KR102280596B1 - High current protection element for secondary battery and battery pack including that - Google Patents

Abstract

The present invention relates to a high current protection device for a secondary battery and a battery pack including the same, and the high current protection device for a secondary battery of the present invention includes: an insulating substrate; a first heating element connection electrode and a second heating element connection electrode disposed on the insulating substrate; two or more heating elements installed on the first heating element connection electrode and the second heating element connection electrode and spaced apart from each other; an insulating member disposed on the heating element; a fuse electrode disposed on the insulating member; a fuse that is installed on the fuse electrode and is located above the heating element, has an overlapping region with respect to each of the heating elements, is heated by the heating element and blocks the current path of the secondary battery when melting; and an intermediate electrode having one end connected to one side of the central portion of the fuse element, and the other end being connected to the first heating element connection electrode, wherein the first heating element connection electrode is drawn out to one edge portion of the insulating substrate and the intermediate electrode and a first electrode lead-out portion connected to, wherein the second heating element connection electrode is drawn out to the other edge portion of the insulating substrate, is drawn out to have a wider width than the first electrode lead-out portion, and is connected to any one of the external terminals Two electrode lead-out parts are provided.
According to the large current protection device for a secondary battery of the present invention, a plurality of divided heating elements are disposed on an insulating substrate, and the fuse is disposed on the top of the heating element through an insulating member, but both sides of the long side of the fuse are heated by each of the heating elements By arranging to have overlapping regions, it can be used for applications with high rated current by ensuring rapid melting against overcurrent and overvoltage even when the volume of the fuse is large. It can be attracted and focused by the sieve electrode, so it has the effect of fundamentally blocking the short circuit caused by the scattering of the melt or the breakdown of the insulation by the high current.

Description

A high current protection device for a secondary battery and a battery pack including the same {HIGH CURRENT PROTECTION ELEMENT FOR SECONDARY BATTERY AND BATTERY PACK INCLUDING THAT}

The present invention relates to a large current protection device for a secondary battery and a battery pack including the same, and more particularly, even when the volume of the fuse is large, it is melted at high speed against overcurrent and overvoltage, and the energization phenomenon by the melt of the fuse after cutting is prevented. It relates to a high current protection device for a secondary battery capable of reliably blocking the occurrence and a battery pack including the same.

2. Description of the Related Art In general, a secondary battery is a rechargeable power storage device and is used in various industrial fields such as a mobile terminal such as a smart phone, an electric vehicle, and an ESS. A secondary battery mainly used is a lithium-ion battery using lithium-cobalt oxide as one electrode and graphite as the other electrode. Lithium-ion batteries have advantages of high energy density, low volume, and stability compared to nickel-cadmium or nickel-hydrogen batteries. However, as the number of charge/discharge increases, the storage capacity decreases and the lifespan decreases. Recently, other alternative electrodes such as carbon nanotubes (CNTs) have been developed.

A secondary battery represented by a lithium-ion battery may generate heat due to overcharging or overdischarging, so a protection circuit is used. However, despite the use of such a protection circuit, recently, accidents in which a battery pack of a secondary battery ignites frequently occur. For example, a switch such as a FET used in a lithium-ion battery pack is short-circuited to cause an overcurrent to flow or a surge voltage is applied to cause an overvoltage to flow, generating high heat, and such abnormal overheating can cause fire or explosion of the battery pack. cause accidents

In order to prevent this, a protection element that is fused by overcurrent and overvoltage is used in parallel with a protection circuit inside the secondary battery battery pack. The conventional protection device performs a protection operation against the overcurrent in such a way that when an overcurrent is applied between the two electrodes, the fusible is melted to block the current path between the two electrodes. In addition, a heating element is used to operate against overvoltage, and when the heating element is heated by the overvoltage, the fusible is melted to block the current path.

However, in the conventional protection device, the volume of the fuse increases as the rated current increases, and when the volume of the fuse increases, the fusing operation time for overvoltage is delayed.

In order to solve this problem, Korean Patent Registration No. 10-2043051 "Protection Element" proposes a protection element having a structure in which a first heating element and a second heating element are stacked below and above a fuse element, respectively. According to the prior art, when an overvoltage occurs, the first heating element and the second heating element are heated below and above the fuse element, respectively, to enable rapid melting for a high rating.

