JP2014194883A - Film-armored battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film-armored battery capable of suppressing deformation of a battery armoring body caused by inner pressure, and advantageous for reducing weight.SOLUTION: At laminate films 11, 12 that form a battery armoring body 13, a housing recess 21 of a trapezoidal cross section that houses a power generation element by being dented to an opposite side of the other laminate films 11, 12 is formed, and each rib 41 that stretches over corner parts K1 to K4 of the trapezoidal cross section of the housing recess 21 is formed.

Description

  The present invention relates to a film-clad battery in which a battery-clad body that covers a power generation element is formed by overlapping laminated films.

As a battery such as a lithium ion secondary battery, a film-clad battery in which a battery-clad body that covers a power generation element is formed by laminating a laminate film is known. By using a film-clad battery, it is possible to reduce the thickness and weight.
In this type of film-clad battery, a battery is proposed that has a concave and convex portion extending diagonally on the outermost surface of the battery outer casing, and that this concave and convex portion absorbs distortion generated during the molding process of the battery outer casing. (For example, refer to Patent Document 1).

JP 2010-232076

By the way, especially in the film-clad battery in which weight reduction is requested | required, the internal pressure of the battery exterior body increased at the time of charging / discharging, and there existed a possibility that a battery exterior body might deform | transform by this internal pressure. This deformation becomes a factor that changes the distance between the positive and negative electrode plates in the battery casing, and a desired battery capacity cannot be obtained.
In order to avoid this deformation, a method of increasing the strength by increasing the thickness of the laminate film can be considered. However, this method becomes heavy. As another method, as described in Patent Document 1, a structure in which a rib is provided on the outermost surface of the battery exterior body and the rib is reinforced by this rib can be considered.
However, as a result of investigations by the inventors, the rib is not preferable because the maximum deformation amount with respect to the internal pressure becomes large (see FIGS. 6B and 7 described later).

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a film-clad battery that can suppress deformation of the battery-clad body due to internal pressure and is advantageous for weight reduction.

In order to solve the above-described problems, the present invention provides a battery-clad battery in which a battery-covering body that covers a power generation element is formed by laminating a laminated film, and at least one of the laminated films is on the opposite side of the other laminated film. An accommodation recess for accommodating the power generating element is formed to be recessed, and a rib is formed to straddle the corner of the accommodation recess.
According to this configuration, it is possible to provide a film-clad battery that can suppress deformation of the battery-clad body due to internal pressure and is advantageous for weight reduction.

The said structure WHEREIN: The said rib which straddles one corner | angular part of the said accommodation recessed part, and the said rib which straddles the other corner | angular part are formed discontinuously, It is characterized by the above-mentioned.
According to this configuration, it is possible to suppress bending and deformation at the boundary portion between the rib and the cover, as compared with the case where a continuous rib is provided over the entire cover of the housing recess.

Moreover, the said structure WHEREIN: The front-end | tip which the said rib opposes is formed in a round shape.
According to this configuration, it becomes easy to disperse the deforming force that tends to bend at the boundary between the rib and the cover, and this also makes it difficult to deform the cover.

Further, in the above configuration, the housing recess is recessed in a rectangular box shape toward the opposite side of the other laminate film, and the rib is provided on at least the long side portion facing the housing recess. To do.
According to this configuration, since the span of the long side portion is longer than that of the short side portion, even if the same rib is provided, it is more preferable to provide the rib on the long side portion than to provide the rib on the short side side. The maximum deformation amount with respect to can be efficiently suppressed. In addition, it does not deny providing a rib in the opposing short side part. If ribs are provided on the short side portion, the maximum deformation amount with respect to the internal pressure can be suppressed accordingly.

Moreover, the said structure WHEREIN: The said rib is formed at intervals along the side part of the said accommodating recessed part, It is characterized by the above-mentioned.
According to this configuration, when the ribs of the film-clad battery are stacked facing each other, a gap for interposing air between the film-clad batteries is formed in the region surrounded by the ribs, and air is interposed between the ribs. By circulating, the heat of the film-clad battery can be easily released to the outside, and heat dissipation can be ensured.

Moreover, the said structure WHEREIN: The said rib is arranged at equal intervals wider than the width | variety of this rib, It is characterized by the above-mentioned.
According to this configuration, reinforcement by the ribs can be performed uniformly, and a structure in which the ribs fit together when the film-clad batteries are stacked can be achieved. By using this fitting structure, positioning can be facilitated.

