JP2010033789A - Film-armored electric device assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film-armored electric device assembly capable of safely and reliably exhausting gas without causing a bursting of a film armor body by the generation of gas even when the gas is generated in a closed space inside a film-armored electric device. <P>SOLUTION: The film-armored electric device assembly 10 has a plurality of film-armored electric devices 20 disposed so that the mutually adjacent film-armored electric devices are laminated in a spaced state in a case 11. The plurality of film-armored electric devices are respectively provided with gas exhaust hole forming members having needle-like projections in a spaced state, and a film armor body expanded by the generation of gas in the film-armored electric device through the gas exhaust hole forming member is formed with a gas exhaust hole. The gas is exhausted from this gas exhaust hole. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a film-clad electrical device assembly, and more specifically, a plurality of film-clad electrical devices having a configuration in which an electrical device element such as a battery or a capacitor (capacitor) is covered with a packaging body made of a film. The present invention relates to a film-clad electrical device assembly.

In recent years, a film-clad electrical device having a configuration in which an electrical device element such as a battery element having a configuration in which a positive electrode plate and a negative electrode plate are wound or alternately laminated via a separator is surrounded by an electrolytic solution together with an electrolytic solution ( (External battery) is used as a power source for portable devices and electric vehicles.
Moreover, the film-covered electrical device is applied not only to the exterior battery but also to an apparatus for storing electrical energy, such as a wind power storage device (capacitor).

  Batteries and capacitors having such a structure in which an electric device element is surrounded by a film outer package are overcharged or exposed to a high temperature, so that the electrolyte is electrolyzed or thermally decomposed therein. As a result, flammable gas is generated and the internal pressure may increase.

Thus, in a sealed battery such as an exterior battery, a portion having a weak sealing force (hereinafter also referred to as a “weakly sealed portion”) in a part of the sealing portion of the film exterior body made of a laminate film. When the internal gas pressure rises, this weakly sealed part functions as a gas venting safety valve, and when the internal pressure rises above a predetermined level, it automatically opens and combustible gas The thing etc. which are provided with the safety valve which exhausts etc. outside are proposed (for example, refer patent documents 1-4).
For example, as shown in FIG. 7, an upper exterior film 51 </ b> A and a lower exterior film 51 </ b> B are pasted as a certain type of exterior battery in which a weakly sealed portion is provided in a part of a sealing portion in a film exterior body. A film outer package 50 having a configuration in which a sealing portion 52 formed by heat-sealing films at the periphery is formed over the entire periphery, and an electric device element accommodating space is formed inside. And a configuration in which a thin electric device element (specifically, a battery element) is accommodated together with an organic electrolyte in the electric device element accommodating space of the film outer package 50.
This exterior battery is provided with a safety valve portion 53 formed of a weakly sealed portion at a part of the sealing portion 52 (specifically, approximately the central portion of one long side of the sealing portion 52). Even when a large amount of gas is generated in the film outer package 50 due to the action of the safety valve portion 53, the pressure is released by releasing the gas from the safety valve portion 53 to prevent the film outer package 50 from bursting. is doing. Specifically, the safety valve portion 53 has a structure in which the sealing strength in the sealing portion 52 is partially reduced, and the internal pressure of the electrical device element accommodating space in which the electrical device element (battery element) is accommodated is When it reaches a predetermined value, it has a configuration that peels preferentially prior to other parts.
In the example of this figure, the film outer package 50 has a rectangular outline shape, and as a positive electrode lead member common to a plurality of positive electrode plates constituting an electric device element (battery element) from two sides on the short side side. The positive electrode power tab 22A and the negative electrode power tab 22B as a negative electrode lead member common to the plurality of negative electrode plates are drawn out.

However, in an exterior battery having a configuration in which a weakly sealed portion is provided in a part of the sealing portion of the film exterior body, the gas discharge standard is not constant with respect to the gas pressure, and thus sufficient safety cannot be obtained. , Etc.
In addition, the exterior battery having a configuration provided with a safety valve has problems such that handling is not easy and the manufacturing cost is increased.

