WO2006067979A1

WO2006067979A1 - Case for film jacket electric device

Info

Publication number: WO2006067979A1
Application number: PCT/JP2005/022654
Authority: WO
Inventors: Takeshi Kanai
Original assignee: Nec Corporation; Fuji Jukogyo Kabushiki Kaisha
Priority date: 2004-12-21
Filing date: 2005-12-09
Publication date: 2006-06-29
Also published as: JPWO2006067979A1; JP4977475B2

Abstract

A case for a film jacket electric device capable of eliminating the affection of a gas produced when a battery causes a trouble on a human body by securely discharging the gas to an exhaust gas passage. A cell case (10) surrounding the periphery of a film jacket battery (1) comprises a first frame body (11) and a second frame body (12), and the film jacket battery (1) is held between the holding surfaces of the first and second frame bodies. The frame bodies (11) and (12) are formed in frame shapes, and an opening part (13) is formed in the frame bodies at a position corresponding to the power generation element (2) of the film jacket battery (1). The exhaust gas passage (11c) for discharging the gas produced when the battery causes the trouble through a gas discharge part formed in the film jacket battery (1) is formed at the center part of the opening parts (13). Sealing members (30) fitted to the surface of the film jacket battery (1) are fitted to both side edges of the exhaust gas passage (11c), and the exhaust gas passage (11c) is cut off from the opening part (13) by the sealing materials (30).

Description

Specification

Case for film exterior electrical device

Technical field

The present invention relates to a film-covered electrical device case for storing a film-covered electrical device in which an electrical device element typified by a battery or a capacitor is stored in a package film.

Background art

[0002] In recent years, the development of electric vehicles and hybrid electric vehicles (hereinafter also simply referred to as “electric vehicles etc.”) equipped with motor-driven knotters is being promoted rapidly. Naturally, batteries mounted on electric vehicles and the like are also required to be lighter and thinner in order to improve the driving characteristics and mileage of electric vehicles. In order to make the battery lighter and thinner, a film-clad battery using a laminate material having a thin film strength has been developed for the outer package. In general, a laminate material has a structure in which both surfaces of a thin metal layer such as aluminum are covered with a thin resin layer, which is resistant to acids and alkalis, and is lightweight and flexible.

[0003] A film-covered battery in which a power generation element is covered with a laminate material has an advantage that it is lightweight! However, it is easy to be affected by vibration and impact with low rigidity, so it is necessary to solve these problems when mounted on electric vehicles. In order to solve this problem, as disclosed in JP-A-10-012278, a technique for sandwiching and fixing a film-clad battery in a case is conventionally known.

[0004] Further, in order to obtain a battery suitable for an electric vehicle or the like, it is desired to increase the capacity and output of the battery. For this reason, film-coated batteries contained in a plurality of cases are stacked and electrically connected, so-called assembled batteries are being made. At this time, for the purpose of cooling each film-covered battery, the case force in which the film-covered battery is put is formed so that an appropriate ventilation gap is formed between the film-covered batteries when it is assembled into an assembled battery. Yes. When such an assembled battery is mounted on an electric vehicle or the like, normally, air taken from the passenger compartment is introduced as a cooling air into the ventilation gap between the film exterior batteries, and the ventilation gap The cooling air heated up after a while is discharged from the vehicle.

[0005] Further, a film-clad battery is obtained by inserting a power generation element between opposing laminate materials and welding the peripheral edge of the laminate material by heat welding. The heat-sealed part of the film-clad battery is provided with a gas discharge part in which a part of the heat-sealed part is peeled off at a lower pressure than the other part.

[0006] During use of the battery, if a voltage outside the standard range is applied to the battery, gas species may be generated due to electrolysis of the electrolyte solvent, and the internal pressure of the battery may increase. Furthermore, even if the battery is used at a high temperature outside the standard range, gas species are generated due to decomposition of the electrolyte salt. Therefore, basically, it is ideal to use a battery within the standard range so as not to generate gas. However, if the battery control circuit fails for some reason and an abnormal voltage is applied, or if the surroundings become abnormally hot for some reason, a large amount of gas is generated in some cases.

