KR20170019862A - Method for Manufacturing Battery Pack Comprising Protect Assembly Having Safety Element for Protection against Overheating - Google Patents

Abstract

The present invention provides a method for manufacturing a battery pack including a plate-shaped battery cell in which an electrode assembly is sealed and then subjected to a sealing treatment to form a sealing surplus portion, and a protection element for preventing overheat of the battery cell,
(a) attaching an insulating tape to an upper surface of a sealing surplus portion of a battery case in which a cathode lead and a cathode lead are respectively formed;
(b) electrically connecting one side of the protection assembly including one or more hot shut-off devices to prevent overheating to one of the positive electrode lead and the negative electrode lead;
(c) binding the protective assembly onto the insulating tape of the sealing surplus portion; And
(d) covering the protective assembly with cover tape so as to fix the seal assembly on the sealant;
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Characterized in that a double-sided adhesive tape is attached to one side of the protective assembly to adhere the protective assembly to the sealant.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a battery pack including an assembly including a protection element for preventing overheating,

The present invention relates to a method of manufacturing a battery pack including an assembly including a protection element for preventing overheating.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices increase, the demand for batteries as energy sources is rapidly increasing. Recently, the use of secondary batteries as a power source for electric vehicles (EV) and hybrid electric vehicles (HEV) In addition, the use area has been expanded for use as a power auxiliary power source through a grid, and accordingly, a lot of researches on a battery that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

In particular, pouch-type batteries are attracting much attention due to their advantages such as small weight, low manufacturing cost and easy shape deformation because aluminum laminate sheets are used as exterior members.

FIG. 1 schematically shows an exploded perspective view showing a general structure of a typical conventional pouch type secondary battery.

1, a pouch type secondary battery 10 includes a stacked electrode assembly 20 having a plurality of electrode tabs 21 and 22 protruding therefrom, two stacked electrode assemblies 20 and 22 connected to the electrode tabs 21 and 22, And a battery case 40 having a structure in which the stacked electrode assembly 20 is received and sealed such that a part of the electrode leads 30 and 31 and a part of the electrode leads 30 and 31 are exposed to the outside.

The battery case 40 includes a lower case 42 including a concave shaped storage portion 41 on which the stacked electrode assembly 20 can be placed and a stacked electrode assembly 20 And an upper case 43 for sealing the upper case 43. The upper case 43 and the lower case 42 are thermally fused with the stacked electrode assembly 20 built therein to form a sealing part (not shown) along the outer surface of the battery case.

On the other hand, such a pouch-type secondary battery generates a large amount of heat in a charge / discharge process. Particularly, since the laminate sheet of the pouch-type battery widely used for the battery module is coated with a polymer material having a low thermal conductivity, it is difficult to effectively cool the temperature of the entire battery cell.

In other words, if the heat of the battery module generated during the charging and discharging process can not be effectively removed, heat accumulation may occur, which may accelerate the deterioration of the battery module and possibly cause ignition or explosion.

Therefore, in the conventional pouch type secondary battery, a protection circuit module is used to prevent overcharging, overdischarge, overcurrent, and the like. Further, in order to increase the temperature detection performance of the secondary battery, a technique in which a resistor element including a positive temperature coefficient is separately installed in the battery case is used.

Here, when the temperature of the secondary battery reaches the preset value, the resistor element cuts off the electrical connection between the electrode lead and the protection circuit module. When the temperature of the secondary battery falls below the set value, the electrical connection between the positive electrode lead and the protection circuit module is restored Function.

In addition, in the prior art, various types of coupling structures have been developed in order to provide a structure including a protection element such as a resistor element on the outer surface of a battery cell.

However, depending on the size and shape of the safety element, the engagement member for attaching to the outer surface of the battery case also needs to be formed in a variety of structures, so that frequent design changes of the engagement member are troublesome according to various safety elements.

In addition, since the safety element must be electrically connected to the electrode lead and the protection circuit module, it is required to design precise dimensions between the two components and to install the components in an accurate position in order to prevent internal short-circuit due to connection failure between the components. However, when the safety element is first electrically connected to the electrode lead and then the safety element is attached to the battery case of the pouch type secondary battery, there is a problem that the set position and error are generated, there was.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments and have found that when a double-sided adhesive tape is attached to one side of a protective assembly in the course of binding a protective assembly onto an insulating tape of a sealing surplus portion, It is not necessary to change the design of the coupling member for the protection assembly due to the change of the other type of safety element and it is possible to fix the protection assembly to the outer surface of the battery case positively to reduce the distance error between the electrode lead and the protection circuit module, It has been found that the efficiency of the process can be increased and the defect rate can be drastically reduced, and the present invention has been accomplished.

