Battery pack

Abstract

To provide a battery pack in which a cell room can be increased in size and capacity by reducing the thickness of a tape applied to the cell room and a terrace, and the entire size can be reduced by reducing the thickness of a tape on a protection circuit module side.SOLUTION: A battery pack according to the present disclosure includes an electrode assembly, a battery cell including an exterior material equipped with a room part that accommodates the electrode assembly internally and a terrace part where an electrode tab electrically connected to the electrode assembly protrudes, a protection circuit module electrically connected to the battery cell and disposed on the terrace part, and an insulating part disposed between the protection circuit module and the terrace part and between the room part and the protection circuit module.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] Various embodiments of this disclosure relate to battery packs. [Background technology]

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries are used in portable small electronic devices such as smartphones, feature phones, laptops, digital cameras, and video cameras, while high-capacity secondary batteries are widely used as power sources for motors in hybrid vehicles and electric vehicles, as well as for power storage. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case to house it, and electrode terminals connected to the electrode assembly.

[0003] Such a secondary battery may include an electrode assembly comprising a positive electrode plate, a separator, and a negative electrode plate, and an outer casing material that houses the electrode assembly. The outer casing material can be classified into circular, rectangular, and pouch-type shapes depending on its form.

[0004] Pouch-type rechargeable batteries include a laminated pouch that is easily deformable into various shapes and has low weight, and may further include a protection circuit module mounted on one side of the laminated pouch to control the charging and discharging of the battery.

[0005] The aforementioned information disclosed in the technology underlying such inventions is merely intended to improve understanding of the background of the present invention, and therefore may include information that does not constitute prior art. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The present invention provides a battery pack that allows for expansion of the cell room size and increase of capacity by reducing the thickness of the tape applied to the cell room and terrace, and allows for overall slimming by reducing the thickness of the tape on the protection circuit module side.

[0007] Furthermore, the present invention provides a battery pack that can prevent the cell room from being pressed during a fall impact, regardless of the structure of the electrode assembly, thereby suppressing the risk of short circuits in the electrode assembly.

[0008] However, the technical problems that the present invention aims to solve are not limited to those described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0009] A battery pack according to one embodiment of the present invention for solving the aforementioned technical problems includes a battery cell comprising an outer material having an electrode assembly, a room portion housing the electrode assembly, and a terrace portion from which electrode tabs electrically connected to the electrode assembly protrude; a protection circuit module electrically connected to the battery cell and disposed on the terrace portion; and insulating portions disposed between the protection circuit module and the terrace portion, and between the room portion and the protection circuit module.

[0010] In some examples, the insulating portion may include a first region interposed between the protective circuit module and the terrace portion and arranged parallel to the terrace portion, and a second region connected at an angle to the first region and interposed between the room portion and the protective circuit module.

[0011] In some examples, the insulating portion may include an insulating sheet provided in the first region and the second region, or in the second region, and an adhesive member provided on at least one of the first surface and the second surface facing the first surface of the insulating sheet.

[0012] In some examples, the insulating portion may further include a double-sided tape attached to at least one of the first surface and the second surface of the insulating sheet and / or one surface of the adhesive member for fixing the insulating sheet and / or the adhesive member.

[0013] In some examples, at least a part of the first region and the second region may be connected.

[0014] In some examples, the insulating sheet is provided in the second region, the adhesive member is attached to the first surface of the insulating sheet provided in the second region, and may extend to the first region.

[0015] In some examples, the double-sided tape may be attached to one surface of the adhesive member in the first region extending from the second region.

[0016] In some examples, the insulating sheet is provided separately in the first region and the second region, and the adhesive member may be integrally bent and attached to the second surface of each of the insulating sheet in the first region and the insulating sheet in the second region.

[0017] In some examples, corresponding to each of the separately provided insulating sheets, the double-sided tape may be separately attached to the first surface of the insulating sheet.

[0018] In some examples, the insulating sheet is provided in the first region and the second region, and the double-sided tape may be attached to the first surface and the second surface of the insulating sheet.

[0019] In some examples, between the insulating sheet provided in the first region and the insulating sheet provided in the second region, it may be cut open in the form of dots.

[0020] In some examples, the double-sided tape on the first surface of the insulating sheet may be cut in a manner corresponding to the shape of the dots on the insulating sheet.

[0021] In some examples, between the insulating sheet provided in the first region and the insulating sheet provided in the second region to teeth 、 A notch structure may be formed.

[0022] In some examples, the double-sided tape on the first and second surfaces of the insulating sheet may form a notched structure corresponding to the notched structure of the insulating sheet.

[0023] In some cases, the insulating sheet may be made of PC material.

[0024] In some examples, the outer end of the insulating portion provided in the second region may be located on the same line as or lower than the upper side of the room portion.

[0025] In some examples, the end of the insulating portion provided in the first region may protrude compared to the end of the terrace portion.

[0026] In some examples, the protective member may further include one surface of the terrace portion and at least one surface of the protective circuit module.

[0027] In some examples, the protection circuit module may further include a connector for electrically connecting the battery pack to an external device.

[0028] In some examples, the protection circuit module may be arranged such that the charge / discharge protection device mounted on the protection circuit module faces the terrace portion. [Effects of the Invention]

[0029] The present invention provides a battery pack that allows for expansion of the cell room size and increase of capacity by reducing the thickness of the tape applied to the cell room and terrace, and allows for overall slimming by reducing the thickness of the tape on the protection circuit module side.