However, the protection device of the prior literature has a problem in that it is structurally difficult to connect the electrode to the second heating element positioned above the fuse element. For this reason, referring to the embodiments illustrated in the drawings of the prior literature, the second heating element 25 is disposed to be embedded in the upper insulating cover, and is connected to the electrodes in the insulating cover. Therefore, it is difficult for the heat generated by the second heating element to be transmitted to the fusing element, and problems such as damage or insulation breakdown of the insulating cover by the heat of the second heating element occur.

Republic of Korea Patent Registration No. 10-2043051

The present invention ensures rapid melting against overcurrent and overvoltage even when the volume of the fuse is large by disposing a plurality of heating elements to be electrically insulated below the fuse element, but each heating element has at least an overlapping region with the fuse element A large current protection device for secondary batteries that can fundamentally block a short circuit caused by a melt or an arcing phenomenon caused by a high current by partitioning the heating part of the fuse so that the fuse is attracted to and focused on the fuse electrode when it is melted; and An object of the present invention is to provide a battery pack including the same.

A high current protection device for a secondary battery according to an embodiment of the present invention includes an insulating substrate; a heating element connection electrode disposed on the insulating substrate; two or more heating elements installed on the heating element connection electrode and spaced apart from each other; an insulating member disposed on the heating element;

a fuse electrode disposed on the insulating member; and a fuse that is installed on the fuse electrode and is located above the heating element, has an overlapping region with respect to each of the heating elements, is heated by the heating element, and blocks the current path of the secondary battery when melting.

In the high current protection device for a secondary battery according to another embodiment of the present invention, each of the heating elements is connected in parallel with respect to a pair of heating element connection electrodes with long sides arranged side by side on the insulating substrate in a predetermined direction, and the fuse element is the The long side portion is disposed in a direction orthogonal to the long side portion of the heating element.

In the large current protection device for a secondary battery according to another embodiment of the present invention, an intermediate electrode is connected to one side of the central portion of the fuse element, and the intermediate electrode is commonly connected to any one of the heating element connection electrodes.

In a large current protection device for a secondary battery according to another embodiment of the present invention, the fuse electrode and the intermediate electrode extend to the side and bottom surfaces of the insulating substrate to form an extension, and the extension is plated with gold or platinum. do.

In the high current protection device for a secondary battery according to another embodiment of the present invention, a caster portion in which a concave portion and a protrusion are continuous is formed on an edge portion of the insulating substrate, and the concave portion of the castellation portion is a polygon when viewed from the top inward. Alternatively, it is formed to be concave in a semi-circular shape, and the bottom surface of the insulating cover for accommodating the insulating substrate is provided with a recessed portion.

In the large current protection device for a secondary battery according to another embodiment of the present invention, the main portion of the caster is formed on the fuse electrode and the intermediate electrode.

In the large current protection device for a secondary battery according to another embodiment of the present invention, the volume of the melt of the fuse body focused on the fuse electrode and the intermediate electrode is at least 1.1 times greater than the volume of the fuse body.

A battery pack according to an embodiment of the present invention includes at least one battery cell; and a protection device connected to the charging/discharging path of the battery cell and selectively blocking the charging/discharging path, wherein the protection device includes: an insulating substrate; a heating element connection electrode disposed on the insulating substrate; two or more heating elements installed on the heating element connection electrode and spaced apart from each other; an insulating member disposed on the heating element; a fuse electrode disposed on the insulating member; and a fuse that is installed on the fuse electrode and is located above the heating element, has an overlapping region with respect to each of the heating elements, is heated by the heating element, and blocks the current path of the secondary battery when melting.

In the battery pack according to another embodiment of the present invention, long sides of each of the heating elements are arranged side by side on the insulating substrate in a predetermined direction and are connected in parallel with respect to a pair of the heating element connection electrodes, and the fuse element has a long side portion thereof. It is disposed in a direction orthogonal to the long side of the heating element.

In the battery pack according to another embodiment of the present invention, an intermediate electrode is connected to one side of the central portion of the fuse element, and the intermediate electrode is commonly connected to any one of the heating element connection electrodes.

In the battery pack according to another embodiment of the present invention, the fuse electrode and the intermediate electrode extend to the side surface and the bottom surface of the insulating substrate to form an extension portion, and the extension portion is plated with gold or platinum.

