KR102285645B1 - Pouch Type Lithium Secondary Battery comprising Switch Type CID - Google Patents

Abstract

The present invention maintains battery safety due to volume expansion or overcharging such as swelling due to gas generated in an abnormal state of a pouch-type battery cell, and has a vibration-resistant characteristic that disperses external force when vibration occurs in a device including the battery cell It relates to a secondary battery including a switched-type CID with

Description

Pouch Type Lithium Secondary Battery comprising Switch Type CID}

The present invention relates to a secondary battery including a switched CID, and more particularly, the present invention maintains battery safety due to volume expansion or overcharging such as swelling due to gas generated in an abnormal state of a pouch-type battery cell, and It relates to a secondary battery including a switch-type CID having vibration-resistant characteristics for dispersing an external force when vibration is generated in a device including a battery cell.

In general, types of secondary batteries include a nickel cadmium battery, a nickel hydrogen battery, a lithium ion battery, and a lithium ion polymer battery. These secondary batteries are not only small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, Portable Game Devices, Power Tools, and E-bikes, but also large products requiring high output such as electric vehicles and hybrid vehicles and surplus batteries. It is also applied and used in power storage devices that store generated power or renewable energy and power storage devices for backup.

The lithium secondary battery is generally composed of a cathode, a separator, and an anode, and their materials are selected in consideration of battery life, charge/discharge capacity, temperature characteristics and stability. In general, A lithium secondary battery has been designed to have a three-layer structure of positive electrode/separator/negative electrode, or a five-layer structure of positive electrode/separator/negative electrode/separator/positive electrode or negative electrode/separator/positive electrode/separator/negative electrode. The unit cells are gathered to form one electrode assembly or a secondary battery.

The lithium secondary battery is charged and discharged while repeating the process of intercalation and deintercalation of lithium ions from the lithium metal oxide of the positive electrode into the graphite electrode of the negative electrode.

These secondary batteries have various problems that threaten the safety of secondary batteries, such as internal short circuit due to external impact, heat generation due to overcharge, overdischarge, etc., and electrolyte decomposition and thermal runaway. In particular, the explosion of a secondary battery originates from various causes, but an increase in the gas pressure inside the secondary battery due to electrolyte decomposition is also one of the causes. Specifically, when the secondary battery is repeatedly charged and discharged, gas is generated through an electrochemical reaction between the electrolyte and the electrode active material. At this time, the generated gas raises the internal pressure of the secondary battery, causing problems such as weakening of the fastening between parts, damage to the external case of the secondary battery, early operation of the protection circuit, deformation of the electrode, internal short circuit, and explosion.

In the case of such a battery, for the safety of the battery in an overcharging situation, the overcharging situation is suppressed by blocking the overcurrent through the control of the electronic component. As a method in which this method is applied to a battery, a protection circuit such as a PCM (Protection Circuit Module) may be exemplified. However, even if an overcharge protection circuit such as PCM is applied, it is difficult to sufficiently ensure safety, and in particular, in a pouch-type battery, there is a disadvantage that a stronger protection circuit structure needs to be applied to more accurately identify the swelling of the pouch cell.

In addition, in consideration of the malfunction of the electronic component, a mechanical current interrupt device (CID) that physically blocks the series connection of the battery using the pressure generated by thermal expansion of the battery during overcharging is applied. In general, a method for blocking current by physically disconnecting a series connection of a battery pack through a battery pack mechanism using only the expansion pressure of the battery generated in an overcharging situation is widely used as a current blocking device for a battery pack. However, a CID capable of breaking current through volume expansion of a pouch-type battery has not been proposed.

In Korea Patent Publication No. 1601135, a configuration in which a polymer material is inserted between the leads and the leads in bonding between the two lead plates of a pouch-type secondary battery. When the internal pressure caused by the gas generated inside the secondary battery exceeds a certain level, gas The configuration of the venting notch that can quickly discharge the is disclosed a configuration having the characteristics of insulation and heat-sealing properties that do not conduct electricity. However, it is not possible to confirm the configuration in which the conductive polymer is inserted between the electrode lead-lead or the lead-tab and the notch portion is formed in the film surrounding the electrode lead-lead or the lead-tab combination.

Korean Patent Application Laid-Open No. 2016-0125920 discloses a positive electrode assembly; and a pouch exterior material for accommodating the electrode assembly and comprising a first pouch portion and a second pouch portion, wherein the first pouch portion and the second pouch portion are adhered to each other by respective sealing portions. a first electrode lead extending from the electrode assembly and attached to the first pouch part; a second electrode lead attached to the second pouch part and formed to protrude to the outside of the pouch case; a first sealing member interposed between the first electrode lead and the second electrode lead to prevent the first electrode lead and the second electrode lead from contacting each other; and a film-type connecting member electrically connecting the first electrode lead and the second electrode lead. However, there is a difference from the present invention in that the sealing member does not have conductivity.

