JP2012178363A - Housing case and film wrapped electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing case and a film wrapped electric device where a filler is not easily leaked, especially, the filter is not leaked from corners of the case.SOLUTION: A housing case 10 housing a film wrapped electric device 1 has two housing members 10a that are joined to each other. Contact surfaces of the housing members 10a contacting with each other are positioned on a main surface 2a of the film wrapped electric device 1. Engaging parts 11c, 11care formed in one housing member, out of the two housing members 10a, and an engaging hole 12e with which the engaging parts engage is formed in the other housing member, out of the two housing members 10a.

Description

  The present invention relates to a storage case for storing a film-clad electrical device in which an electrical device element is accommodated in a packaging film, represented by a battery or a capacitor, and a film-clad electrical device.

  In general, when a plurality of batteries are connected and used, they are used in a state of being housed in a case for reasons such as battery protection and convenience (see, for example, Patent Document 1).

  By the way, in recent years, the development of electric vehicles and hybrid electric vehicles (hereinafter also simply referred to as “electric vehicles and the like”) equipped with a battery for driving a motor has been rapidly advanced. Naturally, batteries mounted on electric vehicles and the like are also required to be lightweight and thin in order to improve the handling characteristics and travel distance of the electric vehicle. In order to make the battery lighter and thinner, a film-clad battery using a laminate material in which a metal layer such as aluminum and a heat-weldable resin layer are laminated on the outer package via an adhesive layer to form a thin film. Has been developed. 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, and is resistant to acids and alkalis, and is lightweight and flexible.

  A film-clad battery in which a power generation element is covered with a laminate material is lightweight, but has low rigidity and is easily affected by vibration and impact. For this reason, it is necessary to individually store each battery in a case and protect the battery from external impacts and the like. The shape of the film-clad battery is generally a flat plate shape. The case for storing such a flat-shaped film-clad battery has a lid that opens and closes in the normal direction of the main surface of the battery in consideration of convenience when storing or taking out the battery, in other words, Many cases are used that are divided into two from the main surface side of the battery element.

  Although the film-clad battery is protected from external vibrations and shocks when it is housed in the case, if the film-clad battery contained in the case moves within the case, the case wraps the exterior of the film-clad battery. The battery may be damaged due to pain or excessive force applied to the electrodes. Thus, in order to fix the battery in the case, a filler such as a foaming agent may be filled between the case and the battery.

Japanese Utility Model Publication No. 07-019477

  It is extremely difficult to firmly fix the film-clad battery in the case, and when the case is dropped, the four corners of the case are filled with a predetermined amount of filler in order to effectively absorb external shocks. It becomes important. However, in the case of a two-divided case sandwiched from the main surface side of the battery element, the filler may leak from the joint of the case.

  In addition, when the case is configured by a storage unit that stores the film-clad battery and a lid for the storage unit, there is a problem that two types of members, the storage unit and the cover, are required and the number of parts increases. .

  Accordingly, an object of the present invention is to provide a storage case and a film-covered electrical device in which the filler is difficult to leak, and in particular, the filler from the corner of the case does not leak.

  In order to achieve the above object, a storage case of the present invention is a storage case for storing a film-clad electrical device, the storage case having two storage members joined to each other, and a contact surface on which the storage members come into contact with each other Is located on the main surface of the film-clad electrical device, one of the two storage members has an engaging portion, and the other storage member of the two storage members is engaged. An engagement hole for engaging the part is formed.

  According to the present invention, even when the filler is filled in the corners, the filler does not leak to the outside. Therefore, a predetermined amount of filler is filled in the corners, and the film-clad electrical device is securely fixed.

It is an external appearance perspective view of an example of the storage case of the present invention in the state where it was divided and a film exterior battery. It is a top view of an example of the storage case of the present invention in the state where it was divided and a film exterior battery. It is an external appearance perspective view of an example of the storage case of this invention in the state which accommodated the film-clad battery. It is a top view of an example of the storage case of this invention in the state which accommodated the film-clad battery. It is the arrow line view seen from the arrow A direction shown in FIG. It is the arrow line view seen from the arrow B direction shown in FIG. It is a partial enlarged view of an engaging part. It is a partial enlarged view of a corner. It is a permeation | transmission perspective view which shows the state by which the filler was inject | poured into the corner part of the storage case of this invention.

