JP2007227171A - Nonaqueous electrolyte secondary battery, and power storage device using nonaqueous electrolyte secondary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve safety of a nonaqueous electrolyte secondary battery, and to improve safety of a large-capacity power storage device with multiple nonaqueous electrolyte secondary batteries arranged therein. <P>SOLUTION: A bag body with an ammonia compound sealed therein is arranged in a space in a battery. A bag having an ammonia compound sealed therein is arranged above safety valves of multiple nonaqueous electrolyte secondary batteries in a housing with the multiple nonaqueous electrolyte secondary batteries arranged therein. A bag having an ammonia compound sealed therein is arranged in an important spot of a smoke path formed in a housing of a large-capacity power storage device with multiple nonaqueous electrolyte secondary batteries arranged therein. Ammonium hydrogencarbonate powder is included in at least either of a positive electrode and a negative electrode of a nonaqueous electrolyte secondary battery. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a non-aqueous electrolyte secondary battery, and more particularly to a technique for preventing a temperature increase of a non-aqueous electrolyte secondary battery used in a power storage device or the like, and further, combustion of gas ejected by a rupture of a safety valve And technology for preventing chaining to nearby batteries.

  A battery using a non-aqueous electrolyte has a high voltage and a high energy density, and is excellent in reliability such as storability and leakage resistance, and is used in a wide range of applications. However, the solvent of such non-aqueous electrolyte is a flammable organic solvent, and many of them have low withstand voltage. When used in a secondary battery, the solvent is electrolyzed when charging and discharging are repeated, and thus generated. The internal pressure of the battery increases due to the gas, or the product causes a polymerization reaction and adheres to the electrode to decrease the battery energy density, resulting in a decrease in discharge capacity due to repeated charge and discharge. In general, non-aqueous electrolyte secondary batteries have a sealed structure to prevent moisture from entering the battery. If a short circuit or overcharge occurs due to misuse of the battery or failure of the protection circuit, the battery temperature rises. A large amount of high-temperature gas is generated in the battery due to rapid vaporization of the electrolyte contained therein, and the internal pressure of the battery rapidly increases. If this state continues, there is a risk of the battery body bursting. As a safety measure against this, in non-aqueous electrolyte secondary batteries, when the pressure inside the battery rises above a certain level, the safety valve opens to prevent excessive rise in internal pressure and prevent battery explosion. It is configured. In a large-capacity device in which a large number of secondary batteries are arranged in a casing, neighboring secondary batteries are heated by the high-temperature gas that is blown out, and the internal pressure of neighboring batteries also rises and the safety valve opens. There is a risk of inducing an abnormal chain. The gas ejected from the safety valve is very flammable, and if there is an ignition source around the device, a fire may be generated by the combustible gas released from the battery.

  As a measure for preventing the increase in internal temperature as described above, a battery in which ammonium phosphate is added to at least one of the positive electrode plate or the negative electrode plate (see, for example, Patent Document 1) or a quaternary ammonia salt is used as the negative electrode. And a battery (see, for example, Patent Document 2) included in an electrolyte.

Further, in a large-capacity power storage device in which a large number of non-aqueous electrolyte fuel cells having safety valves are incorporated in a rack, a power storage device is disclosed in which an abnormality of a small number of batteries does not induce an abnormality in a neighboring battery in a chained manner (for example, (See Patent Document 3).
JP-A-11-154535 JP 2004-71340 A JP 2003-68266 A

  In the power storage device and its management system disclosed in Patent Document 3, an abnormality occurs in one of the power storage devices in which many nonaqueous electrolyte secondary batteries are arranged, the internal temperature rises, and the internal pressure is remarkably increased. When the safety valve is released and the hot gas is blown out, it prevents the influence from affecting other neighboring batteries and inducing an abnormal chain. In order to prevent the induction of abnormal chains, it measures and activates the means to inject shield gas according to the temperature signal, or operates the means to circulate the refrigerant through the jacket covering the outer surface of the battery. Although it is a very effective system, it is quite complex as a device and therefore must be expensive, and the safety valve of one battery is opened first or the ambient temperature near the battery is increased. Since but the system only after you have either to rise does not start working, take some time for the system is fully operational.

