JP6136466B2 - Power storage element and method for coating power storage element - Google Patents

Description

  The present invention relates to a storage element such as a secondary battery and other batteries, and a method for coating the storage element.

  Secondary batteries are widely used as power sources for electronic devices such as mobile phones and IT devices, as well as for replacing primary batteries. In particular, since non-aqueous electrolyte secondary batteries represented by lithium ion batteries have high energy density, they are also being applied to industrial large electric devices such as electric vehicles.

  A nonaqueous electrolyte secondary battery generally includes a metal exterior as a storage container, and the storage container is often set to the same potential as either positive or negative electrode. Therefore, for easy handling or in order to prevent a short circuit due to mutual contact when arranging a plurality of batteries into a module, it has been widely performed to cover the storage container with an insulating film ( For example, see Patent Document 1 and FIG.

JP 2011-175842 A

  However, the conventional nonaqueous electrolyte secondary battery as described above has the following problems. That is, the insulating film is often used as a cylindrical heat-shrinkable tube as exemplified in the above-mentioned patent document, and after covering the battery storage container, the coating is completed by heating and shrinking. It is difficult to obtain a finish that accurately corresponds to the shape of the metal container, which may cause wrinkles and protrusions.

  If there is a flaw in the insulating film, a liquid junction may occur when moisture enters the insulating film. In addition, the protrusion of the insulating film from the storage container not only impairs the aesthetics of the battery, but particularly the protrusion to the bottom side hinders stable placement of the battery and impairs resistance to vibration and impact. It will be.

  As described above, in a power storage element such as a conventional non-aqueous electrolyte secondary battery, it is required to perform insulating coating with high accuracy corresponding to the shape of the storage container in order to improve the reliability of the element. It was.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power storage element that is accurately coated along the outer shape of the storage container and a method for coating the power storage element.

In order to achieve the above object, the first aspect of the present invention provides:
An electrode body;
A storage container for storing the electrode body;
A covering that covers at least a side surface of the storage container;
The covering is formed of a plurality of insulating films.
It is a power storage element.

The second aspect of the present invention is
The storage container has a plurality of pairs of opposing side surfaces,
All or some of the plurality of sets of side surfaces have different widths from each other,
In the covering, the ends of the insulating film are positioned on the side surface of the set having the largest width among the plurality of sets of side surfaces,
It is an electrical storage element of the 1st side surface of this invention.

The third aspect of the present invention is
The covering body covers the side surfaces by overlapping the end portions of the insulating film at one position for each side surface of the widest set of the plurality of side surfaces.
It is an electrical storage element of the 2nd side surface of this invention.

The fourth aspect of the present invention is
The covering body covers the side surfaces by overlapping the end portions of the insulating film at a plurality of positions for each side surface of the widest set of the plurality of side surfaces. ,
It is an electrical storage element of the 2nd side surface of this invention.

The fifth aspect of the present invention is
The overlapping positions on the side surfaces of the set having the largest width of the side surfaces of the plurality of sets of end portions of the insulating film are as follows:
As viewed from the side surface, all of the overlapping portions of the insulating film are positions that do not face each other.
It is an electrical storage element of the 3rd or 4th side surface of this invention.

The sixth aspect of the present invention is
The order of overlap of the end portions of each of the plurality of insulating films is changed for each side surface.
It is an electrical storage element of the 3rd to 5th side surface of this invention.

The seventh aspect of the present invention is
The storage container has a plurality of pairs of opposing side surfaces,
The covering body covers the side surface by the insulating film being disposed only on each of the plurality of sets of side surfaces.
It is an electrical storage element of the 1st side surface of this invention.

The eighth aspect of the present invention is
All or part of the insulating film is different from each other in at least one of material, surface color or pattern, or thickness,
It is an electrical storage element of the 7th side surface of this invention.

The ninth aspect of the present invention is
A power supply module comprising at least one power storage element according to any one of the first to eighth aspects of the present invention.