[0007] Such generation of gas inside the battery causes an increase in the internal pressure of the battery. In order to prevent the internal pressure from rising excessively and the battery from exploding, many batteries using metal cans as exterior materials have a pressure relief valve that allows gas to escape outside the battery when the internal pressure of the battery rises. . However, it is structurally difficult to provide a pressure safety valve in a film-clad battery that uses a film as a packaging material. In the case of a film-clad battery, if the internal pressure rises too much, the film expands, eventually rupturing the exterior material and ejecting gas at that location. However, it is not possible to determine where the rupture occurs, so depending on the ruptured location, the surrounding equipment may be adversely affected.

[0008] Therefore, in the film-clad battery, in order to eliminate the problems caused by the generation of gas inside the battery, the gas discharge part as described above is provided in the heat-sealing part. Further, as shown in FIG. 1, a gas discharge port 103 is formed in the case 102 of the film-clad battery 101 so as to surround the gas discharge part 104 provided in the film-clad battery 101. In addition, when mounted on an electric vehicle or the like in a state where a battery pack with a case is overlapped to form an assembled battery, the gas discharge port 103 is connected to a partitioned exhaust gas passage for discharging gas out of the vehicle.

However, in the case of the conventional case shape as shown in FIG. 1, the gas discharge port 103 is only formed so as to surround the gas discharge portion 104 of the film exterior battery 101, and the case When the battery is assembled into an assembled battery, it communicates with the opening 102a that becomes a ventilation gap (cooling passage) between the film-clad batteries. For this reason, when gas is generated due to battery abnormality, if the gas is not quickly discharged to the exhaust gas passage through the gas discharge port 103 provided in the case, it will leak into the opening 102a which is the cooling passage. There is. Since this cooling passage is connected to the vehicle interior, if gas enters here, the gas will flow back into the vehicle interior, which may adversely affect the human body.

Disclosure of the invention

[0010] In view of the above-described problems of the prior art, the present invention provides a case for a film-clad battery that reliably discharges gas generated when a battery malfunctions to the exhaust gas passage and does not affect the human body. Objective.

[0011] To achieve the above object, the present invention provides a film exterior having a chargeable / dischargeable electrical device element, an exterior film sealed with the electrical device element sandwiched therebetween, and a gas discharge portion provided on the exterior film. The present invention relates to a film-covered electrical device case that houses electrical devices. In this case, an opening is formed in a region corresponding to the electric device element, and the frame member that holds the peripheral edge of the electric device element in the exterior film is connected to the opposite side of the frame member. An exhaust gas passage portion for guiding the gas discharged from the gas discharge portion of the exterior electrical device to the outside. A sealing material that partitions the exhaust gas passage portion into an opening force by adhering to the surface of the film external electrical device on both side edges of the surface of the exhaust gas passage portion that faces the film exterior electrical device. Is provided.

[0012] It is also preferable that the sealing material is provided along both side edges of the exhaust gas passage portion also on the outer surface of the exhaust gas passage portion.

[0013] In the invention configured as described above, the exhaust gas passage portion is completely partitioned from the opening portion serving as a cooling passage (ventilation gap). As a result, even if the gas discharge part force gas provided in the film-covered electrical device is generated when the battery is abnormal, the gas does not leak into the opening serving as a cooling passage. Therefore, the gas from the gas discharge section is surely discharged into the exhaust gas passage that guides the gas to the outside of the vehicle. In addition, since the gas does not enter the opening, which is a cooling passage connected to the passenger compartment, there is no influence on the human body. [0014] In the case for the film-clad electrical device, it is conceivable that the sealing material is a foamable resin or an ultraviolet curable resin.

