WO2007072660A1

WO2007072660A1 - Film-covered electric device in case

Info

Publication number: WO2007072660A1
Application number: PCT/JP2006/323796
Authority: WO
Inventors: Takaaki Fujitani
Original assignee: Nec Corporation; Fuji Jukogyo Kabushiki Kaisha
Priority date: 2005-12-21
Filing date: 2006-11-29
Publication date: 2007-06-28
Also published as: JP4870092B2; JPWO2007072660A1

Abstract

A power generation element comprises a film-covered electric device enclosed in a packaging bag, a cell case having a first case body and a second case body capable of holding a sealing part formed along the outer peripheral part of the packaging bag, an engagement claw formed on the first case body, and an engagement groove formed in the second case body and in which the engagement claw is inserted. At least a part of the sealing part of the packaging bag is held in a clearance between the engagement groove and the engagement claw inserted into the engagement groove. The clearance is gradually reduced as the engagement claw is inserted into the engagement groove.

Description

Cased film exterior electrical device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a cased film-clad electrical device in which a film-clad electrical device such as a lithium ion secondary battery is accommodated in a case.

Background art

[0002] Conventionally, as a type of thin battery, a film-covered battery in which a power generation element and an electrolytic solution are housed in a packaging bag having a laminated film or the like is known. A conventional film-clad battery will be described with reference to FIG.

A film-clad battery 120 shown in FIG. 7 includes a packaging bag 124 that also has a laminate film force, and a power generation element (not shown) housed in the packaging bag 124. The thickness of the illustrated film-clad battery 120 is several mm to several tens of mm. On the outer peripheral portion of the packaging bag 124, a sealing portion 123 in which laminated films are bonded together is formed. In addition, voltage extraction electrode tabs 125 a and 125 b are drawn out from the sealing portion 123.

[0004] When the film-clad battery 120 is used, a cell case 130 that houses the film-clad battery 120 is often used (see, for example, JP-A-2005-122927). The reason for using the cell case is to improve the convenience of handling the film-clad battery 120 and to prevent the film from being damaged.

[0005] The outer shape of the cell case 130 is not particularly limited. However, the general cell case 130 is also configured with the upper case 134 and the lower case 135 as shown in the figure. Each of the upper case 134 and the lower case 135 has a frame-shaped outer periphery. Disclosure of the Invention The film case battery is held in the cell case 130 by sandwiching the sealing part 123 of the film case battery 120 between the opposing outer peripheral parts of the upper case 134 and the lower case 135

Problems to be solved by the invention

[0006] When using a cell case 130 composed of an upper case 134 and a lower case 135 Therefore, it is necessary to fix the upper case 134 and the lower case 135 to each other. The upper case 134 and the lower case 135 are fixed by a fixing means such as an adhesive or a screw. Further, the upper case 134 and the lower case 135 may be fixed by engaging an engaging claw provided on one of the upper case 134 and the lower case 135 with an engaging groove provided on the other. The fixing structure with the engaging claw and the engaging groove will be described with reference to FIGS. FIG. 8 is a longitudinal sectional view showing the engaging claw and its peripheral structure shown in FIG.

As shown in FIG. 7, two engaging claws 132 are provided on the outer peripheral portion of the upper case 134. As shown in FIG. 8, the engaging claw 132 is inserted into the engaging groove 137 provided in the lower case 135 and engages with the engaging groove 137. The sealing portion 123 of the film-clad battery 120 is sandwiched between the lower surface 133 of the engaging claw 132 and a part of the engaging groove 137 (receiving surface 139).

[0008] In the configuration shown in FIG. 8, even if the engaging claw 132 is moved in the direction indicated by the arrow (insertion direction) and positioned at the final position, the engaging claw 132 and the engaging groove 137 are applied. There is a gap of height (d) between and. Therefore, the sealing portion 123 may not be held between the lower surface 133 of the engaging claw 132 and the receiving surface 139 of the engaging groove 137. In addition, since there is a gap of height (d), the upper case 134 may rattle against the lower case 135.

[0009] The problem to be solved by the present invention has been described above by taking a battery as an example. However, the above problem is a common problem that can occur not only for batteries but also for film-covered electrical devices configured as capacitors or the like.

