KR20210074753A - Current evaluating device and evaluating method using the same - Google Patents

Abstract

The present invention relates to a conduction evaluation device and a conduction evaluation method using the same, which can safely evaluate whether a gas component emitted during ignition or explosion of a battery module and the like generates conduction while passing between metallic objects inside a battery pack (such as a bus bar and a bus bar or a bus bar and a module frame).

Description

Electricity evaluation device and evaluation method using same {CURRENT EVALUATING DEVICE AND EVALUATING METHOD USING THE SAME}

The present invention relates to an energization evaluation device and a energization evaluation method using the same.

With the increase in technology development and demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, a lithium secondary battery is widely used as an energy source for various electronic products and electric vehicles as well as various mobile devices because of its high energy density and operating voltage and excellent preservation and lifespan characteristics.

As the field of application for secondary batteries is widened, the demand for higher-capacity secondary batteries is rapidly increasing. As a method of providing a high-capacity secondary battery, it is possible to form a battery module or battery pack in which a plurality of unit cells are aggregated.

A battery pack has a structure in which a plurality of battery modules are packaged. When one battery module ignites due to an abnormal cause such as penetration, heating, or the spread of heat or flame, the ignition phenomenon propagates to other nearby battery modules, and in severe cases, the battery pack may explode.

One of the main causes of propagation of the ignition phenomenon is that the chemical substance inside the battery is propagated to the surroundings as the battery module ignites or explodes. The fired battery module and other surrounding battery modules are spaced apart from each other. However, electricity may occur as chemical substances inside the battery ejected as the battery module ignites or explodes pass between metallic objects inside the battery pack (such as a bus bar and a bus bar or a bus bar and a module frame). This energization causes an external short circuit, which propagates the fire to the surrounding modules.

In order to secure the safety of the battery pack, it is necessary to evaluate the stability of the gas component emitted when the battery module ignites or explodes. However, in the case of a simple simulation, the safety of the evaluator may be threatened in the evaluation process, and the gas emitted during the evaluation will cause environmental pollution.

Therefore, a technology that can safely analyze and evaluate whether the gas component emitted when a battery module ignites or explodes between metallic objects inside the battery pack (such as a bus bar and a bus bar or a bus bar and a module frame) induces electricity there is a need for

Japanese Patent Laid-Open No. 2015-117995

The present invention was devised to solve the above problems, and it is possible to safely analyze and evaluate whether a gas component emitted when a battery module, etc. ignites or explodes while passing between metallic objects inside the battery pack and generates electricity. An object of the present invention is to provide an energization evaluation device and an energization evaluation method using the same.

The present invention provides an energization evaluation device. In one example, the energization evaluation device according to the present invention, the body of the cyclone structure in which the introduced gas is circulated in an annular closed circulation path is formed; an inlet formed on one side of the body and into which a gas to be analyzed is introduced; an outlet located in the center of the body, through which the introduced gas is discharged; a pair of electrodes formed on one side of the body and electrically connected to the outside of the body; and a detection device electrically connected to the pair of electrodes and configured to measure resistance between the pair of electrodes. Including, between the body and the outlet, a structure in which a filter member for preventing the outflow of particulate components contained in the introduced gas is positioned.

In one example, the outlet is located in the center of the body, and extends in a vertical direction from the center of the body.

In a specific example, the outlet has a hollow cylindrical shape, and includes a portion recessed inside the body and a portion protruding outside the body.

For example, the outlet has a structure in which the interior and the compartment of the body are separated by a filter member in the portion recessed into the body.

In one example, the filter member includes a mesh structure that does not pass particulate components having a particle size of 5 nm or more.

For another example, the outlet has a structure in which the upper portion of the portion protruding outside the body is opened.

In another example, the electric current evaluation apparatus according to the present invention further includes an electrode position adjusting member for controlling the separation distance between the pair of electrodes.

In a specific example, the pair of electrodes includes a structure in which two conductive metal rods are formed in parallel.

In another example, the inlet further includes a blowing fan that controls at least one of an inflow rate and an inflow amount of gas.

In one example, the detection device is a resistance meter that measures the resistance between a pair of electrodes.

In another example, the detection device includes a constant voltage application device and a current sensor.