[0015] As described above, according to the present invention, it is possible to provide a film-covered battery case that reliably discharges gas generated when a battery is abnormal to the exhaust gas passage and does not affect the human body. .

Brief Description of Drawings

FIG. 1 is a perspective view showing the shape of a conventional case containing a film-clad battery.

FIG. 2 is an external perspective view of a film-clad battery applicable to the present invention.

FIG. 3 is an exploded perspective view of an example of a cell case of the present invention that houses a film-clad battery. FIG. 4 is a perspective view of a cell case that houses a film-clad battery.

FIG. 5 is a cross-sectional view taken along the line XX ′ of FIG. 4, showing a film-clad battery and a cell case in which the film-clad battery is stored.

FIG. 6 is a schematic cross-sectional view showing a state in which cell cases containing the film-clad battery of FIG. 5 are stacked to form an assembled battery.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an external perspective view of the film-clad battery of this embodiment.

[0019] The film-clad battery 1 of the present embodiment includes a power generation element 2 having a positive electrode side active electrode, a negative electrode side active electrode, and an electrolyte, a metal film such as aluminum, and a heat-fusible resin film. And a laminate film 7 formed together. The film-clad battery 1 has a structure in which the power generating element 2 is sealed with two laminated films 7. That is, when the power generating element 2 is hermetically sealed with the two laminate films 7, among the four heat-bonding portions 7a of the laminate film 7, first, three sides are heat-sealed to form a bag shape. Then, the internal air is exhausted from the remaining one side that is open and evacuated, and then the remaining one side heat-sealing part 7a is heat-sealed.

[0020] The power generation element 2 of the film-clad battery 1 may be of a laminated type including a positive electrode side active electrode and a negative electrode side active electrode laminated via a separator. Alternatively, the belt-like positive electrode side active electrode and the negative electrode side active electrode are stacked via a separator, wound, and then compressed into a flat shape. The positive electrode side active electrode and the negative electrode side active electrode may be a wound type having a structure in which the positive electrode side active electrode and the negative electrode side active electrode are alternately stacked.

[0021] Further, as the power generation element 2, any power generation element used in a normal battery can be applied as long as it includes a positive electrode, a negative electrode, and an electrolyte. The power generation elements in a typical lithium ion secondary battery include a positive electrode plate coated with a positive electrode active material such as lithium 'manganese complex oxide or lithium cobaltate on both sides of an aluminum foil, and lithium doped or dedoped. A negative electrode plate in which a possible carbon material is applied on both sides of a copper foil is opposed to each other through a separator, and is impregnated with an electrolyte containing a lithium salt. Examples of the power generation element 2 include power generation elements of other types of chemical batteries such as a nickel metal hydride battery, a nickel cadmium battery, a lithium metal primary battery, a secondary battery, and a lithium polymer battery. Furthermore, the present invention relates to an electric device element that accumulates electrical energy and generates gas by chemical reaction or physical reaction, such as a capacitor element exemplified by a capacitor such as an electric double layer capacitor or an electrolytic capacitor. It is also applicable to electrical devices sealed with an exterior film.

[0022] From the heat-sealed portion 7a in the short direction of the film-coated battery 1, the positive electrode terminal 3 connected to the positive electrode side active electrode and the negative electrode terminal 4 connected to the negative electrode side active electrode are opposed to each other. And then extend. Aluminum is often used as the positive electrode terminal 3! /. As the negative electrode terminal 4, copper or nickel is often used due to its electrical characteristics. Hereinafter, the positive electrode terminal 3 and the negative electrode terminal 4 may be simply referred to as electrodes.

[0023] A part of the heat-sealed portion 7a in the longitudinal direction of the film-clad battery 1 has a lower heat-sealing strength than other portions, and is fused at a lower pressure than other portions when gas is generated. A gas discharge part 8 is provided so as to be peeled off.

FIG. 3 shows an exploded perspective view of a cell case that houses a film-clad battery.