According to an aspect of the present invention, there is provided a method of manufacturing a battery pack,

There is provided a method of manufacturing a battery pack including a plate-shaped battery cell in which an electrode assembly is sealed and then a sealing surplus portion is formed, and a protection device for preventing overheat of the battery cell,

(a) attaching an insulating tape to an upper surface of a sealing surplus portion of a battery case in which a cathode lead and a cathode lead are respectively formed;

(b) electrically connecting one side of the protection assembly including one or more hot shut-off devices to prevent overheating to one of the positive electrode lead and the negative electrode lead;

(c) binding the protective assembly onto the insulating tape of the sealing surplus portion; And

(d) covering the protective assembly with cover tape so as to fix the seal assembly on the sealant;

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And a double-sided adhesive tape is attached to one side of the protective assembly to fix the protective assembly to the sealant.

However, the present invention is not necessarily limited to the sequential steps (a) to (d), and the step (c) may be performed before the step (b) And can be included in the scope of the invention.

Accordingly, the method of manufacturing a battery pack according to the present invention is characterized in that a double-sided adhesive tape is attached to one surface of a protective assembly so that the protective assembly is placed on the insulating tape of the sealing surplus portion of the plate- It is possible to fix the protection assembly to the outer surface of the battery case in a proper position to reduce the distance error between the electrode lead and the protection circuit module and to improve the efficiency of the manufacturing process And the defect rate can be drastically reduced.

Further, the protective assembly of the present invention can be fixed to the outer surface of the battery case more firmly and to cover and secure the outer surface of the protection assembly with the cover tape to achieve complete sealing with the outside.

In one specific example, the plate-shaped battery cell may have a structure in which an electrode assembly is sealed in a pouch-shaped battery case of a laminate sheet including a resin layer and a metal layer, and the electrode assembly includes at least one anode, And a separator interposed between the positive electrode and the negative electrode, and may be sealed inside the battery case together with the electrolyte solution.

In addition, the sealing surplus portion may be a sealing part formed by heat sealing sealing of the battery case.

In one specific example, the protection assembly includes a lead coupling portion for electrically connecting the electrode lead and the protection element, an element portion including the protection element, and a connection plate for electrically connecting to the protection circuit module .

In one specific example, the element portion of the protection assembly includes a body of a thin rectangular parallelepiped structure, a strip-shaped lead coupling portion is formed at one end of the body, and a strip- And the plate may be formed extending.

In one specific example, the double-sided pressure-sensitive adhesive tape may have a structure attached to one surface of the element portion between the lid-engaging portion and the connection plate. By limiting the adhesive portion to the element portion, So that an appropriate level of protection function can be performed.

Specifically, the double-sided adhesive tape may be attached in a size corresponding to the width and / or width on the plane of the main body of the protective element. More specifically, the width of the double-sided adhesive tape is 2 mm to 10 mm, The width of the double-sided adhesive tape may be from 5 mm to 35 mm.

In one specific example, the double-sided adhesive tape may be a structure in which an adhesive layer is coated on both sides of a film base of a polymer resin.

On the other hand, when the double-sided tape is added to the lead-inserting portion of the protective assembly to be welded to the electrode lead, thermal deformation or adhesive force of the double-faced tape may be deteriorated due to high heat during welding of the lead-

Therefore, in the manufacturing method according to the present invention, a release sheet including a heat insulating material may be further provided on one side of the double-sided adhesive tape facing the insulating tape of the sealing surplus portion, and the release sheet is welded to the lead- It is possible to prevent the heat from being deformed or the adhesive strength of the double-sided pressure-sensitive adhesive tape from deteriorating.

In one specific example, the film of the polymer resin may be a polycarbonate tape, a nomex tape, a polypropylene tape, a polyethylene tape, or a polyethylene terephthalate (PET) tape.

The protection element may be at least one selected from the group consisting of a positive temperature coefficient element, a fuse, and a thermal cutoff element. More specifically, the protection element may include a TCO element and a PTC Device, or a TCO device.