In Korean Patent Publication No. 1192077, an electrode assembly including a first electrode and a second electrode and a separator positioned between the first electrode and the second electrode, a case in which the electrode assembly is accommodated, and the first electrode are electrically connected to the first electrode. and a lead tab connected to the electrode terminal and a lead tab extending to the outside of the case within the case and electrically connected to the first electrode through the electrode terminal, wherein the lead tab is in contact with the case Further comprising an adhesive member formed to be separated from at least a portion of the electrode terminal so as to cut off the electrical connection from the first electrode when the case is deformed in the present state, and for bonding the lead tab to the electrode terminal, The adhesive member has a through hole, and the lead tab is formed to be electrically connected to the electrode terminal through the through hole. However, there is a difference in the configuration in which the insulating polymer is inserted between the electrode lead-lead or the lead-tab.

In Korean Patent Publication No. 1447064, an electrode assembly having a positive electrode/separator/negative electrode structure is a battery cell that is built into the housing of a battery case, and each electrode plate constituting the electrode assembly has a tab (electrode) not coated with an active material. tab) protrudes, and an electrode lead for electrically connecting the electrode tabs is located at one end where the electrode tabs are stacked. Disclosed is a battery cell characterized in that it forms a physical bond introduced into the electrode tabs. However, it is not possible to confirm the configuration in which the conductive polymer is inserted between the electrode lead-lead or the lead-tab and the notch portion is formed in the film surrounding the electrode lead-lead or the lead-tab combination.

Therefore, secondary battery technology including a switch, which short-circuits the secondary battery through an increase in internal pressure and volume expansion of the pouch-type battery due to gas generation, such as abnormal conditions such as gas generation due to overcharging and abnormality, is presented. does not exist.

Korean Patent Publication No. 1601135 Korean Patent Publication No. 2016-0125920 Korean Patent Publication No. 1192077 Korean Patent Publication No. 1447064

The main object of the present invention for solving the problems described above is an electrode tab and An object of the present invention is to provide a pouch-type secondary battery including a switch for securing safety in case of overcharging as a switch that conducts electricity by electrically connecting an electrode lead.

In addition, it is an additional object to provide a pouch-type secondary battery including a simple switch capable of maintaining the energy density of the battery cell, rather than a complicated additional device that can cut off the current in an abnormal state such as volume expansion of the battery cell.

Another object of the present invention is to provide a pouch-type secondary battery including a switch having improved vibration resistance by dispersing an external force applied to an electrode tab and/or an electrode lead when vibration is generated in a device to which the battery cell is applied.

The present invention has been devised to solve the conventional problems as described above, and is a pouch type housed in a pouch case including an electrode assembly, an electrode tab, an electrode lead, and an insulating layer, in which an anode and a cathode are stacked with a separator interposed therebetween In the secondary battery, it is possible to provide a pouch-type secondary battery including a switch having one surface in contact with the insulating layer and the other surface in contact with the electrode tab and/or electrode lead.

In addition, the switch may be more strongly coupled to the insulating layer than the electrode tab and/or the electrode lead.

In addition, the insulating layer may be heat-sealed to the pouch, the switch, the electrode tab and/or the electrode lead.

In addition, a surface of the switch in contact with the electrode tab and/or the electrode lead may be formed with irregularities.

In addition, the concave-convex cross section may have any one or two or more shapes of a triangle, a quadrangle, a polygon, and an amorphous shape.

The width (L) of the fixture is D _s ≤ L ≤ D _tf may be in the range of

In addition, one or more fixtures may be formed in contact with the outer surface of the pouch case at a portion where the switch and the insulating layer overlap.

In addition, the thickness of the switch may be 5 to 5000 μm.

In addition, the sum of the thickness of the fixed body and the switch may be smaller than the thickness of the electrode assembly.

In addition, the switch is present between the electrode tab and/or the electrode lead and the insulating layer in contact with the upper pouch adjacent thereto, and is an agent for blocking the conduction and vibration of the electrode tab and/or the electrode lead. 1 switch; and a second switch that is present between the electrode tab and/or the electrode lead and the insulating layer in contact with the lower pouch adjacent thereto, and blocks electricity and vibration of the electrode tab and/or the electrode lead. may include

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.

According to the secondary battery including the electrode lead using the conductive polymer according to the present invention, there is an effect of preventing the current from flowing through the pouch-type secondary battery due to not only overcharging but also in an abnormal state.