Accordingly, a first object of the present invention is to provide a non-aqueous electrolyte secondary battery in which abnormal temperature rise inside the battery is prevented by a simple and inexpensive method. A second object of the present invention is that in a power storage device configured using a large number of non-aqueous electrolyte secondary batteries, a certain battery has an abnormal temperature rise inside the battery, a safety valve is opened due to an increase in pressure, and hot gas is ejected. When the temperature of neighboring batteries rises due to the high-temperature gas, the safety valve is opened, and high-temperature gas is ejected. It is providing the electric power storage apparatus using.
In addition, a third object of the present invention is to provide a secondary battery that prevents sudden heat generation of the secondary battery and has less capacity decrease due to repeated charge and discharge than the secondary batteries disclosed in Patent Documents 1 and 2. It is to be.

  In order to achieve the first object, the present invention provides a non-aqueous electrolyte secondary battery comprising a positive electrode and a negative electrode that mutually release and occlude lithium ions and a non-aqueous electrolyte, and a battery can of the battery. Proposed is a non-aqueous electrolyte secondary battery in which an ammonium compound, for example, ammonium hydrogen carbonate, is sealed in an internal space with a film that does not allow the non-aqueous electrolyte to pass through. The ammonium compound (for example, ammonium hydrogen carbonate) is sealed in a bag made of an electrically insulating film that does not allow the nonaqueous electrolyte to pass through in a powder state, and is placed in the internal space of the battery. The ammonium compound powder preferably has an average particle size of 8 μm to 20 μm, and the electrically insulating film that does not transmit the nonaqueous electrolyte is preferably a film that melts at a temperature of 150 ° C. to 250 ° C.

  In non-aqueous electrolyte secondary batteries, the reaction between the electrolyte and the electrode is an exothermic reaction, and heat is generated by charging / discharging, but normally the temperature does not rise abnormally due to the balance between heat generation and natural cooling. It is configured. However, if a negative or positive electrode short circuit occurs in the battery due to overcharge or other causes, the exothermic reaction becomes intense and the temperature of the electrolyte rises. When the temperature of the electrolytic solution rises, the reaction between the electrolytic solution and the electrode is accelerated, and the temperature rises further. Finally, the pressure in the battery rises significantly, the safety valve opens, and gas is ejected. This gas ignites at approximately 400-500 ° C.

  In particular, in the case of a large battery, the above-described short-circuit current increases, and in the case of a large battery, the surface area relative to the internal volume of the battery decreases, that is, the heat dissipation area decreases relative to the capacity, that is, the specific surface area decreases. Heat is easily generated, and the internal temperature is likely to rise. There have been proposed methods for treating the electrode to suppress the electrode reaction as described above, or adding an additive for suppressing the electrode reaction to the electrolytic solution (see, for example, Patent Documents 1 and 2). Then, it is inevitable that the charge / discharge capacity decreases as a result of the suppression of the electrode reaction.

  The present invention does not suppress the electrode reaction, but suppresses the occurrence of accidents by suppressing the ignition of the generated gas in the event that an abnormal temperature rise inside the battery occurs. A powdery ammonium compound (eg, ammonium hydrogen carbonate) is preferably sealed in a non-conductive film that melts at a temperature of 150 ° C. to 250 ° C. and placed in a space in the battery. The space in the battery to be disposed can be disposed, for example, in the upper space of a laminate composed of a positive electrode, a negative electrode, and a separator.

  When a film sealed with a powder of an ammonium compound (for example, ammonium hydrogen carbonate) melts, the ammonium compound is thermally decomposed to generate a combustion inhibiting substance. Since the ammonium compound powder is hermetically sealed with an insulating film, it is not mixed into the electrolyte solution, and does not inhibit the electrode reaction during normal operation of the battery. Further, by setting the average particle size of the ammonium compound powder to 8 μm to 20 μm, it is possible to increase the thermal decomposition rate of the ammonium compound at the time of abnormal heat generation of the battery, and to exert the effect quickly.

  The ammonium compound (for example, ammonium hydrogen carbonate) sealed with the film may be provided in a space provided in the passage of the gas flow from the inside of the battery in the safety valve portion of the battery. Normally, the safety valve is a rupture disc type, that is, a safety valve that opens when the battery internal pressure exceeds the specified pressure and the safety valve opens, is often used, but an ammonium compound sealed with a film with a space in the safety valve is used. If it arrange | positions, a film will melt | dissolve with the gas which ejects when a safety valve opens, and an ammonium compound will cover an ejection gas, and ignition is prevented.

