JP7056545B2 - How to process electrically insulating film - Google Patents

Description

The present invention relates to a method for processing an electrically insulating film.

Secondary batteries such as lithium-ion secondary batteries are attracting attention as a power source for mobile devices and as a power source for driving vehicles such as electric vehicles and hybrid vehicles. For example, Patent Document 1 includes, as a secondary battery, a band-shaped positive electrode sheet, a band-shaped negative electrode sheet, a wound electrode body in which a band-shaped separator sheet is wound around an axis, and the wound electrode body. A battery case and an insulating member in which an electrically insulating film is bent into a box shape, wherein the wound electrode body is arranged inside the insulating member, and the insulating member housed in the battery case. A secondary battery comprising the above is disclosed.

International Publication No. 2013/035668

By the way, when the electrically insulating film is bent at the planned bending portion to have a predetermined shape (for example, a box shape), the electrically insulating film is scheduled to be bent in order to make it easier to bend (fold accurately) at the planned bending portion. The part may be cut in half. In this case, if the thickness of the uncut portion (the uncut portion that is not half-cut in the half-cut scheduled bending portion) in the half-cut scheduled bending portion is too thick, the electrical insulating film will be accurate in the scheduled bending portion. There is a risk that it will not be able to bend well. On the other hand, if the thickness of the uncut portion in the half-cut scheduled bending portion is too thin, the strength of the scheduled bending portion decreases, and the electrically insulating film may break at the scheduled bending portion (bent portion). For this reason, it is required that the thickness of the uncut portion in the half-cut scheduled bending portion be within a preset appropriate range.

In order to meet this demand, after half-cutting the planned bending portion of the electrically insulating film, whether or not the thickness of the uncut portion in the scheduled bending portion of the electrically insulating film is within an appropriate range. Need to be inspected. However, it is not preferable to actually measure and inspect the thickness of the uncut portion in the planned bending portion because it takes time and cost. Therefore, there has been a demand for a method that can easily determine whether or not the thickness of the uncut portion in the planned bending portion is within an appropriate range.

The present invention has been made in view of the current situation, and it is possible to easily determine whether or not the thickness of the uncut portion in the planned bending portion is within an appropriate range. It is an object of the present invention to provide a method for processing a film.

One aspect of the present invention is a method for processing an electrically insulating film, which performs half-cut processing of an electrically insulating film using a half-cut processing apparatus, wherein the half-cut processing apparatus is one of the electrically insulating films. A first cutting blade that half-cuts the planned bending portion and a second cutting blade that half-cuts a portion of the electrically insulating film that is different from the planned bending portion, and is more than a half-cut by the first cutting blade. It has a second cutting blade for forming an inspection cut having a shallow cut depth with respect to the electrically insulating film, and at the same time, the first cutting blade half-cuts the bent portion of the electrically insulating film. The device for forming the inspection notch by the second cutting blade, and when the electrically insulating film is half-cut, the second cutting blade makes a half-cut to form the inspection notch. If this is the case, the thickness of the uncut portion in the planned bending portion half-cut by the first cutting blade is set to be within a preset appropriate range, and the electrical insulation property is set. The film processing method is a processing step of half-cutting the electrically insulating film using the half-cut processing apparatus, and the first cutting blade half-cuts the bent portion of the electrically insulating film. It is confirmed whether or not the inspection cut is formed in the processing step to be performed and the electrically insulating film that has completed the processing step, and if the inspection cut is formed, in the planned bending portion. This is a method for processing an electrically insulating film, comprising an inspection step of determining that the thickness of the uncut portion is within the appropriate range.

In the above-mentioned method for processing an electrically insulating film, a half-cut processing apparatus having a first cutting blade and a second cutting blade is used to perform half-cut processing of the electrically insulating film.
The first cutting blade is a cutting blade for half-cutting a portion of the electrically insulating film to be bent. The planned bending portion is a portion (a portion having a line of sight in a plane) existing at a position where the electrically insulating film is scheduled to be bent. For example, the electrically insulating film is electrically insulated by bending the electrically insulating film at the planned bending portion. This is a part for forming a sex film into a predetermined shape. By half-cutting the planned bending portion, the electrically insulating film can be easily bent at the planned bending portion (it can be bent with high accuracy).

