KR20220065312A - Battery With Improved Coupling Stability and Device Including It - Google Patents

Abstract

The present invention relates to a battery having improved coupling stability between a battery and a device, and a device including the same, and more specifically, to a battery (200) in which an electrode assembly is accommodated in a case (210), wherein a plurality of recesses (220) are formed in an outer surface of the case (210), and a device including the same. According to the battery with improved coupling stability and the device including the same of the present invention, the recesses are formed in the outer surface of the case of the battery, so that a coupling force between the battery and a battery accommodation portion can be increased, thereby improving the coupling stability of the battery.

Description

Battery With Improved Coupling Stability and Device Including It

The present invention relates to a battery and a device including the same, and specifically, to improve stability by increasing bonding force with the device, and has a structure in which a recess is formed on the outer surface of the battery case, and the coupling layer is filled in the recess to ensure bonding stability It relates to an improved battery and a device comprising the same.

As technology development and demand for mobile devices such as smartphones, laptops, and digital cameras increase, technologies related to rechargeable batteries are becoming more active. These batteries are an alternative energy source for fossil fuels that cause air pollutants, and are applied to electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), and energy storage devices (ESSs). is becoming

The battery may be classified into a cylindrical battery, a prismatic battery, a pouch-type battery, etc. according to the shape. Among them, a pouch-type battery that can be stacked with a high degree of integration, has a high energy density per weight, and is easily deformable in shape, is attracting a lot of attention.

1 is an exploded perspective view of a conventional portable device housing a pouch-type battery, FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1, and FIG. 3 is an enlarged view of the battery housing of FIG.

1 to 3 , the portable device includes a rear cover 10 , a battery 20 , an inner frame 30 , and a front cover 40 . The front cover 40 may include a display 41 , and the inner frame 30 may include a receiving part 31 in which the battery 20 can be disposed. The wide surface (X-Y surface) of the battery 20 is positioned to face the bottom surface of the accommodating part 31 , and a fixing part 50 is provided between the wide surface of the battery and the bottom surface of the accommodating part, so that the battery 20 ) and the bottom surface of the receiving part can be combined. The bonding part 50 is configured by laminating an adhesive layer 51 , a base layer 52 and a bonding layer 53 , and the lowermost adhesive layer 51 is positioned to face the bottom surface of the receiving part 31 and the bonding layer 53 ) is located facing the battery. Here, the bonding layer 53 is composed of a double-sided tape.

Meanwhile, in the pouch-type battery, a swelling phenomenon in which the secondary battery expands and contracts due to gas generated during charging and discharging of the battery may occur repeatedly. As such, in order to secure space according to the expansion of the pouch-type battery, a swelling space part 32 is provided between the rear cover 10 positioned on the side and upper surface of the accommodating part except for the bottom surface of the accommodating part 31 coupled with the battery. ) can be formed.

When an external shock is applied to the portable device in which the battery is accommodated, the battery may be detached from the adhesive double-sided tape and may move in the swelling space 32 according to external vibration, shock, or the like. Accordingly, the battery power connection is damaged, which not only affects the operation of the device, but also increases the possibility of the battery ignites or explodes, so there is a serious safety problem.

On the other hand, Patent Document 1 discloses a secondary battery in which a plurality of channel portions are formed by a combination of protrusions and irregularities partially protruding from the surface of the case to improve the circulation structure of air passing between secondary batteries.

Patent Document 2 discloses a case for a secondary battery in which an electrode assembly and an electrolyte are built-in, and the outer surface of the battery case has a structure in which a plurality of discontinuous irregularities having a depth smaller than the thickness of the battery case are formed. Disclosed are a battery case having excellent stability and improved heat dissipation characteristics, and a cylindrical secondary battery including the same.

Both of these Patent Documents 1 and 2 have an uneven structure on the surface of the battery case, but do not disclose a battery capable of improving the bonding stability with the bonding layer of the battery housing and further improving the stability of the portable device. .

