KR102285642B1 - Battery Cell Comprising Electrode Lead Facing Outer Surface of Electrode Assembly - Google Patents

Abstract

The present invention relates to a battery cell in which an electrode lead with improved stability for solving an abnormal state caused by the energy density and/or non-uniformity of the active material of the battery cell during charging and discharging of the pouch-type battery cell is located on the surface, and it occupies a lot of space in the electrode lead. There is an effect that can exclude a drop in energy density and that the space utilization is improved because the protruding part is eliminated by locating the electrode lead on the surface of the battery cell.

Description

Battery Cell Comprising Electrode Lead Facing Outer Surface of Electrode Assembly

The present invention relates to a battery cell in which an electrode lead is located on a surface, and more particularly, the present invention has stability for solving an abnormal state caused by the energy density of the pouch-type battery cell and/or the non-uniformity of the active material of the battery cell during charging and discharging. An improved electrode lead relates to a battery cell located on the surface.

Due to the rapid increase in the use of fossil fuels, the demand for the use of alternative energy or clean energy is increasing. Currently, a secondary battery is a representative example of an electrochemical device using such electrochemical energy, and its use area is gradually expanding.

Recently, as technology development and demand for portable devices such as portable computers, portable phones, and cameras increase, the demand for secondary batteries as an energy source is rapidly increasing. A lot of research has been done on lithium secondary batteries, which have been commercialized and widely used.

The electrode assembly embedded in the battery case is a charging/discharging power generating element composed of a stacked structure of positive electrode/separator/negative electrode, and is a jelly-roll type, wound with a separator between the positive electrode and the negative electrode of a long sheet type coated with an active material. It is classified as a stack type in which a plurality of positive and negative electrodes of different sizes are sequentially stacked with a separator interposed therebetween. As an electrode assembly with an advanced structure, which is a mixture of such jelly-roll type and stack type, a full cell or positive electrode (cathode)/separator/negative electrode (positive electrode)/separator/ A stack/folding type electrode assembly having a structure in which a bicell having a positive (cathode) structure is folded using a long-length continuous separator film has been developed.

Meanwhile, among these secondary batteries, lithium secondary batteries are lighter in weight and higher in energy density than other secondary batteries, so demand is increasing. In particular, in a prismatic battery, the volume occupied by the electrode tab protruding to the outside of the electrode assembly in which the plurality of electrode plates and separators are stacked and the volume occupied by the electrode lead protruding outwardly connected to the electrode tab are the volumes of the secondary battery. Excessive increase causes a decrease in energy density. Furthermore, there is a problem of forming an unnecessary wasted dead space inside the device in which the secondary battery is mounted.

Such a secondary battery includes a secondary battery composed of a unidirectional or bidirectional electrode terminal, but in a bidirectional electrode terminal, the positive and negative electrode tabs of the electrode assembly are formed on opposite surfaces of the electrode assembly, and then the electrode leads are connected to the electrode tab. to form an electrode terminal. In the case of a bidirectional cell, when a battery pack is configured, the energy density is lowered because it occupies more space than a unidirectional cell.

In Korean Patent Laid-Open Publication No. 2006-0033643 (2006.04.19), a plurality of positive and negative electrode plates having tabs formed on one side are arranged on a separator and then sequentially folded to obtain a laminate in which the positive and negative tabs are independently overlapped with each other , aligning a lead wire on the tab after attaching the negative electrode tab and the positive electrode tab to one side, bonding the lead wire and the tab with a rivet, and bending the riveted tab and the lead wire to complete the cell. Disclosed is a method for treating electrode tabs in a stacked lithium secondary battery. However, it is not possible to check the configuration including the lead bent in the height direction of the electrode assembly while placing the lead on the surface of the electrode assembly.

Korean Patent Application Laid-Open No. 2016-0042798 (2016.04.20) discloses an electrode assembly in which one or more electrode plates and separators are alternately stacked, and an electrode tab protruding from the electrode plate and the electrode by a tab-lead coupling part Disclosed is an electrode assembly comprising an electrode lead electrically connected to the tab, wherein the electrode tab is in a bent state. However, although the configuration in which the lead is positioned on the stacked surface of the electrode assembly and the bent electrode tab are the same, the lead bent in the spatial direction cannot be confirmed.