[0030] Furthermore, according to the present invention, a battery pack is provided that can prevent the cell room from being pressed during a fall impact, regardless of the structure of the electrode assembly, thereby suppressing the risk of short circuits in the electrode assembly.

[0031] However, the effects that can be obtained through the present invention are not limited to those described above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the description of the invention below. [Brief explanation of the drawing]

[0032] The following drawings accompanying this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention that follows, serve to further illustrate the technical concept of the present invention. Therefore, the present invention should not be construed as being limited solely to the matters depicted in such drawings. [Figure 1] This is an exploded perspective view illustrating a battery pack according to one embodiment of the present disclosure. [Figure 2] This is a partially illustrated cross-sectional view of a side view of a battery pack according to one embodiment of the present disclosure. [Figure 3] These are front and side cross-sectional views of the insulating portion before bending according to various embodiments of the present disclosure. [Figure 4] These are front and side cross-sectional views of the insulating portion before bending according to various embodiments of the present disclosure. [Figure 5] These are front and side cross-sectional views of the insulating portion before bending according to various embodiments of the present disclosure. [Figure 6] These are front and side cross-sectional views of the insulating portion before bending according to various embodiments of the present disclosure. [Figure 7]This is a schematic diagram illustrating a smartphone equipped with a secondary battery according to one embodiment of the present invention. [Figure 8a] This is a perspective view illustrating an exemplary battery pack. [Figure 8b] This is a perspective view illustrating an exemplary battery pack. [Figure 9a] These are perspective and side views illustrating an exemplary vehicle body and body parts. [Figure 9b] These are perspective and side views illustrating an exemplary vehicle body and body parts. [Modes for carrying out the invention]

[0033] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Prior to this, terms and words used in this specification and claims should not be interpreted restrictively in their usual or dictionary sense, but should be interpreted in a sense and concept consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may appropriately define the concepts of terms in order to best describe their own invention. Accordingly, the embodiments described herein and the configurations illustrated in the drawings represent only some of the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and it should be understood that there may be a variety of equivalents and modifications that can substitute for them at the time of filing. Also, as used herein, "comprise, include" and / or "comprising, including" specify the presence of the shapes, figures, stages, actions, members, elements and / or groups thereof mentioned, and do not exclude the presence or addition of one or more other shapes, figures, actions, members, elements and / or groups thereof. Also, when describing embodiments of the present invention, "may" and "may include" "one or more embodiments of the present invention."

[0034] Furthermore, to aid in understanding the invention, the accompanying drawings are not shown to actual scale, and the dimensions of some components may be exaggerated. Also, the same reference numeral may be assigned to the same component in different embodiments.

[0035] The statement that two comparison objects are "identical" means that they are "substantially identical." Therefore, substantially identical objects may include those with deviations considered low in the industry, for example, deviations of 5% or less. Furthermore, the uniformity of certain parameters within a given domain may mean uniformity in terms of averages.

[0036] For example, terms such as "first," "second," etc., are used to describe various components, but it goes without saying that these components are not limited by these terms. These terms are simply used to distinguish one component from another, and in particular, unless otherwise stated, the first component may be the second component.

[0037] Throughout the specification, unless otherwise stated, each component may be singular or plural.

[0038] To say that any configuration is positioned "above (or below)" or "above (or below)" a component means not only that the configuration is positioned in contact with the upper (or lower) surface of the said component, but also that other configurations may be interposed between the said component and any configuration positioned on (or below) it.

[0039] Furthermore, when it is stated that one component is “connected,” “bonded,” or “connected” to another component, it should be understood that the components may be directly connected to or connected to one another, but other components may be “interposed” between them, or each component may be “connected,” “bonded,” or “connected” through other components. Also, when it is stated that one part is electrically coupled to another part, this includes not only cases where they are directly connected, but also cases where they are connected with other elements in between.

[0040] Throughout the specification, when we use "A and / or B," this means A only, B only, or A and B, unless otherwise specified. In other words, "and / or" includes all combinations or any combination of the listed items. When we use "C to D," this means C to D, unless otherwise specified.

[0041] Generally, in the case of IT (Information Technology) and small pouch packs, battery control circuit components such as PCM (Protection Circuit Module), PMP (Protection Module Package), and BMS (Battery Monitoring System) are mounted on top of the cell terrace. To mount the battery control circuit board on top of the cell terrace, tape is applied to the cell terrace and cell room side for insulation and to reduce impact from drops. Without tape, there is a high possibility of pouch rust occurring due to current flow and damage or rupture of pouch cells due to impact from drops, resulting in a strong short circuit (hard short), which increases the probability of events such as fire. To prevent this, the tape applied is made of polyurethane material such as Poron and silicone material such as Rubber for insulation and impact reduction, and in some cases, PET (Polyethylene terephthalate), PI (Polyimide), and Nomex tape may be applied to the cells together for additional insulation.

[0042] However, in the case of Poron and rubber tapes, due to the properties of the materials, they absorb impact when dropped, but if they receive an excessive localized impact, the battery control circuit components will press against the room, which may affect the electrode assembly and cause a short circuit. For this reason, in one embodiment, a PC (Polycarbonate) material is applied to the insulating part, and the insulating part is interposed in front of the room to disperse the impact over a wide area, and due to the properties of the material, even if an excessive localized impact is received, it is possible to prevent the electrode assembly from being affected.