An object of the present invention is to solve the above problems. Specifically, an object of the present invention is to provide a cased film-covered electrical device provided with a pair of case bodies capable of stably holding the sealing portion of the film-wrapped electrical device without rattling. The

Means for solving the problem

[0011] The cased film-clad electrical device of the present invention is a film-clad electrical device in which a power generation element that stores and outputs electrical energy is enclosed in a packaging bag made of a flexible film. An air device, a cell case having a first case body and a second case body capable of sandwiching a sealing portion formed on an outer peripheral portion of the packaging bag, and an engagement formed on the first case body And an engaging groove formed in the second case body and into which the engaging claw is inserted. At least a part of the sealing portion of the packaging bag is sandwiched between a gap between the engagement groove and the engagement claw inserted into the engagement groove. The gap gradually narrows as the engagement pawl is inserted into the engagement groove.

[0012] According to the present invention, since the gap between the engaging claw and the engaging groove between which the sealing portion of the packaging bag is sandwiched is gradually narrowed, the sealing portion is securely sandwiched. Moreover, even if the thickness of the sealing portion varies, the sealing portion is securely held.

[0013] The engagement claw may be wedge-shaped. In addition, an inclined sliding surface for moving the engaging claw in a direction in which the gap is narrowed is formed in the engaging claw, and another sliding parallel to the sliding surface is formed in the engaging groove. It is preferable to form a moving surface.

[0014] The first case body can be provided with a biasing member that applies a biasing force for inserting the engagement claw into the engagement groove.

[0015] The insertion direction of the engagement claw into the engagement groove is preferably a direction orthogonal to the stacking direction of the first case body and the second case body.

Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a cased film-wrapped electric device according to the first embodiment.

2 is an enlarged perspective view around the engaging portion of the cell case of FIG. 1.

FIG. 3 is an exploded perspective view of the upper case and the lower case.

FIG. 4 is a process diagram showing a process of engaging an engaging claw with an engaging groove.

FIG. 5 is a longitudinal sectional view showing another example of the engaging portion.

FIG. 6 is a partially enlarged view showing the upper case of the second embodiment.

FIG. 7 is an exploded perspective view showing a conventional cell case.

8 is a longitudinal sectional view showing an engagement state between an engagement claw and an engagement groove of the cell case of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] (First embodiment) FIG. 1 is an exploded perspective view showing a cased film-covered electrical device of the present embodiment. FIG. 2 is an enlarged perspective view showing the periphery of the engaging portion of the cell case of FIG. FIG. 3 is a perspective view showing the disassembled upper case and lower case.

The basic structure of the cased film-wrapped electrical device 50 of the present embodiment shown in FIGS. 1 to 3 is the same as the basic structure of a conventional cased film-wrapped electrical device. For example, the electric device 50 includes a film-clad battery 20 that stores and outputs electrical energy via the electrode tabs 25a and 25b, and a cell case 30 that accommodates the film-clad battery 20. Yes. However, the shape force of the engaging claw provided in the cell case 30 is different from the shape of the engaging claw provided in the conventional cell case shown in FIGS. 7 and 8. Is a thin lithium-ion secondary battery that outputs 3.6V. Specifically, it is a battery in which a power generating element 22 (see FIG. 2) and an electrolytic solution are accommodated in a packaging bag 24 that also has a flexible exterior film force. The packaging bag 24 has a structure in which two upper and lower films are bonded together, and a sealing portion 23 in which the films are heat-sealed is formed on the outer periphery of the packaging bag 24 over the entire circumference. The The packaging bag 24 has a rectangular outer shape, and a positive electrode tab 25a and a negative electrode tab 25b are drawn out from two short sides. But a film-clad battery is not limited to the said structure and shape. The film-clad battery includes all common film-clad batteries.

The cell case 30 has an upper case (first case body) 3 4 and a lower case (second case body) 35 formed of a resin material, and a film exterior is formed by the pair of case bodies. The sealing part 23 of the battery 20 is clamped. The outer peripheral portions of the upper case 34 and the lower case 35 of the present embodiment are formed in a frame shape, and this frame-shaped portion sandwiches the entire periphery of the sealing portion 23.

As shown in FIG. 1, the engaging claw 32 is formed on the lower surface side of the upper case 34. Specifically, on each long side portion of the upper case 34, two engagement claws 32 are provided at a predetermined interval in the X direction. In FIG. 1, only the two engaging claws 32 provided on the long side portion on the front side in the Y direction are depicted. Similarly, two engaging claws 32 are formed on the long side portion on the far side. ing. However, the illustrated configuration is merely an example, and the position where the engagement claws 32 are provided in the present invention can be variously changed. The lower case 35 is formed with an engagement groove 37 that can engage with the engagement claw 32. The engagement groove 37 is dug in the Y direction as shown in FIGS. 2 and 3, and the upper surface 38 and the receiving surface 39 of the engagement groove 37 are parallel to each other. However, the shape of the engagement groove 37 is not limited to the illustrated shape.