The tenth aspect of the present invention provides
A method of covering an electricity storage device that covers an electricity storage device having an electrode body and a storage container for housing the electrode body,
A coating step of coating a plurality of insulating films on at least a side surface of the storage container;
The storage container has a plurality of pairs of the side surfaces facing each other,
All or some of the plurality of sets of side surfaces have different widths from each other,
The covering step includes a step of overlapping the end portions of the insulating film on the side surface of the set having the largest width among the plurality of sets of side surfaces of the storage container.
This is a method for coating a storage element.

  The present invention as described above has an effect that an accurate covering can be obtained along the outer shape of the storage container in the electric storage element.

The perspective view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention. (A) Front view showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention (b) Rear view showing the configuration of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention (A) Side view showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention (b) Schematic cross-sectional view taken along line AA in FIG. 3 (a) 1 is a schematic exploded perspective view showing a configuration of a coating film of a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention. Schematic plan view showing the configuration of the power supply module according to Embodiment 1 of the present invention. (A) Perspective view showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention (b) Perspective view showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention Schematic sectional view of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention. (A) Perspective view showing a configuration of a nonaqueous electrolyte secondary battery according to Embodiment 3 of the present invention (b) Perspective view showing a configuration of a nonaqueous electrolyte secondary battery according to Embodiment 3 of the present invention (A) The perspective view which shows the other structural example of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention (b) The other structural example of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention A perspective view showing (A) The figure for demonstrating the other example of the coating state of the coating film which concerns on embodiment of this invention (b) In order to demonstrate the other example of the coating state of the coating film which concerns on embodiment of this invention Figure of (A) The figure for demonstrating the other example of the coating state of the coating film which concerns on embodiment of this invention (b) In order to demonstrate the other example of the coating state of the coating film which concerns on embodiment of this invention Figure of

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

(Embodiment 1)
(1. Non-aqueous electrolyte secondary battery)
1 is a perspective view showing a schematic configuration of a non-aqueous electrolyte secondary battery 1 according to an embodiment of the present invention, FIG. 2 (a) is a front view thereof, FIG. 2 (b) is a rear view thereof, FIG. 3 (a) is a side view of the same, and FIG. 3 (b) is a schematic cross-sectional view taken along line AA of FIG. 3 (a).

  As shown in each figure of FIGS. 1-3, the non-aqueous electrolyte secondary battery 1 is made of the same material as the container main body, which seals the opening body of the open box container 10 made of aluminum and the container main body 10. An outer quadrangular prism shaped storage container composed of a plate-like lid 20 is provided as an exterior.

  The container body 10 contains an electrode body and an electrolytic solution (not shown) having a configuration in which a positive electrode and a negative electrode, which are band-shaped electrodes, are wound in a long cylindrical shape through a separator (not shown). Positive and negative electrode metal foils are exposed at both ends, and are located on a pair of short side surfaces (hereinafter referred to as short side surfaces) 10b of the container body 10, respectively. Both electrodes of the electrode body are electrically connected to a pair of electrode terminals 31 provided on the lid portion 20, whereby electric power is taken out of the storage container.

  The conductive path connecting the electrode terminal 31 and the electrode body is insulated from the storage container by a synthetic resin packing 32 which is an insulator. The packing 32 also serves to seal the space and gap between the conductive path and the storage container in order to prevent leakage of the electrolyte from the storage container.

  The lid 20 is provided with a safety valve 21 that is opened when the internal pressure of the non-aqueous electrolyte secondary battery 1 exceeds a predetermined value. Further, an injection port for injecting an electrolytic solution is provided after the lid 20 and the container body 10 are sealed by laser welding or the like, and the injection port is sealed by a sealing plug 22 after injecting the electrolytic solution. Yes.

  Further, a covering body 11 is provided around the container body 10. The covering body 11 is formed by attaching an insulating covering film to be described later, and as shown in FIGS. Hereinafter, the long side coating 11a is located on the short side 10b, and the short side coating 11b is located on the short side 10b of the container body 10.