In addition, the present invention has an effect that can exclude a decrease in energy density when a complicated device is additionally applied to the pouch-type secondary battery.

In addition, the present invention has the effect of short-circuiting the electrode tab and/or the electrode lead through the gas expansion of the pouch-type secondary battery.

In addition, the present invention has the effect of improving the vibration resistance by dispersing the external force during vibration of the device to which the secondary battery is applied.

1 is a view showing an exemplary conventional pouch-type battery cell.
2 is a view showing the volume expansion of an exemplary pouch-type battery cell due to gas generation.
3 is a view of a pouch-type secondary battery in which a switch is formed in an electrode tab and an electrode lead connection portion according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a short circuit of an electrode tab and an electrode lead connection unit by a switch according to internal expansion according to an embodiment of the present invention.
5 is a view of a pouch-type secondary battery in which a switch is formed in an electrode lead connection portion according to an embodiment of the present invention.
6 is a cross-sectional view illustrating a short circuit of an electrode lead connection unit by a switch according to internal expansion 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.

1 is a view showing an exemplary conventional pouch-type battery cell.

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. The pouch case has a sealing area on the edge, and the horizontal slit of the electrode lead is spaced apart from the sealing area toward the joint. That is, when the electrode lead is in an inverted T-shape, the leg portion of the T-shaped protrudes to the outside of the pouch case, and a part of the head of the T-shaped is formed in the sealing area.

Usually, aluminum material is used for the positive electrode current collector plate and copper material is used for the negative electrode current collector plate. Since copper foil tends to rupture more easily than aluminum foil when swelling occurs, the possibility of rupture of the negative lead is higher than that of the positive electrode. can In such a case, it may be desirable to form the negative lead with such a breakable electrode lead.

In the normal state of the secondary battery, the electrode assembly is blocked from the outside by the adhesive layer, and when the pressure inside the battery rises due to causes such as overcharging, high temperature, etc., expansion of the battery case will be induced, but only a weak part of the battery case or other components. The weak junction of the element will rupture and the gas inside the cell will be evacuated.

However, since the current from the battery will continue to flow as long as the electrode assembly and the electrode lead are electrically connected, it is still very difficult to ensure the stability of the battery. In order to solve this problem, a method of adjusting the amount of electrolyte injected into the secondary battery or adjusting the short-circuit pressure of the current blocking member (CID) is used, but this has a problem in that the safety of the battery is deteriorated during overcharging. That is, it is not easy to simultaneously solve the safety of the battery during overcharging and the stability of use due to the use of the battery in a high-temperature environment.

(Comparative example)

2 is a view showing the volume expansion of an exemplary pouch-type battery cell due to gas generation.

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.

However, the pouch-type secondary battery according to the prior art has a problem in that there is no stability against the risk of explosion. In general, cells generate heat and pressure in the process of generating/discharging (charging/discharging) electricity (redox reaction, etc.). there is. It can explode with such high heat and pressure, but the conventional pouch-type secondary battery has a problem in that it is exposed to the risk of explosion because technical means for preventing the above risk of explosion cannot be devised.

(Example)

3 is a view of a pouch-type secondary battery in which a switch is formed in an electrode tab and an electrode lead connection portion according to an embodiment of the present invention.

The switch of FIG. 3 is formed to connect the electrode tab and the electrode lead. One side of the switch is in contact with one end of the electrode tab and the electrode lead, and the other side is in contact with the insulating layer. The switch is strongly coupled to the insulating layer and weakly coupled to the electrode tab and the electrode lead. The switch and the insulating layer may be heat-sealed.

One side of the insulating layer is in contact with the switch and the other side is in contact with the pouch. The insulating layer is strongly coupled to the switch and the pouch. The insulating layer, the switch, and the pouch may be heat-sealed.

The insulating layer may be formed while surrounding any one or more of an electrode tab, an electrode lead, and a switch.

The thickness of the insulating 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 switch may be 5 to 5000 μm.

The thickness of the switch may be 100 to 4000 μm, preferably 150 to 3000 μm. Deviating from the above thickness range may adversely affect normal conductivity, heat dissipation performance, and energy density.

The switch is operated to short-circuit the electrode tab and/or the electrode lead when the internal pressure of the pouch is 1.5 to 3 atmospheres.

It is apparent that the fixture serves to maintain a withstand pressure condition for the operation of the switch, and the operation required pressure condition can be changed according to the operating condition of the pouch-type secondary battery.

In addition, the switch 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.

The switch may be a substrate having a metal layer formed on one surface thereof.

A coating layer may be formed on one surface of the switch.

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

Additionally, a fixing body may be formed on the outside of the pouch in order to have vibration resistance in a vibration environment of a device including the secondary battery.