  The ammonium compound may be formed into a sheet using a binder, hermetically packaged with an electrically insulating film that does not permeate the nonaqueous electrolyte, and placed in the internal space of the battery. Also in this case, it is preferable that the ammonium compound powder has an average particle diameter of 8 μm to 20 μm, and the packaging film melts at 150 ° C. to 250 ° C. The binder used is also one that softens at 150 ° C. to 250 ° C. and weakens the binding force. Thus, by storing the ammonium compound powder into a sheet and hermetically packaging with a film, storage, handling, and placement in the battery are facilitated.

  In the present invention, a plurality of non-aqueous electrolyte secondary batteries are connected and arranged in a housing, and a powder of an ammonium compound (for example, ammonium hydrogen carbonate) is placed over the safety valve of each non-aqueous electrolyte secondary battery. We propose a power storage device using a non-aqueous electrolyte secondary battery that is hermetically sealed in a bag of polymer material that does not penetrate and is electrically insulating. Since the ammonium compound powder is arranged above the safety valve of each secondary battery, when the temperature inside the battery rises abnormally and the internal pressure of the battery rises and the safety valve opens, the high temperature gas spouted out is the ammonium compound powder. It is possible to prevent the blown gas from combusting by melting the bag that has been sealed and contacting the powder.

  A flue that leads to the space in which each battery is disposed is provided in a housing in which the plurality of nonaqueous electrolyte secondary batteries are disposed, and an ammonium compound (for example, ammonium hydrogen carbonate) powder is provided at an outlet from the flue housing May be sealed in a polymer bag. If an adsorption tank filled with an adsorbent and suction means are provided on the downstream side of the ammonium compound powder arrangement, the ammonium compound powder need not be arranged above the safety valve of each battery. Alternatively, even if the safety valve of any battery is opened and combustion of the ejected gas cannot be suppressed above it, combustion can be reliably prevented at the flue outlet. The ejected gas and the combustion gas are discharged after the harmful components are adsorbed and removed.

  The present invention also provides a nonaqueous electrolyte secondary battery having a positive electrode and a negative electrode that mutually release and occlude lithium ions and a nonaqueous electrolyte, and a carbonic acid as an electrode active material of at least one of the positive electrode and the negative electrode. A non-aqueous electrolyte secondary battery characterized by containing ammonium hydrogen powder is proposed. Due to the presence of ammonium bicarbonate, ammonium bicarbonate absorbs oxygen radicals released from the positive electrode active material (lithium-containing transition metal oxide) during thermal runaway when the temperature in the battery rises abnormally, and rapid heat generation is suppressed. In addition, the combustion reaction of the electrolyte is inhibited. This prevents the electrolyte from igniting.

  By sealing the powder of ammonium compound and placing it in the space inside the non-aqueous secondary battery or above the safety valve, the internal temperature will rise abnormally due to battery overcharge or internal short circuit, and the safety valve will open. Even if a situation occurs in which hot gas is ejected, it is possible to prevent a situation in which the reaction quickly occurs and ignition occurs. Further, by containing ammonium hydrogen carbonate powder in the electrode active material, a rapid temperature rise in the battery can be suppressed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

FIG. 1 is a view showing a state in which a bag in which an ammonium compound (for example, ammonium hydrogen carbonate) powder is sealed is arranged in the internal space of a non-aqueous secondary battery according to an embodiment of the present invention. In the perspective view of the battery, the bag sealed with the ammonium compound powder is omitted. FIG. 3 is a top view of the battery of FIG. This nonaqueous electrolyte secondary battery is a so-called square type.
1 to 3, 1 is a nonaqueous electrolyte secondary battery, 2 is a positive electrode, 3 is a negative electrode, 4 is a separator, 5 is a battery case, and 6 is a sealing plate. 7 is a positive electrode terminal, 8 is a negative electrode terminal, and 15 is a liquid injection port. 12a is a positive electrode tab formed at one end of the positive electrode, 12b is a positive electrode lead connecting the positive electrode tab 12a, 13a is a negative electrode tab formed at one end of the negative electrode, and 13b is a negative electrode lead connecting the negative electrode tab 13a.