  Such a problem is not limited to an exterior battery, and other exterior electrical devices having a configuration in which a component having a possibility of generating a gas is covered with a film exterior body and housed in an enclosed space inside the film exterior body ( This can also occur in common in capacitors, for example.

JP 05-314959 A Japanese Patent Laid-Open No. 05-013061 Japanese Patent Laid-Open No. 11-086823 JP 2006-236605 A

  The present invention has been made on the basis of the above circumstances, and the object thereof is due to the generation of the gas even when the gas is generated in the sealed space inside the film-covered electrical device. An object of the present invention is to provide a film-clad electrical device assembly that can safely and reliably discharge the gas without causing a rupture in the film-clad body.

The film-clad electrical device assembly of the present invention is a film-clad electrical device assembly comprising a plurality of film-clad electrical devices having a configuration in which electrical device elements are housed together with an electrolyte inside the film-clad body,
The plurality of film-clad electrical devices are arranged in the case so as to be laminated in a state where the film-clad electrical devices adjacent to each other are spaced apart from each other. A gas discharge hole forming member having a
The gas discharge hole forming member has a configuration in which a gas discharge hole is formed in the film exterior body expanded by the generation of gas in the film exterior electrical device, and the gas is discharged from the gas discharge hole. And

  In the film-clad electrical device assembly of the present invention, a gas discharge hole forming member is preferably provided in each gap between the film-clad electrical devices.

  In the film-clad electrical device assembly of the present invention, when the distance between the film-clad electrical device and the tip of the needle-like protrusion in the gas discharge hole forming member is L, the thickness of the film-clad electrical device is L It is preferably / 2 to L.

  In the film-clad electrical device assembly of the present invention, it is preferable that the needle-like protrusions in the gas discharge hole forming member have a length that is 1.5 to 5 times the thickness of the film-clad body in the film-clad electrical device.

  In the film-clad electrical device assembly according to the present invention, the film-clad electrical device has a plurality of positive electrode plates and negative electrode plates alternately stacked via separators, and the plurality of positive electrode plates have a common positive electrode. In addition to being electrically connected to the lead member, a plurality of negative electrode plates are electrically connected to a common negative electrode lead member, and the electric device element has two sheet-like bodies superimposed on each other. The positive electrode lead member and the negative electrode lead together with the electrolytic solution are contained in the sealed space for accommodating the electric device element of the film outer package in which the sealed space for accommodating the electric device element is formed inside by heat sealing the periphery thereof. It is preferable to have a configuration in which each tip portion of the member is accommodated in a protruding state.

  In the film-clad electrical device assembly of the present invention, the film-clad electrical device is preferably an organic electrolyte battery or an organic electrolyte capacitor.

In the film-clad electrical device assembly of the present invention, when a gas is generated in each of the film-clad electrical devices constituting the film-clad electrical device assembly, Since the gas discharge hole forming member for forming the gas discharge hole is provided in the film outer casing expanded due to the occurrence of the gas, even when gas is generated inside the film outer electrical device, Before the film outer package ruptures due to the generation of the gas, the gas exhaust hole can be surely formed in the expanded film outer package to discharge the gas.
Therefore, according to the film-clad electrical device assembly of the present invention, even when gas is generated in the sealed space inside the film-clad electrical device, the film-clad body is ruptured due to the generation of the gas. The gas can be safely and reliably discharged without causing it to occur.

  In the film-covered electrical device assembly of the present invention, when the distance between the film-covered electrical device and the tip of the needle-like protrusion in the gas discharge hole forming member is L, the thickness of the film-wrapped electrical device is L / 2 to L, and the needle-like protrusions in the gas discharge hole forming member have a length of 1.5 to 5 times the thickness of the film outer package in the film outer package, When the film-covered electrical device assembly is assembled or in a normal operating state, it is possible to prevent the needle-like projections of the gas discharge hole forming member from contacting the exterior film unnecessarily, and when gas is generated, Before the outer film ruptures, it is possible to reliably form a gas discharge hole in the film outer package, and when forming the gas discharge hole, Caused part it is also possible to avoid causing a short circuit by touching the electrical device element.