In addition, the present invention provides a energization evaluation method using the energization evaluation device described above. In one example, the energization evaluation method according to the present invention comprises the steps of supplying an analysis target gas containing conductive particles through an inlet; while the supplied gas circulates inside the body of the cyclone structure in which the closed circulation path is formed, measuring whether electricity is energized between the pair of electrodes; and discharging the gas through the outlet, wherein the discharging of the gas discharges the gas not containing the conductive particles through a filtering process for the discharged gas.

In one example, the step of detecting whether energization is performed is a step of measuring resistance between the pair of electrodes.

In another example, the detecting of whether energization is performed is a step of applying a constant voltage to the pair of electrodes, and measuring the resistance of the gas to the leakage current or the constant voltage.

In a specific example, the step of detecting whether electricity is energized includes changing the separation distance between the pair of electrodes while the gas introduced into the body of the cyclone structure circulates.

In another example, the current evaluation method according to the present invention, the step of supplying an analysis target gas; measuring the resistance between the pair of electrodes; and discharging the gas simultaneously.

The energization evaluation apparatus and the energization evaluation method including the same according to the present invention can safely and environmentally evaluate whether a gas component emitted when a battery module ignites or explodes while passing between metallic objects inside a battery pack and causes electricity can

1 is a perspective view of a current evaluation device according to an embodiment of the present invention.
2 is a plan view of a current evaluation device according to an embodiment of the present invention.
Figure 3 is a front view of the electricity evaluation device according to an embodiment of the present invention.
4 is a perspective view of a current evaluation device according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail. Prior to this, the terms or words used in the present specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventor must properly understand the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in

In one embodiment, the present invention relates to an energization evaluation device,

a body having a cyclone structure in which a closed circulation path in which the introduced gas circulates in an annular shape is formed;

an inlet formed on one side of the body and into which external gas is introduced;

an outlet located in the center of the body, through which the introduced gas is discharged;

a pair of electrodes formed on one side of the body and electrically connected to the outside of the body; and

and a detection device electrically connected to the pair of electrodes and configured to detect whether electricity is energized between the pair of electrodes,

Between the body and the outlet, a filter member for preventing the outflow of particulate components contained in the introduced gas is positioned.

The energization evaluation device according to the present invention can effectively and safely simulate a phenomenon in which a chemical substance inside a battery passes between two electrodes even if the battery module does not actually ignite or explode. In addition, by controlling the gas flowing through the inlet, it is possible to evaluate the gas containing the conductive particles of various compositions or contents. For example, the type of conductive particles contained in the gas may be changed or the content of the particles may be adjusted. The present invention can reproduce the ignition or explosion of various types of battery modules by adjusting the type or content of the conductive particles contained in the gas. Therefore, it is possible to perform evaluation without manufacturing a separate battery module.

In addition, in the energization evaluation device according to the present invention, the gas introduced through the inlet circulates in an annular shape inside the body of the cyclone structure. Here, the cyclone structure means a structure in which a closed circulation path through which an internal fluid can circulate is formed. Specifically, the shape of the closed circuit may be circular or elliptical, and may be variously set according to measurement conditions. In addition, a filter member is positioned between the body and the outlet to prevent the outflow of particulate components contained in the introduced gas. That is, the gas to be analyzed is circulated in a closed loop inside the body, but discharged to the outside in a state in which particulate components contained in the gas are removed. Therefore, since the device according to the present invention prevents the gas to be analyzed from flowing out while containing harmful particulate components, a separate current collecting facility for processing the exhaust gas is not required. In addition, there is an advantage that continuous measurement experiments are possible by forming a closed circulating flow path.

In one embodiment, the outlet is located in the center of the body, and extends in the vertical direction from the center of the body. The introduced gas is induced to circulate annularly around the outlet inside the body. In the present invention, by locating the outlet in the center of the body, it is possible to increase the space utilization and facilitate the discharge of gas.

In a specific embodiment, the outlet has a hollow cylindrical shape, and includes a portion recessed inside the body and a portion protruding outside the body. More specifically, the outlet has a structure in which the interior and the compartment of the body are separated by a filter member in the portion recessed into the body.