  FIG. 1 is an external perspective view of the storage case in a state of being separated from the film-clad battery of this embodiment, and FIG. 2 is a plan view thereof. 3 is an external perspective view of the storage case in which the film-clad battery of this embodiment is stored, and FIG. 4 is a plan view thereof. 5 shows an arrow view seen from the direction of arrow A shown in FIG. 1, and FIG. 6 shows an arrow view seen from the direction of arrow B shown in FIG. Further, FIG. 7 shows a partially enlarged view of the engaging portion, and FIG. 8 shows a partially enlarged view of the corner portion. 7A shows a state before the storage members are joined, and FIG. 7B shows a state where the storage members are joined together. FIG. 8A is a transmission three-view diagram of the corner, and FIG. 8B is a transmission perspective view of the corner. FIG. 9 is a transparent perspective view showing a state where the filler is injected into the corner of the storage case.

[Film battery]
The film-clad battery 1 of the present embodiment is formed by superposing 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. The film-clad battery 1 has a structure in which the power generation element 2 is sealed with two laminated films 7. That is, in the film-clad battery 1 of the present embodiment, among the four heat-seal portions 7a of the laminate film 7, first, three sides are heat-sealed to form a bag shape, and the remaining one side that is open The power generation element 2 is hermetically sealed by two laminate films 7 by exhausting the air from the inside and evacuating it, and then heat-sealing the remaining one side of the heat-sealing part 7a. It is.

  The power generating element 2 of the film-clad battery 1 may be a laminated type composed of a positive electrode side active electrode and a negative electrode side active electrode laminated via a separator, or a strip-like positive electrode side active electrode and a negative electrode side active electrode. A wound type having a structure in which the positive electrode side active electrodes and the negative electrode side active electrodes are alternately stacked by stacking the electrodes through a separator and then winding the electrodes into a flat shape may be used.

  In addition, as the power generation element 2, any power generation element used for a normal battery is applicable 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 in which a positive electrode active material such as lithium-manganese composite oxide and lithium cobaltate is applied on both sides of an aluminum foil, etc., and carbon that can be doped and dedoped with lithium. A negative electrode plate coated with a material on both sides of a copper foil or the like is opposed to each other with a separator interposed between them and impregnated with an electrolytic solution containing a lithium salt. Other examples of the power generation element 2 include power generation elements of other types of chemical batteries such as nickel metal hydride batteries, nickel cadmium batteries, lithium metal primary batteries or secondary batteries, and lithium polymer batteries. Furthermore, the present invention provides an external device that stores 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 and an electrolytic capacitor. The present invention can also be applied to an electric device sealed with a film.

  A positive electrode terminal 3 and a negative electrode terminal 4 connected to the negative active electrode extend from the heat-sealed portion 7a in the short direction of the film-clad battery 1, respectively. Aluminum is often used for the positive electrode terminal 3, and copper or nickel is often used for the negative electrode terminal 4 due to its electrical characteristics. Hereinafter, the positive electrode terminal 3 and the negative electrode terminal 4 may be collectively referred to as electrodes.

  A part of the heat-sealed portion 7a in the longitudinal direction of the film-clad battery 1 is gas exhausted so that the heat-sealing strength is weaker than that of other portions and the fusion is peeled off at a lower pressure than the other portions. A part 8 is provided.

  If a voltage outside the standard range is applied to the battery during use of 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 or the like. Basically, it is ideal to use the battery within the standard range so that gas is not generated, but the battery control circuit fails for some reason and abnormal voltage is applied, or for some reason If the surroundings become abnormally hot, a large amount of gas may be generated in some cases.

  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 excessively rising and the battery from exploding, many batteries using metal cans as exterior materials have a pressure safety valve that allows gas to escape outside the battery when the internal pressure of the battery increases. . However, it is structurally difficult to provide a pressure safety valve in a film-clad battery using a film as a packaging material. If the internal pressure is too high in a film-clad battery, the film expands and eventually the exterior material ruptures and gas is ejected from that location, but it is not possible to specify where the rupture occurs, so depending on the location where the rupture occurred It may adversely affect surrounding equipment.

  Therefore, in the film-clad battery 1, the gas discharge part 8 as described above is provided in the heat-sealing part 7 a in order to eliminate such problems caused by the generation of gas inside the battery.

  A storage case 10 surrounding the film-clad battery 1 is composed of two storage members 10a. The two storage members 10a have the same shape, and the storage case 10 is configured by reversing the other storage member 10a around the Z axis in FIG.

[Storage material]
The storage member 10 a includes a first side portion 11 and a second side portion 12, an intermediate portion 13 provided in parallel between the first and second side portions 11 and 12, and the first and second portions. Connecting portions 14 and 15 that connect the side portions 11 and 12 and the intermediate portion 13 to each other, thereby forming a substantially frame-shaped storage member 10a. The storage member 10a has a cooling opening 18 formed by the first and second side portions 11 and 12 and the connection portions 14 and 15 for cooling the film-clad battery 1. .