  Hereinafter, embodiments of the present invention will be described in detail.

FIG. 1 is an explanatory perspective view showing an example of the configuration of the film-covered electrical device assembly of the present invention, and FIG. 2 is an explanatory AA showing the internal configuration of the film-covered electrical device assembly of FIG. It is sectional drawing, (a) is explanatory drawing in which the several film exterior electrical device which comprises a film exterior electrical device aggregate | assembly shows a normal state (normal operation state), (b) is film exterior electrical FIG. 3 is an explanatory view showing a state where gas is generated in the device, FIG. 3 is an enlarged view of a main part of the film-covered electrical device assembly of FIG. 1, and FIG. 4 is a film-wrapped electrical device assembly of FIG. It is an assembly perspective view for explaining composition of a film exterior electric device which constitutes.
This film-clad electrical device assembly 10 is such that the film-clad electrical device 20 is composed of a lithium ion capacitor that is a kind of organic electrolyte capacitor.

The film-clad electrical device assembly 10 is arranged such that a plurality (six in the example in the figure) of film-clad electrical devices 20 are stacked in the case 11 in a state where adjacent ones are separated from each other. .
Each of the plurality of film-clad electrical devices 20 is held and fixed in an intended state at an intended position by an appropriate positioning and fixing member (not shown) in the case 11.
In the example of this figure, each of the plurality of film-clad electrical devices 20 is accommodated in a state in which the respective leading ends of the positive electrode power tab 22A and the negative electrode power tab 22B protrude.

  The film-clad electrical device 20 that constitutes the film-clad electrical device assembly 10 includes an upper exterior film 31 </ b> A and a lower exterior film 31 </ b> B bonded together, and a hermetic sealing portion in which the films are heat-sealed to the periphery. 32 is formed over the entire circumference, and is provided with a film exterior body 30 having a configuration in which an electrical device element accommodating sealed space is formed therein. Electricity is contained in the electrical device element accommodating sealed space of the film exterior body 30. The device element 21 is configured to be accommodated together with an organic electrolyte.

  As the film exterior body 30 (upper exterior film 31A and lower exterior film 31B) constituting the film exterior electrical device 20, for example, a laminate in which a PP (polypropylene) layer, an aluminum layer, a nylon layer, and the like are laminated from the inside is suitably used. Can be used.

  The electrical device element 21 constituting the film-clad electrical device 20 is formed by alternately laminating a plurality of positive plates and negative plates via separators, and these positive plates are used as a common positive lead member, for example, made of aluminum. It is electrically connected to the positive electrode power tab 22A and has a configuration in which a plurality of negative electrode plates are electrically connected to a negative electrode power tab 22B made of, for example, copper as a common negative electrode lead member, The positive electrode power tab 22 </ b> A and the negative electrode power tab 22 </ b> B are housed in the sealed space for accommodating the electric device elements of the film outer package 30 together with the organic electrolyte solution.

As the negative electrode plate constituting the electric device element 21, a material obtained by molding an electrode material with a binder is used. The electrode material of the negative electrode plate is not particularly limited as long as it can reversibly carry lithium. Examples thereof include graphite, various carbon materials, polyacene-based materials, tin oxides, powdered powders such as silicon acid compounds, and granular negative electrode active materials.
Moreover, as a positive electrode plate which comprises the electric device element 21, what shape | molded the electrode material by adding a conductive material (for example, activated carbon, carbon black, etc.), a binder, etc. as needed is used, and the electrode of a positive electrode plate is used. The material is not particularly limited as long as it can carry lithium reversibly. For example, a general formula such as LiCoO ₂ , LiNiO ₂ , LiFeO ₂ : LixMyOz (where M represents a metal atom, x, y and z is an integer.) and a positive electrode active material such as an organometallic oxide.