In the present invention, the filter member means a structure that does not allow permeation of particulate components larger than a certain size. For example, in the present invention, the gas flowing into the inlet contains conductive particles, the gaseous component passes through the filter member, but the conductive particles do not pass through the filter member. The size of the particles allowing passage of the filter member may be set differently as needed. In one embodiment, the filter member includes a mesh structure that does not pass particulate components having a particle size of 5 nm or more. For example, when the gas flowing into the inlet contains conductive particles having a particle diameter of 5 nm or more, and the filter member includes a mesh structure that does not pass particulate components having a particle diameter of 5 nm or more, the conductive particles contained in the gas are filtered cannot pass through the absence. Through this, the evaluation apparatus according to the present invention removes harmful particulate components from the gas to be analyzed, and discharges only the gas from which the particulate components are removed. In one embodiment, the filter element is of a detachable or replaceable construction. A cage is formed in which the filter member can be inserted, and the filter member is detachable or replaceable.

In another embodiment, the outlet has a structure in which an upper portion of a portion protruding outside the body is opened. By opening the upper part of the outlet, the gas passing through the filter member is discharged to the outside. If necessary, the upper portion of the outlet may have a structure in fluid connection with a separate gas collection device or the like.

In one embodiment, the energization evaluation device according to the present invention further includes an electrode position adjusting member for controlling the separation distance between the pair of electrodes. The pair of electrodes is, for example, a configuration corresponding to between the bus bar and the bus bar electrically connecting between the battery modules or between the bus bar and the module frame. A simulation experiment is possible by controlling the separation distance between the pair of electrodes to correspond to the separation distance between the bus bar and the bus bar formed in the battery module to be evaluated or between the bus bar and the module frame. The electrode position adjusting member can be designed in various forms, for example, a structure in which a plurality of holes for inserting electrodes are formed in a body of a cyclone structure, or a structure in which the separation distance is adjusted according to the operation of a lever, etc. This is applicable.

In one embodiment, the pair of electrodes includes a structure in which two conductive metal rods are formed in parallel. The pair of electrodes has a configuration corresponding to a bus bar and a bus bar formed in the battery module or a bus bar and a module frame, and can be variously modified if a predetermined distance can be realized. For example, the pair of electrodes may have a structure in which two conductive metal bars are positioned in parallel or a structure in which a metal plate is positioned in parallel.

In another embodiment, the inlet further includes a blowing fan for controlling at least one of an inflow rate and an inflow amount of the gas. The blowing fan may be formed on the flow path of the gas introduced through the inlet. Through this, it is possible to appropriately control any one or more of the inflow rate and the inflow amount of the gas introduced into the body. Furthermore, the gas containing the conductive particles is circulated through the blowing fan through the closed circulation path in the body, and the circulation speed can be controlled.

The inside of the body of the cyclone structure forms a closed circulation path in which the gas circulates in an annular shape. At this time, the present invention includes a case in which a pattern for assisting circulation of gas is formed on the inner wall surface of the body. For example, the pattern is a protrusion pattern in the form of a thread protruding from the inner wall of the body. Specifically, the pattern is in the form of a helical protrusion of a shape surrounding the inside of the body of the cyclone structure along the inner wall of the body. Through the pattern, it is possible to promote the circulation of the gas and prevent sedimentation of the conductive particles contained in the gas.

Meanwhile, in one embodiment, the detection device may be a resistance meter that measures the resistance between the pair of electrodes. For example, the resistance meter may be a method of calculating resistance by applying a voltage or current and measuring the resulting current or voltage. When the pair of electrodes is energized by the energizing material including conductive particles, the resistance between the two electrodes is greatly reduced, and thus, it is possible to check whether energization is performed by detecting the decrease in resistance.

In another embodiment, the detection device includes a constant voltage application device and a current sensor. In this case, the constant voltage applying device applies a predetermined constant voltage to the pair of electrodes. The current sensor is installed on the electrode and the constant voltage applying device, and may be installed on any of the two electrodes. When a constant voltage application device is used as the detection device, it is possible to measure the leakage current to the supply gas or the resistance of the gas to the constant voltage.

In addition, the present invention provides an evaluation method using the energization evaluation device described above. In one embodiment, the current evaluation method according to the present invention,

supplying an analysis target gas containing conductive particles through an inlet;

while the supplied gas circulates inside the body of the cyclone structure in which the closed circulation path is formed, detecting whether electricity is energized between the pair of electrodes; and

venting the gas through the outlet;

In the step of discharging the gas, the gas not containing the conductive particles is discharged through a filtering process for the discharged gas.