Republic of Korea Patent Publication No. 2006-0026601 (2006.03.24) 'Patent Document 1' Republic of Korea Patent Publication No. 2010-0025968 (2010.03.10) 'Patent Document 2'

In the battery and the device including the same according to the present invention for solving the above problems, it is to provide a battery and a device including the same having a structure that can improve the coupling stability of the battery and the device without additional fixing means The purpose.

In addition, in the battery and the device including the same according to the present invention, an object of the present invention is to provide a battery in which a recess is formed on the outer surface of the battery case without modification of the configuration of the existing battery, and a device including the same.

In the battery 200 in which the electrode assembly is accommodated inside the case 210 according to the present invention for achieving this object, a plurality of recesses 220 are formed on the outer surface of the case 210 characterized in that

Also, in the battery according to the present invention, the recess 220 may be formed on one surface of the wide surface (X-Y surface) of the case 210 .

In addition, in the battery according to the present invention, the recess 220 may be in the form of a recess, and the edge of the recessed end may be filleted with a predetermined radius of curvature r.

Also, in the battery according to the present invention, the recess 220 may have a stripe shape.

Also, in the battery according to the present invention, the concave portion 220 may have a shape in which the first concave portion 221 and the second concave portion 222 intersect.

In addition, in the battery according to the present invention, the recess 220 may be formed in a fracture shape.

Also, in the battery according to the present invention, the case 210 may be formed of a laminate sheet in which a resin layer and a metal layer are sequentially stacked.

In addition, in the present invention, it is characterized in that the battery is a portable device disposed in the internal housing (310).

Also, in the portable device according to the present invention, the recessed portion 200 of the battery faces the bottom surface of the accommodating part 310 , and a bonding layer 520 filled in the recessed part 200 on the bottom surface of the accommodating part. This can be located

Also, in the portable device according to the present invention, the bonding layer 530 may be made of a silicon material.

In the present invention, one or two or more non-conflicting configurations among the above configurations may be selected and combined.

As described above, according to the battery with improved bonding stability and the device including the same according to the present invention, a recess is formed on the outer surface of the case of the battery, the bonding strength of the battery and the battery housing unit is improved, and thus the bonding stability of the battery is improved. There are advantages to being able to

In addition, in the battery and the device including the same according to the present invention, since a recess is formed on the outer surface of the battery case, there is an advantage that the coupling stability between the battery and the device can be improved without the need for a separate coupling means.

In addition, in the battery and the device including the same according to the present invention, the configuration of the coupling part of the device can be reduced, so that the volume of the battery can be increased according to the increase of the usable volume of the receiving part, so that the operating time of the device can be extended. There is this.

1 is an exploded perspective view of a portable device housing a conventional pouch-type battery.
FIG. 2 is a cross-sectional view taken along line AA′ in FIG. 1 .
3 is an enlarged view of the battery housing of FIG. 2 .
4 is an exploded perspective view of a portable electronic device according to a preferred embodiment of the present invention.
5 is a cross-sectional view taken along line BB′ in FIG. 4 .
6 is a partially enlarged view of the battery accommodating part of FIG. 5 .
7 is various exemplary cross-sectional views of main parts according to a preferred embodiment of the present invention.
8 is a schematic diagram of a battery case including a main structure according to a preferred embodiment of the present invention.
9 is an enlarged view of a main portion pattern formed in a battery case according to a preferred embodiment of the present invention.

Hereinafter, embodiments in which those of ordinary skill in the art to which the present invention pertains can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, when it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention in explaining the operating principle of the preferred embodiment of the present invention in detail, the detailed description thereof will be omitted.

In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions. Throughout the specification, when it is said that a certain part is connected to another part, it includes not only a case in which it is directly connected, but also a case in which it is indirectly connected with another element interposed therebetween. In addition, the inclusion of any component does not exclude other components unless otherwise stated, but means that other components may be further included.

In addition, descriptions that limit or add elements may be applied to all inventions unless there are special limitations, and are not limited to descriptions of specific inventions.