Korean Patent Publication No. 2007-0096651 (2007.10.02) discloses a first electrode plate having a first electrode tab, a second electrode plate having a second electrode tab, and the first electrode plate and the second electrode plate In the electrode assembly for a cylindrical lithium secondary battery including a separator interposed therebetween, the second electrode tab is formed to protrude below the electrode assembly, one end is attached to the first electrode plate, and the other end is the Disclosed is an electrode assembly for a cylindrical lithium secondary battery, characterized in that it is extended to be positioned on the outer peripheral surface of the electrode assembly. However, although the bent lead and the lead positioned on the electrode surface are disclosed, there is a difference in that it relates to a jelly-roll-type electrode assembly.

Therefore, there is no battery cell technology including a structure for increasing energy density through space utilization by forming electrode leads on the surface of the electrode assembly.

Korean Patent Publication No. 2006-0033643 (2006.04.19) Korean Patent Publication No. 2016-0042798 (2016.04.20) Korean Patent Publication No. 2007-0096651 (2007.10.02)

An object of the present invention is to provide a battery cell that increases the energy density of a pouch-type battery cell.

Another object of the present invention is to provide a battery cell in which an unnecessary dead space occupied by a tab-lead coupling portion and an electrode lead in a battery is reduced because the electrode lead does not protrude to the outside of the electrode assembly.

Another object of the present invention is to provide a battery cell capable of increasing the usability of an internal space of a device in which a plurality of battery cells are embedded.

The present invention has been devised to solve the problems of the prior art as described above, and is a battery in which an electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween is built in a pouch-type cell case, and is formed from a plurality of electrode plates. the outwardly projecting electrode tabs are coupled to the first lead end of the electrode lead; a second lead end, which is an end opposite to the first lead end, is located on the outer surface of the cell case in a state parallel to the stacking direction of the electrode plates; The lead body between the first lead end and the second lead end is positioned to face the outer surface of the electrode assembly while maintaining a state parallel to the stacking direction of the electrode plates, and is positioned on the outermost surface of the case while the lead body of the lead body It provides a battery cell comprising a planar lead formed on the outer surface.

In addition, the cell case is made of a laminate sheet including a metal layer and a resin layer, and the outer periphery can be sealed by thermal fusion.

In addition, one end of the lamination sheet may be fixed to one end of the electrode lead located on the outer surface of the cell case, and the other end of the lamination sheet may be fixed to one end of the planar lead.

In addition, the electrode lead and the planar lead may be electrically in surface contact.

In addition, the planar lead may be formed on both sides of the battery cell.

In addition, a separator may be interposed between the lead body and the outermost surface of the electrode assembly.

In addition, the electrode tabs and the coupling portion of the first lead and/or the second lead end may be vertically bent 90 degrees to face the side surface of the electrode assembly.

In addition, the size of the flat lead located on the outer surface of the cell case in a state parallel to the stacking direction of the electrode plates may be in the range of 10% to 95% based on the planar size of the outermost surface of the cell case where the flat lead is located. there is.

In addition, the thickness of the planar lead may be 5 to 1000 μm.

In addition, the planar lead is platinum (Pt), gold (Au), palladium (Pd), iridium (Ir), silver (Ag), ruthenium (Ru), nickel (Ni), stainless steel (STS), aluminum (Al) ), copper (Cu), molybdenum (Mo), chromium (Cr), carbon (C), titanium (Ti), tin (Sn), tungsten (W), ITO (In doped SnO2), FTO (F doped) SnO2), and alloys thereof, and carbon (C), nickel (Ni), titanium (Ti) or silver (Ag) may be surface-treated on the surface of aluminum (Al), copper (Cu) or stainless steel.

In addition, it may be a battery module including two or more of the battery cells.

In addition, in the battery module, the battery cells may be stacked in a structure in which outer surfaces of the cell case in which the planar leads are positioned face each other.

In addition, the battery cells arranged in a stack may be in physical contact with each other in a non-welded state.

In addition, it may be a device comprising a battery cell.

In addition, the device may be selected from the group consisting of an electronic device, an electric vehicle, a hybrid vehicle, and a power storage device.