[0025] A cell case 10 surrounding the periphery of the film-clad battery 1 has a first frame 11 and a second frame 12, and the film-clad battery 1 is sandwiched between the first and second frames 11 and 12 between them. It has become. Each of the frames 11 and 12 has a frame shape. An opening 13 is formed at a location corresponding to the power generation element 2 of the film-clad battery 1. [0026] The first frame 11 is a rectangular frame comprising two long sides 11a facing each other and two short sides l ib formed substantially orthogonal to the long sides 11a and facing each other. is there. Each long side 11a is connected by an exhaust gas passage portion 11c for guiding the gas discharged from the gas discharge portion 8 of the film exterior battery 1 to the outside. In this embodiment, since the gas discharge part 8 of the film-clad battery 1 is formed in the approximate center of the heat-sealed part 7a, the exhaust gas passage 11c is also formed in the approximate center of the long side 11a. The opening 13 is divided into two. Further, a cutout id for forming the gas discharge port 16 is formed at one end of the long side 11a and at one end of the exhaust gas passage portion 11c.

[0027] Each short side 1 lb of the first frame 11 is housed in the cell case 10 !, and there are notches l ie for extending the electrodes of the film external battery 1 in the state of being extended to the outside. Is formed.

[0028] Sealing portions for blocking communication of the exhaust gas passage portion 1 lc with the opening portion 13 on both side edges of the surface of the exhaust gas passage portion 11c facing the film-clad battery 1 as described later. 30 is provided. Further, the sealing portion 30 is provided along both side edges of the exhaust gas passage portion 1 lc also on the outer surface of the exhaust gas passage portion 11c.

[0029] The sealing material 30 is preferably urethane-based or butyl-based foamable resin. In the case where the encapsulant 30 is cured after being filled into the storage portion 15, it is more preferable to use an ultraviolet curable resin that is not a thermosetting resin. This is because, in the case of an ultraviolet curable resin, it is cured by irradiating with ultraviolet rays, so that it does not adversely affect the film-covered battery 1 at the time of curing.

The basic structure of the second frame 12 is the same as that of the first frame 11. The second frame 12 is also a rectangular frame composed of two long sides 12a and two short sides 12b, and a notch 12d for forming a gas outlet 16 is formed on one of the long sides 12a. Further, the second frame 12 is provided with an electrode holding portion 12e that fits into the notch l ie of the first frame 11. The electrode holding portion 12e is formed to have a thickness that allows an opening through which the electrode can be extended while being fitted in the notch l ie.

[0031] Next, a procedure for storing the film-cased battery 1 in the cell case 10 will be described.

[0032] First, the film-clad battery 1 is sandwiched between the long side 11a of the first frame 11 and the long side 12a of the second frame 12 with the longitudinal heat-sealing portion 7a therebetween, , Heat-sealed part in the short direction 7 A is sandwiched between the short side l ib and the short side 12b. That is, heat fusion is performed on the sandwiching surface between the first frame body 11 and the second frame body 12 (the surface that faces when the first frame body 11 and the second frame body 12 are opposed to each other). Hold the landing part 7a. At this time, the gas discharge part 8 is positioned at the gas discharge port 16.

FIG. 4 shows a perspective view of the film-cased battery 1 housed and held in the cell case 10. In FIG. 4, the electrodes 3 and 4 are shown in a folded state. FIG. 5 is a schematic cross-sectional view of the film-cased battery 1 and the cell case 10 in which the film-cased battery 1 is stored, taken along the line XX ′ of FIG.