Also, throughout the description and claims of the present invention, the singular includes the plural unless otherwise noted.

Also, throughout this description and claims, "or" is intended to include "and" unless stated otherwise. Therefore, "comprising A or B" means all three cases including A, including B, or including A and B.

In addition, all numerical ranges include the values at both ends and all intermediate values therebetween, unless expressly stated otherwise.

4 is an exploded perspective view of a portable device according to a preferred embodiment of the present invention, FIG. 5 is a cross-sectional view taken along line B-B′ in FIG. 4 , and FIG. 6 is a partially enlarged view of the battery housing of FIG. 5 .

4 to 6 , the battery 200 according to the present invention is located in the battery receiving unit 310 of the portable device. The portable device includes an internal frame 300 including a battery accommodating part 310 , a rear cover 100 coupled to the internal frame 300 while covering the upper part of the battery accommodating part 310 , and the internal frame 300 . It is configured to include a front cover 400 positioned opposite to the rear cover 100 in the position. The front cover 400 may include a display 410 . A coupling part 500 is provided between the battery 200 and the sea surface of the accommodating part 310 so that the battery 200 can be stably coupled to the accommodating part 310 .

Although the drawings show the portable device having the above configuration, this is only an example and is not particularly limited as long as it is an electronic device accommodating a battery. In the present invention, the portable device includes a smart phone, a tablet personal computer (PC), a mobile phone, a video phone, an e-book reader, a desktop personal computer (PC), and a ramtop PC. (laptop personal computer), netbook computer, workstation, server, personal digital assistant (PDA), portable multimedia player (PMP), MP3 player, mobile medical device, camera, or wearable A wearable device (e.g., smart glasses, head-mounted-device (HMD)), electronic apparel, electronic bracelet, electronic necklace, electronic accessory, smart mirror, or smart watch. watch)), a portable medical device, and may include at least one of navigation.

In addition, the device may be a smart home appliance or an electronic device of a building/structure, and the device according to an embodiment of the present invention is not limited to the above-described devices, and may include a new electronic device according to technological development.

First, the battery 200 will be described. Although not shown in the drawings, the battery 200 includes an electrode assembly, an electrode tab, an electrode lead, and a case 210 .

The positive electrode plate and the negative electrode plate may be configured to face each other. The positive and negative plates are formed as a structure in which an active material slurry is applied to a current collector, and the slurry is typically formed by stirring a granular active material, an auxiliary conductor, a binder, a plasticizer, etc. in a state in which a solvent is added.

The positive plate and the negative plate are configured in a plate shape and are spaced apart so that the plate surfaces face each other. In addition, a separator is interposed between the positive and negative plates to prevent the positive and negative plates from directly contacting each other. Such a separator blocks the positive and negative plates so that they are not short-circuited, but may be provided in a porous structure to allow movement of charges during charging or discharging.

The electrode assembly having the above configuration may be provided in a stack type in which a plurality of positive and negative electrode plates are sequentially stacked, or a winding type in which one positive electrode plate and one negative electrode plate are wound with a separator interposed therebetween. For example, the electrode assembly may have any shape, such as a stack type or a combination of a stack type and a folding type.

On the other hand, it goes without saying that there is no problem even if the electrolyte is replaced with a solid electrolyte or a semi-solid electrolyte in the form of a gel that is intermediate between liquid and solid by adding additives to the solid electrolyte, in addition to the generally used liquid electrolyte.

The electrode tab may be formed to protrude from the positive electrode plate and the negative electrode plate, respectively, and the electrode lead is electrically connected to the electrode tab and exposed to the outside of the case 210 , and serves as an electrode terminal that can be electrically connected to other secondary batteries or external devices. do Of course, it is obvious that the electrode tab may be directly connected to an external device while the electrode lead is omitted.

The electrode assembly as described above is accommodated in the battery case 210 , and a recess 220 to be described later is formed on one outer surface of the case 210 , and a detailed description of the recess 220 will be described later.