According to the battery cell in which the electrode lead is located on the surface according to the present invention, it is possible to exclude a decrease in energy density by occupying a large amount of space in the electrode lead.

In addition, the present invention has the effect of improving the space utilization by eliminating the protruding portion by locating the electrode lead on the surface of the battery cell.

In addition, in the present invention, when two or more battery cells constitute a battery module or device, there is an effect that a battery module configuration without welding is possible.

In addition, the present invention has the effect that the space utilization is easy as much as the protruding length of the electrode lead of the battery cell.

1 is a view showing an exemplary conventional bidirectional stacked pouch type secondary battery.
2 is a cross-sectional view showing a battery cell in which a planar lead is formed according to an embodiment of the present invention.
3 is a cross-sectional view showing bending of an electrode lead of a battery cell having planar leads according to an embodiment of the present invention.
4 is a cross-sectional view showing a battery cell in which a planar lead is formed according to an embodiment of the present invention.
5 is a schematic diagram of a battery module composed of battery cells in which planar leads are formed according to an embodiment of the present invention.

Hereinafter, embodiments in which those skilled in the art 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 describing the operating principle of a 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 a part is said to be 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 a certain component does not exclude other components unless otherwise stated, but means that other components may be further included.

The present invention will be described with detailed embodiments according to the drawings.

(Comparative example)

1 is a view showing an exemplary conventional bidirectional stacked pouch type secondary battery.

In general, in manufacturing a lithium secondary battery, first, a material in which an active material, a binder, and a plasticizer are mixed is applied to a positive electrode current collector and a negative electrode current collector to prepare a positive electrode plate and a negative electrode plate, and by laminating them on both sides of a separator, a battery cell having a predetermined shape After forming the battery cell, the battery pack is completed by inserting the battery cell into the battery case, injecting the electrolyte, and sealing the battery.

The structure of an electrode lead connected to a typical electrode assembly has one end connected to the electrode assembly and the other end exposed to the outside of the battery case, and around the electrode assembly. The present and enclosing battery case has a structure of an electrode lead that is sealed by an adhesive layer made of a sealant at a portion where the electrode lead extends to the outside of the battery case.

In addition, the electrode assembly is provided with an electrode tab. The current collector plate of the electrode assembly is composed of a portion to which an electrode active material is applied and an end portion to which an electrode active material is not applied (hereinafter, abbreviated as "uncoated portion"), and the electrode tab is formed by cutting the uncoated area or ultrasonic waves in the uncoated area. It may be a separate conductive member connected by welding or the like. As shown, the electrode tabs may protrude in one direction or in both directions so as to be formed side by side on the electrode assembly to face each other.

The electrode tab serves as an electron movement path inside and outside the battery, and the electrode lead is connected to the electrode tab by spot welding or the like. The electrode leads may extend in the same direction or in opposite directions depending on the formation positions of the positive electrode tab and the negative electrode tab. The material of the positive lead and the negative lead may be different from each other. That is, the positive lead may be made of the same aluminum (Al) material as the positive electrode plate, and the negative lead may be made of the same copper (Cu) material as the negative electrode plate or copper (Ni) coated copper material. Finally, the electrode lead is electrically connected to the external terminal through the terminal part.

The pouch case receives and seals the electrode assembly so that a part of the electrode lead, that is, the terminal portion is exposed. An adhesive layer, such as the aforementioned sealant, is interposed between the electrode lead and the pouch case.

In the unidirectional type of electrode terminal, after the positive and negative electrode tabs of the electrode assembly are formed in the same direction, an electrode lead is connected to the electrode tab to form an electrode terminal.

In the case of a unidirectional cell, there are disadvantages in terms of lifespan due to heat generation on the electrode lead side and non-uniformity in the use of the active material of the cell during charging and discharging.

In the bi-directional electrode terminal, after the positive and negative electrode tabs of the electrode assembly are formed on opposite surfaces of the electrode assembly, an electrode lead is connected to the electrode tab to form an electrode terminal.

In the case of a bidirectional cell, when a battery pack is configured, it occupies more space than a unidirectional cell, and thus energy density is lowered.