  Further, as shown in the cross-sectional view of the main part of FIG. 3B, the covering body 11 is integrated by overlapping both ends of the two covering bodies on each of the long side surfaces 10a of the container body 10 containing the electrode body 10x. The entire circumference of the container body 10 is covered. Here, the long side surface covering 11a includes a long side surface covering 11a1 having a long overall length composed of one covering body, and a long side surface covering 11a2 composed of the other covering body and having a shorter overall length than the long side surface covering 11a1. And a laminated surface covering 11c formed by overlapping both ends of the covering body. In the figure, the thickness of the covering 11 is exaggerated for the sake of explanation.

  Further, as shown in FIG. 1, the position of the laminated surface coating 11c on the long side surface 10a is shifted from the center of the long side surface 10a, and as shown in FIGS. 2 (a) and 2 (b), the front side And the same position as seen from the back side. That is, in the laminated surface coating 11 c, the pair of laminated surface coatings 11 c are arranged symmetrically with respect to the center of the lid portion 20 and asymmetric with respect to a straight line parallel to the longitudinal side of the lid portion 20. In other words, when viewed from one long side surface 10a, the pair of laminated surface coatings 11c are arranged at positions that do not face each other and do not overlap each other.

  The nonaqueous electrolyte secondary battery 1 of the present embodiment having the above-described configuration is characterized in that it includes a covering body 11 that covers the shape of the container body 10 with high accuracy.

  The container body 10 is obtained by drawing a metal plate made of aluminum as a raw material and forming it into an open box shape. At this time, due to the accuracy of the mold, the pressing pressure, the hardness of the raw material, the thickness, etc. The boundary between the long side surface 10a and the short side surface 10b is formed as a curved surface instead of a strict angle.

  Therefore, in order to accurately form the covering body 11 corresponding to the curved shape of the side surface of the container body 10, the covering body 11 of the present embodiment includes two covering films 40x and 40y shown in the exploded perspective view of FIG. The boundary between the long side surface 10a and the short side surface 10b is routed while maintaining a constant tension, and both ends of each film are overlapped on the long side surface 10a having the largest surface area on the container body 10. Thus, the laminated surface coating 11c is formed.

  In said structure, the nonaqueous electrolyte secondary battery 1 corresponds to the electrical storage element of this invention, and the combination of the container main body 10 and the cover part 20 is equivalent to the storage container of this invention. The electrode body 10x corresponds to the electrode body of the present invention, the covering body 11 corresponds to the covering body of the present invention, and the insulating covering films 40x and 40y correspond to the insulating film of the present invention.

Hereinafter, the construction of the covering films 40x and 40y and the work process for completing the covering body 11 using the covering films 40x and 40y corresponding to the covering process of the method for manufacturing the electricity storage device of the present invention will be described. The first embodiment will be described in more detail.
(2. Coated film and coating method)

  FIG. 4 is a schematic perspective view showing the configuration of the coating film 40 according to the first embodiment of the present invention and the state of coating on the container body 10. The covering film 40 is formed of a 40-50 μm-thick flat sheet-like film body made of insulating polyethylene, polycarbonate, or other synthetic resin, in accordance with the outer shape of the storage container of the nonaqueous electrolyte secondary battery 1. It is obtained by processing.

  Specifically, the covering film 40x is a rectangular member, and covers the front side of the pair of long side surfaces 10a of the container body 10 of the nonaqueous electrolyte secondary battery 1 and the back side. Region 40x2 and a region 40x3 covering one side of the pair of short side surfaces 10b, the region 40x1 corresponds to the long side surface coating 11a1, the region 40x2 corresponds to the long side surface coating 11a2, and the region 40x3 corresponds to the short side surface This corresponds to the coating 11b.