Specifically, it is possible to design an emission gas containing a chemical substance inside the battery that is released in case of fire or explosion of the battery, and supply it as the gas to be analyzed. As the supplied gas circulates inside the body of the cyclone structure, conductive particles are attached to the pair of electrodes, thereby generating electricity between the electrodes. The inside of the body of the cyclone structure is a structure in which a closed loop is formed. Therefore, it is possible to prevent the gas to be analyzed from being discharged to the outside as it is supplied and to continuously conduct measurement experiments.

It is detected whether a pair of electrodes is energized while the gas to be analyzed is circulated. In one example, the step of detecting whether current is conducted is a step of measuring a resistance between the pair of electrodes. Specifically, in the step of detecting whether electricity is energized, the insulation resistance between the pair of electrodes is measured. In order to conduct electricity between a pair of electrodes spaced apart, a certain level or more of conductive particles must be contained in the gas. However, whether electricity is energized is affected by the particle size or size of the conductive particles. In the present invention, a situation in which a fire or explosion occurs in a battery module is indirectly reproduced, and in this case, it is evaluated whether a pair of electrodes corresponding to a busbar and a busbar between battery modules or a busbar and a module frame are energized.

In another embodiment, the detecting whether the current is conducted may include applying a constant voltage to the pair of electrodes, and measuring the resistance of the gas to the leakage current or the constant voltage.

On the other hand, the gas that has been evaluated is discharged through the outlet. In this case, the discharged gas is filtered by the filter member. Therefore, the exhaust gas is in a state from which particulate components have been removed. Accordingly, since the evaluation method according to the present invention prevents the gas to be analyzed from flowing out while containing harmful particulate components, a separate current collecting facility for processing the exhaust gas is not required.

In one embodiment, the detecting whether the current is conducted includes changing the separation distance between the pair of electrodes while the gas introduced into the body circulates. The pair of electrodes may include a separate adjusting member for controlling the separation distance. Through this, it is possible to evaluate various conditions through one gas supply.

In another embodiment, in the step of detecting whether electricity is supplied, the composition and density of the gas to be analyzed may be appropriately adjusted according to the situation to be simulated. That is, the step of detecting whether electricity is supplied may further include changing the composition or density of the gas to be analyzed.

In another embodiment, the evaluation method according to the present invention, the step of supplying the analysis target gas described above; measuring the resistance between the pair of electrodes; And the step of discharging the gas, it is possible to be performed sequentially or simultaneously.

For example, after supplying a gas to be analyzed and detecting whether electricity is energized between a pair of electrodes under the supplied gas condition, the gas that has been evaluated may be discharged through an outlet. These series of processes may be sequentially performed.

As another example, it is also possible to simultaneously perform each of the steps described above. The gas to be analyzed is continuously supplied through the inlet, and the filtered gas is continuously discharged through the outlet. In the process, it is detected whether electricity is applied between the pair of electrodes. Through this, the composition of the gas to be analyzed may be changed or the density of conductive particles contained in the gas may be increased. That is, the evaluation method according to the present invention may change the composition and density of the gas to be analyzed and continuously perform various evaluations according to the changed conditions.

In the energization evaluation apparatus or energization evaluation method according to the present invention, the analysis target gas introduced through the inlet simulates the gas emitted when the battery module ignites or explodes. As the battery module ignites or explodes, various chemicals stored in the unit cells in the battery module are released together. When the battery module ignites or explodes, the chemicals inside the battery pass between metallic objects inside the battery pack (such as a bus bar and a bus bar or a bus bar and a module frame), and electricity can occur. This energization causes an external short circuit, which propagates the fire to the surrounding modules. Accordingly, one of the main causes of propagation of the ignition phenomenon is that, as the battery module ignites or explodes, the chemical substance, particularly the conductive component, inside the battery propagates to the surroundings.

In the present invention, the evaluation target may be a case in which the battery module or battery pack includes a secondary battery as a unit cell. Specifically, the secondary battery is a lithium secondary battery. A lithium secondary battery is a generic term for cases in which lithium is contained in a secondary battery, and specifically includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. For example, a positive electrode, a negative electrode, a separator, an electrolyte, etc. forming a lithium secondary battery contain various chemical substances, and also contain a conductive material such as carbon black. Such a conductive material is a cause of propagating a fire generated when a fire occurs in a battery module or the like.

Hereinafter, specific components of the battery will be described, but the scope of the present invention is not limited thereto.