Here, the TCO device disconnects the electrical connection between the electrode lead and the protection circuit module when the temperature of the battery becomes a predetermined value or more. When the temperature of the battery falls below a predetermined value, the electrical connection between the electrode lead and the protection circuit module is restored .

Further, the connection plate may have a structure that extends vertically from the element portion in a plan view. That is, although the overall shape of the protection assembly may have an 'L' shape or the like, it is not necessarily limited to such a shape, but various shapes can be manufactured depending on the position of the electrode leads and the protection circuit module.

In addition, the protective assembly may be made of a material capable of being deformed by appropriately bending in accordance with the positions of the electrode leads and the protection circuit module. For example, the lead attaching portion or the connection plate may be formed on a plane As shown in Fig.

In one specific example, the lead connecting portion may be connected to the electrode lead by welding, and the electrode lead may be a cathode lead, and the welding may be performed by various methods, for example, but is not limited to, spot welding, laser welding, or ultrasonic welding.

The manufacturing method may further include a step of bending the electrode lead at least once in a state where the lead coupling part is connected to the electrode lead and forming the connection plate so that the connection plate protrudes upward in parallel with the projecting direction of the remaining electrode leads . By using the structure of this protection assembly, the connection plate can be electrically connected to the protection circuit module instead of the lead coupling portion and the welded electrode lead.

In addition, the manufacturing method according to the present invention further includes a step of vertically bending the sealing surplus portion so as to face the one side wall of the electrode assembly receiving portion in a state where the protective assembly is attached to the outer surface of the sealing assembly after the step (d) can do.

According to the above-described structure, the dead space that can be generated due to the empty space on the top surface of the upper portion of the battery cell can be reduced, and the battery can be designed with a larger capacity than the existing volume, have.

The present invention also provides a battery pack characterized by being manufactured by the above manufacturing method.

The present invention also provides a device including the battery pack as a power source. Specifically, the device may be, for example, a cellular phone, a portable computer, a wearable electronic device, a tablet PC, a smart pad, a netbook, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid electric vehicle, a plug- And a power storage device.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, in the method of manufacturing the battery pack according to the present invention, by attaching the double-sided adhesive tape to one surface of the protection assembly, the protection assembly is insulated from the sealing surplus portion of the plate- It is possible to eliminate the necessity of changing the design of the coupling member for the process of binding on the tape and also to fix the protection assembly to the outer surface of the battery case in a proper position to reduce the distance error between the electrode lead and the protection circuit module, And the defect rate can be drastically reduced.

1 is an exploded perspective view showing a general structure of a typical pouch type secondary battery of the related art;
2 is a flowchart illustrating a method of manufacturing a battery pack according to an embodiment of the present invention;
3 is a schematic perspective view of a battery pack according to one embodiment of the present invention;
4 is a schematic perspective view of a plate-shaped battery cell according to an embodiment of the present invention;
Figure 5 is a schematic plan view of a protective assembly in accordance with one embodiment of the present invention;
6 and 7 are schematic plan views showing a part of a battery pack for explaining a method of manufacturing a battery pack according to an embodiment of the present invention;
8 and 9 are schematic plan views showing a part of a battery pack for explaining a method of manufacturing a battery pack according to an embodiment of the present invention;
10 is a schematic cross-sectional view showing a part of a double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention;
11 is a schematic side view of a battery cell having a protection assembly according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 2 is a flow chart showing a method of manufacturing a battery pack according to an embodiment of the present invention. FIG. 3 is a perspective view of a battery pack according to an embodiment of the present invention, 4 schematically shows a perspective view of a battery cell according to an embodiment of the present invention.

2 to 4, a method 600 of manufacturing a battery pack according to the present invention is a method for manufacturing a battery pack in which a plate-shaped battery (not shown) having an electrode assembly (not shown) (600) for manufacturing a battery pack (500) including a cell (110) and a protection element (not shown) for preventing overheat of the battery cell (110). Here, the sealing abutment 112 is an upper sealing portion formed by heat sealing sealing of the battery case 115.

Figure 5 is a schematic top view of a protective assembly in accordance with one embodiment of the present invention.

5, the protection assembly 200 includes a lead coupling part 230 and a protection element 210 for electrically connecting the positive electrode lead 130 and the protection element 210 An element portion 220, and a connection plate 240 for electrically connecting to a protection circuit module (not shown).