[0043] Furthermore, due to the manufacturing process, it is impossible to produce Poron and rubber tape with a thickness of less than 0.2 mm, nor is it possible to make the thickness excessively large. However, in one embodiment, by applying PC material to the insulating part, the thickness can be freely adjusted from 0.1 mm as desired by the designer, which may allow for expansion of the room area, and therefore, improvement of ED (Energy Density) may be possible.

[0044] Furthermore, since rubber and polon have a flame retardancy rating of HF (Horizontal Burning Foamed Material Test) and do not conform to the current IT-related IEC (International Electrotechnical Commission) international standard requiring V-0, a V-0 flame retardancy tape must be additionally attached to the room side to conceal the battery control circuit components and the tape on the terrace side. In one embodiment, PC material is used for the insulating part. In the case of PC material, the V-0 flame retardancy tape (protective material) that must be additionally attached only needs to conceal the battery control circuit components, and does not need to be attached to the room side. Therefore, the degree of freedom in pack design is increased, and since tape is not attached to the room side, the cell thickness can be increased, and thus the ED can be improved.

[0045] Furthermore, with conventional tapes, in order to reduce the height of the protection circuit module, it was necessary to attach Poron or rubber to the room portion and additionally attach insulating tape such as PET, PI, or Nomex to the terrace portion. In one embodiment, by applying PC material to the insulating portion, and attaching an insulating sheet of PC material only to the room portion side as needed, and attaching only adhesive material to the terrace portion side, the height of the protection circuit module can be reduced. In the case of a protection circuit module, the set and pack FPCB (Flexible Printed Circuit Board) pass over the relevant part, so the lower the relevant part, the more important it is to slim down the set, such as IT equipment.

[0046] Below, we will specifically describe the structure of one such embodiment.

[0047] Figure 1 is an exploded perspective view illustrating a battery pack 100 according to one embodiment of the present disclosure. Figure 2 is a cross-sectional view partially illustrating a side view of the battery pack 100 according to one embodiment of the present disclosure.

[0048] Referring to Figures 1 and 2, in one embodiment, the battery pack 100 may include a battery cell 110, a protection circuit module 120, and an insulating section 130. In some examples, the battery pack 100 may further include a protective member 140 and / or a cover 150.

[0049] The battery cell 110 may include an electrode assembly (110A, see Figure 2), a positive electrode cell tab 114, a negative electrode cell tab 115, and an outer casing 116. The positive electrode cell tab 114 may extend outside the outer casing 116 while remaining connected to the positive electrode plate 111 of the electrode assembly 110A, and the negative electrode cell tab 115 may extend outside the outer casing 116 while remaining connected to the negative electrode plate 112 of the electrode assembly 110A. The positive electrode cell tab 114 and the negative electrode cell tab 115 may be surrounded by insulating and adhesive tab tapes 115a, respectively, to improve sealing with the outer casing 116 and for electrical insulation from the outer casing 116. The exterior material 116 may include a first exterior section 116a, a second exterior section 116b, a third exterior section 116c, a fourth exterior section 118, a fifth exterior section 117, and surrounding sealing sections 119a, 119b, and the positive electrode cell tab 114 and negative electrode cell tab 115 may extend to the outside of the battery cell 110 through the fourth exterior section 118. In some examples, the fourth exterior section 118 may include or be referred to as a terrace section. Hereinafter, the fourth exterior section 118 will be referred to as the terrace section 118.

[0050] In some examples, the battery cell 110 includes an electrode assembly 110A to which a positive electrode cell tab 114 and a negative electrode cell tab 115 are connected. The electrode assembly 110A can include a first electrode plate 111, a second electrode plate 112, and a separator 113 therebetween. In some examples, the first electrode plate 111 can be a positive electrode plate, the second electrode plate 112 can be a negative electrode plate, and vice versa. In some examples, the electrode assembly 110A can be surrounded by an exterior member 116. In some examples, a liquid electrolyte, a gel electrolyte, or a solid electrolyte can be accommodated inside the exterior member 116.

[0051] As the positive electrode active material constituting the positive electrode plate, a compound capable of reversible intercalation and deintercalation of lithium (lithiated intercalation compound) can be used. Specifically, one or more of composite oxides of metals selected from cobalt, manganese, nickel, and combinations thereof and lithium can be used.

[0052] The composite oxide can be a lithium transition metal composite oxide. Specific examples include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel-manganese-based oxides, or combinations thereof.

[0053] As an example, a compound represented by any one of the following chemical formulas can be used. Li a A 1-b [ X b [ O 2-c [ D c [ (0.90 ≦ a ≦ 1.8, 0 ≦ b ≦ 0.5, 0 ≦ c ≦ 0.05); Li a [ Mn 2-b [ X b [ O 4-c [ D c [ (0.90 ≦ a ≦ 1.8, 0 ≦ b ≦ 0.5, 0 ≦ c ≦ 0.05); Li a [ Ni 1-b-c [ Co b [ X c [ O 2-α [ Dα (0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.5, 0<α<2);Li a Ni 1-b-c Mn b X c O 2-α D α (0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.5, 0<α<2);Li a Ni b Co c L1 d G e O2(0.90≦a≦1.8, 0≦b≦0.9, 0≦c≦0.5, 0≦d≦0.5, 0≦e≦0.1);Li a NiG b O2(0.90≦a≦1.8, 0.001≦b≦0.1);Li a CoG b O2(0.90≦a≦1.8, 0.001≦b≦0.1);Li a Mn 1-b G b O2(0.90≦a≦1.8, 0.001≦b≦0.1);Li a Mn2G b O4(0.90≦a≦1.8, 0.001≦b≦0.1);Li a Mn 1-g G g PO4(0.90≦a≦1.8, 0≦g≦0.5);Li (3-f) Fe2(PO4)3(0≦f≦2);Li a FePO4 (0.90 ≤ a ≤ 1.8).