The pouch includes a gas barrier layer and a sealant layer. And it may further include a surface protective layer as an outermost layer formed on the gas barrier layer. The gas barrier layer is intended to block gas ingress, and an aluminum thin film (Al foil) is mainly used. The sealant layer is located in the innermost layer and is in contact with the contents, that is, the cell. And, the surface protective layer is mainly nylon (Nylon) resin is used in consideration of abrasion resistance and heat resistance. The pouch is manufactured by processing the film of the laminate structure as above in the form of a bag, and cell components such as anode, cathode, and separator are impregnated with electrolyte and then embedded. After the cell components are embedded in this way, the sealant layers are thermally bonded and sealed at the entrance of the pouch. In this case, since the sealant layer is in contact with the cell component, it must have insulation properties, electrolyte resistance, etc., and also must have high sealing properties for sealing with the outside. That is, the sealing portion where the sealant layers are thermally bonded should have excellent thermal bonding strength. In general, a polyolefin-based resin such as polypropylene (PP) or polyethylene (PE) is used for the sealant layer. In particular, polypropylene (PP) has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact resistance and electrolyte resistance, and is mainly used as a sealant layer for pouches.

The negative electrode is pre-welded with electrode tabs from all bicells. The positive electrode is pre-welded to the outermost electrode connected from the opposite direction to the negative electrode or two electrode tabs connected by foil. The part to which the positive electrode is connected may be used as an electrode by performing single-sided coating to constitute the outermost shell of the folded battery cell, or may be composed of a metal foil such as aluminum foil and positioned on the outer shell of the folded battery cell.

The pouch-type secondary battery may further include a lead film. The lead film is attached to a predetermined position where the electrode tab is in contact with the pouch to insulate and seal the between the pouch and the electrode tab. Since the pressure of the pouch is relatively high at the portion in contact with the electrode tab during the sealing process, the possibility of damage to the casted polypropylene (CPP) layer of the pouch membrane is increased. Therefore, when the pouch is fused and sealed under heat and pressure, the inner layer of the lead film imparts mechanical strength and heat resistance to maintain the shape of the lead film to maintain electrical insulation between the pouch and the electrode tab. In particular, the inner layer of the insulating tape prevents electrical contact with the electrode tab even if the aluminum thin film of the pouch is partially exposed during the sealing process, thereby maintaining insulation. The outer layer of the insulating tape provides an adhesive force between the pouch and the electrode tab even if the shape is partially deformed under heat and pressure to maintain the sealing. Therefore, in the sealing process of the pouch, the casted polypropylene (CPP) layer of the pouch is deformed by heat and pressure, so that the sealing can be maintained even when the aluminum thin film is partially exposed.

2 is a cross-sectional view showing a battery cell in which a planar lead is formed according to an embodiment of the present invention.

Referring to FIG. 2 , electrode leads stacked on the outermost surface of the electrode assembly 120 in a state parallel to the stacking direction of the electrode plates are shown. The positive electrode tabs 121 and the negative electrode tabs 122 of the electrode assembly end protruding in the outwardly protruding direction are the positive electrode lead 124 and the negative electrode lead 125, respectively, and are electrically connected to the electrode assembly through this. In addition, the anode face lead 126 and the cathode face lead 127 are connected to the anode lead 124 and the cathode lead 125, and are manufactured to be like the anode face lead 126 and the cathode face lead 127 in the mold. Alternatively, the anode lead 124 and the cathode lead 125 are deformed with a mold in the form of the anode lead 124 and the cathode lead 125 to form a lead protruding part such as the anode on-plane lead 126 and the cathode-on-plane lead 127. It is possible to manufacture, and as another configuration method, the anode-on-side lead 126 and the cathode-on-surface lead 127 separate lead parts are attached to the lead connecting the tabs such as the anode lead 124 and the cathode lead 125 in various ways. There is a way.

An end of the electrode lead protruding in an outward direction of the electrode tabs of the electrode assembly is referred to as a first lead end. The electrode assembly is electrically connected through the first lead end. An end of the electrode lead opposite to the end of the first lead becomes a second lead end.

3 is a cross-sectional view showing bending of an electrode lead of a battery cell having planar leads according to an embodiment of the present invention.