  Further, the covering film 40y has the same shape as the covering film 40x, and the region 40y1 covering the back side of the pair of long side surfaces 10a together with the region 40x2 of the covering film 40, and the front side of the pair of long side surfaces 10a. The coating film 40 is divided into a region 40y2 that covers the region 40x1 and a region 40y3 that covers the other side of the pair of short side surfaces 10b, the region 40y1 corresponds to the long side surface coating 11a1, and the region 40y2 corresponds to the long side surface coating 11a2. The region 40y3 corresponds to the short side surface coating 11b.

  In each of the covering films 40x and 40y, the region 40x1 is larger in the region 40x1 (40y1) and the region 40x2 (40y2) than the region 40x2. In the relationship with the covering films 40x and 40y, the region 40x1 and the region 40y1 have the same length, and the region 40x2 and the region 40y2 have the same length.

  Further, the entire surfaces of the covering films 40x and 40y facing the respective surfaces of the container body 10 form an adhesive surface to which an adhesive is applied.

  Bonding of the coating films 40x and 40y having the above configuration to the non-aqueous electrolyte secondary battery 1 is performed as follows. That is, with respect to the pair of long side surfaces 10a of the container body 10, the end portion 40x2e of the covering film 40x and the end portion 40y2e of the covering film 40y are pasted first. Next, each film is drawn around the short side surface 10b with a certain tension, and the covering film 40y is bonded so that the end portion 40y1e covers the end portion 40x2e. At the same time, the covering film 40x is bonded to the end portion 40y2e so as to cover the end portion 40x1e. Note that the end portions 40x1e, 40x2e, 40y1e, and 40y2e correspond to the end portions of the present invention.

  Thereby, like the covering 11 after completion shown in FIG.3 (b), the lamination | stacking surface coating | cover 11c will differ in the order of superimposition of the covering films 40x and 40y by the front side and the back side, and a covering body. 11 shapes can be kept symmetrical.

  Moreover, the adhesive films 40x and 40y can be bonded to the container body 10 without causing a positional shift by adhering via the adhesive surface.

  From the above, the covering body 11 is completed by finishing the shape along the surface of the container body 10 as shown in FIGS.

  As described above, the nonaqueous electrolyte secondary battery 1 according to the first embodiment uses the pair of coating films 40x and 40y to overlap each other on the front and back long side surfaces 10a. The following effects are achieved by providing That is, each of the two films is drawn on the short side surface 10b from one of the long side surfaces 10a having the largest surface area in the storage container 10 to the other long side surface 10a. The boundary of the side surface 10b can be covered with a film in a state where a certain tension is applied, and the shape of the container body 10 can be satisfactorily followed.

  Thereby, the surface of the container body 10 can be coated without wrinkles or protrusions. The non-aqueous electrolyte secondary battery 1 that is resistant to moisture ingress and vibration and has improved reliability can be obtained by the accurate covering 11 corresponding to the shape of the storage container. Moreover, the surface of the covering 11 can be finished beautifully, and the effect of reducing the dimensional error of the outer shape of the nonaqueous electrolyte secondary battery 1 is also achieved.

  In addition, the covering films 40x and 40y are good also as a raw material which has a stretching property. In this case, even when the nonaqueous electrolyte secondary battery 1 expands or deforms due to a change in internal pressure or the like, the covering 11 follows the change in the shape of the container body, and may be peeled off or damaged from the container body. Can be suppressed.

  Further, the overlapping positions of the end portions 40x1e and 40y2e and the end portions 40x2e and 40y1e of the respective coating films 40x and 40y are also set on the long side surface 10a, thereby facilitating positioning from other places on the storage container 10. be able to.

  As described above, the covering body 11 according to the first embodiment can obtain an accurate covering along the outer shape of the storage container.

  Furthermore, in this Embodiment 1, the position of a pair of laminated surface coating | cover 11c is shifted from the center in the long side surface 10a of a front and a back, and it was set as the position from which all did not mutually oppose. The effect of. That is, when the covering film is overlapped on the long side surface 10a, the thickness of the laminated surface covering 11b1 shown in FIG. 4B is transferred to the thickness of the nonaqueous electrolyte secondary battery 1. When the power module using the nonaqueous electrolyte secondary battery 1 as a unit cell is configured and the long side surfaces 10a are arranged to face each other, the thickness is overlapped in the stacking direction of the unit cell, and the large size of the module It becomes the cause.