In the battery pack according to another embodiment of the present invention, the edge portion of the insulating substrate is formed with a concave portion and a continuous protrusion portion, and the concave portion is a polygonal or semicircular shape when viewed from the top inward. The bottom surface of the insulating cover for accommodating the insulating substrate is provided with a recessed portion formed in a concave shape.

In the battery pack according to another embodiment of the present invention, the main portion of the casterization portion is formed on the fuse electrode and the intermediate electrode.

In the battery pack according to another embodiment of the present invention, the volume of the melt of the fuse body focused on the fuse electrode and the intermediate electrode is 1.1 times or more larger than the volume of the fuse body.

According to the large current protection device for a secondary battery of the present invention, a plurality of divided heating elements are disposed on an insulating substrate, and the fuse is disposed on the top of the heating element through an insulating member, but both sides of the long side of the fuse are heated by each of the heating elements By arranging to have overlapping regions, it can be used for applications with high rated current by ensuring rapid melting against overcurrent and overvoltage even when the volume of the fuse is large. Since it can be attracted and focused by the sieve electrode, there is an effect that can fundamentally block the phenomenon of short circuit caused by scattering of the melt or the breakdown of insulation by high current.

In addition, according to the present invention, the fuse electrode and the intermediate electrode extend to the side and bottom surfaces of the insulating substrate to form an extension, and the extension is plated with gold or platinum to improve the wettability of the fuse to the melt. This has the effect of more reliably preventing short circuits and dielectric breakdown caused by scattering of the melt.

In addition, according to the present invention, by forming a castle-shaped castellation portion on the edge portion of the insulating substrate, the scattering of the fusible material is guided along the main portion of the casterization portion to the depression of the lower insulating cover, thereby short-circuiting by the scattering. The effect of preventing phenomena or insulation breakdown can be maximized.

1 is a perspective view showing an example in which a large current protection device for a secondary battery according to the present invention is packaged;
Figure 2 is an exploded perspective view of Figure 1;
3 is an exploded perspective view illustrating a large current protection device for a secondary battery according to the present invention;
4 is an equivalent circuit diagram illustrating a fusing operation by overcurrent in the present invention;
5 is an equivalent circuit diagram illustrating the fusing operation by overvoltage in the present invention;
6 is a perspective view illustrating a laminated state of the fuse body before melting in the present invention;
7 is a perspective view illustrating a state in which the fuse body is brought into contact with the electrode after melting in the present invention;
8 is a perspective view showing the fuse part in FIG. 7 separated;
9 is a perspective view illustrating an example in which a caster is formed on an edge portion of an insulating substrate according to another embodiment of the present invention; and
10 is a perspective view illustrating an example in which a caster is formed on an edge portion of an insulating substrate according to another embodiment of the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Throughout the specification, the same reference numerals are given to parts having similar structures and operations. In addition, the drawings attached to the present invention are for convenience of description, and the shape and relative scale thereof may be exaggerated or omitted.

In describing the embodiments in detail, overlapping descriptions or descriptions of obvious techniques in the art are omitted. In addition, when a certain part "includes" other components in the following description, it means that other components may be further included in addition to the described components unless otherwise stated.

In addition, terms such as "~ unit", "~ group", and "~ module" described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can In addition, when it is said that a certain part is electrically connected to another part, this includes not only a case in which it is directly connected, but also a case in which it is connected through another configuration in the middle.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.

1 is a perspective view showing an example in which a large current protection device for a secondary battery according to the present invention is packaged.

Referring to FIG. 1 , the high current protection device for a secondary battery according to the present invention may be provided in the form of a package. The first external terminal 110 is withdrawn from one side of the protection device package 100 , and the second external terminal 120 is withdrawn from the other side of the protective device package 100 . And the third external terminal 130 is drawn out toward the front. Each of the first external terminal 110 , the second external terminal 120 , and the third external terminal 130 has a fastening hole to be bolted to the battery terminal and the protection circuit terminal inside the battery pack.