The positive electrode has a structure in which a positive electrode mixture layer is laminated on one or both surfaces of a positive electrode current collector. The positive active material may be each independently a lithium-containing oxide, and may be the same or different. As the lithium-containing oxide, a lithium-containing transition metal oxide may be used. In one example, the positive electrode mixture layer includes a conductive material and a binder polymer in addition to the positive electrode active material, and, if necessary, may further include a positive electrode additive commonly used in the art.

The positive active material may be a lithium-containing oxide, and may be the same or different. As the lithium-containing oxide, a lithium-containing transition metal oxide may be used.

For example, the lithium-containing transition metal oxide is Li _x CoO ₂ (0.5<x<1.3), Li _x NiO ₂ (0.5<x<1.3), Li _x MnO ₂ (0.5<x<1.3), Li _x Mn ₂ O ₄ (0.5<x<1.3), Li _x (Ni _a Co _b Mn _c )O ₂ (0.5<x<1.3, 0<a<1, 0<b<1, 0<c<1, a +b+c=1), Li _x Ni _1-y Co _y O ₂ (0.5<x<1.3, 0<y<1), Li _x Co _1-y Mn _y O ₂ (0.5<x<1.3, 0 ≤y<1), Li _x Ni _1-y Mn _y O ₂ (0.5<x<1.3, O≤y<1), Li _x (Ni _a Co _b Mn _c )O ₄ (0.5<x<1.3, 0 <a<2, 0<b<2, 0<c<2, a+b+c=2), Li _x Mn _2-z Ni _z O ₄ (0.5<x<1.3, 0<z<2), Li _x Mn _2-z Co _z O ₄ (0.5<x<1.3, 0<z<2), Li _x CoPO ₄ (0.5<x<1.3) and Li _x FePO ₄ (0.5<x<1.3) It may be any one selected from or a mixture of two or more thereof, and the lithium-containing transition metal oxide may be coated with a metal such as aluminum (Al) or a metal oxide. In addition, in addition to the lithium-containing transition metal oxide, at least one of sulfide, selenide, and halide may be used.

The positive active material may be included in the positive electrode mixture layer in an amount of 90 to 99 wt%. When the content of the positive electrode active material satisfies the above range, it is advantageous in terms of manufacturing a high-capacity battery and imparting sufficient positive electrode conductivity or adhesion between electrode materials.

The current collector used for the positive electrode is a metal with high conductivity, and any metal that can be easily adhered to the positive electrode active material slurry and has no reactivity in the voltage range of the secondary battery may be used. Specifically, non-limiting examples of the current collector for the positive electrode include a foil made of aluminum, nickel, or a combination thereof.

The positive electrode mixture layer further includes a conductive material. The conductive material is typically added in an amount of 1 to 30% by weight based on the total weight of the mixture including the positive active material. The conductive material is not particularly limited as long as it has conductivity without causing a chemical change in the secondary battery. For example, as the conductive material, graphite such as natural graphite or artificial graphite; carbon black, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; conductive fibers such as carbon fibers and metal fibers; metal powders such as carbon fluoride, aluminum, and nickel powder; conductive whiskeys such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; and at least one selected from the group consisting of polyphenylene derivatives and the like may be used.

As the binder component, a binder polymer commonly used in the art may be used without limitation. For example, polyvinylidene fluoride-hexafluoropropylene (Poly (vinylidene fluoride-co-hexafluoropropylene), PVDF-co-HFP), polyvinylidene fluoride (PVDF), polyacrylonitrile (polyacrylonitrile) ), polymethyl methacrylate, styrene-butadiene rubber (SBR), and various types of binders such as carboxyl methyl cellulose (CMC) may be used.

In addition, the negative electrode has a structure in which a negative electrode mixture layer is laminated on one or both surfaces of a negative electrode current collector. In one example, the negative electrode mixture layer includes an anode active material, a conductive material, and a binder polymer, and if necessary, may further include a negative electrode additive commonly used in the art.

The negative active material may include a carbon material, lithium metal, silicon or tin. When a carbon material is used as the negative electrode active material, both low crystalline carbon and high crystalline carbon may be used. Soft carbon and hard carbon are representative of low crystalline carbon, and natural graphite, Kish graphite, pyrolytic carbon, and liquid crystal pitch-based carbon fiber are representative of high crystalline carbon. (mesophase pitch based carbon fiber), carbon microspheres (mesocarbon microbeads), liquid crystal pitches (Mesophase pitches), and high-temperature calcined carbon such as petroleum and coal-based cokes (petroleum orcoal tar pitch derived cokes) are representative examples.