Moreover, the said structure WHEREIN: The said rib is arranged in the zigzag form by the sides which the said accommodating recessed part opposes.
According to this configuration, the ribs can be fitted together when the upper and lower directions of the film-coated batteries are aligned.

Moreover, the said structure WHEREIN: The current collection tab extended from the said electric power generation element is extended outside through the said laminate films from the short side part side which the said accommodating recessed part opposes.
According to this structure, a current collection tab can be arrange | positioned at the short side part side with few deformation | transformation compared with a long side part. Therefore, it is possible to easily press the current collecting tab side.

Moreover, the said structure WHEREIN: The said accommodation recessed part and the said rib are formed toward outward by drawing.
According to this configuration, the rib can be easily provided on the laminate film, and the rib can be formed at the time of drawing the housing recess.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to suppress the deformation | transformation of the battery exterior body by internal pressure, the film exterior battery advantageous to weight reduction can be provided.

It is a perspective view of the film-clad battery which concerns on Example 1 of this invention. It is a top view of the film-clad battery seen from the upper side of FIG. It is the short side view of the film-clad battery seen from the back side where the negative electrode tab of FIG. 1 extends. (A) is a state immediately before the film-clad batteries are vertically aligned and laminated, (B) is a state where the film-clad batteries are vertically aligned, and (C) is the film-clad batteries vertically It is the figure which showed the state just before laminating | stacking without aligning. It is a perspective view of the film-clad battery which concerns on Example 2 of this invention. (A) is a perspective view of the film-clad battery of Comparative Example 1, and (B) is a perspective view of the film-clad battery of Comparative Example 2. It is the figure which showed the simulation result of the maximum deformation amount at the time of the battery internal pressure rise of a film exterior battery.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
<Example 1>
1 is a perspective view of a film-clad battery 10 according to Example 1 of the present invention, FIG. 2 is a top view of the film-clad battery 10 viewed from the upper side of FIG. 1, and FIG. 3 is a negative electrode of FIG. It is the short side view of the film-clad battery seen from the back side where a tab extends. 1 are examples of actual installation states, and the installation direction is not limited to this direction.

  This film-clad battery 10 is configured by housing a power generation element (not shown) in a battery-clad body 13 made of laminate films 11 and 12 to constitute a lithium ion secondary battery. The power generation element has a structure in which a sheet-like positive electrode and a sheet-like negative electrode are stacked with a separator interposed therebetween, and a positive electrode side current collecting tab 15 and a negative electrode side current collecting tab 16 extend from the power generation element, respectively, The body 13 is exposed to the outside. As this power generation element, known power generation elements can be widely applied.

The battery outer package 13 is formed by overlapping two laminate films 11 and 12. In the present embodiment, the laminate films 11 and 12 are preferably made of stainless steel provided with a resin layer, and the strength of the laminate film itself is improved as compared with a conventional laminate film using an aluminum alloy.
Of the two laminated films 11 and 12, at least one laminated film 11 is formed with an accommodation recess 21 that is recessed on the opposite side of the other laminated film 12 to accommodate the power generation element. In this embodiment, as shown in FIG. 3, both laminate films 11 and 12 have a housing recess 21, thereby expanding the layout space of the power generation element and ensuring the battery capacity as much as possible. (A type in which power generation elements are accommodated on both sides).

  In addition, when forming the accommodation recessed part 21 only in one laminate film 11, the other laminate film 12 is made into the planar shape, and the single-sided type (single-sided) which can halve thickness compared with the type which has the accommodation recessed part 21 in both. In which the power generation element is accommodated). In this case, the battery capacity is reduced, but the thickness can be further reduced.

In this embodiment, the same parts are used for the two laminated films 11 and 12. Hereinafter, in order to avoid redundant description, the upper laminate film 11 of FIG. 1 will be described, and the description of the lower laminate film 12 will be omitted.
The upper laminate film 11 is formed by drawing a central portion in advance with respect to the laminate film formed on a rectangular rectangular sheet, so that the housing recess 21 is recessed upward, and a flat rectangular frame remaining around the housing recess 21. The edge portion 31 is integrally formed. In addition, the edge part 31 is an area | region which joins the laminate films 11 and 12 by heat welding.