The element part 220 of the protection assembly 200 includes a body 222 of a thin rectangular parallelepiped structure and a strip-shaped lead coupling part 230 is formed at one end of the body 222 And a strip-shaped connection plate 240 is formed at the other end of the main body 222.

Further, the connection plate 240 is formed in such a structure that it vertically extends from the element portion 220 on a plane. Thus, the overall shape of the protection assembly 200 is an 'L' shape. Here, the protection element 210 uses a TCO element.

6 and 7 are diagrams schematically showing plan views of a part of a battery pack for explaining a method of manufacturing a battery pack according to an embodiment of the present invention.

2 and 6, the insulating tape 300 is attached to the upper surface of the sealing pad 112 of the battery case 115 in which the positive electrode lead 130 and the negative electrode lead 131 are formed, Perform step (a) 610.

2 and 7, a process of electrically connecting the lead coupling part 230 of the protection assembly 200 including the high temperature protection device 210 for preventing overheating to the cathode lead 130 (b) (620).

At this time, the lead coupling part 230 is connected to the cathode lead 130 by ultrasonic welding.

In addition, a double-sided adhesive tape 310 is attached to one side of the protective assembly 200 to bond the protective assembly 200 to the sealant 112.

The double-sided adhesive tape 310 is attached to one surface of the element unit 220 between the lead coupling unit 230 and the connection plate 240. The double- The protection assembly 200 may be attached to the outer surface of the battery cell 110 while reducing the manufacturing cost, and may perform an appropriate level of protection.

That is, the double-sided adhesive tape 310 is attached at a size corresponding to the width D on the plane of the main body 222 of the protective element 210, and the width D of the double- 10 mm, and the width W of the double-stick adhesive tape 310 is 5 mm to 35 mm.

10 is a schematic cross-sectional view showing a part of a double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention.

10, the double-sided adhesive tape 310 has adhesive layers 311 and 312 coated on both sides of a film base material 314 of a polymer resin, A release sheet 315 including a heat insulating material is attached to one surface of the facing double-sided adhesive tape 310. This release sheet 315 can block the high heat due to the welding of the lead coupling part 230 and the electrode lead, Thereby preventing the adhesive tape 310 from being deteriorated in thermal deformation or adhesive ability.

Further, a heat shielding film was used as the heat insulating material, and a PP (polypropylene) tape was used as a film of the polymer resin.

FIGS. 8 and 9 are schematic diagrams showing a plan view of a part of a battery pack for explaining a method of manufacturing a battery pack according to an embodiment of the present invention.

Referring to FIG. 8 together with FIG. 2, a process (c) 630 of binding the protective assembly 200 onto the insulating tape 300 of the sealant 112 is performed.

10 and 8, after separating the release paper 315 from the double-sided adhesive tape 310 on one side of the protective assembly 200, the double-sided adhesive tape 310 is separated from the insulation on the sealing pad 112 The protection assembly 200 is attached to the upper surface of the tape 300, thereby binding the protection assembly 200 to the battery cell 110.

The cathode lead 130 may be bent at least one time in the state where the lead coupling part 230 is connected to the cathode lead 130 so that the connection plate 240 contacts the remaining cathode lead 130, And is protruded upward in parallel with the protruding direction of the protrusion.

The connection plate 240 can be electrically connected to the protection circuit module (not shown) instead of the lead connection part 230 and the welded positive electrode lead 130 using the structure of the protection assembly 200 .

Referring to FIG. 9 together with FIG. 2, a process (d) (640) is performed in which the protection assembly 200 is entirely covered with the cover tape 310 and is fixed to the seal abutment 112.

The protective assembly 200 of the present invention is thus securely fixed to the outer surface of the battery case 115 and protected by the cover tape 310 by the protective assembly 200 Can be covered and fixed.

FIG. 11 schematically shows a side view of a battery cell in which a protection assembly according to another embodiment of the present invention is installed.

Referring to FIG. 11 together with FIG. 2, a method 600 according to the present invention includes the steps of (d) after step (640), in a state where the protective assembly 200 is stuck to the upper surface of the seal ingot 112, The method further includes a step of vertically bending 650 to face the one side wall 153 of the electrode assembly receiving portion 152.

Accordingly, the dead space that can be generated due to the empty space on the upper surface of the sealing pad 112 at the upper end of the battery cell 110 can be reduced, and the battery can be designed with a larger capacity than the existing volume, .