3 is a cross-sectional view showing a structure in which an anode lead and a cathode lead are respectively stacked on the outermost surface of the electrode assembly. The positive electrode lead and the negative electrode lead are stacked on different outermost surfaces of the electrode assembly, and the positive electrode tab and the negative electrode tab protrude outward in opposite directions with respect to the electrode assembly and are coupled to the end of the positive lead and the end of the negative lead, respectively. there is. By vertically bending the end of each electrode lead by 90 degrees to face the side surface of the electrode assembly, the dead space (S) formed by the protruding shape of the electrode tab and the electrode lead can be significantly reduced, and thus the volume of the battery cell Contrast battery capacity can be increased.

4 is a cross-sectional view showing a battery cell in which a planar lead is formed according to an embodiment of the present invention.

It consists of a positive electrode lead, a negative electrode lead, and a lamination sheet 131 respectively positioned on the outermost surface of the electrode assembly in a direction parallel to the electrode plates of the electrode assembly. The laminate sheet does not cover the front surface of the electrode assembly, and one end of the laminate sheet is fixed by the lead body of the positive electrode lead and the electrode lead end, and the opposite end is fixed by the lead body of the electrode assembly and the negative electrode lead. Similarly, one end of the laminate sheet is fixed by the lead body and the lead end of the other laminate sheet, and the opposite end is fixed by the electrode assembly and the lead body of the positive electrode lead. The non-fixed end of the laminate sheet 131 is heat-sealed to seal the electrode assembly to manufacture a cell case.

The lamination sheet is laminated on the positive electrode lead 124 and the negative electrode lead 125, respectively, but the laminated sheet cannot be formed up to the anode side lead 126 or the negative electrode side lead 127. After the lamination process, The thickness of the laminated sheet does not exceed the thickness of the lead on the anode side 126 or the lead on the cathode side 127 .

One end of the electrode lead is horizontally bent, and the other end is formed to face the outermost surface of the electrode assembly while maintaining a state parallel to the stacking direction of the electrode plates. A planar lead is formed to face the other surface of the electrode lead facing the outermost surface of the electrode assembly. One end of the positive or negative laminate sheet serving as a cell case is fixed between the electrode lead body and the electrode end, and the positive or negative laminate sheet surrounds the outer surface of the electrode assembly and the opposite end of the fixed end is the electrode assembly and It is fixed between the electrode lead body. The remaining non-fixed ends of the anode or cathode laminate sheet are sealed by thermal fusion to form a cell case.

5 is a schematic diagram of a battery module composed of battery cells in which planar leads are formed according to an embodiment of the present invention.

By stacking and arranging the battery cells 100 , 200 , and 300 according to the present invention so that the outer surfaces of the cell cases in which the electrode leads of the respective battery cells are located face each other, the electrode leads exposed on the outer surfaces are in contact and are electrically connected to the battery module (1000) is shown. The electrode leads are kept in contact by the weight of the stacked battery cells themselves, and further, when the case of the battery module is manufactured in a shape corresponding to the stacked structure of the battery cells, the flow of the battery cells is prevented and the electrode leads are maintains a state of being connected to each other, so there is no need for a welding process to interconnect the electrode leads of the battery cells.

In addition, the planar lead may be configured to surround a predetermined surface of the electrode assembly.

In addition, a coating layer may be formed on one surface of the planar lead.

In addition, the coating layer may be made of any one or two or more of thermoplastic, thermosetting, and photocurable resins having electrical insulation properties.

The polymer resin uses a thermoplastic, thermosetting, and photo-curable resin having electrical insulation properties, and examples thereof include styrene-butadiene resin, styrene resin, epoxy resin, urethane resin, acrylic resin, phenol resin, amide-based resin, acrylate-based resin, and the modified resins may be selected and used, and two or more types may be mixed and used as needed. Among the polymer resins, the thermoplastic resin is an elastomer serving as a matrix supporting film formation, and preferably has a softening point of about 100 to 180° C., and may be used in an amount of 20 to 80 vol% of the entire polymer resin.