The housing recess 21 integrally includes a rectangular frame-shaped surrounding wall 22 extending upward from the inner peripheral edge of the edge portion 31 and a rectangular plate-shaped covering portion 23 that blocks between the upper edges of the surrounding wall 22. Yes. Thereby, it is formed in a rectangular box shape in a top view (corresponding to a direction seen from a direction perpendicular to the laminate films 11 and 12).
More specifically, as shown in FIG. 1, the housing recess 21 is formed in a rectangular box shape when viewed from above, and a pair of opposed long side portions 24A and 24B, and the long side portion 24A. , 24B and a pair of opposing short side portions 24C, 24D. And it is comprised from the pair of short side part 24C, 24D side so that the current collection tabs 15 and 16 of an electric power generation element may extend outside between the laminate films 11 and 12. FIG.
In the region corresponding to the short side of the edge portion 31, a concavo-convex portion 32 for passing the current collecting tabs 15, 16 extending from the power generation element housed in the housing recess 21 is formed.

Moreover, in this embodiment, the accommodation recessed part 21 is formed in the cross-sectional trapezoid which becomes so narrow that each vertical cross section along front and back and right and left goes upwards, and each corner located in the both upper sides of right and left and front and back The rounds along the arc are formed in the portions K1, K2, K3, and K4.
In this way, the housing recess 21 can be maintained in the laminate film 11 by performing the molding of the housing recess 21 by drawing. In addition, although the height of the surrounding wall 22, ie, the height of the accommodation recessed part 21, is set to about 5 mm in this embodiment, it can set suitably according to increase / decrease in the number of electrode plates.

Moreover, as shown in FIGS. 1-3, in the accommodation recessed part 21, the corner | angular of the trapezoidal cross section of the accommodation recessed part 21 is set to all the side parts 24A-24D which consist of long side part 24A, 24B and short side part 24C, 24D. Ribs 41 are formed to straddle the portions K1 to K4. A large number of ribs 41 are formed at intervals a (see FIG. 2) along the side portions 24A to 24D. Hereinafter, the rib 41 will be described.
These ribs 41 are ribs that project outward from the surrounding wall 22 and extend linearly up and down. More specifically, the rib 41 extends linearly along the upper surface of the cover 23 across the corners K1 to K4 corresponding to the boundary between the surrounding wall 22 and the cover 23, and is the upper surface of the housing recess 21. It is formed as a convex rib protruding upward from the cover portion 23. Further, the rib 41 is formed at the time of drawing the housing recess 21. In this embodiment, it is formed by a two-stage press, but may be formed simultaneously.

These ribs 41 can function as reinforcing ribs that reinforce the periphery of the corners K1 to K4. That is, since the rib 41 extends over the corner wall K1 to K4 and extends to the surrounding wall 22 and the covering portion 23, the rib 41 is deformed so that the surrounding wall 22 and the covering portion 23 are opened with respect to the corner portions K1 to K4. It is possible to suppress.
The protruding amount of the rib 41 may be set in a range that can be formed by drawing and in a range that suppresses the deformation amount due to the internal pressure of the battery exterior body 13 within an allowable range, and is set to 1 mm in this embodiment. ing.

As shown in FIGS. 1 to 3, the rib 41 straddling one corner K1 of the opposing long side portions 24A and 24B and the rib K2 straddling the other long side portions 24A and 24B are formed discontinuously. And the front-end | tip which each rib 41 opposes is formed in the front-end | tip round shape by the top view.
Similarly, the rib 41 straddling one corner K3 of the opposing short side portions 24C, 24D and the rib 41 straddling the other short side portion 24C, 24D are formed discontinuously. The tip to be formed is formed in a round shape at the top view.
Thus, since the opposing rib 41 is formed discontinuously, it is bent and deformed at the boundary portion between the rib 41 and the cover portion 23 as compared to the case where a continuous rib is provided over the entire cover portion 23. Can be suppressed.
In addition, since the opposite ends of the ribs 41 are round, it is easy to disperse the deformation force that tends to bend at the boundary between the ribs 41 and the cover part 23, and this also deforms the cover part 23. It can be difficult.
In addition, in this embodiment, although the front-end | tip of the rib 41 is formed in round shape, square shape may be sufficient and it does not specifically limit to this shape. However, for the above reasons, a round shape is preferred.

Further, as shown in FIG. 2, the interval a between the adjacent ribs 41 is formed wider than the width b of the rib 41, and each rib 41 is provided in each of the opposing side portions 24 </ b> A to 24 </ b> D. It is arranged in a zigzag pattern so as to fit within 41 rib intervals a.
For this reason, when the film-clad battery 10 is vertically laminated, the ribs 41 formed on the lower surface of the upper film-clad battery 10 are inserted between the ribs 41 formed on the upper surface of the lower film-clad battery 10, and these films The external battery 10 can be fitted.