[0022] As shown in FIGS. 2 and 3, the main characteristic part of the present embodiment is that the cross-sectional shape of the engaging claw 32 is a wedge shape. That is, the engaging claw 32 basically has an L-shaped cross-sectional shape. However, the sliding surface 31 is formed in the portion inserted into the engaging groove 37. The sliding surface 31 is inclined with respect to the horizontal bottom surface (pressing surface 33) of the engaging claw 32. More specifically, the sliding surface 31 is inclined so as to approach the pressing surface 33 toward the distal end side of the engaging claw 32. That is, the portion inserted into the engaging groove 37 of the locking claw 32 has a tapered shape.

FIG. 2 shows a completed state of the cased film-wrapped electrical device 50 of the present embodiment. As shown in the drawing, in the completed state, the engaging claw 32 engages with the engaging groove 37, and the film-clad battery 20 between the pressing surface 33 on the upper case 34 side and the receiving surface 39 on the lower case 35 side. The sealing portion 23 is sandwiched. Further, since the distal end side of the engaging claw 32 enters the engaging groove 37, the upper case 34 and the lower case 35 are not separated in the vertical direction (stacking direction).

[0024] In order to more favorably hold the sealing portion 23, it is preferable that the pressing surface 33 and the receiving surface 39 are parallel to each other.

Next, a method of attaching the upper case 34 having the above configuration to the lower case 35 will be described with reference to FIG. However, here, the process of engaging the engaging claw 32 with the engaging groove 37 will be mainly described.

First, as shown in FIG. 4 (a), the film-clad battery 20 is disposed on the lower case 35. In this state, the sealing portion 23 is positioned on the receiving surface 39 in the engaging groove 37. When the film-clad battery 20 is placed on the lower case 35, the film-clad battery 20 and the case 35 may be fixed (temporarily fixed) using an adhesive. After the film-clad battery 20 is arranged, the engaging claws ₃₂ of the upper case ₃₄ are arranged at the positions shown in FIG. _{4 (a)} . In this state, the engaging claw

32 has not yet been inserted into the engaging groove 37 and is not in contact with other members. Next, as shown in FIG. 4B, the engaging claw 32 is moved toward the engaging groove 37 (in the Y direction in the drawing), and the inclined sliding surface 31 of the engaging claw 32 is engaged. Contact the upper surface 38 (corner) of the groove 37. When the engagement claw 32 is further moved from here, the engagement claw 32 moves downward according to the inclination of the sliding surface 31. As the engaging claw 32 moves downward, the gap between the pressing surface 33 and the receiving surface 39 gradually decreases.

[0028] The engagement claw 32 is finally inserted into the engagement groove 37 to the position shown in FIG. Since the sliding surface 31 of the engaging claw 32 inserted into the engaging groove 37 to the final position is in contact with the upper surface 38, the engaging claw 32 does not rattle in the engaging groove 37. Further, the sealing portion 23 is securely sandwiched between the pressing surface 33 and the receiving surface 39.

[0029] As described above, in the present embodiment, as the engagement claw 32 is inserted into the engagement groove 37, the gap between the engagement claw 32 and the engagement groove 37 (specifically, the pressing surface) The gap between 33 and the receiving surface 39 is gradually reduced. Therefore, the sealing portion 23 is securely sandwiched between the pressing surface 33 and the receiving surface 39. As a result, for example, the problem that the electrolytic solution sealed in the packaging bag 24 leaks from the sealing portion 23 is less likely to occur.

[0030] In addition, since the gap between the pressing surface 33 and the receiving surface 39 is gradually narrowed, the sealing portions 23 having various thicknesses can be securely held. Therefore, even if the thickness of the sealing portion 23 varies, the sealing portion 23 is securely sandwiched between the pressing surface 33 and the receiving surface 39.

[0031] The present invention is not limited to the above embodiment. For example, the configuration shown in FIG. 5 is also included in the present invention. The lower case 35A shown in FIG. 5 is provided with an engagement groove 37 having an upper surface 38A inclined so as to be parallel to the sliding surface 31 of the engagement claw 32. According to such a configuration, when the engaging claw 32 is inserted into the engaging groove 37, the sliding claw 31 and the upper surface 38A slide while contacting each other, so that the engaging claw 32 is improved. Guided.