Here, the case 210 is a laminate sheet including a resin layer and a metal layer, and in a state in which the electrode assembly and the electrolyte are embedded, the edge region may be heat-sealed and sealed.

In addition, the laminate sheet generally includes a gas barrier layer, a surface protection layer, and a sealant layer. The gas barrier layer secures the mechanical strength of the case, blocks the ingress of gas or moisture from the outside of the secondary battery, and prevents leakage of electrolyte.

In general, the gas barrier layer includes a metal and mainly an aluminum thin film (Al Foil) is used, which is light in weight while securing a predetermined level or more of mechanical strength, Complementing the electrochemical properties of the electrode assembly 200 and the electrolyte and heat dissipation, etc. can be secured.

The surface protective layer is made of a polymer and is located on the outermost layer to protect the secondary battery from friction and collision with the outside, and to electrically insulate the electrode assembly 200 from the outside. Here, the outermost layer refers to a direction opposite to the direction in which the electrode assembly 200 is located, and a direction facing the outside with respect to the gas barrier layer.

For the surface protective layer, a polymer such as nylon resin or polyethylene terephthalate (PET) having abrasion resistance and heat resistance is mainly used. In addition, the surface protective layer may have a single film structure made of any one material, or a composite film structure in which two or more materials are each layered.

The sealant layer is made of a polymer, and is located in the innermost layer and is in direct contact with the electrode assembly. The pouch-type case 210 is manufactured while drawing and forming the laminate sheet having the above-described laminate structure using a punch or the like, and a part thereof is elongated to form an upper receiving portion or a lower receiving portion.

Then, when the electrode assembly is accommodated in the receiving part, the electrolyte is injected. After that, when the upper case and the lower case are brought into contact with each other and thermocompression is performed on the sealing part, the sealant layers are adhered to each other, thereby sealing the battery case.

At this time, since the sealant layer is in direct contact with the electrode assembly, it must have insulation, and since it is also in contact with the electrolyte, it must have corrosion resistance. In addition, since the inside must be completely sealed to block material movement between the inside and the outside, it must have high sealing properties. That is, the sealing portion where the sealant layers are adhered to each other should have excellent thermal bonding strength.

In general, a polyolefin-based resin such as polypropylene (PP) or polyethylene (PE) is mainly used for the sealant layer. Polypropylene (PP) has excellent mechanical properties such as tensile strength, rigidity, surface hardness, abrasion resistance, heat resistance, and chemical properties such as corrosion resistance, and is mainly used for manufacturing sealant layers. Furthermore, it may be composed of Cated Polypropylene or polypropylene-butylene-ethylene terpolymer. In addition, the sealant layer may have a single film structure made of any one material, or a composite film structure in which two or more materials are each layered.

On the other hand, the battery 200 is approximately hexahedron, and may be composed of a pair of facing wide surfaces (X-Y axis surfaces) and two pairs of side surfaces formed while enclosing the periphery.

Here, the lower wide side of the battery 200 is positioned in close contact with the bottom surface of the receiving unit 310 , and between the side of the stored battery 200 and the corresponding side of the receiving unit 310 and the stored battery 200 . ) is spaced apart between the upper wide surface and the rear cover 100 to form a swelling space 320 . This is to secure a space for expansion of the battery due to gas generated inside the battery during repeated charging and discharging.

Next, the coupling unit 500 will be described. The coupling unit 500 includes an adhesive layer 510 and a bonding layer 520 . The adhesive layer 510 is positioned on the bottom surface of the accommodating part 310 and serves to fix the bonding layer 520 positioned on the accommodating part to the accommodating part. Here, the adhesive layer may be an adhesive or a pressure-sensitive adhesive.

In addition, the bonding layer 520 may be a silicone layer having excellent adhesion and flexibility. For example, the bonding layer may be a thermoplastic elastomer resin including an ester-based thermoplastic elastomer, an olefin-based elastomer, a silicone-based elastomer, an acrylic elastomer, or a mixture thereof, but is not limited thereto.

