulating material including a reinforcing resin.

According to another aspect of the present invention, there is provided a battery module including at least one battery cell, a module case accommodating the battery cell, an external terminal protruding outside the module case, And the connecting part for the secondary battery is applied as a connecting part provided on the path of the current flowing in the battery module.

And the connecting part for the secondary battery may be applied to the bus bar.

The battery module may further include a lead terminal connected to the external terminal, and the connecting part for the secondary battery may be applied as the lead terminal.

According to another aspect of the present invention, there is provided a battery pack comprising at least one battery cell, a module case accommodating the battery cell, And a bus bar connecting the battery cell and the external terminal, and a connecting part for the secondary battery is applied as a connecting part installed on a path of a current flowing in the battery pack .

The battery pack may further include an interconnection bar for connecting adjacent battery modules, and the connecting part for the secondary battery may be applied to the interconnection bar.

And the connecting part for the secondary battery may be applied to the bus bar.

The battery pack may further include a lead terminal connected to an external terminal of the battery pack, and the connecting part for the secondary battery may be applied as the lead terminal.

According to an aspect of the present invention, when an overcurrent flows through a connecting part for a secondary battery, a flow of an overcurrent can be rapidly blocked through a break of a region where a soldering bridge is formed.

According to another aspect of the present invention, a size and a component of a soldering material layer are appropriately adjusted, so that a connecting part for a secondary battery can have a relatively small resistance value, a high strength, and an excellent ductility while having fast breaking performance.

According to another aspect of the present invention, by providing the insulating layer, it is possible to prevent secondary damage such as short-circuiting caused by sparking when the connecting part for a secondary battery is broken.

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 circuit diagram for explaining an arrangement structure and an operation mechanism of a fuse element in a structure of a protection circuit coupled to a lithium secondary battery.
2 is a partial perspective view showing a connecting part for a secondary battery according to an embodiment of the present invention.
3 is a cross-sectional view showing the connecting part for a secondary battery shown in Fig.
4 and 5 are sectional views showing a modification of the connecting part for a secondary battery shown in Fig.
6 is a cross-sectional view showing a connecting part for a secondary battery according to another embodiment of the present invention.
7 is a cross-sectional view showing a modified example of the connecting part for a secondary battery shown in Fig.
8 and 9 are plan views illustrating a battery module according to an embodiment of the present invention.
10 to 12 are plan views showing a battery pack according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, 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 this specification and the configurations shown in the drawings are merely 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.

2 to 5, a connecting part for a secondary battery according to an embodiment of the present invention will be described.

FIG. 2 is a partial perspective view showing a connecting part for a secondary battery according to an embodiment of the present invention, and FIG. 3 is a sectional view showing the connecting part for a secondary battery shown in FIG. 4 and 5 are sectional views showing a modified example of the connecting part for a secondary battery shown in Fig.

2 to 5, a connecting part 10 for a secondary battery according to an embodiment of the present invention is installed on a path of a current flowing in a secondary battery, and functions to electrically connect parts constituting the secondary battery And includes a first metal plate 11, a second metal plate 12, a soldering bridge 13, and an insulating layer 14.

The first metal plate 11 and the second metal plate 12 are arranged in a plane on the same plane with a gap therebetween as a thin plate metal.

The first metal plate 11 has a first protrusion 11a protruding in a direction substantially perpendicular to a thickness direction center portion of one end portion thereof. Likewise, the second metal plate 12 has a second protrusion 12a formed in a direction substantially perpendicular to the thickness direction center of the one end of the second metal plate 12. The second protrusion 12a has a first protrusion 11a ).

The height H and the width W of the protrusions 11a and 12a affect the characteristics such as the electrical conductivity of the connecting part 10 for the secondary battery 10, safety against breakage (ease of breaking), and tensile strength.

For example, the width of the region where the alloy bridge 13 is formed, that is, the width of the junction region A (meaning the left / right length of the region A in FIG. 3) As the height H increases, the electrical conductivity of the component is improved while the safety and the tensile strength of the component are deteriorated. Similarly, when the width of the junction region A is fixed to a constant value, the electrical conductivity of the component decreases as the width W increases, but the stability and the tensile strength of the overcurrent tend to be excellent.

When the distance between the pair of protrusions 11a and 12a is fixed to be constant by varying the viewpoints, the electrical conductivity of the component decreases as the height H increases, while the stability of the overcurrent and the tensile strength Is improved. Similarly, when the distance between the pair of protrusions 11a and 12a is fixed to a constant value, the electrical conductivity of the component is improved as the width W increases, while the safety and tensile strength of the overcurrent tend to decrease .