4 (A), 4 (B), and 4 (C) are diagrams illustrating the case where the film-clad batteries 10 are stacked one above the other. Here, FIG. 4 (A) shows a state immediately before the film-clad battery 10 is vertically aligned, and FIG. 4 (B) shows a state where the film-clad battery 10 is vertically aligned. . FIG. 4C shows a state immediately before the film-clad battery 10 is stacked without being aligned vertically.
As shown in FIG. 4 (A), when the film-clad battery 10 is stacked vertically, that is, when the lower surface of the upper film-clad battery 10 and the upper surface of the lower film-clad battery 10 are stacked. The ribs 41 formed on the lower surface of the upper film-clad battery 10 and the ribs 41 formed on the upper surface of the lower film-clad battery 10 are alternately arranged. As a result, as shown in FIG. 4B, when the film-covered battery 10 is stacked up and down, the ribs 41 of one film-covered battery 10 enter between the ribs 41 of the other film-covered battery 10 and fit together. it can.
By setting it as the structure which fits in this way, when the film-clad batteries 10 are piled up, the film-clad batteries 10 can be positioned mutually.

On the other hand, as shown in FIG. 4C, when the film-clad battery 10 is laminated without being aligned vertically, that is, the lower surface of the upper film-clad battery 10 and the lower surface of the lower film-clad battery 10 are laminated. In such a case, the rib 41 on the lower surface of the upper film-covered battery 10 faces the rib 41 on the upper surface of the lower film-covered battery 10 and cannot be fitted.
Although not shown in the drawing, this makes it possible to fit the film-clad battery 10 in a state where the film-clad battery 10 is aligned vertically.
By adopting a structure that does not fit in this way, a gap for interposing air between the film-clad batteries 10 is formed in the region surrounded by the ribs 41. When air flows between the ribs 41, the heat of the film-clad battery 10 can be easily released to the outside, and heat dissipation can be ensured.

  Next, in order to evaluate the film-clad battery 10 of Example 1, the inventors obtained the maximum deformation amount of the laminate films 11 and 12 when the battery internal pressure increased by simulation analysis.

<Example 2>
FIG. 5 is a perspective view of the film-clad battery 10 according to the second embodiment of the present invention.
In the film-clad battery 10 according to the second embodiment, the ribs 41 are formed only on the long side portions 24A and 24B of the housing recess 21 that face each other. Further, the ribs 41 of the opposing long side portions 24A and 24B are not arranged in a staggered manner but are arranged in the same straight line.
In other words, in the second embodiment, the long sides 24A and 24B, which are expected to be easily deformed, of the long sides 24A and 24B and the short sides 24C and 24D are reinforced by the ribs 41, and the ribs 41 than the first embodiment. It is the structure which reduced. Other configurations are the same as those in the first embodiment.
For the film-clad battery 10 of Example 2, similarly to Example 1, the maximum deformation amount of the laminate films 11 and 12 when the battery internal pressure increased was obtained by simulation analysis.

<Comparative Example 1>
6A is a perspective view of the film-clad battery 101 of Comparative Example 1. FIG.
The film-clad battery 101 of Comparative Example 1 was configured not to include the ribs 41, and the other configuration was the same as that of Example 1 or 2. Also for Comparative Example 1, the maximum deformation amount of the laminate films 11 and 12 when the battery internal pressure was increased was obtained by simulation analysis.

<Comparative example 2>
FIG. 6B is a perspective view of the film-clad battery 102 of Comparative Example 2.
The film-clad battery 102 of Comparative Example 2 has a configuration in which ribs 141 extending diagonally are provided on the upper surface of the housing recess 21, and the other configuration is the same as that of Comparative Example 1 above. Also in Comparative Example 2, the maximum deformation amount of the laminate films 11 and 12 when the battery internal pressure was increased was obtained by simulation analysis.

FIG. 7 shows the simulation results of Examples 1 and 2 and Comparative Examples 1 and 2.
As is clear from the results shown in FIG. 7, the maximum deformation amount of Example 1 was the smallest, and then the maximum deformation amount of Example 2 was the smallest. Moreover, the maximum deformation amount of each of Comparative Examples 1 and 2 was larger than that of Examples 1 and 2.
From the results shown in FIG. 7, it was found that the maximum deformation amount was larger in Comparative Example 2 in which the rib 141 was provided than in Comparative Example 1 in which no rib was provided. From this, it was confirmed that the rib 141 of Comparative Example 2 is unsuitable for suppressing the maximum deformation amount with respect to the internal pressure. Thus, Examples 1 and 2 were clearly advantageous in comparison with Comparative Examples 1 and 2 in that the maximum deformation amount related to the internal pressure was suppressed.
In addition, although the maximum deformation amount of the comparative example or the example is a simulation result, when the value of the comparative example 1 and the example 1 was actually measured for verification, the same tendency as the simulation result was shown.