In addition, the organic electrolyte is obtained by dissolving an electrolyte in an appropriate solvent. Examples of the solvent include aprotic organics such as ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, acetonitrile, and dimethoxyethane. A solvent is mentioned, These can also be used individually or in combination of 2 or more types. Further, as the electrolyte, can generate lithium ions, for example LiI, LiCIO _4, LiAsF _4, such as LiBF ₄ and the like.

  The film-clad electrical device 20 having such a configuration, for example, surrounds the electrical device element 21 from both sides in the thickness direction (up and down direction) between the upper exterior film 31A and the lower exterior film 31B, and heats the entire periphery. The electrical device element 21 can be manufactured by undergoing a process of reliably hermetically sealing by fusing.

The film-covered electrical device assembly 10 is provided with a gas discharge hole forming member 15 having needle-like protrusions 16 spaced from each of the plurality of film-wrapped electrical devices 20.
The gas discharge hole forming member 15 is held and fixed in an intended state at an intended position by an appropriate positioning and fixing member (not shown).

  The gas discharge hole forming member 15 forms a gas discharge hole in the film exterior body 30 expanded due to the generation of gas when gas is generated in the film exterior electrical device 20 (FIG. 2 (b)).

  The gas discharge hole forming member 15 contacts the film-clad electrical device 20 when the film-clad electrical device 20 is in a normal state (normal operation state), that is, when no gas is generated inside the film-clad body 30. In the case where gas is generated in the film-covered electrical device 20, before the film-covered body 30 ruptures due to the generation of this gas, What is necessary is just to have arrange | positioned in the appropriate position and state so that it may contact, and what has a shape which can form a hole in the said film exterior body 30 easily by this contact.

The gas discharge hole forming member 15 is preferably provided in each gap between the film-clad electrical devices 20 in the case 11.
In the example of this figure, one gas discharge hole forming member 15 corresponds to one film-covered electrical device 20, and each of these gas discharge hole forming members 15 has an L-shape. The tip of the needle-like protrusion 16 is provided at a position facing the central portion of the film-covered electrical device 20.

Moreover, the separation distance W between the film-covered electrical device 20 and the tip of the needle-like protrusion 16 in the gas discharge hole forming member 15 is when the thickness of the film-wrapped electrical device 20 is L (usually 2 to 20 mm). L / 2 to L are preferable.
By arranging in this way, the needle-like projections 16 of the gas discharge hole forming member 15 are unnecessarily in contact with the film exterior body 30 and are damaged when the film exterior electrical device assembly 10 is assembled or in a normal operating state. There is no. Further, when gas is generated, it is possible to reliably form a gas exhaust hole in the film exterior body 30 before the film exterior body 30 is ruptured, and to form a needle when forming the gas exhaust hole. It is also avoided that the protrusion 16 touches the electric device element 21 to cause a short circuit.
Here, in the specification, the “thickness L of the film-covered electrical device” used as a reference for the distance between the film-wrapped electrical device 20 and the tip of the needle-like protrusion 16 in the gas discharge hole forming member 15 is: It is the thickness of the film-clad electrical device 20 in a normal state (normal operating state), that is, in a state where no gas is generated inside the film-clad body 30.

Moreover, it is preferable that the length P of the needle-shaped projection part 16 in the gas discharge member 15 is 1.5 to 5 times the thickness of the film exterior body 30 in the film exterior electrical device 20.
With such a configuration, the needle-like protrusion 16 of the gas discharge hole forming member 15 is unnecessarily in contact with and damaged by the film discharge body 30 during assembly of the film-covered electrical device assembly 10 or in a normal operating state. There is nothing.
When the film outer package 30 is formed by laminating a PP (polypropylene) layer, an aluminum layer, and a nylon layer from the inside, the thickness is usually 50 to 300 μm.