  Therefore, by adopting the configuration of the first embodiment, the power module 50 configured by arranging the non-aqueous electrolyte secondary battery 100 shown in FIG. 5 as single cells Ca to Cd and arranging the long side surfaces 10a adjacent to each other. As described above, in the unit cells facing each other, the positions of the laminated surface coatings 11c are different from each other, and the influence of the thickness can be reduced.

  In addition, the unit cells Ca and Cb facing each other are in contact with each other through a common laminate surface coating 11c, such as the laminate surface coatings 11c (a) and 11c (b) located between the cells. A clearance g is formed between them. Between the single cells Cb and Cc and between the single cells Cc and Cd, the laminated surface coatings 11c (b) and 11c (c), the laminated surface coatings 11c (c) and 11c (d) are shared, and a similar clearance g is provided. It is formed.

  Thereby, it becomes possible to reduce the influence of the heat generation of the cells in the power supply module.

Thus, according to the nonaqueous electrolyte secondary battery 1 of the present embodiment, by providing the covering body 11 using the covering films 40x and 40y, an accurate covering along the outer shape of the storage container is obtained. be able to.
(Embodiment 2)

  6 (a) is a perspective view including a front long side surface 10a showing a schematic configuration of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention, and FIG. It is a perspective view containing the long side surface 10a. However, including the following embodiments, the same or corresponding components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The nonaqueous electrolyte secondary battery 2 according to the second embodiment includes a covering body 12 composed of four insulating coating films. A description will be given below.

  As shown in FIGS. 6 (a) and 6 (b), the long side surface 10a of the storage container 10 of the nonaqueous electrolyte secondary battery 2 includes a long side surface covering 12a located at the center of the long side surface 10a, and a long side surface covering 12a. It is covered with a pair of laminated surface coatings 12c adjacent to both ends and positioned on both sides near the short side surface 10b. The short side surface 10b is covered with a short side surface coating 12b similar to the short side surface coating 11b of the first embodiment.

  Further, as shown in the cross-sectional view of the main part of FIG. 7, the covering body 12 has a container body integrally formed by overlapping both ends of the four covering bodies on each of the long side surfaces 10a of the container body 10 containing the electrode body 10x. The entire circumference of 10 is covered.

  Next, with reference to FIG. 7, the coating film used as the basis of each coating body which comprises the coating body 12 is demonstrated.

  The long side surface covering 12a is constituted by a covering film 60x having substantially the same shape as the front and back long side surfaces 10a. At the time of producing the covering 12, the covering film 60x is attached to the entire surface of the long side surface 10a so that the end 60xe is first aligned with the boundary between the long side surface 10a and the short side surface 10b. This operation is performed on both the front and back sides.

  The short side surface coating 12b and the laminated surface coating 12c are configured by a single coating film 60y. In the coating film 60y, a region 60y1 that covers the entire short side surface 10b and a length of the front and back surfaces are continuous from the region 60y1. Each region is divided into a region 60y2 that wraps around the side surface 10a and covers a part thereof.

  At the time of making the covering 12, after pasting one end 60y2e of the covering film 60y on the already pasted one covering film 60x, and then drawing around the short side surface 10b with a certain tension, The covering films 60x and 60y are completely bonded together so that the other end 60y2e is placed on the other covering film 60x. The end portions 60xe and 60y2e correspond to the end portions of the present invention.

  By providing such a covering 12, in the second embodiment, as in the first embodiment, the boundary between the long side surface 10a and the short side surface 10b is a covering film 60y in a state where a certain tension is applied. By covering, the shape of the container body 10 can be satisfactorily followed. In addition, since the overlapping positions of the respective covering films 60x and 60y are also on the long side surface 10a, positioning can be facilitated from other places on the storage container 10.