Non-limiting examples of the current collector used for the negative electrode include a foil made of copper, gold, nickel, or a copper alloy, or a combination thereof. In addition, the current collector may be used by stacking substrates made of the above materials.

In addition, the negative electrode may include a conductive material and a binder commonly used in the art.

The secondary battery may include an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte for impregnating the electrode assembly; and a battery case containing the electrode assembly and the non-aqueous electrolyte. The non-aqueous electrolyte is, for example, an electrolyte containing a lithium salt.

As the separator, any porous substrate used in a lithium secondary battery may be used, for example, a polyolefin-based porous membrane or a nonwoven fabric may be used, but is not particularly limited thereto.

Examples of the polyolefin-based porous membrane include polyethylene such as high-density polyethylene, linear low-density polyethylene, low-density polyethylene, and ultra-high molecular weight polyethylene, and polyolefin-based polymers such as polypropylene, polybutylene, and polypentene, respectively, individually or in a mixture thereof. One membrane is mentioned.

As the nonwoven fabric, in addition to the polyolefin-based nonwoven fabric, for example, polyethyleneterephthalate, polybutyleneterephthalate, polyester, polyacetal, polyamide, polycarbonate ), polyimide, polyetheretherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide, or polyethylenenaphthalene, each alone or and a nonwoven fabric formed of a polymer obtained by mixing them. The structure of the nonwoven fabric may be a spunbond nonwoven fabric composed of long fibers or a melt blown nonwoven fabric.

The thickness of the porous substrate is not particularly limited, but may be 5 to 50 μm, and the pore size and pores present in the porous substrate are also not particularly limited, but may be 0.01 to 50 μm and 10 to 95%, respectively.

On the other hand, in order to improve the mechanical strength of the separator composed of the porous substrate and suppress a short circuit between the positive electrode and the negative electrode, a porous coating layer including inorganic particles and a binder polymer on at least one surface of the porous substrate may be further included.

The electrolyte may include an organic solvent and an electrolyte salt, and the electrolyte salt is a lithium salt. As the lithium salt, those commonly used in non-aqueous electrolytes for lithium secondary batteries may be used without limitation. For example, as an anion of the lithium salt ^{, F -} , Cl ^- , Br ^- , I ^- , NO ₃ ^- , N(CN) ₂ ^- , BF ₄ ^- , ClO ₄ ^- , PF ₆ ^- , (CF ₃ ) ₂ PF ₄ ^- , (CF ₃ ) ₃ PF ₃ ^- , (CF ₃ ) ₄ PF ₂ ^- , (CF ₃ ) ₅ PF ^- , (CF ₃ ) ₆ P ^- , CF ₃ SO ₃ ^- , CF ₃ CF ₂ SO ₃ ^- , (CF ₃ SO ₂ ) ₂ N ^- , (FSO ₂ ) ₂ N ^- , CF ₃ CF ₂ (CF ₃ ) ₂ CO ^- , (CF ₃ SO ₂ ) ₂ CH ^- , (SF ₅ ) ₃ C ^- , CF ₃ (CF ₂ ) ₇ SO ₃ ^- , CF ₃ CO ₂ ^- , CH ₃ CO ₂ ^- , SCN ^- and (CF ₃ CF ₂ SO ₂ ) ₂ N ^- Any one or two or more of them may include.

As the organic solvent included in the above-mentioned electrolyte, those commonly used in electrolyte for lithium secondary batteries may be used without limitation, for example, ether, ester, amide, linear carbonate or cyclic carbonate, etc. individually or in mixture of two or more types. can be used by Among them, cyclic carbonates, linear carbonates, or a carbonate compound that is a mixture thereof may be included.

Specific examples of the cyclic carbonate compound include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, There is any one selected from the group consisting of 2,3-pentylene carbonate, vinylene carbonate, vinylethylene carbonate, and halides thereof, or a mixture of two or more thereof. Examples of these halides include, but are not limited to, fluoroethylene carbonate (FEC).

In addition, specific examples of the linear carbonate compound include any one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethylmethyl carbonate (EMC), methylpropyl carbonate, and ethylpropyl carbonate, or these A mixture of two or more of them may be typically used, but is not limited thereto.