  Examples of the material of the gas discharge hole forming member 15 include a corrosion-resistant metal, ceramics, or a hard resin.

  The film-covered electrical device assembly 10 having such a configuration is accommodated in a case 11 so that a plurality of film-wrapped electrical devices 20 and gas discharge hole forming members 15 are stacked, for example, It can be manufactured by sealing so that the gas discharged by forming the gas discharge hole in the film outer package 30 of the electric device 20 is not discharged outside the case 11.

In the film-covered electrical device assembly 10 described above, when gas is generated in each of the film-covered electrical devices 20 constituting the film-covered electrical device assembly 10, Since the gas discharge hole forming member 15 for forming the gas discharge hole is provided in the film exterior body 30 expanded due to the generation of the gas, it is overcharged or exposed to a high temperature. Even in the case where the combustible gas is generated due to the electrolysis or thermal decomposition of the electrolytic solution inside the film-covered electrical device 20, even when the internal pressure is increased, Before the film outer package 30 ruptures, it is possible to reliably form a gas discharge hole in the expanded film outer package 30 and discharge the gas. Kill.
Therefore, according to the film-clad electrical device assembly 10, even when gas is generated in the sealed space inside the film-clad electrical device 20, the film-clad body 30 is ruptured due to the generation of the gas. The gas can be safely and reliably discharged without causing it to occur.

  Further, according to the film-clad electrical device assembly 10, the distance between the film-clad electrical device 20 and the tip of the needle-like protrusion 16 in the gas discharge hole forming member 15 is set as the thickness of the film-clad electrical device 20 as L. , L / 2 to L, and the needle-like protrusion 16 in the gas discharge hole forming member 15 is 1.5 to 5 times as long as the thickness of the film exterior body 30 in the film exterior electrical device 20 When the film-covered electrical device assembly 10 is assembled or in a normal operating state, the needle-like projections 16 of the gas discharge hole forming member 15 are unnecessarily in contact with the film-covering body 30 and are damaged. In the case where a gas is generated, the film surely is ruptured before the film outer package 30 is ruptured. A gas discharge hole can be formed in the body 30, and the occurrence of a harmful effect that the needle-like protrusion 16 touches the electric device element 21 to cause a short circuit when the gas discharge hole is formed can be avoided. Can do.

  The film-covered electrical device assembly of the present invention having such a configuration can be applied to a film-covered electrical device that is an organic electrolyte battery in addition to an organic electrolyte capacitor such as a lithium ion capacitor. Since the organic electrolyte capacitor has a structure that can be charged and discharged instantaneously although its charging capacity is smaller than that of the organic electrolyte battery, there is a possibility that the gas pressure change will be large. It is effective when it consists of an organic electrolyte capacitor.

As mentioned above, although the film-clad electric device of this invention was demonstrated concretely, this invention is not limited to the above example, A various change can be added.
For example, the gas discharge hole forming member is provided with a gas discharge hole forming member having a needle-like protrusion portion separated from each of the plurality of film-covered electrical devices, Any structure may be used as long as it has a configuration capable of forming a gas discharge hole in the film exterior body expanded by the occurrence of the above.
Specifically, FIG. 5 and FIG. 6 show sectional views for explaining another example of the configuration of the film-covered electrical device assembly of the present invention.
This film-clad electrical device assembly 40 basically has the same configuration as the film-clad electrical device assembly 10 in FIG. 1, and the gas discharge hole forming member 45 has an I-shape. Yes, six gas discharge hole forming members 45 are provided for one film-covered electric device 20, and any gas discharge hole forming member 45 is provided in each of two adjacent film-covered electric devices 20. It has a function of forming a gas discharge hole. 5 and 6, reference numeral 47 denotes a support fixing member for supporting and fixing the gas discharge hole forming member 45, the end of which is fixed to the case 11 and provided in parallel with the direction in which the film-covered electrical device 20 extends. It is. Further, in the same figure, the needle-like protrusion 46 of the gas discharge hole forming member 45 is constituted by a portion protruding from the support fixing member 47.