This is because the metal constituting the metal plates 11 and 12 has better electrical conductivity than the alloy constituting the soldering bridge 13, but has a melting point much higher and a lower ductility. Therefore, by appropriately adjusting the height H and the width W of the protrusions 11a and 12a, it is possible to obtain the connecting part 10 for a secondary battery, which has excellent physical properties and can be quickly broken when an overcurrent flows.

The metal plates 11 and 12 may be made of a material such as copper coated with copper (Cu), aluminum (Al), or nickel (Ni). However, The present invention is not limited to materials, and various conductive metal materials can be applied.

The kind of the material may vary depending on the material of the parts to be combined with the metal plates 11 and 12. That is, the material of the metal plates 11 and 12 is made of the same material as that of the parts to be joined, which may be advantageous in terms of improved weldability and minimization of contact resistance. It goes without saying that the first metal plate 11 and the second metal plate 12 may be made of different metal materials depending on the material of the parts to be joined.

The soldering bridge 13 is made of an alloy material having a lower melting point than the metal plates 11 and 12 and is joined to the metal plates 11 and 12 while filling gaps formed between the metal plates 11 and 12 . The surface of the soldering bridge 13 is connected to the first metal plate 11 and the second metal plate 12 so that the soldering bridge 13 can be rapidly melted when an overcurrent flows in the secondary battery connecting part 10. [ It is preferable to form the same plane.

The alloy forming the soldering bridge 13 has a melting point of about 100 ° C to 250 ° C which is lower than the melting point of the metal plates 11 and 12 and contains tin (Sn) and copper (Cu) It is made of a lead-free alloy containing no harmful lead (Pb).

The melting point range of the alloy constituting the soldering bridge 13 is set in consideration of the level of the overcurrent to be cut. If the melting point of the alloy is lower than 100 ° C, the alloy can be melted even when a normal current flows through the secondary battery to which the connecting part 10 for secondary battery is applied. If the melting point of the alloy is higher than 250 ° C, melting of the alloy can not be performed rapidly and the overcurrent can not be effectively blocked.

Among the components of the alloy, tin affects the melting point and tensile strength characteristics of the alloy. The content of tin is adjusted to be in the range of about 80 wt% or more, preferably 85 wt% to 98 wt% such that the alloy has good tensile strength characteristics with a melting point in the range of about 100 캜 to 250 캜. The copper functions to improve the electrical conductivity of the alloy. The copper content is adjusted in the range of about 2 wt% to about 20 wt%, preferably about 4 wt% to about 15 wt%. Here, the wt% is a unit based on the total weight of the alloy forming the soldering bridge 13 (hereinafter the same).

The tensile strength of the alloy constituting the soldering bridge 13 can be improved by adjusting the content of tin and copper so as to have an appropriate range as described above and also the tensile strength of the connecting component 10 for a secondary battery by the soldering bridge 13 can be improved, Can be suppressed within a few percent.

The soldering bridge 13 may further include a metal having good electrical conductivity such as nickel (Ni), silver (Ag), and zinc (Zn) in addition to tin and copper in order to have improved physical properties. The content of the additional alloy component is preferably about 0.01 wt% to 10 wt% with respect to the total weight of the soldering bridge 13.

As described above, the secondary battery connecting part 10 has a double structure in which a metal having a relatively good conductivity and an alloy having a relatively low melting point are combined, so that the secondary battery connecting part 10 can have both excellent conductivity and quick breaking property against an overcurrent .

The connecting part 10 for a secondary battery includes protrusions 11a and 12a formed by elevating the metal plates 11 and 12 from the center in the thickness direction so that they are used as relatively thick parts such as a bus bar or an interbus bar Even if it has sufficient fusing effect.

That is, there is a surface which is difficult to be completely broken by fusing as the thickness of the connecting part 10 for a secondary battery increases. The height H and the width W of the projections 11a and 12a are appropriately adjusted, It is possible to maximize the resistance value within the allowable range within the range of A to minimize the sacrifice of other properties (tensile strength, overall electric conductivity of the component, etc.), and to have a sufficient fusing effect.

The insulating layer 14 is made of at least one material selected from the group consisting of a ceramic material and an insulating material including a reinforcing resin. The insulating layer 14 is formed on at least one surface (FIG. 3) And covers the junction area A where the soldering bridges 13 are formed. That is, the insulating layer 14 is formed on the outside of the gap to simultaneously cover the surfaces of the metal plates 11 and 12 and the surface of the soldering bridge 13.