As in the embodiments to be described later, the first external terminal 110 and the second external terminal 120 are terminals connected to both ends of the fuse 260 inside the package, and constitute a terminal of the circuit for overcurrent fusing. In addition, the first external terminal 110 and the third external terminal 130 are at both ends of the first heating element 232 and the second heating element 234 inside the package, in detail, the first heating element connection electrode 222, respectively. and a terminal connected to the second heating element connection electrode 226 , and constitutes a terminal of a circuit for overvoltage fusing.

On the other hand, although the illustrated example illustrates that the protection device package 100 is configured in a three-terminal type, the technical idea of the present invention is not limited thereto and may be applied to a two-terminal type or a three-terminal or more type.

FIG. 2 is an exploded perspective view of FIG. 1 ; Referring to FIG. 2 , the protection device package 100 has a structure in which an upper insulating cover 140 and a lower insulating cover 150 are assembled, and a protection device is disposed between the upper insulating cover 140 and the lower insulating cover 150 . (200) is installed.

A coupling protrusion 142 protrudes inside the corner of the upper insulating cover 140, and a coupling recess 152 is formed inside the corner of the lower insulating cover 150 to correspond to the position of the coupling protrusion 142, The upper insulating cover 140 and the lower insulating cover 150 may be firmly assembled without a gap. The protection element 200 inside the insulating cover will be described in detail with reference to the exploded perspective view of FIG. 3 .

On the other hand, on the inside of the lower insulating cover 150, a depression 154 recessed to the bottom is formed. As described below with reference to FIGS. 9 and 10 , the depression 154 acts as a space for confining the melt when the melt of the fuse 260 flows downward through the casterization part. In addition, although not depicted in FIG. 2 , an upwardly concave space portion is also formed on the inner side of the upper insulating cover 140 to correspond to the depression 154 . As will be described later by this space portion, the melt of the fuse element 260 can be focused to a sufficient thickness when it is focused on the fuse element electrodes 252 and 254 and the intermediate electrode 256 .

3 is an exploded perspective view illustrating a large current protection device for a secondary battery according to the present invention.

Referring to FIG. 3 , an insulating substrate 210 is disposed below the insulating cover. The insulating substrate 210 is, for example, a ceramic substrate. A first heating element connection electrode 222 and a second heating element connection electrode 226 are disposed on both upper sides of the insulating substrate 210 . The exploded perspective view of FIG. 3 is a view in which the protection element 200 illustrated in FIG. 2 is rotated 90 degrees to facilitate understanding of the invention, and the first heating element connection electrode 222 is an intermediate electrode 256 as a medium. It is connected to the fuse body 260 . In the illustrated example, the first electrode lead-out portion 224 drawn from the first heating element connection electrode 222 to the edge portion of the insulating substrate 210 is connected to the intermediate electrode 256 and is connected to the intermediate connection point of the fuse element 260 . do. As for the second heating element connection electrode 226 , a wider second electrode lead-out part 228 is drawn out to the edge part of the insulating substrate 210 and is directly connected to the third external terminal 130 .

As shown on the first heating element connection electrode 222 and the second heating element connection electrode 226 , the first heating element 232 and the second heating element 234 are connected. Each of the first heating element 232 and the second heating element 234 is made of a conductor having high thermal conductivity, and long sides thereof are arranged side by side in a predetermined direction and are connected in parallel with respect to the connecting electrodes of the two heating elements. That is, when an overvoltage is applied between the two heating element connection electrodes, the first heating element 232 and the second heating element 234 are heated by resistance heating.

An insulating member 240 is disposed on the first heating element 232 and the second heating element 234 to cover the two heating elements, and the first fuse electrode 252 and the second fuse element are disposed on the insulating member 240 . An electrode 254 , and an intermediate electrode 256 are disposed. In addition, the fuse element 260 is connected to the upper portions of the first fuse electrode 252 , the second fuse electrode 254 , and the intermediate electrode 256 to be electrically connected to the respective electrodes.

The first fuse electrode 252 and the second fuse electrode 254 are electrodes for attracting and focusing the melt of the fuse body 260 when the fuse body 260 is melted, and are spaced apart to have a sufficient insulation distance. do. As illustrated, the first fuse electrode 252 and the second fuse electrode 254 are disposed in a direction perpendicular to the two heating element connection electrodes and are electrically insulated from the heating element connection electrode and the heating elements.