In particular, among the carbonate-based organic solvents, ethylene carbonate and propylene carbonate, which are cyclic carbonates, are high-viscosity organic solvents and have a high dielectric constant, so that lithium salts in the electrolyte can be better dissociated. If a low-viscosity, low-dielectric constant linear carbonate is mixed in an appropriate ratio, an electrolyte having a higher electrical conductivity can be prepared.

In addition, as the ether of the organic solvent, any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methylethyl ether, methylpropyl ether, and ethylpropyl ether or a mixture of two or more thereof may be used. , but is not limited thereto.

And esters in the organic solvent include methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ - Any one selected from the group consisting of -valerolactone and ε-caprolactone or a mixture of two or more thereof may be used, but the present invention is not limited thereto.

The injection of the non-aqueous electrolyte may be performed at an appropriate stage during the manufacturing process of the battery cell according to the manufacturing process of the final product and required physical properties. That is, it may be applied before assembling the battery cell or in the final stage of assembling the battery cell.

Hereinafter, the present invention will be described in more detail with reference to drawings and the like.

(First embodiment)

Figure 1 is a perspective view of an energization evaluation device according to an embodiment of the present invention, Figure 2 is a plan view of the energization evaluation device according to an embodiment of the present invention, Figure 3 is an energization evaluation device according to an embodiment of the present invention is a front view of However, for convenience of description, some of the internal structures of the device are projected and illustrated.

1 to 3, the energization evaluation device according to the present invention is formed on one side of the body 100, the body 100 of the cyclone structure in which a closed circulation path in which the introduced gas circulates in an annular shape is formed, It has a structure including an inlet 110 through which external gas is introduced and an outlet 120 through which the introduced gas is discharged, which is located in the center of the body 100 . In addition, a pair of electrodes 131 and 132 electrically connected to the outside are formed on one side of the body 100 , and the pair of electrodes 131 and 132 are formed to pass through one side of the body 100 . do. The pair of electrodes 131 and 132 is connected to the detection device 140 . The detection device 140 is a resistance measuring device, and measures the insulation resistance between the pair of electrodes 131 and 132 . The energization evaluation device may further include an electrode position adjusting member (not shown) for controlling a separation distance between the pair of electrodes 131 and 132 .

The outlet 120 is located in the center of the body 100, but extends in the vertical direction from the center of the body 100 of the cyclone structure. In addition, the outlet 120 has a hollow cylindrical shape, and includes a portion recessed in the body 100 and a portion protruding outside the body 100 . The outlet has a structure in which a portion recessed in the body is separated from the body 100 having a cyclone structure by the filter member 121 .

The gas introduced through the inlet 110 circulates in an annular shape inside the body 100 having a cyclone structure. That is, the gas to be analyzed is attached to the pair of electrodes 131 and 132 while circulating in a closed loop inside the body 100 and energizes the pair of electrodes 131 and 132 . In this process, the insulation resistance between a pair of spaced apart electrodes 131 and 132 is measured. Meanwhile, in the gas introduced into the body, particulate components are filtered by the filter member 121 , and only gaseous components that do not contain particles are discharged through the outlet.

The filter member 121 includes a mesh structure, and serves to not transmit particulate components of a predetermined size or more. For example, the mesh structure is a form that does not pass a particle component having a particle size of 5 nm or more.

(Second embodiment)

4 is a perspective view of a current evaluation device according to another embodiment of the present invention.

Referring to FIG. 4, the energization evaluation device according to the present invention is formed on one side of the body 200, the body 200 having a cyclone structure in which a closed circulation path in which the introduced gas circulates in an annular shape, and the external gas is It is located in the center of the inlet 210 and the body 200, and has a structure including an outlet 220 through which the introduced gas is discharged. In addition, a pair of electrodes 231 and 232 electrically connected to the outside are formed on one side of the body 200 , and the pair of electrodes 231 and 232 are formed to penetrate one side of the body 200 . do. The pair of electrodes 231 and 232 is connected to the detection device 240 . The energization evaluation device may further include an electrode position adjusting member (not shown) for controlling the separation distance between the pair of electrodes 231 and 232 .

The detection device 240 includes a constant voltage application device 241 and a current sensor 242 . The current sensor 242 may be installed between any one of the pair of electrodes 231 and 232 and the constant voltage applying device 241 .