[0054] In the above chemical formula, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L1 is Mn, Al, or a combination thereof.

[0055] The positive electrode for a lithium secondary battery can include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer contains a positive electrode active material and can further contain a binder and / or a conductive material.

[0056] The content of the positive electrode active material is 90% to 99.5% by weight based on 100% by weight of the positive electrode active material layer, and the contents of the binder and the conductive material can be 0.5% to 5% by weight respectively based on 100% by weight of the positive electrode active material layer.

[0057] As the current collector, Al can be used, but it is not limited thereto.

[0058] The negative electrode active material constituting the negative electrode plate includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and undoping with lithium, or a transition metal oxide.

[0059] The material capable of reversibly intercalating / deintercalating lithium ions is a carbon-based negative electrode active material and can include, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of the crystalline carbon include graphite such as natural graphite or artificial graphite, and examples of the amorphous carbon include soft carbon, hard carbon, mesophase pitch carbide, fired coke, and the like.

[0060] As the material capable of doping and undoping with lithium, an Si-based negative electrode active material or a Sn-based negative electrode active material can be used. The Si-based negative electrode active material can be silicon, a silicon-carbon composite, SiO x (0 < x < 2), an Si-based alloy, or a combination thereof.

[0061] The silicon-carbon composite described above may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in a form in which silicon particles and amorphous carbon are coated on the surface of the silicon particles.

[0062] The silicon-carbon composite described above may further contain crystalline carbon. For example, the silicon-carbon composite may include a core containing crystalline carbon and silicon particles and an amorphous carbon coating layer located on the surface of this core.

[0063] A negative electrode for a lithium secondary battery includes a current collector and a negative electrode active material layer located on the current collector. The negative electrode active material layer comprises a negative electrode active material and may further include a binder and / or a conductive material.

[0064] For example, the negative electrode active material layer may contain 90% to 99% by weight of the negative electrode active material, 0.5% to 5% by weight of the binder, and 0% to 5% by weight of the conductive material.

[0065] The aforementioned binder can be a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof. When an aqueous binder is used as the negative electrode binder, it may further contain a cellulose series compound that can impart viscosity.

[0066] As the negative electrode current collector, you can use copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, or a combination thereof.

[0067] The electrolyte for lithium secondary batteries contains a non-aqueous organic solvent and a lithium salt.

[0068] The aforementioned non-aqueous organic solvent acts as a medium through which ions involved in the electrochemical reaction of the battery can move.

[0069] The aforementioned non-aqueous organic solvents may be carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvents, aprotic solvents, or combinations thereof, and can be used alone or in mixtures of two or more.

[0070] Furthermore, when using carbonate-based solvents, cyclic carbonates and linear carbonates can be mixed and used together.

[0071] Depending on the type of lithium secondary battery, a separator may be present between the positive and negative electrodes. Such separators may include polyethylene, polypropylene, polyvinylidene fluoride, or multilayer films of two or more layers thereof.

[0072] The separator may include a porous substrate and a coating layer comprising organic, inorganic, or a combination thereof located on one or both sides of the porous substrate.

[0073] The aforementioned organic material may include polyvinylidene fluoride polymers or (meth)acrylic polymers.

[0074] The aforementioned inorganic materials may include, but are not limited to, inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof.

[0075] The aforementioned organic and inorganic materials may exist mixed in a single coating layer, or they may exist in a form in which a coating layer containing organic materials and a coating layer containing inorganic materials are stacked.

[0076] In some examples, the electrode assembly 110A may be housed within the exterior material 116, surrounded by a first exterior portion 116a, a second exterior portion 116b, a third exterior portion 116c, and a curved portion 116d. That is, the battery pack 100 may include a room portion 116A in which the electrode assembly 110A is housed, and terrace portions 118 from which positive electrode cell tabs 114 and negative electrode cell tabs 115, which are electrically connected to the electrode assembly 110A, protrude. Hereinafter, the interior of the exterior material 116 in which the electrode assembly 110A is housed will be referred to as the room portion 116A.

[0077] The exterior material 116 protects the electrode assembly 110A from the external environment, and for this purpose, in addition to the surrounding sealing portions 119a and 119b, a fourth exterior portion 118 may also be sealed. In some examples, the fourth exterior portion 118 may also include the area sealed with the first exterior portion 116a. In some examples, the fourth exterior portion 118 may mean the area that extends forward from the third exterior portion 116c and is subsequently sealed, and the area that extends forward from the first exterior portion 116a and is subsequently sealed.

[0078] In some examples, the exterior material 116 may include, or be referred to as, a laminate exterior material with a thin metal film at its core, and insulating layers provided on its upper and lower surfaces, respectively. In some examples, the first exterior portion 116a may be located below the electrode assembly 110A, and the second exterior portion 116b may be located above the first exterior portion 116a and above the electrode assembly 110A. A third exterior portion 116c may be located in front of the second exterior portion 116b.