The intermediate electrode 256 is an electrode drawn out from the middle of the fuse 260 and connects the fuse 260 and the first electrode lead 224 of the first heating element connection electrode 222 to configure a protection circuit to be described later. electrode for

4 is an equivalent circuit diagram illustrating the fusing operation by overcurrent in the present invention, and FIG. 5 is an equivalent circuit diagram illustrating the fusing operation by overvoltage in the present invention. Referring to FIGS. 4 and 5 , a large current for a secondary battery according to the present invention An operation characteristic in which the protection element is fused by overcurrent and overvoltage will be described.

4 and 5, two series switching FETs 322 and 324 are connected in series between the positive terminal of the battery cell 310 and the positive output terminal of the battery pack, and a primary protection IC for overcurrent protection ( 320) is installed. One parallel switching FET 332 and a secondary protection IC 330 for overvoltage protection are installed between the positive terminal and the negative terminal of the battery cell 310 . Although the battery cell 310 is illustrated as a lithium ion secondary battery cell, it is of course possible to replace it with another secondary battery.

As illustrated in FIG. 4 , when an overcurrent flows in the series line in the charging/discharging path of the battery cell 310 , that is, when an overcurrent is applied between the first external terminal 110 and the second external terminal 120 . , the fuse element 260 is fused by the overcurrent. In the circuit of FIG. 4 , the fuse element 260 is exemplified as constituting two fuses, and the fuse element 260 on both sides of the middle electrode 256 is shown as an equivalent circuit, and the Of the positive terminal and the positive terminal of the battery pack, the one through which more current flows (usually the positive terminal of the battery pack) is fused first to block the current path.

As illustrated in FIG. 5 , when an overvoltage is applied to both ends of the battery cell 310 , that is, the third external terminal 130 and the first or second external terminals 110 and 120 of the protection device package 100 . ), the first heating element 232 and the second heating element 234 are simultaneously heated by the overvoltage applied between them, and the fuse element 260 is heated and cut by melting. At this time, not only the fuse element 260 is rapidly fused by the heating of the two heating elements 232 and 234 , but also the fuse element 260 on both sides is fused around the intermediate electrode 256 as shown in the circuit diagram of FIG. dog cracks occur.

6 is a perspective view illustrating a stacked state of fuses before melting in the present invention, FIG. 7 is a perspective view illustrating a state in which fuses are brought into contact with electrodes after melting in the present invention, As a perspective view showing a separated part, FIGS. 7 and 8 illustrate a case in which the fuse body 260 is fused by overvoltage.

6 depicts a steady state before the fuse body 260 is fused. When an overvoltage is applied here as in the circuit diagram of FIG. 5 , both sides of the fuse body 260 are heated and melted by the first heating element 232 and the second heating element 234 , and the melt is the first fuse electrode 252 , the second fuse electrode 254 , and the intermediate electrode 256 may be attracted and focused.

7 shows that the melt of the fuse body 260 is applied to the first fuse electrode 252 , the second fuse electrode 254 , and the intermediate electrode 256 , respectively, the first melt 262 and the second melt 264 . , represents a state focused into the third melt 266 .

Here, the first fuse electrode 252 , the second fuse electrode 254 , and the intermediate electrode 256 extend to the side and bottom surfaces of the insulating substrate 210 to form extension portions, and the extension portions include gold. Alternatively, platinum may be plated. The plated extension portion increases the effect of focusing the first melt 262, the second melt 264, and the third melt 266, and a short circuit phenomenon due to scattering of the melt or a high current is applied to minute cracks. It is possible to more effectively prevent the occurrence of dielectric breakdown such as arcing.

On the other hand, the volume in which the melt of the fuse is focused on the fuse electrodes 252 and 254 and the intermediate electrode 256, that is, the volume of the melt 262, the second melt 264, and the third melt 266 is It can be described as in FIG. 8 .

Preferably, compared to the volume of the fuse body 260 , the volume of the melt of the fuse body focused on the fuse electrode 252 , 254 and the intermediate electrode 256 , ie, the melt 262 , the second melt 264 . , and the third melt 266 is designed to have a volume of 1.1 times or more. And a concave space is formed in the upper inner side of the upper insulating cover 140 so that the melt 262, 264, 266 of the fusible can be focused to a sufficient thickness. Since the fuse body 260 and the melts 262, 264, and 266 of the fuse body have the above volume ratio, it is possible to reliably block the flow of current when the fuse body 260 is melted, and the melts 262, 264, 266) can ensure a cold insulation distance between them.