  In addition, the inventors have similarly verified the structure in which the rib 41 is formed only on the opposing short side portions 24C and 24D of the housing recess 21, and confirmed that the maximum deformation amount with respect to the internal pressure is larger than that in the second embodiment. doing. However, the maximum change amount was smaller than those of Comparative Examples 1 and 2. The reason is that the long sides 24A and 24B have a longer span than the short sides 24C and 24D. Therefore, even if the same rib 41 is provided, it is possible to provide the rib 41 on the long sides 24A and 24B side. This is considered to be effective from the viewpoint of suppressing the maximum deformation amount.

  Further, the inventors similarly verified the structure in which the rib 41 formed on the long side portion 24A and the rib 41 formed on the long side portion 24B are connected, that is, continuously formed in Example 2. However, the maximum deformation amount with respect to the internal pressure was larger than that in Example 2. However, similarly to the above, the effect of suppressing the maximum deformation amount was seen from Comparative Examples 1 and 2.

As described above, in the present configuration shown in Examples 1 and 2, in the battery case 10 in which the battery case 13 is formed by superimposing the laminate films 11 and 12, as shown in FIG. One of the films 11 and 12 is formed with an accommodation recess 21 that is recessed on the opposite side of the other laminate film 11 and 12 and accommodates the power generation element, and a rib 41 that straddles the corners K1 to K4 of the accommodation recess 21. Therefore, it is possible to suppress the maximum deformation amount of the battery exterior body 13 due to the internal pressure.
Moreover, according to this structure, a deformation | transformation can be suppressed even if it does not take the method of thickening the laminate films 11 and 12 and raising intensity | strength. Moreover, since the rib 41 can be easily formed by drawing the laminated films 11 and 12, it is possible to avoid the film-clad battery 10 from becoming heavy.
Accordingly, in this configuration, it is possible to provide a film-clad battery 10 that is advantageous for weight reduction while suppressing deformation of the battery-clad body 13 due to internal pressure.

Further, as shown in FIG. 1 and the like, the rib 41 straddling one corner K1 to K4 of the housing recess 21 and the rib 41 straddling the other corner K1 to K4 are formed discontinuously. Compared with the case where the rib 41 continuous over the entire cover portion 23 of the recess 21 is provided, it is possible to suppress the bending and deformation at the boundary portion between the rib 41 and the cover portion 23.
Moreover, since the opposing tip of each rib 41 is formed in a round shape, it becomes easy to disperse the deformation force that tends to bend at the boundary between the rib 41 and the cover part 23, and this also makes the cover part 23 It can be made difficult to deform.

Further, when the rib 41 is provided at least on the long side portions 24A and 24B facing each other, the maximum deformation amount with respect to the internal pressure is more efficiently than when the rib 41 is provided only on the short side portions 24C and 24D. Can be suppressed.
Moreover, when the rib 41 is formed at intervals along the side portions 24 </ b> A to 24 </ b> DB of the housing recess 21, the rib 41 can be reinforced throughout the housing recess 21, and local deformation due to internal pressure is suppressed. Can do.

  In the present embodiment, the ribs 41 are formed at intervals along the long side portions 24A and 24B. However, the ribs 41 are formed at intervals along the long side portions 24A and 24B, for example. Although it is possible to form convex portions that are continuous in the width of the length, it is preferable to leave a gap because the strength is higher.

Further, when the ribs 41 are arranged at equal intervals wider than the width b of the ribs 41, the ribs 41 can be evenly reinforced, and the ribs 41 can be arranged together when the film-clad battery 10 is stacked. The structure can be fitted. By using this fitting structure, positioning becomes easy.
In the present embodiment, the ribs 41 are arranged at equal intervals. However, if the ribs 41 are not at equal intervals, the ribs 41 are not fitted to each other when the film-clad battery 10 is stacked. However, when the film-clad batteries are laminated, it is possible to normally secure a ventilation gap between the film-clad batteries 10. However, the present embodiment is more preferable because it has both the effect of facilitating positioning by the way of stacking and the effect of ensuring a gap for ventilation.