The outlet 220 is located in the center of the body 200, but extends in the vertical direction from the center of the body 200 of the cyclone structure. In addition, the outlet 220 has a hollow cylindrical shape, and includes a portion recessed in the body 200 and a portion protruding outside the body 200 . The outlet has a structure in which a portion recessed in the body is separated from the body 200 by the filter member 221 .

The gas introduced through the inlet 210 circulates in the body 200 in an annular shape. That is, the gas to be analyzed is attached to the pair of electrodes 231 and 232 while circulating in a closed loop inside the body 200 and energizes the pair of electrodes 231 and 232 . In this process, a constant voltage is applied to the pair of electrodes 231 and 232, and in this process, the current sensor 242 measures the resistance of the gas to the leakage current or the constant voltage. In the gas, particulate components are filtered by the filter member 221 , and only gaseous components that do not contain particles are discharged through the outlet.

The filter member 221 includes a mesh structure, and serves to not transmit a particle component having a size larger than a predetermined size. For example, the mesh structure is a form that does not pass a particle component having a particle size of 5 nm or more.

Above, the present invention has been described in more detail with reference to the drawings and the like. However, the configuration described in the drawings or embodiments described in the present specification is only one embodiment of the present invention and does not represent all the technical spirit of the present invention, so at the time of the present application, various equivalents and It should be understood that there may be variations.

100, 200: body
110, 210: inlet
120, 220: outlet
121, 221: filter element
131, 132, 231, 232: electrode
140, 240: detection device
241: constant voltage application device
242: current sensor

Claims (16)

a body having a cyclone structure in which a closed circulation path in which the introduced gas circulates in an annular shape is formed;
an inlet formed on one side of the body and into which a gas to be analyzed is introduced;
an outlet located in the center of the body, through which the introduced gas is discharged;
a pair of electrodes formed on one side of the body and electrically connected to the outside of the body; and
and a detection device electrically connected to the pair of electrodes and configured to detect whether electricity is energized between the pair of electrodes,
A current evaluation device having a structure in which a filter member for preventing the outflow of particulate components contained in the introduced gas is positioned between the body and the outlet.
The method of claim 1,
The outlet, but located in the center of the body, electricity evaluation device in the form of extending in the vertical direction from the center of the body.
The method of claim 1,
The outlet is
It is a hollow cylindrical shape,
Electricity evaluation device including a portion recessed inside the body and a portion protruding outside the body.
4. The method of claim 3,
The outlet is
Electricity evaluation device, characterized in that the portion recessed into the body has a structure in which the inside and the compartment of the body are separated by a filter member.
The method of claim 1,
The filter member comprises a mesh structure that does not pass particulate components having a particle size of 5 nm or more.
4. The method of claim 3,
The outlet is an electric current evaluation device having an open upper portion of the portion protruding to the outside of the body.
The method of claim 1,
Electricity evaluation device further comprising an electrode position adjusting member for controlling the separation distance between the pair of electrodes.
The method of claim 1,
The pair of electrodes includes a structure in which two conductive metal rods are formed in parallel.
The method of claim 1,
The inlet may further include a blowing fan for controlling at least one of an inflow rate and an inflow amount of gas.
The method of claim 1,
The detection device is an energization evaluation device, characterized in that it is a resistance measuring device for measuring the resistance between the pair of electrodes.
The method of claim 1,
The detection device includes a constant voltage application device and a current sensor.
In the evaluation method using the energization evaluation device according to any one of claims 1 to 11,
supplying an analysis target gas containing conductive particles through an inlet;
while the supplied gas circulates inside the body of the cyclone structure in which the closed circulation path is formed, detecting whether electricity is energized between the pair of electrodes; and
venting the gas through the outlet;
The discharging of the gas may include discharging a gas that does not contain conductive particles through a filtering process for the discharged gas.
13. The method of claim 12,
The step of detecting whether the current is energized,
Electricity evaluation method, characterized in that the step of measuring the resistance between the pair of electrodes.
13. The method of claim 12,
The step of detecting whether the current is energized,
Electricity evaluation method, characterized in that applying a constant voltage to the pair of electrodes, and measuring the resistance of the gas to the leakage current or the constant voltage accordingly.
13. The method of claim 12,
The step of detecting whether the current is energized,
Electricity evaluation method comprising the step of changing the separation distance between the pair of electrodes while the gas introduced into the body circulates.
13. The method of claim 12,
supplying a gas to be analyzed; detecting whether energization is present; And the step of discharging the gas, electricity evaluation method, characterized in that performed at the same time.

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