For example, when the fuse 260 has a size of 8 mm on the short side, 18 mm on the long side, and 0.3 mm on the thickness, its volume will be 43.2 mm 3 . At this time, as depicted in FIG. 8 , the first melt 262a and the second melt 264a on the upper surface of the insulating substrate 210 have a volume of 39.6 mm 3 when designed with a long side of 11 mm, a short side of 3 mm, and a thickness of 0.6 mm, respectively. has The third melt 266a on the upper surface of the insulating substrate 210 has a volume of 2.25 mm 3 when designed with a long side of 2.5 mm, a short side of 1.5 mm, and a thickness of 0.6 mm.

With respect to the side surface of the insulating substrate 210, the first melt 262b, the second melt 264b, and the third melt 266b have a total width of 7.5 mm, a height of 0.54 mm, and a thickness of 0.6 mm. It has a total volume of 2.43mm3 when designed as With respect to the lower surface of the insulating substrate 210, the first melt 262c, the second melt 264c, and the third melt 266c have a total width of 7.5 mm, an extension length of 1.5 mm from the lower surface, and the same thickness It has a total volume of 6.75 mm 3 when designed with a thickness of 0.6 mm.

In the illustrated embodiment, compared to the volume of the fuse body 260 of 43.2 mm 3 , the total volume of the fuse melt is 51.03 mm 3 , which is about 1.18 times larger, so that current interruption can be ensured when the fuse body 260 is melted.

9 is a perspective view showing an example in which a caster is formed on an edge of an insulating substrate according to another embodiment of the present invention, and FIG. 10 is a perspective view showing an example in which a castage is formed on an edge of an insulating substrate according to another embodiment of the present invention. It is a perspective view showing an example formed.

As shown in FIGS. 9 and 10 , in the high current protection device for a secondary battery according to the present invention, a caster portion 270 in which concave portions and protrusions are continuous may be formed on the edge portion of the insulating substrate 210 . When viewed from the top of the lower insulating cover 150, the casterization part 270 may be concave in a semi-circular shape as shown in FIG. 9 or a rectangular shape as shown in FIG. 10 . Of course, it may have other polygonal shapes.

Preferably, the main part of the casterization part 270 is formed on the fuse electrodes 252 and 254 and the intermediate electrode 256 as shown, and the fuse electrodes 252 and 254 and the middle part are also formed on the main part. A side extension of the electrode 256 may be formed. Also, as described above, gold or platinum may be plated on the electrode extension portion of the recessed portion.

In the process of focusing the melt of the fuse element 260 to the fuse element electrodes 252 and 254 and the intermediate electrode 256 , the caster 270 , even if some scattering product exists, the scattering product is transferred to the lower part of the fusible body 260 . It is guided to the recessed part 154 of the insulating cover 150 . Therefore, it is possible to maximize the effect of preventing short circuit or dielectric breakdown caused by scattering of the melt.

Various modifications are possible within the scope of the invention disclosed above without detracting from the basic idea. That is, all of the above embodiments should be interpreted as illustrative and not restrictive. Therefore, the protection scope of the present invention should be determined according to the appended claims, not the above-described embodiments, and if the components defined in the appended claims are substituted with equivalents, it should be considered as belonging to the protection scope of the present invention.

100: protective device package 110: first external terminal
120: second external terminal 130: third external terminal
140: upper insulating cover 142: coupling protrusion
150: lower insulating cover 152: coupling recess
154: depression 200: protection element
210: insulating substrate 222: first heating element connection electrode
224: first electrode lead-out part 226: second heating element connection electrode
228: second electrode lead-out part 232: first heating element
234: second heating element 240: insulating member
252: first fuse electrode 254: second fuse electrode
256: middle electrode 260: fuse body
262: first melt 264: second melt
266: third melt 270: casterization part
310: battery cell 320: primary protection IC
322, 324: series switching FET 330: secondary protection IC
332: parallel switching FET