The polymer resin is a thermosetting polymer resin, and at least one of acrylic resin, epoxy resin, EPDM (Ethylene Propylene Diene Monomer) resin, CPE (Chlorinated Polyethylene) resin, silicone, polyurethane, urea resin, melamine resin, phenol resin, and unsaturated ester resin contains more than one.

Most preferably, an acrylic resin is used as a thermosetting polymer resin.

The thickness of the coating layer may be 10 to 500 μm, preferably 15 to 300 μm. If it is out of the thickness range, normal insulation performance cannot be maintained.

In addition, the thickness of the planar lead may be 5 to 1000 μm.

The thickness of the planar lead may be 10 to 2000 μm, preferably 15 to 1000 μm. More preferably, it may be 30 to 500 μm. If it is out of the thickness range, normal conductivity and heat dissipation performance cannot be maintained.

In addition, the planar lead may be a metal made of gold, silver, copper, aluminum, and an alloy thereof.

In addition, the planar lead may be a substrate having a metal layer formed on one surface thereof.

In addition, the coating layer may be coated with a positive electrode or a negative electrode active material.

The positive active material includes lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium cobalt-nickel oxide, lithium cobalt-manganese oxide, lithium manganese-nickel oxide, lithium cobalt-nickel-manganese oxide, lithium iron phosphate oxide having an olivine structure. Any one or two or more lithium-containing metal oxides selected from the group consisting of , spinel-structured lithium manganese oxide, and oxides in which other element(s) are substituted or doped may be used. Here, the elliptical element may be any one or two or more elements selected from the group consisting of Al, Mg, Mn, Ni, Co, Cr, V, and Fe.

The negative active material is lithium metal, a lithium alloy (eg, lithium and an alloy of a metal such as aluminum, zinc, bismuth, cadmium, antimony, silicon, lead, tin, gallium or indium), amorphous carbon, crystalline carbon, carbon composite, SnO2 or the like may be used, but is not necessarily limited thereto.

The substrate may be any one or two or more of a glass substrate, a resin substrate, and a metal substrate.

The planar lead is a metal precursor metal for forming the metal layer is gold (Au), platinum (Pt), silver (Ag), copper (Cu), aluminum (Al), lithium (Li), sodium (Na), potassium ( K), rubidium (Rb), cesium (Cs), beryllium (Be), magnesium (Mg), calcium (Ca), or a combination thereof.

The metal precursor catalyst is titanium isopropoxide (Ti(Oi-Pr) ₄ , titanium chloride (TiCl ₄ ), platinum (Pt)-based catalyst, cobalt (Co)-based catalyst, nickel (Ni)-based catalyst, manganese (Mn) )-based catalysts and zinc (Zn)-based catalysts may be any one or two or more.

The metal precursor may be a metal hydride, a complex of the metal hydride and an ether or amine-based material; or a combination thereof.