The insulating layer 14 may be formed over at least one of both surfaces of the metal plates 11 and 12 (see FIGS. 3 and 4), but may be formed only at a part of the metal plate 11 and 12 (see FIG. 5).

On the other hand, the insulating layer 4 is formed by spraying a slurry containing ceramic particles and binder particles onto the surface of a connecting part composed of the metal plates 11 and 12 and the soldering bridge 13 Or a method of dipping a connecting part in the slurry, or the like. However, the method of forming the insulating layer 14 is merely an example, and the present invention is not limited thereto.

The insulating layer 14 formed on at least one of the upper and lower surfaces of the metal plates 11 and 12 and covering the bonding region A may be formed when the connecting part 10 for a secondary battery is broken It is possible to prevent the secondary damage caused by the spark.

That is, a spark may occur when the connecting part 10 for a secondary battery is broken around the bonding area A, such peripheral parts may be damaged due to the spark, and the molten alloy material If it splashes around these parts, a short circuit may occur.

Therefore, when the insulating layer 14 is formed so as to cover the bonding area A where the soldering bridges 13 are formed, it is possible to prevent such sparks from splashing directly on peripheral parts or preventing molten alloy material from splashing on peripheral parts have.

In addition, the insulating layer 14 may be formed of metal plates 11 and 12 spaced apart from each other along the longitudinal direction (the left / right direction of the paper according to FIGS. 3 to 5) The mechanical strength of the secondary battery connecting part 10 can be improved by more firmly connecting the opposite end portions.

As described above, the connecting part 10 for a secondary battery according to an embodiment of the present invention connects the metal plates 11 and 12 with a soldering bridge 13 made of a low melting point alloy, Layer 14, it is possible to safely protect the secondary battery from an overcurrent caused by a short circuit or the like.

That is, the secondary battery connecting part 10 is quickly broken due to melting of the soldering bridge 13 at the time of occurrence of an overcurrent, so that it is possible not only to cut off the overcurrent but also to prevent the secondary damage that may occur due to the breakage It is possible to secure safety in use of the secondary battery.

Next, referring to Figs. 6 and 7, a connecting part 20 for a secondary battery according to another embodiment of the present invention will be described.

FIG. 6 is a cross-sectional view showing a connecting part for a secondary battery according to another embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a modification example of the connecting part for a secondary battery shown in FIG.

The connecting part 20 for a secondary battery according to another embodiment of the present invention is different from the connecting part 20 for a secondary battery according to the previous embodiment in that the insulating layer 15 is formed in the gap between the metal plates 11 and 12 And the other components are substantially the same. Therefore, in describing the connecting part 20 for a secondary battery according to another embodiment of the present invention, the formation position of the insulating layer 15 will be mainly described, and a repetitive description of the matters overlapping with those of the previous embodiment It will be omitted.

6 and 7, the connecting part 20 for a secondary battery according to another embodiment of the present invention is disposed inside the gap formed between the metal plates 11 and 12, Layer (15).

That is, the insulating layer 15 is not formed on the surface of the parts composed of the metal plates 11 and 12 and the soldering bridge 13, but is formed on the surfaces of the metal plates 11 and 12, And is connected to the soldering bridge (13).

In this case, the surface of the insulating layer 15 and the surfaces of the metal plates 11 and 12 may be flush with each other.

When the insulating layer 15 is located on the inner side of the gap formed between the metal plates 11 and 12, the connecting parts 20 for the secondary battery 20 ) Can be further improved.

Next, a battery module M according to an embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG.

8 and 9 are plan views illustrating a battery module according to an embodiment of the present invention.

8 and 9, a battery module M according to an embodiment of the present invention includes at least one battery cell (not shown), a module case C that accommodates the battery cell, An external terminal 30 protruding outwardly, and a bus bar 40 connecting between the battery cell and the external terminal 30.

The connecting parts 10 and 20 for a secondary battery according to the present invention are applied to at least one of the connecting parts provided on the path of the current flowing in the battery module M. [

That is, the connecting parts 10 and 20 can be applied, for example, as a bus bar 40 installed in the battery module M (see FIG. 8).

The battery module M may further include a lead terminal 60 connected to the external terminal 30 so that the connecting parts 10 and 20 may be applied as the lead terminal 60 9).

Next, a battery pack P according to an embodiment of the present invention will be described with reference to FIGS. 10 to 12. FIG.

10 to 12 are plan views showing a battery pack according to an embodiment of the present invention.