  Furthermore, in the second embodiment, the laminated surface coating 12c is located near the boundary between the long side surface 10a and the short side surface 10b, which often contacts and interferes with external devices, etc., compared to other parts of the storage container. By doing so, the strength of the coating itself can be improved.

In the above description, the long side surface 12a is shown as having a longer overall length than the laminated surface coating 12c in the long side surface 10a, but the length ratio between the long side surface coating 12a and the laminated surface coating 12c is arbitrary. It's okay.
(Embodiment 3)

  FIG. 8A is a perspective view including a front long side surface 10a showing a schematic configuration of the nonaqueous electrolyte secondary battery according to Embodiment 3 of the present invention, and FIG. It is a perspective view containing the long side surface 10a.

  The nonaqueous electrolyte secondary battery 3 according to the third embodiment includes a covering 13 that is configured by independent covering films that do not overlap each other. A description will be given below.

  As shown in FIGS. 8A and 8B, the long side surface 10a of the storage container 10 of the nonaqueous electrolyte secondary battery 3 is covered with a long side surface coating 13a that covers substantially the entire surface of the long side surface 10a. The short side surface 10b is covered with a short side surface coating 13b that covers almost the entire surface of the long side surface 10a.

  Further, as shown in the figure, the covering 13 is arranged such that both ends of the four coverings are adjacent to the boundary between the long side surface 10a and the short side surface 10b of the container body 10 containing the electrode body. Thus, the planar portion occupying most of the entire side surface of the container body 10 is covered. Each covering body constituting such a covering body 13 is composed of an independent planar covering film, and can be created by sticking to each side surface of the storage container 10a in any order.

  By providing such a covering 13, in the third embodiment, a uniformly flat surface adjacent to the boundary between the long side surface 10a and the short side surface 10b that generates a curved surface is covered with a coating film. Accordingly, it is possible to reduce the risk of wrinkles when the film is applied, to satisfactorily follow the shape of the container body 10, and to form a covering that remarkably facilitates positioning of the covering film.

  Furthermore, in this Embodiment 3, the heat dissipation of a battery can be improved by exposing the part in which a coating film is not provided in a storage container as the background of the container main body 10. FIG. In particular, when the nonaqueous electrolyte secondary battery 3 according to the third embodiment is used as a single battery of the power supply module, a spacer made of an insulating material can be disposed in an exposed portion between the respective coating films. Insulation between the single cells can be ensured.

  Furthermore, in the present embodiment, by using the fact that the long side surface coating 13a and the short side surface coating 13b are composed of independent coating films, as shown in the configuration example shown in FIG. The colors can be different from each other.

  A non-aqueous electrolyte secondary battery 4 shown in FIG. 9 has a short side surface having the same planar shape as the short side surface coating 13b instead of the short side surface coating 13b having the configuration shown in FIG. A covering body 13 having coverings 13c and 13c is provided.

  Accordingly, in addition to the configuration shown in FIG. 8, it is possible to easily identify, for example, the positive / negative polarity of the electrode terminal 31 using the difference in color of the short side surface coating 13a. In addition, when the surface color of the long side surface coating is changed, it is possible to easily distinguish the front surface and the back surface of the nonaqueous electrolyte secondary battery.

  In the configuration shown in FIG. 9, the color of the covering is changed by changing the color of the covering film that is the material of the covering, but the appearance of the entire covering is long side covering unit and / or short side. In addition to the color, the thickness and material of the coating film may be varied as long as the coating unit can be varied. Moreover, it is good also as a structure which attaches a pattern to a coating film, Furthermore, you may make it use selecting these structures all or suitably.

  As described above, according to the nonaqueous electrolyte secondary battery of the embodiment of the present invention, it is possible to obtain high reliability by covering the storage container with the covering bodies 11 to 13 along its outer shape with high accuracy. It becomes possible.

  However, the present invention is not limited to the above embodiments.