The metal precursor is _{AlH 3, LiH, NaH, KH} , RbH, CsH, BeH 2, MgH 2, CaH 2, SrH 2, OAlH 3 (C 2 H 5) 2, OAlH 3 (C 3 H 7) 2, OAlH ₃ (C ₄ H ₉ ) ₂ ,AlH ₃ NMe ₃ ,AlH ₃ NEt ₃ ,AlH ₃ NEt ₂ Me,AlH ₃ NMe ₂ Et,AlH ₃ Dioxane, AlH ₃ S(C _{2 )} H ₅ ) ₂ ,AlH ₃ S(C ₄ H ₉ ) ₂ ,AlH ₃ S(C ₄ H ₉ ) ₂ ,AlH ₃ C ₉ H ₁₂ ,OLiH(C ₂ H ₅ ) ₂ ,OLiH(C ₃ H ₇ ) ₂ ,OLiH(C ₄ H ₉ ) ₂ ,LiH NMe ₃ ,LiH NEt ₃ ,LiH NEt ₂ Me,LiH NMe ₂ Et,LiH dioxane, LiHS(C ₂ H ₅ ) ₂ , LiHS(C ₄ H ₉ ) ₂ ,LiHS(C ₄ H ₉ ) ₂ ,LiHC ₉ H1 ₂ ,ONaH(C ₂ H ₅ ) ₂ ,ONaH(C ₃ H ₇ ) ₂ ,ONaH(C ₄ H ₉ ) ₂ , NaH NMe ₃ , NaH NEt ₃ , NaH NEt ₂ Me, NaH NMe ₂ Et, NaH Dioxane, NaHS(C ₂ H ₅ ) ₂ , NaHS(C ₄ H ₉ ) ₂ , NaHS( C ₄ H ₉ ) ₂ ,NaHC ₉ H ₁₂ ,OKH(C ₂ H ₅ ) ₂ ,OKH(C ₃ H ₇ ) ₂ ,OKH(C ₄ H ₉ ) ₂ ,KH NMe ₃ ,KH NEt ₃ ,KH NEt ₂ Me,KH NMe ₂ Et,KH dioxane, KHS(C ₂ H ₅ ) ₂ ,KHS(C ₄ H ₉ ) ₂ ,KHS(C ₄ H ₉ ) ₂ ,KHC ₉ H ₁₂ ,ORbH(C ₂ H ₅ ) ₂ ,ORbH(C ₃ H ₇ ) ₂ ,ORbH(C ₄ H ₉ ) ₂ ,RbH NMe ₃ ,RbH NEt ₃ ,RbH NEt ₂ Me,RbH NMe ₂ Et, RbH Dioxane (dioxane), RbHS (C ₂ H ₅ ) ₂ , RbHS (C ₄ H ₉ ) ₂ ,RbHS(C ₄ H ₉ ) ₂ ,RbHC ₉ H ₁₂ ,OCsH(C ₂ H ₅ ) ₂ ,OCsH(C ₃ H ₇ ) ₂ ,OCsH(C ₄ H ₉ ) ₂ ,CsH NMe ₃ ,CsH· NEt ₃ ,CsH NEt ₂ Me,CsH NMe ₂ Et,CsH Dioxane, CsHS(C ₂ H ₅ ) ₂ ,CsHS(C ₄ H ₉ ) ₂ ,CsHS(C ₄ H ₉ ) ₂ , CsHC ₉ H ₁₂ ,OBeH ₂ (C ₂ H ₅ ) ₂ ,OBeH ₂ (C ₃ H ₇ ) ₂ ,OBeH ₂ (C ₄ H ₉ ) ₂ ,BeH ₂ NMe ₃ ,BeH ₂ NEt ₃ ,BeH ₂ NEt ₂ Me,BeH ₂ NMe ₂ Et,BeH ₂ Dioxane, BeH ₂ S(C ₂ H ₅ ) ₂ ,BeH2S(C ₄ H ₉ ) ₂ ,BeH2S(C ₄ H ₉ ) ₂ ,BeHC ₉ H ₁₂ ,OMgH2(C ₂ H ₅ ) ₂ ,OMgH2(C ₃ H ₇ ) ₂ ,OMgH2(C ₄ H ₉ ) ₂ ,MgH ₂ NMe ₃ ,MgH ₂ NEt ₃ ,MgH ₂ NEt ₂ Me, MgH ₂ NMe ₂ Et,MgH2 Dioxane, MgH2S(C ₂ H ₅ ) ₂ ,MgH2S(C ₄ H ₉ ) ₂ ,MgH2S(C ₄ H ₉ ) ₂ ,MgHC ₉ H ₁₂ ,OCaH2(C ₂ H ₅ ) ₂ ,OCaH2(C ₃ H ₇ ) ₂ ,OCaH2(C ₄ H ₉ ) ₂ ,CaH ₂ NMe ₃ ,CaH ₂ NEt ₃ ,CaH ₂ NEt ₂ Me,CaH ₂ NMe ₂ Et, CaH ₂ Dioxane, CaH2S(C ₂ H ₅ ) ₂ , CaH2S(C ₄ H ₉ ) ₂ , CaH2S(C ₄ H ₉ ) ₂ ,CaHC ₉ H ₁₂ ,OSrH2(C ₂ H ₅ ) ₂ , OSrH2(C ₃ H ₇ ) ₂ ,OSrH2(C ₄ H ₉ ) ₂ ,SrH ₂ NMe ₃ ,SrH ₂ NEt ₃ ,SrH ₂ NEt ₂ Me,SrH ₂ NMe ₂ Et,SrH ₂ Dioxane ( dioxane), SrH ₂ S(C ₂ H ₅ ) ₂ , SrH ₂ S(C ₄ H ₉ ) ₂ , SrH ₂ S(C ₄ H ₉ ) ₂ , SrH ₂ C ₉ H ₁₂ , or a combination thereof.