[0032] (Second Embodiment)

Another embodiment of the cased film-covered electrical device of the present invention is shown in FIGS. 6 (a) and 6 (b). FIG. 6A is an enlarged view of the engaging claw 32 provided in the upper case 34 of the present embodiment and the vicinity thereof. FIG. 6 (b) shows a modification of the engaging claw 32 shown in FIG. 6 (a).

An urging member 40 that urges the engaging claw 32 in a direction to move it into the engaging groove 37 is disposed behind the engaging claw 32 shown in FIG. 6 (a). The urging member 40 shown in the figure is a coil bar. And is disposed between the engaging claw 32 and the rib 36 in a compressed state. The compressed coil panel 40 urges the engaging claw 32 in the arrow Y direction by an elastic restoring force. The biased engagement claw 32 is rotationally displaced in the direction of the arrow about the corner 34a. Based on the above principle, the engaging claw 32 is pushed into the engaging groove 37, and the sealing portion 23 is securely clamped.

The urging member 40 is not limited to a specific member as long as the urging force as described above can be applied to the engaging claws 32. For example, the biasing member 40 may be an elastic body such as rubber or sponge. When the elastic body serving as the urging member 40 is disposed between the inner surface of the cell case 30 and the film-clad battery 20 (preferably disposed in a compressed state), the film in the cell case 30 It is also possible to suppress backlash of the outer battery 20.

The engagement claw 32A shown in FIG. 6 (b) is an independent member of the upper case 34, and is slidable with respect to the upper side member of the upper case 34. The engaging claw 32A urged by the urging member 40 moves in the arrow Y direction and engages in the engaging groove 37.

[0036] The film-clad battery 20 is not limited to the lithium ion secondary battery. The film external battery 20 may be a nickel metal hydride battery, a nickel-powered battery, a lithium metal primary battery, a lithium metal secondary battery, or a lithium polymer battery. Furthermore, the “film-covered electrical device” is not limited to a device that functions as a battery, and may be a device that functions as a capacitor, for example. In other words, the element accommodated in the packaging bag 24 may be an element that functions as a battery or an element that functions as a capacitor. In short, the present invention is effective for all cased film exterior electrical devices having a structure in which the sealing portion of the outer bag film that packages the electrical device is sandwiched between the upper case and the lower case.

In the above embodiment, the engaging claw 32 is provided in the upper case 34, and the engaging groove 37 is formed in the lower case 35. However, for example, the engaging claw 32 can be provided in the lower case 35 and the engaging groove 37 can be formed in the upper case 34. Further, in the above embodiment, the upper case 34 and the lower case 35 have shapes that can surround the upper and lower surfaces of the film-clad battery 20. However, the shape of the upper case 34 and the lower case 35 may be a frame shape. Of course, the configurations described in the above embodiments can be combined as appropriate. In addition, by assembling a plurality of film-clad batteries 20 described in the above embodiment and electrically connecting them in series and Z or in parallel, an assembled battery (for example, used as a power source for driving an electric vehicle) (Electric device assembly) can also be configured

Claims

The scope of the claims

[1] A packaging element in which a power generation element that stores and outputs electrical energy has a flexible film force.

A cell case having a first case body and a second case body capable of sandwiching a sealing portion formed on an outer peripheral portion of the packaging bag;

An engaging claw formed on the first case body;

An engagement groove formed in the second case body and into which the engagement claw is inserted, and a part of the sealing portion in a gap between the engagement claw and the engagement groove The film-covered electric device with a case is characterized in that the gap is gradually narrowed as the engaging claw is inserted into the engaging groove.

[2] The case-encased film-covered electrical device according to [1], wherein the engaging claws are wedge-shaped.

[3] The engaging claw is formed with an inclined sliding surface for moving the engaging claw in a direction in which the gap is narrowed, and the engaging groove has other parallel to the sliding surface. 3. The cased film-clad electrical device according to claim 1 or 2, wherein a sliding surface is formed.

[4] The urging member for applying an urging force for inserting the engaging claw into the engaging groove to the engaging claw is provided on the first case body. The film-covered electrical device containing a case according to any one of claims 1 to 4.

[5] The insertion direction of the engagement claw into the engagement groove is a direction orthogonal to the stacking direction of the first case body and the second case body. 5. The case-wrapped film-clad electrical device according to claim 4, wherein:

[6] It has two or more cased film-clad electrical devices according to any one of claims 1 to 5, and the cased film-clad electrical devices are electrically connected in series and Z or in parallel. A collection of connected electrical devices.