The fixture may be an insulator. The insulator may be a metal or non-metal body coated with an insulating polymer on the outside.

The fixing body may be formed in a portion in contact with the outer surface of the pouch case where the switch and the insulating layer overlap.

4 is a cross-sectional view illustrating a short circuit of an electrode tab and an electrode lead connection unit by a switch according to internal expansion according to an embodiment of the present invention.

The secondary battery is short-circuited according to the expansion of the pouch due to generation of internal gas, temperature rise, and pressure increase, which are abnormal states of the secondary battery.

Looking at the short circuit of the secondary battery in time series, first, the pouch expands due to gas generation and internal pressure increase due to the abnormal state of the secondary battery, and the insulating layer strongly coupled to the pouch is deformed according to the expansion of the pouch. , at this time, the connection portion of the electrode tab and the electrode lead is physically shorted while moving away from the switch in which the coupling is relatively directed.

Additionally, when the device including the secondary battery is formed in a vibration environment (eg, a hybrid vehicle, an electric vehicle, etc.), a fixture may be additionally installed to exclude an abnormal state of the secondary battery due to vibration. The fixture imparts vibration resistance characteristics to the secondary battery in a vibration environment, and the switch is short-circuited to prevent gas generation in the pouch, increase in internal pressure, and explosion due to temperature rise due to an abnormal state of the secondary battery. can be adjusted.

5 is a view of a pouch-type secondary battery in which a switch is formed in an electrode lead connection portion according to an embodiment of the present invention.

6 is a cross-sectional view illustrating a short circuit of an electrode lead connection unit by a switch according to internal expansion according to an embodiment of the present invention.

The pouch-type secondary battery may further include an insulating layer. The insulating layer is attached to a predetermined position where the electrode tab is in contact with the pouch to insulate and seal 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 insulating layer provides mechanical strength and heat resistance to maintain the shape of the insulating layer 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.

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

In addition, the insulating layer may include at least one of polypropylene (PP), polyethylene (PE), polyimide (PI), and polyamide.

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 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 with a metal such as aluminum, zinc, bismuth, cadmium, antimony, silicon, lead, tin, gallium or indium), amorphous carbon, crystalline carbon, carbon composite, SnO ₂ and the like may be used, but is not necessarily limited thereto.

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: battery cell
110: upper pouch
120: electrode assembly
121: positive electrode tab
122: negative electrode tab
123: insulating layer
124: positive lead
125: negative lead
126: switch
127: fixed body
128: uneven
130: lower pouch

Claims (12)

An electrode assembly, an electrode tab, in which an anode and a cathode are stacked with a separator interposed therebetween;
In the pouch-type secondary battery accommodated in a pouch case comprising an electrode lead and an insulating layer,
One side is in contact with the insulating layer and the other side includes a switch in contact with the electrode tab and/or the electrode lead,
A pouch-type secondary battery, characterized in that at least one fixing body is formed in contact with the outer surface of the pouch case where the switch and the insulating layer overlap.
According to claim 1,
The switch is a pouch type secondary battery, characterized in that it is strongly coupled to the insulating layer than the electrode tab and/or the electrode lead.
According to claim 1,
The insulating layer is a pouch type secondary battery, characterized in that the heat-sealed to the pouch, the switch, the electrode tab and / or the electrode lead.
According to claim 1,
A surface of the switch in contact with the electrode tab and/or the electrode lead has irregularities formed therein.
5. The method of claim 4,
The concave-convex cross-section is a pouch-type secondary battery, characterized in that it has any one or two or more shapes of a triangle, a square, a polygon, and an amorphous shape.
delete The method according to claim 1,
The width (L) of the fixing body is a pouch-type secondary battery, characterized in that in the range of _{D s} ≤ L ≤ D _tf.
According to claim 1,
The thickness of the switch is a pouch-type secondary battery, characterized in that 5 to 5000 μm.
According to claim 1,
A pouch-type secondary battery, characterized in that the sum of the thickness of the fixed body and the switch is smaller than the thickness of the electrode assembly.
According to claim 1,
The switch is present between the electrode tab and/or the electrode lead and the insulating layer in contact with the upper pouch adjacent thereto, and is a first switch that blocks electricity and vibration of the electrode tab and/or the electrode lead. ; and
A second switch that exists between the electrode tab and/or the electrode lead and the insulating layer in contact with the lower pouch adjacent thereto, and blocks electricity and vibration of the electrode tab and/or the electrode lead. A pouch-type secondary battery, characterized in that.
According to any one of claims 1 to 5 and 7 to 10,
Device comprising the pouch-type secondary battery.
12. The method of claim 11,
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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