10 to 12, a battery pack P according to an embodiment of the present invention is implemented by connecting a plurality of battery modules M described above, and between adjacent battery modules M, 50). That is, the interconnecting bar 50 may electrically connect between the battery modules M by, for example, connecting the external terminals 30 of the adjacent battery modules M.

The battery pack P is connected to at least one of the connecting parts provided on the path of the current flowing in the battery pack P in the same manner as the battery module M described above, ) Is applied.

That is, the connecting parts 10 and 20 can be applied, for example, as a bus bar 40 and / or an interconnection bar 50 and / or a lead terminal 60 provided in the battery pack P will be.

As described above, the battery module (M) and the battery pack (P) according to the present invention have a structure in which the connecting parts (10, 20) for a secondary battery according to the present invention are applied to connecting parts provided on a current path The overcurrent can be quickly and safely blocked.

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 to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

10,20: Connecting part for secondary battery
11: first metal plate 11a: first protrusion
12: second metal plate 12a: second protrusion
13: soldering bridge 14,15: insulating layer
M: Battery module P: Battery pack
C: Module case 30: External terminal
40: Bus bar 50: Interconnecting bar
60: Lead terminal

Claims (20)

A connecting part for a secondary battery which is provided on a path of a current flowing in a secondary battery and electrically connects parts constituting the secondary battery,
A first metal plate;
A second metal plate spaced apart from the first metal plate by a gap therebetween;
A soldering bridge having a lower melting point than the first and second metal plates, the gap filling the gap; And
And an insulating layer formed on at least one of both surfaces of the first metal plate and the second metal plate and covering an area where the soldering bridge is formed. The method according to claim 1,
Wherein the first metal plate has a first projection formed by being raised from a central portion in the thickness direction of one end portion,
Wherein the second metal plate is formed by protruding from a central portion in the thickness direction of one end portion and has a second protrusion opposed to the first protrusion portion. The method according to claim 1,
The soldering bridge includes:
And a lead-free alloy material containing tin and copper. The method of claim 3,
Wherein a content of the tin is 80 wt% to 98 wt%, and a content of the copper is 2 wt% to 20 wt% based on the total weight of the lead-free alloy. The method of claim 3,
The lead-
Nickel, zinc, and silver. 7. The connecting part for a secondary battery according to claim 1, further comprising at least one additional metal selected from the group consisting of nickel, zinc, and silver. 6. The method of claim 5,
The content of the additional metal,
Wherein the total weight of the lead-free alloy is 0.01 wt% to 10 wt% based on the total weight of the lead-free alloy. The method according to claim 1,
The soldering bridge includes:
And has a melting point of 100 ° C to 250 ° C. The method according to claim 1,
Wherein the insulating layer
Wherein the connecting part is formed outside the gap. 9. The method of claim 8,
And the surfaces of the first and second metal plates and the soldering bridge are flush with each other. 10. The method of claim 9,
Wherein the insulating layer
And simultaneously covers the surface of the metal plate and the surface of the soldering bridge. The method according to claim 1,
Wherein the insulating layer
Wherein the connecting portion is formed inside the gap. 12. The method of claim 11,
Wherein the surfaces of the first metal plate and the second metal plate and the surface of the insulating layer are flush with each other. The method according to claim 1,
Wherein the insulating layer
And at least one material selected from the group consisting of a ceramic material and an insulating material including a reinforcing resin. 1. A battery module comprising at least one battery cell, a module case accommodating the battery cell, an external terminal protruding outside the module case, and a bus bar connecting between the battery cell and an external terminal,
Wherein the connecting part for a secondary battery according to any one of claims 1 to 13 is applied as a connecting part provided on a path of a current flowing in the battery module. 15. The method of claim 14,
Wherein the connecting part for the secondary battery is applied to the bus bar. 15. The method of claim 14,
And a lead terminal connected to the external terminal,
And a connecting part for the secondary battery is applied as the lead terminal. A battery pack comprising a plurality of battery modules including at least one battery cell, a module case accommodating the battery cell, an external terminal protruding outside the module case, and a bus bar connecting the battery cell and an external terminal. In this case,
Wherein a connecting part for a secondary battery according to any one of claims 1 to 13 is applied as a connecting part provided on a path of a current flowing in the battery pack. 18. The method of claim 17,
Further comprising: an interconnecting bar connecting adjacent battery modules,
Wherein the connecting part for the secondary battery is applied to the interconnection bar. 18. The method of claim 17,
Wherein the connecting part for the secondary battery is applied to the bus bar. 18. The method of claim 17,
And a lead terminal connected to an external terminal of the battery pack,
And the connecting part for the secondary battery is applied as the lead terminal.

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