[0079] In some examples, the fourth exterior section is a terrace section 118, as described above, extending from the third exterior section 116c and the first exterior section 116a, through which the positive electrode cell tab 114 and the negative electrode cell tab 115 can pass. In some examples, the plane of the terrace section 118 may be approximately parallel to the plane of the first exterior section 116a and / or the plane of the second exterior section 116b, and approximately perpendicular to the plane of the third exterior section 116c. In some examples, a curved section 116d may be further provided between the second exterior section 116b and the third exterior section 116c. In some examples, perimeter sealing sections 119a, 119b may extend to both sides of the terrace section 118 and be bent upward.

[0080] In some examples, the protection circuit module 120 may be located on the battery cell 110. In some examples, the protection circuit module 120 may be located on the terrace portion 118 of the battery cell 110. The protection circuit module 120 may include a printed circuit board 121 having a circuit pattern, a positive electrode weld tab into which a positive electrode cell tab 114 is inserted or positioned and welded, a negative electrode weld tab into which a negative electrode cell tab 115 is inserted or positioned and welded, a charge / discharge protection device 124 (e.g., an integrated circuit, a switching element, a resistor, a sensor, etc.), and a connector 125. The protection circuit module 120 can protect the battery cell 110 from overcharging and over-discharging by monitoring the charge / discharge voltage, charge / discharge current and / or temperature of the battery cell 110, etc. The connector 125 can be connected to external electronic equipment to charge or discharge the battery cell 110. In some examples, the connector 125 of the protection circuit module 120 may extend along the longitudinal direction of the printed circuit board 121. In some cases, the connector 125 can be electrically connected to electronic equipment after being bent into various shapes.

[0081] In some examples, the insulating portion 130 may be located between the protection circuit module 120 and the terrace portion 118, and between the room portion 116A and the protection circuit module 120. In some examples, the insulating portion 130 may include a first region 130a interposed between the protection circuit module 120 and the terrace portion 118 and arranged parallel to the terrace portion 118, and a second region 130b connected to the first region 130a at an angle (e.g., approximately 60 to 120 degrees) and interposed between the room portion 116A and the protection circuit module 120. In some examples, the insulating portion 130 may be provided in an approximately "L" shape. Furthermore, in some examples, the insulating portion 130 may include an insulating sheet 131 provided in the first region 130a and the second region 130b, the first region 130a, or the second region 130b, and an adhesive member 132 provided on at least one of the first surface of the insulating sheet 131 and the second surface facing the first surface. A specific description of such an insulating portion 130 will be given later.

[0082] In some examples, the protective member 140 surrounds the terrace portion 118 and the protective circuit module 120, thereby not only insulating the protective circuit module 120 from the external environment but also protecting the battery cell 110 from external impact. In some examples, the protective member 140 can cover one side of the terrace portion 118 and at least one side of the protective circuit module 120.

[0083] Referring to Figure 2, the protective member 140 may be bent at least four times to extend from the lower surface of the terrace portion 118 to the upper surface of the terrace portion 118. The protective member 140 may be positioned on the lower surface of the terrace portion 118, the side surface of the protective circuit module 120, the upper surface of the protective circuit module 120, and the front surface of the room portion 116A between the protective circuit module 120 and the insulating portion 130, so as to surround the terrace portion 118 and the protective circuit module 120. In some examples, the protective member 140 may have holes formed to allow a printed circuit board to pass through. In some examples, the protective member 140 may include a first region 140a attached to the lower surface of the terrace portion 118, and a second region 140b extending from the first region 140a and positioned parallel to the insulating portion 130 on one side surface of the protective circuit module 120. Furthermore, the protective member 140 may include a third region 140c extending from the second region 140b and positioned parallel to the second outer casing 116b on the upper side of the protective circuit module 120, and a fourth region 140d extending from the third region 140c and positioned between the insulating portion 130 and the other side of the protective circuit module 120. The protective member 140 may also include a fifth region 140e extending from the fourth region 140d and positioned between the lower side of the protective circuit module 120 and the terrace portion 118. The fifth region 140e may be positioned on the upper surface of the first region 130a of the insulating portion 130 interposed on the upper surface of the terrace portion 118.

[0084] In some examples, a protective circuit module 120 may be housed in a cavity 145 provided between the third region 140c and the fifth region 140e, and between the second region 140b and the fourth region 140d of the protective member 140. The cavity 145 may have horizontal and vertical widths sufficient to accommodate the protective circuit module 120, which includes a printed circuit board 121 and a charge / discharge protection device 124.

[0085] Therefore, by covering the protective circuit module 120, the positive electrode cell tab 114, and the negative electrode cell tab 115, the protective member 140 not only ensures the insulation of the protective circuit module 120, but also ensures the insulation of the positive electrode cell tab 114 and the negative electrode cell tab 115. Furthermore, while conventional protective members 140 are positioned to extend from the terrace portion 118 to the top surface (second outer casing) of the battery cell 110, limiting the overall size reduction, the present invention allows for a slimmer structure by not covering the top surface (second outer casing) of the battery cell 110.

[0086] The cover 150 may include side covers 151 and 152 that surround and protect the sides of the battery cell 110, and a rear cover 153 that surrounds and protects the rear of the battery cell 110. In some examples, the side covers 151 and 152 may surround sealing portions 119a and 119b around the battery cell 110, respectively, and the rear cover 153 may surround a fifth outer casing 117 of the battery cell 110, thereby protecting the battery cell 110 from external impacts.