  The positive electrode 2 includes a positive electrode current collector and a positive electrode film formed on the surface thereof, and the negative electrode 3 includes a negative electrode current collector and a negative electrode film formed on the surface thereof. A plurality of positive and negative electrodes 2 and 3 are laminated in the lateral direction with the separator 4 interposed therebetween to form an electrode laminate 14. The positive electrode 2 and the negative electrode 3 are connected by a positive electrode lead 12 b and a negative electrode lead 13 b, respectively, and are connected to a positive electrode terminal 7 and a negative electrode terminal 8. In FIG. 3, two safety valves 9 are provided (not shown in FIG. 2). The safety valve is opened when the pressure in the battery exceeds a specified pressure to reduce the internal pressure and prevent the battery case 5 from bursting. Reference numeral 15 denotes a liquid injection port, and 16 denotes an insulating portion that insulates the terminal from the sealing plate 6.

  FIG. 1 shows a situation in which a bag body 20 in which an ammonia compound powder is sealed with a non-conductive film is arranged in the space between the upper end portion of the electrode laminate 14 and the sealing plate 6. Usually, the electrolytic solution is injected from the liquid injection port 15 after the electrode laminate 14 is placed in the battery case 5 and the sealing body 6 is attached. In the present invention, the electrode laminate 14 is placed in the battery case 5 and then the electrode. The bag is placed in the upper space of the laminated body 14 and the sealing body 6 is attached, and then the electrolyte is injected from the liquid injection port 15. The space in which the bag body is disposed is not limited to the upper part of the electrode laminate 14, and a space may be provided in another place. The ammonia compound powder preferably has an average particle size of 8 to 20 μm. Since the bag sealed with powder can be deformed to some degree of flexibility, it can be adapted to spaces of various shapes.

  FIG. 4 shows an embodiment in which ammonia compound powder is formed into a sheet with a binder and wrapped with a non-conductive film, (A) is a plan view, and (B) is an XX cross section in (A). Show. The sheet body 21 is composed of an ammonia compound 21a formed into a sheet shape with a binder and a film 21b for hermetically packaging it. You may arrange this sheet body 21 in the space in a battery. In the case where the shape of the space to be arranged is fixed, forming the sheet in this way facilitates the arrangement work and facilitates storage and transportation.

  Since the bag and sheet are covered with a non-conductive film, even if an ammonia compound solidified in a powder or sheet is placed on the molded electrode laminate, the electrodes are short-circuited. In addition, the ammonia compound does not come into contact with the electrolytic solution.

  The non-conductive film is preferably made of a polymer material that melts at 150 to 250 ° C., for example. In other words, the film is melted at a temperature of 150 ° C. to 250 ° C. and the ammonia compound is sprayed. As the binder for forming the ammonia compound powder into a sheet with a binder, a binder that softens at a temperature of 150 ° C. to 250 ° C. and weakens the binding force is used.

  FIG. 5 shows an embodiment in which a bag body in which a space is provided in the safety valve portion and the powder of the ammonia compound is sealed is arranged, and a safety valve 40 including a valve box 41 and a valve plate 42 is attached to the sealing plate 6. A hole 43 leading to the inside of the battery is provided on the lower surface of the valve box. The valve plate 42 is configured such that the welded portion is peeled off at a specified pressure by ultrasonic welding to the valve box 41 and the valve is opened. Alternatively, the valve plate is made of resin or the like, and it is broken by a specified pressure so that the valve opens. In the space below the valve plate 42 of the valve box 41, a bag body 20 in which ammonia compound powder is sealed is disposed. When the pressure in the battery rises abnormally and the safety valve opens, the bag of the bag 20 is melted or broken by the jet gas, and the jet gas contacts the ammonia compound powder to prevent ignition. In the case of other types of safety valves, the bag body 20 can be arranged with a space provided in the safety valve portion.

  FIG. 6 shows an example of a power storage device in which a plurality of batteries are arranged in a casing. FIG. 6A shows a case where four nonaqueous electrolyte secondary batteries are arranged in the casings 32 and 33, respectively. One of the batteries arranged in the body 32 shows a state where the safety valve is opened due to an abnormal temperature rise and the jet gas is combusted. In (B), all four batteries arranged in the casing 32 due to the heat of combustion rise in temperature, the safety valve is opened, gas is jetted and burned, and the batteries arranged in the adjacent casing are also included. One shows a state in which the safety valve is opened due to a temperature rise, and gas is ejected and burned. Thus, even if a safety valve is attached to each battery, if the temperature rise of the battery is abrupt and the blown gas is hot, the adjacent battery is affected and the accident spreads in a chain.