Claims (14)

insulated substrate;
a first heating element connection electrode and a second heating element connection electrode disposed on the insulating substrate;
two or more heating elements installed on the first heating element connection electrode and the second heating element connection electrode and spaced apart from each other;
an insulating member disposed on the heating element;
a fuse electrode disposed on the insulating member;
a fuse that is installed on the fuse electrode and is located above the heating element, has an overlapping region with respect to each of the heating elements, is heated by the heating element and blocks the current path of the secondary battery when melting; and
One end is connected to one side of the central portion of the fuse element, and the other end is an intermediate electrode connected to the first heating element connection electrode.
includes,
The first heating element connection electrode has a first electrode lead-out portion which is drawn out to one edge portion of the insulating substrate and is connected to the intermediate electrode, and the second heating element connection electrode is drawn out to the other edge portion of the insulating substrate, and the first electrode A large current protection device for a secondary battery having a second electrode lead-out part drawn out to have a wider width than the lead-out part and connected to any one of external terminals.
According to claim 1,
Each of the heating elements has long sides arranged side by side in a predetermined direction on the insulating substrate and connected in parallel to a pair of the first heating element connection electrode and the second heating element connection electrode,
The fuse element is a large current protection device for a secondary battery in which the long side is disposed in a direction perpendicular to the long side of the heating element.
delete According to claim 1,
The fuse electrode and the intermediate electrode extend to the side surface and the bottom surface of the insulating substrate to form an extension, and the extension portion is plated with gold or platinum.
According to claim 1,
An edge portion of the insulating substrate is formed with a concave portion and a continuous protrusion, and the concave portion is formed to be concave in a polygonal or semicircular shape when viewed from the top inward, and the insulation accommodating the insulation substrate A high-current protection device for a secondary battery having a recessed portion formed on the bottom surface of the cover.
6. The method of claim 5,
A large current protection device for a secondary battery formed on the fuse electrode and the intermediate electrode in the main portion of the casterization part.
According to any one of claims 1, 2, 4 to 6,
A large current protection device for a secondary battery, wherein the volume of the melt of the fuse is 1.1 times greater than the volume of the fuse electrode and the intermediate electrode.
at least one battery cell; and
and a protection element connected to the charge/discharge path of the battery cell and selectively block the charge/discharge path;
The protection element is:
insulated substrate;
a first heating element connection electrode and a second heating element connection electrode disposed on the insulating substrate;
two or more heating elements installed on the first heating element connection electrode and the second heating element connection electrode and spaced apart from each other;
an insulating member disposed on the heating element;
a fuse electrode disposed on the insulating member;
a fuse that is installed on the fuse electrode and is located above the heating element, has an overlapping region with respect to each of the heating elements, is heated by the heating element and blocks the current path of the secondary battery when melting; and
One end is connected to one side of the central portion of the fuse element, and the other end is an intermediate electrode connected to the first heating element connection electrode.
includes,
The first heating element connection electrode has a first electrode lead-out portion which is drawn out to one edge portion of the insulating substrate and is connected to the intermediate electrode, and the second heating element connection electrode is drawn out to the other edge portion of the insulating substrate, and the first electrode A battery pack having a second electrode lead-out part drawn out to have a wider width than the lead-out part and connected to any one of external terminals.
9. The method of claim 8,
Each of the heating elements has long sides arranged side by side in a predetermined direction on the insulating substrate and connected in parallel to a pair of the first heating element connection electrode and the second heating element connection electrode,
The fuse element is a battery pack in which a long side thereof is disposed in a direction perpendicular to the long side of the heating element.
delete 9. The method of claim 8,
The fuse electrode and the intermediate electrode extend to a side surface and a bottom surface of the insulating substrate to form an extension portion, and the extension portion is plated with gold or platinum.
9. The method of claim 8,
An edge portion of the insulating substrate is formed with a concave portion and a continuous protrusion, and the concave portion is formed to be concave in a polygonal or semicircular shape when viewed from the top inward, and the insulation accommodating the insulation substrate A battery pack provided with a depression formed in the bottom surface of the cover.
13. The method of claim 12,
The main portion of the casterization part is formed on the fuse electrode and the intermediate electrode.
According to any one of claims 8, 9, 11 to 13,
A battery pack having a volume in which the melt of the fuse body is focused on the fuse electrode and the intermediate electrode is 1.1 times or more larger than the volume of the fuse body.

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