Here, the battery 200 is located on the upper end of the bonding layer 520 , and the bonding layer is filled in the recess 220 of the battery case when the battery is pressed with a predetermined pressure in the direction of the bottom of the housing unit. The bonding layer 520 filled in the recess 220 serves to fix the battery.

In addition, an open layer may be positioned between the adhesive layer 510 and the bonding layer 520 .

7 is a schematic diagram of a battery case including a main part structure according to a preferred embodiment of the present invention, and FIG. 8 is various exemplary cross-sectional views of the main part according to a preferred embodiment of the present invention.

The structure of the main part 220 will be described in detail with reference to FIGS. 7 to 8 .

As shown in the drawings, the recessed portion 220 according to the preferred embodiment of the present invention is preferably located on any one of the outer surfaces of the battery case 210 , and on the outer surface of the wide surface of the battery case 210 . location is best.

In general, the wide side of the battery is positioned to face the receiving part of the device. At this time, the coupling layer is filled in the recess 220 formed on the outer surface of the case surface facing the receiving part, so that the battery and the device can be combined. In the present invention, although the recess 220 is illustrated as being located on the wide surface of the battery case 210, this is only imposed as an example, and it is obvious that the battery and the device are not particularly limited as long as they are coupled face-to-face.

As shown in (a1) of Figure 8, the recess 220 is recessed from the outer surface of the case to the inside to have a rectangular cross section, and the recessed end edge of the recess 220 can be filleted with a predetermined radius of curvature (r). there is. As a result, the bonding layer 520 filled in the recess 220 can be in close contact with the entire inner wall surface of the recess 220, so that the bonding force can be improved.

In addition, the depth (t) of the recess 220 may be 0.08 mm to 0.2 mm, the recess indentation entrance width (w) may be 2 to 3 times the depth (t), the radius of curvature of the inner end edge of the recess (r) may be 1/2 times the depth (t). If the depth t of the recess 200 is less than 0.08 mm, the recess molding is difficult, and when the depth t is greater than 0.2 mm, the case 210 laminate sheet barrier layer is exposed and there is a risk of a short circuit, and the battery There is a risk that the case may be easily broken if it is inflated by the gas generated inside.

In addition, as shown in (a2) of FIG. 8, the cross-section of the recess 220 may have a tapered shape in which the width w gradually decreases toward the inner surface of the case. Since the main part of (a2) of FIG. 8 is the same as that of (a1) except that the end has a tapered shape, only the cross-sectional data shape of the main part will be described.

The recessed end edge may be filleted with a predetermined radius of curvature (r). The structure that gradually narrows into the recess of the recess 220 has the advantage that the bonding layer 520 by compression can be more easily filled in the recess 220, thereby reducing the battery compression pressure and preventing damage to the battery. .

In addition, as shown in (a3) of Figure 8, the cross section of the recess 220 may be a bow shape.

The cross section of the main portion 220 according to (a3) of FIG. 8 is the same as that of (a1) except that it has a bow shape, and thus a detailed description thereof will be omitted.

Although FIG. 8 shows a rectangular shape, a tapered shape, and a bow shape with rounded corners, it is not particularly limited as long as it has a shape capable of improving the bonding force between the battery and the device by filling the bonding layer 520 .

Here, the recess 220 may be formed through stamping or casting.

9 is an enlarged view of a main portion pattern formed in a battery case according to a preferred embodiment of the present invention.

The pattern of the main portion 220 will be described in detail with reference to FIG. 9 .

It is preferable that the concave portion 220 is a plurality of patterns of a predetermined shape, and it is more preferable that the first concave portion 221 and the second concave portion 222 are formed to cross each other. Here, it is most preferable that the plurality of first recesses 221 are arranged in parallel with a predetermined distance apart, while the plurality of second recesses 222 are also spaced apart by a predetermined distance and positioned to form a right angle with the first recesses 221 . Do.