  In the case of the non-aqueous electrolyte secondary battery of the present invention, even if it is arranged in this way, ignition is prevented by the ammonia compound arranged in the battery, so that such chain ignition does not occur.

  FIG. 7 shows an example of an electric storage device in which a plurality of nonaqueous electrolyte secondary batteries are stacked in the vertical direction. In the figure, 110 is a non-aqueous electrolyte secondary battery, and 110a is a safety valve of the battery. In the figure, batteries 110 are arranged in five rows and three stages in a casing 111. 111a is a shelf board, 111b is a side wall, 111c is a top plate, 111d is a horizontal flue, 111e is an opening of a duct 126 that leads to the horizontal flue 111d when gas is ejected from the safety valve 110a, and 111f is a vertical flue. . 111g is a ridge protruding downward from the top plate 111c, and a bag body in which ammonia compound powder is sealed is arranged on the ridge, although not clearly shown in the drawing. For example, as shown in FIG. 8 (A), the cage is a cage made of wire mesh. FIG. 8B is a view taken in the direction of arrows YY in FIG. The gutter 111g is disposed above the safety valve 110a of each battery 110. An arrow 100 indicates the direction in which the jet gas flows.

  When the internal pressure of the battery rises above the specified pressure due to an abnormal temperature rise of the battery and the safety valve opens, the gas ejected from the safety valve first collides with the bag body sealed with the ammonia compound powder in the bag placed above the safety valve. Then, the bag is melted or broken to come into contact with the powder of the ammonia compound, and the powder is scattered to cover the jet gas, thereby preventing the jet gas from being ignited.

  Since the gas ejected from the safety valve passes through the horizontal flue 111d and the vertical flue 111f to the flue outlet 112, the bag sealed with the ammonia compound does not necessarily have to be disposed above the safety valve of the battery. You can just place them at the key points. In that case, since the gas ejected from other than the uppermost battery always passes through the vertical flue 111f, the bag is preferably provided in the vertical flue. At that time, a configuration in which, for example, a plurality of bag bodies are arranged at intervals to prevent the flue from being blocked by the bag body, and the jet gas is in contact with the bag body while ensuring the passage of the jet gas. And

  In the electrode of the non-aqueous secondary battery, the electrode active material powder and the conductive auxiliary agent powder are mixed with the binder on the surface of the electrode current collector and formed into a film shape. At least one of the positive electrode and the negative electrode contains ammonium hydrogen carbonate powder and mixed with a binder to form a film. Due to the presence of ammonium bicarbonate, ammonium bicarbonate absorbs oxygen radicals released from the positive electrode active material (lithium-containing transition metal oxide) during thermal runaway when the temperature in the battery rises abnormally, and rapid heat generation is suppressed. In addition, the combustion reaction of the electrolyte is inhibited.

FIG. 9 shows a case where ammonium bicarbonate (NH ₄ ) HCO ₃ was included in the electrode (Example), and an ammonium phosphate (NH ₄ ) H ₂ PO ₄ disclosed in Patent Document 1 (Comparative Example 2). ) And the case where these are not included (Comparative Example 1). It can be seen that the examples including ammonium hydrogen carbonate (NH ₄ ) HCO ₃ deteriorated slightly faster than Comparative Example 1, but significantly slower than Comparative Example 2.

  The safety of a large-capacity power storage device in which a large number of nonaqueous electrolyte secondary batteries are arranged in a housing can be ensured with a compact and inexpensive configuration. In addition, the reliability of each non-aqueous electrolyte secondary battery can be improved without sacrificing cycle characteristics.