[First side and second side]
The first side portion 11 constitutes the short side portion of the frame-shaped storage member 10 a and the short side portion of the storage member 10.

  On the side surface 11a of the first side portion 11, a notch 11b for extending the electrode to the outside is formed. The notch 11b is open on the side of the opposing surface 11d of the first side portion 11 (the surface facing the storage member 10a used for joining), and is cut out by more than half the width of the electrode.

Engagement portions 11c ₁ and 11c ₂ that engage with engagement holes 12e described later are formed on the facing surface 11d so as to protrude. The engaging portion 11c ₁ and the engaging portion 11c ₂ are formed to face each other with the notch 11b interposed therebetween, and an engaging claw 11e is provided at the tip portion thereof. Each engaging claw 11e is not formed on the facing surface side of the engaging portions 11c ₁ and 11c ₂ , and the facing surface is a smooth surface so as not to inhibit the insertion of the electrodes.

  The second side portion 12 constitutes the short side portion of the frame-shaped storage member 10 a and the short side portion of the storage member 10.

  A cutout 12 b for extending the electrode to the outside is also formed on the side surface 12 a of the second side portion 12. Similarly to the notch 11b, the notch 12b is open on the facing surface 12d side of the second side portion 12, and is notched more than half of the width of the electrode.

  An engagement hole 12e is formed in the main surface 12f of the second side portion 12 so as to catch the engagement claw 11e.

  The corner portion 7b of the heat-sealing portion 7a of the film-clad battery 1 is housed in the corner portion 20 of the housing member 10a, and a filling portion 30 that is a space portion for filling the filler 31 is formed seamlessly and integrally. Has been. The two storage members 10 a of the present embodiment store the battery so as to be sandwiched from both sides in the longitudinal direction of the film-clad battery 1. That is, the dividing line 40 of the storage case 10 is formed so as to pass over the main surface 2a of the film-clad battery 1, and is not formed at the corner 20 of the storage member 10a. In the case of a storage case that is divided in the normal direction of the main surface 2a of the film-clad battery 1, a split line (a mating surface of the storage member) is formed at the corner. In the configuration in which the mating surfaces are formed at the corners, when the filler for fixing the film-clad battery 1 in the storage case 10 is filled in the four corners of the case, the filler leaks from the mating surfaces, and the filler This makes it difficult to securely fix the battery.

  However, as described above, in the storage case 10 of the present embodiment, the dividing line 40, that is, the mating surface of the storage member 10a is not formed in the corner portion 20. For this reason, the film filling battery 1 can be reliably fixed without the filler 31 filled in the filling portion 30 of the corner portion 20 leaking.

  Moreover, since the corner | angular part 20 is integrally formed as shown in FIG. 8, the storage member 10a of this embodiment can obtain high rigidity compared with the structure which has a mating surface in a corner.

  Further, the two storage members 10a constituting the storage case 10 of the present embodiment have the same shape. For this reason, a storage member can be shape | molded with one type | mold, and cost can be reduced.

[Middle part]
The intermediate portion 13 is provided at an intermediate position between the first side portion 11 and the second side portion 12. The intermediate portion 13 is formed with an exhaust gas opening 17 for discharging the gas discharged from the gas discharge portion 8 of the film-clad battery 1 to the outside of the case.

[Connection]
The connection parts 14 and 15 connect the first side part 11 and the intermediate part 13, and connect the intermediate part 13 and the second side part 12.

  The cross-sectional shape of the connecting portion 14 is a U-shape, and constitutes the long side portion of the frame-shaped storage member 10 a and the long side portion of the storage member 10. In the connection part 14, the heat sealing | fusion part 7a of the film-clad battery 1 is accommodated.

  The connecting portion 15 is composed of two parallel flat plates, and forms an opening 16 for storing the film-clad battery 1 in the storage member 10a.

[Storage case]
The storage case 10 is configured by reversing the other storage member 10a around the Z axis in FIG. 1 with respect to one storage member 10a and joining them together.

First, the other storage member 10a reversed around the Z axis in FIG. 1 is opposed to one storage member 10a so that the opposing surfaces 11d face each other. Next, the engaging portions 11c ₁ and 11c ₂ of the one storage member 10a are inserted into the opening 16 of the other storage member 10a and inserted until the engagement claw 11e is caught in the engagement hole 12e. At this time, the engaging portions 11c ₁ and 11c _{2 of the} other storage member 10a are also inserted into the opening 16 of the one storage member 10a, and the other engagement claw 11e is hooked in the one engagement hole 12e.