As described above with reference to the drawings, in the method of manufacturing the battery pack of the present invention, by attaching the double-sided adhesive tape to one side of the protection assembly, the protection assembly is sealed with the sealing surplus of the plate- It is possible to fix the position of the protection assembly on the outer surface of the battery case, thereby reducing the distance error between the electrode leads and the protection circuit module, The efficiency of the manufacturing process can be improved and the defective rate can be drastically reduced.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (21)

There is provided a method of manufacturing a battery pack including a plate-shaped battery cell in which an electrode assembly is sealed and then a sealing surplus portion is formed, and a protection device for preventing overheat of the battery cell,
(a) attaching an insulating tape to an upper surface of a sealing surplus portion of a battery case in which a cathode lead and a cathode lead are respectively formed;
(b) electrically connecting one side of the protection assembly including one or more hot shut-off devices to prevent overheating to one of the positive electrode lead and the negative electrode lead;
(c) binding the protective assembly onto the insulating tape of the sealing surplus portion; And
(d) covering the protective assembly with cover tape so as to fix the seal assembly on the sealant;
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Wherein a double-sided adhesive tape is affixed to one side of the protective assembly to adhere the protective assembly to the sealant. The manufacturing method according to claim 1, wherein the plate-shaped battery cell comprises a structure in which an electrode assembly is sealed in a pouch-shaped battery case of a laminate sheet including a resin layer and a metal layer. The manufacturing method according to claim 2, wherein the electrode assembly includes at least one anode, at least one cathode, and a separator interposed between the anode and the cathode, and is sealed inside the cell case together with the electrolyte. The manufacturing method according to claim 1, wherein the sealing surplus portion is an upper sealing portion formed by heat sealing sealing of the battery case. [2] The apparatus of claim 1, wherein the protection assembly includes a lead coupling portion for electrically connecting the electrode lead and the protection element, an element portion including the protection element, and a connection plate for electrically connecting to the protection circuit module Wherein the method comprises the steps of: [6] The apparatus of claim 5, wherein the element assembly of the protection assembly includes a body having a thin rectangular parallelepiped structure, a strip-shaped lead coupling part extending from one end of the body, Wherein a plate is formed to extend. The manufacturing method according to claim 6, wherein the double-sided adhesive tape is attached to one surface of the element portion between the lid-engaging portion and the connection plate. The manufacturing method according to claim 6, wherein the double-sided adhesive tape is attached at a size corresponding to a width and / or a width on a plane of the main body of the protection element. The manufacturing method according to claim 8, wherein the width of the double-sided adhesive tape is 2 mm to 10 mm, and the width of the double-sided adhesive tape is 5 mm to 35 mm. The manufacturing method according to claim 1, wherein the double-sided adhesive tape is a structure in which an adhesive layer is coated on both sides of a film base of a polymer resin. 11. The double-sided pressure-sensitive adhesive tape according to claim 10, wherein the double-sided pressure-sensitive adhesive tape is provided with a releasing paper including a heat insulating material on one surface thereof facing the insulating tape of the sealing surplus portion, and after releasing the releasing paper after performing the step (b) Way. The method according to claim 10, wherein the polymer resin film is a polycarbonate tape, a nomex tape, a polypropylene tape, a PE (polyethylene) tape, or a PET (polyethylene terephthalate) tape . The method according to claim 1, wherein the protection element is at least one selected from the group consisting of a positive temperature coefficient element, a fuse, and a thermal cutoff element. The manufacturing method according to claim 6, wherein the connection plate extends vertically from the element portion in a plan view. 6. The method of claim 5, wherein the lead coupling portion is connected to the electrode lead by welding. The manufacturing method according to claim 1, wherein the electrode lead is a cathode lead. 17. The method of claim 16, wherein the welding is spot welding, laser welding, or ultrasonic welding. The method of claim 6, further comprising the step of bending the electrode lead at least once in a state where the lead coupling part is connected to the electrode lead, thereby forming a shape in which the connection plate protrudes upward in parallel with the projecting direction of the remaining electrode leads ≪ / RTI > The method according to claim 1, further comprising, after the step (d), further comprising the step of vertically bending the sealing surplus portion so as to face the one side wall of the electrode assembly receiving portion in a state where the protective assembly is bonded to the outer surface of the sealing ingot . A battery pack manufactured by the manufacturing method according to any one of claims 1 to 19. A device comprising the battery pack according to claim 20 as a power source.

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