  Further, as in Example 1, when the ribs 41 are arranged in a staggered manner between the opposing sides 24A to 24D of the housing recess 21, when the up and down directions of each film-covered battery 10 are aligned, The ribs 41 can be fitted together. On the other hand, when the ribs 41 are arranged symmetrically between the opposing sides 24A to 24D of the housing recess 21 as in the second embodiment, the ribs can be obtained without aligning the upper and lower directions of the respective film-clad batteries 10. 41 can be fitted together. In short, the arrangement of the ribs 41 and the like can be set as appropriate within a range in which the maximum deformation amount of the battery exterior body 13 due to the internal pressure is kept within an allowable range.

Further, in this configuration, the current collecting tabs 15 and 16 extending from the power generation element extend to the outside through the laminate films 11 and 12 from the opposing short side portions 24C and 24D side of the housing recess 21, so that the long sides The current collecting tabs 15 and 16 can be arranged on the short side portions 24C and 24D side with less deformation than the portions 24A and 24B. Therefore, it becomes easy to hold down the current collecting tabs 15 and 16 side.
In the present embodiment, the current collecting tabs 15 and 16 are arranged on the short side portions 24C and 24D side, but the present invention is not limited to this, and the current collecting tabs 15 and 16 are arranged on the long side portions 24A and 24B side. Although there is no problem even if it is the structure to perform, the structure which arrange | positions a current collection tab on the short side part side for the said reason is more preferable. Moreover, even if the current collection tabs 15 and 16 do not extend from the opposing side part, it is also possible to extend both the current collection tabs from any one side.

  Further, the housing recess 21 and the rib 41 of this configuration are formed outward by drawing. For this reason, the ribs 41 can be easily provided on the laminate films 11 and 12, and the ribs 41 can be formed at the time of drawing the housing recess 21.

In this configuration, the maximum deformation amount with respect to the internal pressure can be adjusted by adjusting the number of ribs 41 and the width b. For example, when it is desired to increase the strength, the rib 41 may be increased. When the strength may be decreased, the rib 41 may be reduced or the width b of the rib 41 may be increased. That is, the rib 41 can be easily adjusted so that the required strength can be obtained, and the degree of freedom of adjustment is high.
Furthermore, in this configuration, since the laminate films 11 and 12 are made of stainless steel, the strength of the battery outer package 13 can be improved as compared with the case where an aluminum alloy is used.

The above-described embodiments are merely examples of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the housing recess 21 has a rectangular box shape has been described. However, the present invention is not limited thereto, and a rectangular box shape such as a square can be widely applied.
The laminate films 11 and 12 may also be made of a material other than stainless steel, such as an aluminum alloy, by changing the thickness within a range in which the battery exterior body 13 can obtain the required strength.
Moreover, when the accommodation recessed part 21 and the rib 41 can be shape | molded other than a drawing process, you may employ | adopt other than a drawing process.
Furthermore, although the case where this invention is applied to a lithium ion secondary battery was demonstrated, you may apply this invention to another secondary battery and a primary battery.

10, 101, 102 Film-clad battery 11, 12 Laminate film 13 Battery-clad body 21 Housing recess 24A, 24B Long side part 24C, 24D Short side part 41, 141 Rib a Spacing of rib 41 b Rib 41 width K1-K4 angle Part

Claims (9)

In a film-clad battery formed by overlaying a laminate film on a battery-clad body covering a power generation element,
At least one of the laminate films is formed with an accommodation recess that is recessed on the opposite side of the other laminate film and accommodates the power generation element, and a rib is formed across a corner of the accommodation recess. Film-clad battery.   2. The film-clad battery according to claim 1, wherein the rib straddling one corner of the housing recess and the rib straddling the other corner are formed discontinuously.   The film-clad battery according to claim 1, wherein the opposing ends of the ribs are formed in a round shape.   The said accommodation recessed part is dented in a rectangular box shape toward the opposite side of said other laminate film, and the said rib is provided in the at least long side part which the said accommodation recessed part opposes. The film-clad battery as described in any one of these.   5. The film-clad battery according to claim 4, wherein the ribs are formed at intervals along a side portion of the housing recess.   6. The film-clad battery according to claim 5, wherein the ribs are arranged at equal intervals wider than the width of the ribs.   7. The film-clad battery according to claim 5, wherein the ribs are arranged in a staggered manner on opposite sides of the housing recess.   8. The current collecting tab extending from the power generation element extends to the outside through the laminate film from the opposing short side portion side of the housing recess. Film outer battery.   The film-clad battery according to any one of claims 2 to 8, wherein the housing recess and the rib are formed outward by drawing.

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