It is sectional drawing of the nonaqueous electrolyte secondary battery which concerns on the Example of this invention. It is a figure which shows the state which removed the bag body 20 of FIG. 1 with the perspective view of the battery of FIG. FIG. 2 is a top view of FIG. 1. It is a figure which shows the other Example of an ammonium compound sealing body, (A) is a top view, (B) is XX sectional drawing in (A). It is the figure concerning the other Example of this invention, and the figure which illustrated the case where the ammonium compound sealing body has been arrange | positioned in the space in a safety valve. It is the figure which showed the condition where the accident of one battery spills over to the adjacent battery in the case where a plurality of nonaqueous electrolyte secondary batteries are arranged. It is a figure which shows the Example of this invention in the high capacity | capacitance electric power storage apparatus which has arrange | positioned many nonaqueous electrolyte secondary batteries in three dimensions. FIG. 8 is an enlarged detail view of a portion Z in FIG. 7. It is a graph which shows charging / discharging cycling characteristics.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 2 Positive electrode 3 Negative electrode 4 Separator 5 Battery case 6 Sealing plate 7 Positive electrode terminal 8 Negative electrode terminal 9 Safety valve 12a Positive electrode tab 12b Positive electrode lead 13a Negative electrode tab 13b Negative electrode lead 15 Injection port 16 Insulation part 20 Bag Body 21 Sheet body 31 Non-aqueous electrolyte secondary battery 32, 33 Housing 100 Arrow 110 Non-aqueous electrolyte secondary battery 110a Safety valve 111 Housing 111a Shelf plate 111b Side wall 111c Top plate 111d Horizontal flue 111e Opening 111f Vertical flue 111g籠 120 fire extinguisher

Claims (12)

  In a non-aqueous electrolyte secondary battery having a positive electrode and a negative electrode that mutually release and occlude lithium ions and a non-aqueous electrolyte, the non-aqueous electrolyte does not permeate the ammonium compound in the battery can internal space of the battery. A non-aqueous electrolyte secondary battery characterized by being sealed.   In a non-aqueous electrolyte secondary battery having a positive and negative electrodes, a non-aqueous electrolyte, and a safety valve that mutually release and occlude lithium ions, a space is provided in the passage of the gas flow from the inside of the battery of the safety valve section, 2. The non-aqueous electrolyte secondary battery according to claim 1, wherein an ammonium compound is sealed in the space with a film that does not allow the non-aqueous electrolyte to permeate.   3. The nonaqueous electrolyte secondary battery according to claim 1, wherein the ammonium compound is placed in an internal space of the battery after being sealed in a bag made of an electrically insulating film in a powder state.   2. The non-aqueous electrolyte according to claim 1, wherein the ammonium compound is formed in a sheet form using a binder, hermetically wrapped with an electrically insulating film, and disposed in the internal space of the battery. Next battery.   5. The nonaqueous electrolyte secondary battery according to claim 3, wherein the average particle diameter of the ammonium compound powder is 8 μm to 20 μm.   The non-aqueous electrolyte secondary battery according to claim 1, wherein the film melts at a temperature of 150 ° C. to 250 ° C. 6.   The non-aqueous composition according to claim 4, wherein the binder for forming the ammonium compound powder into a sheet is a binder that softens at a temperature of 150 ° C to 250 ° C and weakens the binding force. Electrolyte secondary battery.   In the power storage device in which a positive electrode, a negative electrode, a non-aqueous electrolyte, and a non-aqueous electrolyte secondary battery each having a safety valve are connected to each other and connected to each other, and arranged in the casing. A power storage device using a non-aqueous electrolyte secondary battery, wherein a bag body in which an ammonium compound powder is sealed in a bag of a polymer material is disposed above the safety valve of each non-aqueous electrolyte secondary battery.   In a power storage device in which a non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a non-aqueous electrolyte, and a safety valve that mutually release and occlude a plurality of lithium ions is connected and arranged in a casing, battery abnormality When a safety valve is activated by heat generation, a flue for guiding gas ejected from the inside of the battery is formed in the casing, and a bag body in which ammonium compound powder is sealed in a polymer material bag at a key point in the flue The power storage device using the non-aqueous electrolyte secondary battery is arranged in a configuration that does not block the flue.   The power storage device using the nonaqueous electrolyte secondary battery according to claim 8 or 9, wherein the average particle diameter of the ammonium compound powder is 8m to 20m.   The power storage device using a non-aqueous electrolyte secondary battery according to claim 8 or 9, wherein the polymer material film melts at a temperature of 150 ° C to 250 ° C.   In a non-aqueous electrolyte secondary battery comprising a positive electrode and a negative electrode that release and occlude lithium ions and a non-aqueous electrolyte, ammonium bicarbonate powder is included in the electrode active material of at least one of the positive electrode and the negative electrode. A non-aqueous electrolyte secondary battery characterized by the above.

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