As shown in FIGS. 4 and 5, the portion exposed at the opening 13 of the film-clad battery 1 is open to the atmosphere, so that the cooling air is directly applied to the surface of the film-clad battery 1. Since it can cool, a favorable cooling characteristic can be acquired. When a plurality of cell cases 10 containing the film-clad battery 1 are stacked to form an assembled battery, the opening 13 serves as a ventilation gap as a cooling passage. Further, sealing materials 30 that are in close contact with the surface of the film-clad battery 1 are provided on both side edges of the surface of the exhaust gas passage portion 11c that faces the film-clad battery 1. By this sealing material 30, the exhaust gas passage portion 11c becomes a passage that is completely partitioned by the opening 13 on the first frame 11 side (see FIG. 5).

[0035] As described above, the exhaust gas passage portion 11c is completely partitioned from the opening 30 serving as a cooling passage (ventilation gap). Will not leak at least to the opening 13 on the first frame 11 side.

[0036] As described above, regarding the opening 13 on the first frame 11 side where the exhaust gas passage portion 11c is provided, the gas discharged from the gas discharge portion 8 of the film-covered battery 1 is discharged to the exhaust gas passage portion 11c. It can be completely retained inside and prevented from leaking into the opening 13 on the first frame 11 side. On the other hand, regarding the opening 13 on the second frame 12 side where the exhaust gas passage portion 11c is not provided, the gas discharged from the gas discharge unit 8 leaks to the opening 13 on the second frame 12 side. Can be considered. Therefore, as shown in FIG. 5, by providing sealing material 30 on both side edges of the outer surface of the exhaust gas passage portion 11c, the gas discharged from the gas discharge portion 8 is opened to the second frame 12 side. Part 13 is not leaked. Specifically, as shown in FIG. 6, when the cell case 10 in which the film-clad battery 1 is housed, the exhaust gas passage portion 11c provided in the opening 13 on the first frame 11 side is overlapped. The adjacent cell cases 10 are arranged in the opening 13 on the second frame 12 side. At this time, the sealing material 13 provided on the outer surface of the exhaust gas passage portion 11c is in close contact with the surface of the film-coated battery 1 in the opening 13 on the second frame body 12 side of the adjacent cell case 10. . For this reason, the exhaust gas passage portion 11c disposed in the opening 13 on the second frame 12 side is also a passage that is completely partitioned from the opening 13 on the second frame 12 side. As a result, even if gas is generated from the gas discharge part 8 of the film-clad battery 1 when the battery is abnormal, it does not leak into the opening 13 on the second frame 12 side.

[0038] Due to the above, the gas from the gas discharge part 8 is reliably discharged to the exhaust gas passage for guiding the gas to the outside of the vehicle through the exhaust gas passage part 11c and the gas discharge port 16 provided in the cell case 10. It will be. In addition, since gas does not enter the opening 13 which is a cooling passage connected to the passenger compartment, there is no influence on the human body.

Claims

The scope of the claims

[1] For a film-clad electrical device that houses a film-clad electrical device having a chargeable / dischargeable electrical device element, an exterior film sealed with the electrical device element sandwiched therebetween, and a gas discharge part provided in the exterior film A case,

An opening is formed in a region corresponding to the electrical device element, and a frame member that holds a peripheral edge of the electrical device element in the exterior film;

An exhaust gas passage portion for guiding the gas exhaust force of the film-covered electrical device, which is provided so as to connect opposite sides of the frame member, to the outside, and

Sealing that separates the exhaust gas passage portion into the opening force by adhering to the surface of the film exterior electrical device on both side edges of the surface of the exhaust gas passage portion that faces the film-covered electrical device. Case for film-covered electrical devices with materials.

[2] The film-covered electrical device case according to claim 1, wherein a sealing material is provided along both side edges of the exhaust gas passage portion also on the outer surface of the exhaust gas passage portion.

[3] The film-covered electrical device case according to claim 1 or 2, wherein a gas discharge port is formed at one end of the exhaust gas passage portion.

[4] The film-covered electrical device case according to any one of claims 1 to 3, wherein the sealing material is a foamable resin.

[5] The film-covered electrical device case according to any one of claims 1 to 3, wherein the sealing material is an ultraviolet curable resin.