Here, it is preferable that the interval (G) between the concave portions 220 adjacent in parallel is 6 mm or more. When the gap (G) is 6 mm or less, the recess 220 forming process becomes difficult, and the recess 220 is excessively formed in the battery case, so that the case can be easily broken when the case expands due to the generation of gas inside the battery. Not desirable.

In addition, the first recessed portion 221 and the second recessed portion 222 may be spaced apart from each other at an interval of 6 mm or more, and the interval G may vary depending on the position on the outer surface of the case 210 . For example, the interval between the recesses at the central position of the edge of the wide surface of the case 210 may be wider than the interval at both end positions.

In addition, the first recess 221 and the second recess 222 may be positioned parallel to the edge of the battery case 210 or positioned at a predetermined angle.

On the other hand, although the first concave portion 221 and the second concave portion 222 are shown to have a straight shape in (b1) and (b2) of FIGS. It may be formed only on a part of the outer surface of

Also, in the recess 220 , the first recess 221 may have a broken line shape instead of a solid line shape. Specifically, as shown in (b3) of FIG. 9, it may be formed in the form of a broken line spaced apart by a predetermined distance and arranged in parallel.

When the first recess 221 is configured in a broken line shape as shown in (b3) of FIG. 9 , the length and spacing of the recess can be selectively added according to the position of the outer surface of the case 210, thereby simplifying the recess molding process and In addition, there is an advantage that production costs can be reduced.

Also, as shown in (b4) of FIG. 9 , the recess 220 may have a recessed hemispherical shape. Here, the indentation depth (t) of the hemisphere may be in the range of 0.08 mm to 0.2 mm, and the entrance width (w) of the carry-in part may be 2 to 3 times the depth (t).

In the present invention, the recess 220 may be formed directly on the outermost layer of the laminate sheet forming the battery case 210 .

In addition, although not shown, the sheet layer in which the recess 220 is formed may be disposed at a desired position of the case 210 using an adhesive.

That is, after housing the electrode assembly inside the case 210 and injecting the electrolyte, the first concave portion 221 and the second concave portion 222 are formed on the outer surface of the sealed case 210 by fixing the sheet layer. Therefore, the installation of the recess 220 is very easy, and in addition, the recess 220 can be selectively added to the outer surface of the case, thereby reducing production costs.

As the specific part of the present invention has been described in detail above, for those of ordinary skill in the art, these specific descriptions are only preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and it is natural that such variations and modifications fall within the scope of the appended claims.

100: back cover
200: battery
210: case
220: Yobu
221: first main part
222: second principal
300: inner frame
310: storage unit
320: space part
400: front cover
410: display
500: fixed part
510: adhesive layer
520: bonding layer
w: width
t: depth
r: radius of curvature

Claims (10)

In the battery 200 in which the electrode assembly is accommodated in the case 210,
A battery, characterized in that a plurality of recesses (220) are formed on the outer surface of the case (210).
According to claim 1,
The battery, characterized in that the recess 220 is formed on one surface of the wide surface (XY surface) of the case (210).
According to claim 1,
The concave portion 220 is in the form of a recess, and the recessed end edge is filleted with a certain radius of curvature (r).
According to claim 1,
The recess 220 is a battery, characterized in that the stripe shape.
4. The method of claim 3,
The concave portion 220 is a battery, characterized in that the first concave portion 221 and the second concave portion 222 intersect each other.
4. The method of claim 3,
The recess 220 is a battery, characterized in that made in a fractured shape.
According to claim 1,
The case 210 is a battery, characterized in that made of a laminate sheet in which a resin layer and a metal layer are sequentially stacked.
A portable device for disposing the battery of claim 1 in the internal storage unit (310).
9. The method of claim 8,
The main part 200 of the battery faces the bottom surface of the accommodating part 310,
A portable device, characterized in that the bonding layer (520) filled in the recess (200) is located on the bottom surface of the receiving unit.
10. The method of claim 9,
The bonding layer 530 is a portable device, characterized in that the silicon material.

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