[0087] Figures 3 to 6 are front and side cross-sectional views of the insulating portion 130 before bending, according to various embodiments of the present disclosure. Hereinafter, various embodiments of the insulating portion 130 will be described with reference to Figures 3 to 6.

[0088] The insulating portion 130 may be interposed on the terrace portion 118 and the third outer portion 116c of the outer material 116. In some examples, the insulating portion 130 may be provided from an insulating material including PC (polycarbonate). However, it may be provided from an insulating material such as PI (polyimide), PP (polypropylene), or PE (polyethylene) that is thin by a set thickness and can ensure rigidity.

[0089] In some examples, the first region 130a of the insulating portion 130 may be located on the terrace portion 118 of the exterior material 116, and the second region 130b of the insulating portion 130 may be located on the side of the third exterior portion 116c of the exterior material 116. In some examples, the end of the second region 130b of the insulating portion 130 may be on the same line as the second exterior portion 116b of the exterior material 116, or even lower. In some examples, the height of the second region 130b of the insulating portion 130 may be the same as or less than the height of the third exterior portion 116c. In some examples, the height of the third exterior portion 116c may mean the height to the uppermost end of the curved portion 116d connected to the second exterior portion 116b. That is, the second region 130b of the insulating portion 130 may not protrude beyond the second exterior portion 116b. In some cases, the insulating portion 130 can be attached to the room portion 116A as much as possible without protruding beyond the exterior material 116.

[0090] Furthermore, in some examples, the length d1 between the end of the first region 130a of the insulating portion 130 and the end of the terrace portion 118 may be 1 mm or more. That is, the end of the first region 130a of the insulating portion 130 may protrude further than the end of the terrace portion 118.

[0091] In some examples, the insulating portion 130 may further include double-sided tape 133 attached to at least one of the first surface A and second surface B of the insulating sheet 131 and / or one surface of the adhesive member 132 for fixing the insulating sheet 131 and / or the adhesive member 132. Here, the first surface A may mean the surface that comes into contact with the room portion 116A and terrace portion 118 side during assembly, and the second surface B may mean the opposite surface.

[0092] Figure 3(a) is a front cross-sectional view of the unfolded insulating portion 130 before the double-sided tape 133 is applied, illustrating the second surface B in the state before the double-sided tape 133 is applied. Figure 3(b) is a side cross-sectional view of the unfolded insulating portion 130 after the double-sided tape 133 has been applied, where the left side of the drawing may be the second surface B and the right side may be the first surface A. Depending on the embodiment, the orientation can also be reversed during assembly.

[0093] Referring to Figure 3, the insulating sheet 131 may be provided in the second region 130b of the insulating portion 130. The adhesive member 132 may be attached to the first surface A of the insulating sheet 131 provided in the second region 130b of the insulating portion 130 and extended to the first region 130a. Such an insulating portion 130 may be bent at the bend portion 132a between the first region 130a and the second region 130b during the assembly of the battery cell 110. At this time, the adhesive member 132 may be bent into a roughly "L" shape. In some examples, double-sided tape 133 may be attached to one side (the second surface side) of the adhesive member 132 in the first region 130a. At this time, although not shown in the drawings, the double-sided tape 133 may also be attached to at least a part of the second surface of the insulating sheet 131. A structure like that shown in Figure 3 is illustrated in Figure 2. In this structure, since the first region 130a on the terrace portion 118 side is not provided with an insulating sheet 131, the height on the protective circuit module 120 side can be reduced. In some examples, the thickness of the insulating sheet 131 may be approximately 0.10 mm to approximately 0.20 mm, the thickness of the adhesive member 132 may be approximately 0.05 mm, and the thickness of the double-sided tape 133 may be approximately 0.05 mm. Furthermore, the insulating sheet 131 may be made of PC material, and the adhesive member 132 may be made of PET material.

[0094] Figure 4(a) is a front cross-sectional view of the unfolded insulating portion 230 before the double-sided tape 233 is applied, illustrating the first surface A in the state before the double-sided tape 233 is applied. Figure 4(b) is a side cross-sectional view of the unfolded insulating portion 230 after the double-sided tape 233 has been applied, where the left side of the drawing may be the second surface B and the right side may be the first surface A. Depending on the embodiment, the orientation may also be reversed during assembly.

[0095] Referring to Figure 4, the space between the insulating sheet 231 provided in the first region 230a and the insulating sheet 231 provided in the second region 230b can be cut in the form of dots. This makes it possible to make even materials that are not easily bendable more easily. At this time, the double-sided tape 233 can be attached to the first surface A and the second surface B of the insulating sheet 231. In some examples, the double-sided tape 233 on the first surface A of the insulating sheet 231 can be cut in the form of dots corresponding to the insulating sheet 131. Such an insulating portion 230 can be bent at the bending portion 231a between the first region 230a and the second region 230b during the assembly of the battery cell 110. At this time, the insulating sheet 231 and the double-sided tape 233 on the second surface B can be bent in a roughly "L" shape. In some cases, the thickness of the insulating sheet 231 may be approximately 0.10 mm to approximately 0.20 mm, and the thickness of the double-sided tape 233 may be approximately 0.05 mm. Furthermore, the insulating sheet 231 may be made of PC material.

[0096] Figure 5(a) is a front cross-sectional view of the unfolded insulating portion 330 before the double-sided tape 333 is applied, illustrating either the first surface A or the second surface B before the double-sided tape 333 is applied. Figure 5(b) is a side cross-sectional view of the unfolded insulating portion 330 after the double-sided tape 333 has been applied, where the left side of the drawing may be the second surface B and the right side may be the first surface A. Depending on the embodiment, the orientation may also be reversed during assembly.