In the case of the foil connection configuration, it is obvious that only one or both sides of the folded battery cell may be formed.

In addition, it may be a device comprising a pouch-type secondary battery.

In addition, the device may be selected from the group consisting of an electronic device, an electric vehicle, a hybrid vehicle, and a power storage device.

In the above, the present invention has been described in detail with reference to the described embodiments, but those of ordinary skill in the art to which the present invention pertains may make various substitutions, additions and modifications within the scope not departing from the technical spirit described above. As a matter of course, it should be understood that such modified embodiments also fall within the protection scope of the present invention as defined by the appended claims below.

100, 200, 300: battery cell
110: upper pouch
120: electrode assembly
121: positive electrode tab
122: negative electrode tab
123: lead film
124: positive lead
125: negative lead
126: anode face lead
127: lead on cathode plane
130: lower pouch
131: lamination sheet

Claims (15)

A battery in which an electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therein is built in a pouch-type cell case,
the electrode tabs protruding outward from the plurality of electrode plates are coupled to the first lead end of the electrode lead;
a second lead end, which is an end opposite to the first lead end, is located on the outer surface of the cell case in a state parallel to the stacking direction of the electrode plates;
The lead body between the first lead end and the second lead end is positioned to face the outer surface of the electrode assembly while maintaining a state parallel to the stacking direction of the electrode plates,
and a planar lead formed on the outer surface of the lead body while positioned on the outermost surface of the case,
The size of the flat lead located on the outer surface of the cell case in a state parallel to the stacking direction of the electrode plates is in the range of 10% to 95% based on the planar size of the outermost surface of the cell case where the flat lead is located. battery cell.
According to claim 1,
The cell case is made of a laminate sheet including a metal layer and a resin layer, the battery cell, characterized in that the outer periphery is sealed by heat sealing.
3. The method of claim 2,
One end of the laminate sheet is fixed to one end of the electrode lead located on the outer surface of the cell case, and the other end of the laminate sheet is fixed to one end of the planar lead.
According to claim 1,
The battery cell, characterized in that the electrode lead and the planar lead are electrically surface-contacted.
According to claim 1,
The planar lead is a battery cell, characterized in that formed on at least one surface of the battery cell.
According to claim 1,
A battery cell, characterized in that the separator is interposed between the lead body and the outermost surface of the electrode assembly.
The method of claim 1,
A battery cell, characterized in that the electrode tabs and the coupling portion of the first lead and/or the second lead end is vertically bent at 90 degrees to face the side surface of the electrode assembly.
delete According to claim 1,
A battery cell, characterized in that the thickness of the planar lead is 5 to 1000 μm.
According to claim 1,
The planar lead is platinum (Pt), gold (Au), palladium (Pd), iridium (Ir), silver (Ag), ruthenium (Ru), nickel (Ni), stainless steel (STS), aluminum (Al), Copper (Cu), molybdenum (Mo), chromium (Cr), carbon (C), titanium (Ti), tin (Sn), tungsten (W), ITO (In doped SnO ₂ ), FTO (F doped SnO) ₂ ), and alloys thereof, and carbon (C), nickel (Ni), titanium (Ti) or silver (Ag) on the surface of aluminum (Al), copper (Cu) or stainless steel battery cell.
A battery module comprising two or more battery cells according to any one of claims 1 to 7, 9 and 10.
12. The method of claim 11,
In the battery module, the battery cells are stacked and arranged in a structure in which outer surfaces of the cell case where the planar leads are located face each other.
12. The method of claim 11,
The stacked arrangement of the battery cells is a battery module, characterized in that the planar leads are in physical contact with each other in a non-welded state.
A device comprising a battery cell according to any one of claims 1 to 7, 9 and 10.
15. The method of claim 14,
The device is a device, characterized in that selected from the group consisting of an electronic device, an electric vehicle, a hybrid vehicle and a power storage device.

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