  As described above, the storage case 10 is configured by attaching the storage members 10a to each other and engaging the engagement claws 11e with the engagement holes 12e. Note that the engagement of the storage members 10a is released by releasing the engagement of the engagement claws 11e with respect to the engagement holes 12e. As described above, the storage case 10 of the present embodiment does not necessarily fix the storage members 10a to each other with an adhesive or the like, so that the engagement between the engagement claw 11e and the engagement hole 12e can be released. The film-clad battery 1 housed in can be taken out.

  In the above-described embodiment, an example is shown in which the battery is stored so that the two storage members 10a are sandwiched from both sides in the longitudinal direction of the film-clad battery 1, but the present invention is not limited to this. That is, the storage case may be divided in any way as long as the filler does not leak by forming the mating surface of the storage member at the corner 20.

  Moreover, since the film-clad battery 1 of this embodiment is provided with the gas discharge part 8, the exhaust part opening part 17 is formed in the intermediate part 13 of the accommodating member 10a. Therefore, when the two storage members 10a have the same shape, the storage member 10a that stores the side where the gas discharge portion 8 of the film-clad battery 1 is not provided is also provided with the exhaust gas opening 17. To do. On the contrary, when the gas discharge part 8 is not provided in the film-clad battery 1, it is not necessary to provide the exhaust gas opening part 17 in any of the storage members 10a.

  In this embodiment, the corner of the storage case of the present invention is integrally formed without a joint. For this reason, even if it is a case where the filler for fixing the corner | angular part of a film-clad electrical device is filled into a corner, a filler does not leak outside. Therefore, a predetermined amount of filler is filled in the corners, and the film-clad electrical device is securely fixed.

  Further, in the storage case of the present embodiment, the storage members are joined so that the contact surface, which is the surface where the storage members contact each other, is positioned on the main surface of the electric device element. Since the abutting surfaces of the storage members are located on the main surface, that is, the mating surface of the storage member is located at a position other than the corner of the storage member, the filler remains from the mating surface even if the corner is filled with the filler. There is no leakage.

  In addition, the storage member of the storage case of the present embodiment has an engagement portion with an engagement claw provided at the tip on the joint surface, which is a surface where the storage members come into contact with each other. An engagement hole for engaging the engagement claw is formed at a position corresponding to the claw. The storage case of the present invention is configured by joining two storage members having the same shape, and by joining the engagement portion provided with the engagement claw and the engagement hole, the two are joined to each other. Therefore, the case can be opened and closed easily.

  Further, the storage case of the present embodiment may have an engaging portion on one end side of the storage member and an engagement hole formed on the other end side. In this case, with respect to one storage member, the other storage member is reversed about the virtual axis between the engagement portion and the engagement hole, and both are joined. That is, both can be easily joined without making a mistake in the joining direction.

  By bringing the joint surface of one storage member and the contact surface of another storage member into contact with each other, the engaging claws of one storage member are engaged with the engagement holes of the other storage member, so that the storage members May be made.

  Further, the storage members of the storage case of the present embodiment may have the same shape. In this case, the types of parts can be reduced.

DESCRIPTION OF SYMBOLS 1 Film exterior battery 2 Electric power generation element 2a Main surface 3 Positive electrode terminal 4 Negative electrode terminal 7 Laminate film 7a Thermal fusion part 8 Gas discharge part 10 Storage case 10a Storage member 11 1st side part 11a Side surface 11b, 12b Cutting Notch portion 11c ₁ , 11c ₂ engaging portion 11d facing surface 11e engaging claw 12 second side portion 12a side surface 12d facing surface 12e engaging hole 12f main surface 13 intermediate portion 14, 15 connecting portion 16 opening 17 exhaust gas opening 18 Cooling opening 20 Corner 30 Filling portion 31 Filler 40 Dividing line

Claims (6)

A storage case for storing a film exterior electrical device,
The storage case has two storage members joined to each other,
The contact surface where the storage members contact each other is located on the main surface of the film-covered electrical device,
One storage member of the two storage members is formed with an engaging portion,
The storage case, wherein the other storage member of the two storage members is formed with an engagement hole with which the engagement portion is engaged.   The said storage member is a storage case of Claim 1 which has an opening part in the surface facing the main surface of the said film-clad electrical device.   The storage case according to claim 1 or 2, wherein the two storage members have the same shape.   The storage case according to any one of claims 1 to 3, wherein the engagement portion and the engagement hole are disposed to face a main surface of the film-covered electrical device.   The storage case according to any one of claims 1 to 4, wherein the engaging portion has an engaging claw that engages with the engaging hole.   A film-clad electrical device comprising: the storage case according to any one of claims 1 to 5; and the film-clad electrical device stored in the storage case.

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