  In the above description, in the first embodiment, the covering body 11 is formed by a pair of two covering films 40x and 40y having the same shape, but the two sheets constituting the covering body of the present invention. The shape of the covering film may not be completely the same as long as the laminated surface covering 11c can be formed on the long side surface 10a. For example, the total length may be different between one and the other.

  Similarly, in Embodiment 2, as long as the laminated surface coating 12c can be formed on the long side surface 10a, the pair of coating films 60x may have different shapes. The same applies to the covering film 60y.

  Furthermore, in the first embodiment, as shown in the laminated surface coating 11c in FIG. 3B, the order of superimposing the sub-regions 40b in the completed covering 11 is different for each long side surface 10b. As shown in FIG. 10A, the present invention may be configured such that both ends of the covering film 40x overlap with both ends of the other covering film 40y, respectively.

  Similarly, in the second embodiment, the covering film 60y is all overlaid on the covering film 60x. However, as shown in FIG. 10B, the stacking order is partially changed. Also good.

  Furthermore, in the above description, in the coated film, the adhesive surface is formed by applying an adhesive to the entire surface on the side facing the container body 10, but the present invention is applied to a part of the adhesive film. Only the adhesive surface may be formed. Furthermore, the covering of the present invention may be composed of an insulating film that covers the storage container only with an adhesive.

  Furthermore, in the above description, both end portions of the plurality of covering films are the same long side surfaces, such as the end portions 40x1e and 40y2e and the end portions 40x2e and 40y1e of the covering films 40x and 40y of the first embodiment. Although it overlaps on 10a, it is good also as a structure which positions the edge parts of a coating film, without overlapping. As an example, in FIG. 11 (a), the covering films 40x and 40y are in contact with each other at the ends 40x1e and 40y2e, and the ends 40x2e and 40y1e to form the seam 11d. By covering the container main body 10, a uniformly flat coated body is formed.

  In this structure, since the edge part of each coating film is bonded together on the long side surface 10a, there exists an effect that it is hard to peel from the container main body 10. FIG. In particular, in the case of a power supply module in which the long side surfaces 10a are arranged to face each other, the seam 11d is hidden from the outside because it is located in the facing surface, so that contact with a jig or an operator is avoided during handling. Can be produced, and the effect of being difficult to peel off is achieved. In addition, the thickness is reduced by the amount that is not overlapped, and a space-saving power supply module can be obtained with reduced dimensions when arranged.

  Further, as shown in FIG. 11B, the ends 40x1e and 40y2e and the tips of the ends 40x2e and 40y1e are separated from each other to form a gap 11e that exposes the surface of the long side surface 10a. It is good also as a structure which coat | covers the container main body 10. In this case as well, the same effect as in FIG. 11A can be obtained, and the heat dissipation effect of the storage container can be improved by adjusting the size of the gap 11e.

  Similarly to the laminated surface coating 11c, each gap 11e is shifted from the center of the long side surface 10a and is disposed at a position where they do not face each other. Therefore, the power supply module arranged with the long side surfaces 10a facing each other. Even in this case, the insulating properties are secured between the storage containers. The gap 11e has the same size for each pair of long side surfaces 10a, but may be different from each other.

  In the above description, the electrode body of the present invention is a wound type, but may be a laminated type electrode body.

  In the above description, the storage element of the present invention is a non-aqueous electrolyte secondary battery 1 typified by a lithium ion secondary battery. However, if the battery can be charged and discharged by an electrochemical reaction, Nickel metal hydride batteries and other various secondary batteries may be used. Moreover, a primary battery may be sufficient. Furthermore, an element of a system that directly stores electricity as an electric charge, such as an electric double layer capacitor, may be used. In short, the power storage element of the present invention is not limited by its specific method as long as it can store electricity.

  In the above description, the storage container composed of the container body 10 and the lid portion 20 corresponds to the storage container of the present invention, and the covering 11 covers the container body 10. You may implement | achieve the coating body of this invention as a structure which coat | covers both a cover part and a container main body.