[0097] Referring to Figure 5, between the insulating sheet 331 provided in the first region 330a and the insulating sheet 331 provided in the second region 330b to teeth 、A notched structure can be formed. This makes it possible to make materials that are not easily bendable more easily. In this case, the double-sided tape 333 can be attached to the first surface A and the second surface B of the insulating sheet 331. The double-sided tape 333 on the first surface A and the second surface B of the insulating sheet 331 can form a notched structure corresponding to the notched structure of the insulating sheet 331. Such an insulating portion 330 can be bent at the bending portion 331a between the first region 330a and the second region 330b during the assembly of the battery cell 110. In this case, the insulating sheet 331 and the double-sided tape 333 on the first surface A or the second surface B can be bent in an approximately "L" shape. In some examples, the thickness of the insulating sheet 331 may be approximately 0.10 mm to approximately 0.20 mm, and the thickness of the double-sided tape 333 may be approximately 0.05 mm each. The insulating sheet 331 may also be made of PC material.

[0098] Figure 6(a) is a front cross-sectional view of the unfolded insulating portion 430 before the double-sided tape 433 is applied, illustrating the first surface A in the state before the double-sided tape 433 is applied. Figure 6(b) is a side cross-sectional view of the unfolded insulating portion 430 after the double-sided tape 433 has been applied, where the left side of the drawing may be the second surface B and the right side may be the first surface A. Depending on the embodiment, the orientation may also be reversed during assembly.

[0099] Referring to Figure 6, the insulating sheet 431 may be provided separately and spaced apart in the first region 430a and the second region 430b, respectively. The adhesive member 432 may be folded and attached integrally to the second surface B of the insulating sheet 431 in the first region 430a and the insulating sheet 431 in the second region 430b. This makes it possible to make even materials that are not easily bendable more easily. In some examples, the double-sided tape 433 may be attached separately to the first surface of the insulating sheet 431, corresponding to the separated insulating sheets 431. Such an insulating portion 430 may be folded at the folding portion 432a between the first region 430a and the second region 430b during the assembly of the battery cell 110. At this time, the adhesive member 432 may be folded into a roughly "L" shape. In some examples, the thickness of the insulating sheet 431 may be approximately 0.10 mm to approximately 0.20 mm, the thickness of the adhesive member 432 may be approximately 0.05 mm, and the thickness of the double-sided tape 433 may be approximately 0.05 mm. Furthermore, the insulating sheet 431 may be made of PC material, and the adhesive member 432 may be made of PET material.

[0100] As described above, according to various embodiments of the present invention, by applying a PC material insulating section 130 to the room section 116A and terrace section 118 of the IT and small pouch pack instead of the currently applied Poron or rubber insulating section, the need for additional attachment of PET, PI, PP tape, etc., is eliminated, and the pack structure can be simplified. Furthermore, since the relative thickness of the existing insulating section can be reduced, the size of the room section 116A can be expanded, and the cell ED can be improved by expanding it. In addition, regardless of the electrode assembly structure of the pouch cell (winding, stacking, etc.), it is possible to prevent the room section 116A from being pressed during a drop impact, thereby suppressing the risk of short circuits in the electrode assembly. Furthermore, a slimmer structure is possible by reducing the height of the relative protection circuit module 120 side of the existing insulating section and by eliminating the need for tape surrounding the room section.

[0101] In other words, this disclosure can provide a battery pack 100 that can disperse drop impact by interposing an insulating section 130, which includes an insulating sheet 131 made of PC material, between the room section 116A and the terrace section 118 and the protective circuit module 120. Furthermore, this disclosure can provide a battery pack 100 in which the insulating section 130 can be made slimmer to reduce its thickness.

[0102] Figure 7 is a schematic diagram illustrating a smartphone equipped with a secondary battery according to one embodiment of the present invention. As shown in Figure 7, the secondary battery 10 according to the embodiment of the present invention described above may be a small battery installed in a small portable device such as a smartphone 1000. In this case, the exemplary secondary battery 10 has a structure that allows for an increase in the capacity of the secondary battery 10 by slimming down the internal structure, so the secondary battery 10 described above may be a battery suitable for application to small portable devices. On the other hand, in this specification, secondary battery, battery, and cell have the same meaning, and only the description differs for the sake of convenience of explanation.

[0103] Furthermore, the secondary battery according to the above-described embodiment can be increased in size and used to manufacture a battery pack.

[0104] Figures 8a and 8b are perspective views illustrating an exemplary battery pack 30. The battery pack 30 may include a number of battery modules 20 and a housing 31 for housing the number of battery modules 20. For example, the housing 31 may include a first housing 31-1, a second housing 31-2, which are coupled in opposing directions with the number of battery modules 20 interposed between them. The number of battery modules 20 may be electrically connected using busbars 25-1, and the number of battery modules 20 may be electrically connected to each other in series / parallel or mixed series-parallel configurations to obtain the required electrical output.

[0105] Figures 9a and 9b are perspective and side views illustrating an exemplary vehicle body and vehicle body component 40. In Figure 9a, the battery pack 30 may include a battery pack cover 31-1 (which may correspond to the first housing) which is part of the underbody 41 of the vehicle, and a pack frame 31-2 (which may correspond to the second housing) which is located at the bottom of the underbody 41 of the vehicle. The battery pack cover 31-1 and the pack frame 31-2 may be integrally formed with the bottom 42 of the vehicle. The underbody 41 of the vehicle separates the inside from the outside of the vehicle, and the pack frame 31-2 may be located outside the vehicle.