It is an explanatory perspective view which shows an example of a structure of the film-clad electrical device assembly of this invention. It is AA sectional drawing for description which shows the structure inside the film-clad electrical device aggregate | assembly of FIG. 1, Comprising: (a) is a normal state with the several film-clad electrical device which comprises a film-clad electrical device aggregate | assembly. It is explanatory drawing which shows (normal operation state), (b) is explanatory drawing which shows the state which gas generate | occur | produced in the film-clad electrical device. It is an enlarged view of the principal part of the film-clad electrical device assembly of FIG. It is an assembly perspective view for demonstrating the structure of the film-clad electrical device which comprises the film-clad electrical device aggregate | assembly of FIG. It is sectional drawing for description which shows the other example of a structure of the film-clad electrical device aggregate | assembly of this invention, Comprising: Explanation that the film-clad electrical device which comprises a film-clad electrical device aggregate | assembly shows a normal state (normal operation state) FIG. It is an enlarged view of the principal part of the film-clad electrical device assembly of FIG. It is an assembly perspective view for demonstrating an example of the structure of the conventional film-clad electrical device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Film exterior electrical device assembly 11 Case 15 Gas discharge hole formation member 16 Needle-shaped protrusion 20 Film exterior electrical device 21 Electrical device element 22A Positive electrode power tab 22B Negative electrode power tab 30 Film exterior body 31A Upper exterior film 31B Lower exterior film 32 Hermetic sealing portion 40 Film exterior electrical device assembly 45 Gas discharge hole forming portion member 46 Needle-like protrusion 47 Support fixing member 50 Film exterior body 51A Upper exterior film 51B Lower exterior film 52 Sealing portion 53 Safety valve portion

Claims (6)

A film-covered electric device assembly comprising a plurality of film-covered electric devices having a structure in which an electric device element is housed together with an electrolyte inside the film-covered body,
The plurality of film-clad electrical devices are arranged in the case so as to be laminated in a state where the film-clad electrical devices adjacent to each other are spaced apart from each other. A gas discharge hole forming member having a
The gas discharge hole forming member has a configuration in which a gas discharge hole is formed in the film exterior body expanded by the generation of gas in the film exterior electrical device, and the gas is discharged from the gas discharge hole. Film exterior electrical device assembly.   The film-covered electrical device assembly according to claim 1, wherein a gas discharge hole forming member is provided in each gap between the film-wrapped electrical devices.   The distance between the film-covered electrical device and the tip of the needle-like protrusion in the gas discharge hole forming member is L / 2 to L, where L is the thickness of the film-wrapped electrical device. The film-clad electrical device assembly according to claim 1 or claim 2.   The needle-like protrusion in the gas discharge hole forming member has a length of 1.5 to 5 times the thickness of the film outer package in the film-coated electric device. The film-clad electrical device assembly as described.   In the film-clad electrical device, a plurality of positive electrode plates and negative electrode plates are alternately laminated via separators, and the plurality of positive electrode plates are electrically connected to a common positive electrode lead member. The negative electrode plate is electrically connected to a common negative electrode lead member, and the electric device element is formed by superimposing two sheet-like bodies and thermally fusing the peripheral edge thereof. Housed in the sealed space for accommodating electrical device elements of the film outer package in which the sealed space for housing electrical device elements is formed, with the electrolyte solution and the tip of each of the positive electrode lead member and the negative electrode lead member protruding. The film-covered electrical device assembly according to any one of claims 1 to 4, wherein the film-covered electrical device assembly has the structure described above.   The film-clad electrical device assembly according to any one of claims 1 to 5, wherein the film-clad electrical device is an organic electrolyte battery or an organic electrolyte capacitor.

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