  In short, the present invention is not limited by the arrangement, role, and number of members constituting the storage container to be covered, as long as the storage container that stores the power generation element is covered.

  Although the container body 10 is made of aluminum, it may be made of an aluminum alloy, stainless steel or any other metal or metal compound. Further, although the shape is a rectangular parallelepiped, it may be a prismatic shape whose bottom surface is a triangle or a polygon that is a pentagon or more. Furthermore, a cylindrical shape may be sufficient.

  In particular, even if it has a polygonal prismatic shape, the width of a part of the side surfaces is different, and the ends of the coating film are the side surfaces of the set having the largest width among the plurality of sets of side surfaces If it is the structure which overlaps on the top, the surface after the covering of the widest side is finished beautifully, and there exists an effect which can obtain a covering with sufficient accuracy along the outline of a storage element after completion.

  In the above description, the single non-aqueous electrolyte secondary battery 1 is taken as an example. However, the present invention is not limited to the power storage element of the present invention. It may be realized as a power supply module comprising

  In short, the present invention may be implemented by adding various modifications to the above-described embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

  The present invention as described above has an effect that the power storage element can be accurately coated along the outer shape of the storage container, and is useful in a power storage element such as a secondary battery.

DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 10 Container main body 10a Long side surface 10b Short side surface 11 Covering body 11a Long side surface coating 11a1 Long side surface coating 11a2 Long side surface coating 11b Short side surface coating 11c Laminated surface coating 12 Electrode body 13 Container body 20 Lid part 21 Safety valve 22 Sealing plug 31 Electrode terminal 32 Packing 40x 40y Covering film 40x1, 40x2, 40x3, 40y1, 40y2, 40y3 Area 40x1e, 40x2e, 40y1e, 40y2e End

Claims (8)

An electrode body;
A storage container for storing the electrode body;
A covering that covers at least a side surface of the storage container;
The storage container has a plurality of pairs of opposing side surfaces,
All or some of the plurality of sets of side surfaces have different widths from each other,
The covering is formed of a plurality of insulating films, and ends of the insulating films are positioned on the side surface of the set having the largest width among the side surfaces of the plurality of sets.
Power storage element. The covering body covers the side surfaces by overlapping the end portions of the insulating film at one position for each side surface of the widest set of the plurality of side surfaces.
The electricity storage device according to claim 1. The covering body covers the side surfaces by overlapping the end portions of the insulating film at a plurality of positions for each side surface of the widest set of the plurality of side surfaces. ,
The electricity storage device according to claim 1. The overlapping positions on the side surfaces of the set having the largest width of the side surfaces of the plurality of sets of end portions of the insulating film are as follows:
As viewed from the side surface, all of the overlapping portions of the insulating film are positions that do not face each other.
The electrical storage element of Claim 2 or 3. The order of overlap of the end portions of each of the plurality of insulating films is changed for each side surface.
The electrical storage element in any one of Claim 2 to 4. An electrode body;
A storage container for storing the electrode body;
A covering formed by a plurality of insulating films covering at least a side surface of the storage container;
The storage container has a plurality of pairs of opposing side surfaces,
The covering body covers the side surface by arranging the plurality of insulating films only on each of the plurality of sets of side surfaces,
All or a part of the plurality of insulating films are different from each other in at least one of material, surface color or pattern, or thickness,
Power storage element.   A power supply module comprising at least one power storage element according to claim 1. A method of covering an electricity storage device that covers an electricity storage device having an electrode body and a storage container for housing the electrode body,
A coating step of coating a plurality of insulating films on at least a side surface of the storage container;
The storage container has a plurality of pairs of the side surfaces facing each other,
All or some of the plurality of sets of side surfaces have different widths from each other,
The covering step includes a step of overlapping the end portions of the insulating film on the side surface of the set having the largest width among the plurality of sets of side surfaces of the storage container.
A method for coating a storage element.

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