[0106] As shown in Figure 9b, the vehicle 50 may consist of a body part 40 to which additional parts such as a hood 51 at the front of the vehicle and fenders 52 located at the front and rear of the vehicle, respectively, are attached. The vehicle 50 includes a battery pack 30 including a battery pack cover 31-1 and a pack frame 31-2, and the battery pack 30 may be attached to the body part 40.

[0107] Although the present invention has been described above, for example, by limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that a variety of modifications and variations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. [Explanation of Symbols]

[0108] 10: Secondary battery 20: Battery Module 25-1: Bus bar 30: Battery Pack 31: Housing 31-1: First housing (battery pack cover) 31-2: Second Housing (Pack Frame) 40: Body parts 41: Underbody 42: Bottom 50: Vehicles 51: Food 52: Fender 100: Battery Pack 110: Battery cell 110A: Electrode assembly 111: First electrode plate (positive electrode plate) 112: Second electrode plate (negative electrode plate) 113: Separator 114: Positive electrode cell tab 115: Negative electrode cell tab 115a: Adhesive tab tape 116: Exterior materials 116A: Room Section 116a: First exterior section 116b: Second exterior section 116c: Third outer section 116d: Curved part 117: Fifth exterior section 118: Fourth exterior section (terrace section) 119a, 119b: Surrounding sealing area 120: Protection circuit module 121: Printed circuit board 124: Charge / Discharge Protection Device 125: Connector 130, 230, 330, 430: Insulation part 130a, 140a, 230a, 330a, 430a: First area 130b, 140b, 230b, 330b, 430b: Second region 131, 231, 331, 431: Insulating sheets 132, 432: Adhesive material 132a, 231a, 331a, 432a: Folded section 133, 233, 333, 433: Double-sided tape 140: Protective component 140c: Third area 140d: Fourth Domain 145: Cavity 150: Cover 151, 152: Side cover 153: Rear cover 1000: Smartphone A: First side B: Second side d1: length

Claims

1. A battery cell comprising an electrode assembly, an exterior material having a room portion that houses the electrode assembly internally, and a terrace portion from which electrode tabs electrically connected to the electrode assembly protrude, A protective circuit module is electrically connected to the battery cell and positioned on the terrace portion, Including insulating parts disposed between the protection circuit module and the terrace portion, and between the room portion and the protection circuit module, The insulating portion is A first region interposed between the protection circuit module and the terrace portion and arranged parallel to the terrace portion, It includes a second region that is connected to the first region at an angle and interposed between the room portion and the protection circuit module, The insulating portion is An insulating sheet provided in the first region and the second region, or in the second region, The insulating sheet includes an adhesive member provided on at least one of the first surface and the second surface facing the first surface, The insulating portion further includes double-sided tape attached to at least one of the first and second surfaces of the insulating sheet and / or one surface of the adhesive member for fixing the insulating sheet and / or the adhesive member, The aforementioned insulating sheet is a battery pack made of PC material.

2. The battery pack according to claim 1, wherein the first region and the second region are connected in at least part.

3. The insulating sheet is provided in the second region, The battery pack according to claim 2, wherein the adhesive member is attached to the first surface of the insulating sheet provided in the second region and extends to the first region.

4. The battery pack according to claim 3, wherein the double-sided tape is attached to one surface of the adhesive member of the first region extending from the second region.

5. The insulating sheet is provided separated into the first region and the second region, The battery pack according to claim 2, wherein the adhesive member is integrally folded and attached to the second surface of the insulating sheet in the first region and the insulating sheet in the second region.

6. The battery pack according to claim 5, wherein the double-sided tapes are attached separately to the first surface of each of the separated insulating sheets, corresponding to each of the insulating sheets.

7. The insulating sheet is provided in the first region and the second region, The battery pack according to claim 2, wherein the double-sided tape is attached to the first surface and the second surface of the insulating sheet.

8. The battery pack according to claim 7, wherein the space between the insulating sheet provided in the first region and the insulating sheet provided in the second region is cut in the form of dots.

9. The battery pack according to claim 8, wherein the double-sided tape on the first surface of the insulating sheet is cut in a manner corresponding to the shape of the dots on the insulating sheet.

10. The battery pack according to claim 7, wherein a notch structure is formed between the insulating sheet provided in the first region and the insulating sheet provided in the second region.

11. The battery pack according to claim 10, wherein the double-sided tape on the first and second surfaces of the insulating sheet has a notched structure formed on it corresponding to the notched structure of the insulating sheet.

12. The battery pack according to claim 1, wherein the outer end of the insulating portion provided in the second region is located on the same line as or lower than the upper side of the room portion.

13. The battery pack according to claim 1, wherein the end of the insulating portion provided in the first region protrudes compared to the end of the terrace portion.

14. The battery pack according to claim 1, further comprising a protective member that surrounds one surface of the terrace portion and at least one surface of the protective circuit module.

15. The battery pack according to claim 1, wherein the protection circuit module further includes a connector for electrically connecting the battery pack to an external device.

16. The battery pack according to claim 1, wherein the protection circuit module is arranged such that a charge / discharge protection device mounted on the protection circuit module faces the terrace portion.

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