Further, the second cutting blade is a cutting blade for half-cutting a portion of the electrically insulating film different from the portion to be bent (hereinafter, this portion is also referred to as an inspection portion). The second cutting blade is a cutting blade for forming an "inspection cut" having a shallower cutting depth in the electrically insulating film than the half cutting by the first cutting blade.
This half-cut processing device is configured to half-cut the portion to be bent of the electrically insulating film by the first cutting blade and at the same time to form an inspection notch by the second cutting blade. Note that half-cut means cutting (cutting) a part of the electrically insulating film in the thickness direction instead of cutting the entire film in the thickness direction.

Further, in this half-cut processing apparatus, when the half-cut processing of the electrically insulating film is performed, the half-cut by the second cutting blade is executed and the inspection cut is formed, and the first cutting blade is used. The thickness of the uncut portion in the half-cut scheduled bending portion is set so as to be within a preset appropriate range. That is, in this half-cut processing apparatus, when the half-cut processing of the electrically insulating film is performed, the half-cut by the second cutting blade is executed to form the inspection cut, and the first cutting blade is used. A first cutting blade and a second cutting blade are provided so that the thickness of the uncut portion in the half-cut scheduled bending portion is within a preset appropriate range. The uncut portion in the planned bending portion means a portion (uncut portion) in the scheduled bending portion that has been half-cut by the first cutting blade and has not been half-cut.

In the above-mentioned method for processing an electrically insulating film, such a half-cut processing device is used to perform half-cut processing on the electrically insulating film. Specifically, in the processing step, the electrically insulating film is half-cut using a half-cut processing device, and the planned bending portion of the electrically insulating film is half-cut by the first cutting blade. In this processing step, when the half-cut of the planned bending portion is properly executed (that is, the thickness of the uncut portion in the scheduled bending portion half-cut by the first cutting blade is within a preset appropriate range. In the case of the thickness of the above), a half cut is executed by the second cutting blade, and an inspection notch is formed in the electrically insulating film.

Next, in the inspection step, it is confirmed whether or not the inspection notch is formed in the electrically insulating film that has completed the above-mentioned processing step, and if the inspection notch is formed, the uncut portion is left in the planned bending portion. It is determined that the thickness of the portion is within the appropriate range (that is, the product is acceptable).
As described above, in the processing step, "when the electrically insulating film is half-cut, the first cutting blade is formed when the half-cut by the second cutting blade is executed and the notch for inspection is formed. A half-cut processing device is used in which the thickness of the uncut portion in the planned bending portion that has been half-cut by the above is set to be within a preset appropriate range.

For this reason, when an inspection notch is formed in the electrically insulating film that has been processed, the thickness dimension of the uncut portion in the planned bending portion is within an appropriate range (that is, that is, the thickness dimension is within an appropriate range. It can be judged that it is a passing product). On the contrary, if the notch for inspection is not formed in the electrically insulating film that has been processed, the thickness of the uncut portion in the planned bending portion is not within the appropriate range (that is, the rejected product). Is).

As described above, according to the above-mentioned processing method for the electrically insulating film, the thickness of the uncut portion in the planned bending portion becomes within the appropriate range by the simple operation of confirming the presence or absence of the notch for inspection. It is possible to judge whether or not the product is acceptable (that is, whether or not the product is acceptable). Therefore, according to the above-mentioned method for processing an electrically insulating film, whether or not the thickness of the uncut portion in the planned bending portion is within an appropriate range (that is, whether or not the product is acceptable). Can be judged.

It is a perspective view of the half-cut processing apparatus which concerns on embodiment. It is a top view (top view) of the half-cut processing apparatus. It is a partially enlarged view of the BB cross section of FIG. It is a top view (top view) of the electrically insulating film before the processing process. It is a top view (top view) of the electrically insulating film after a processing process. It is a partially enlarged view of the CC cross section of FIG. It is a top view (top view) of the electrically insulating film cut into a certain shape. It is a perspective view of the insulating member made of an electrically insulating film. It is a figure which shows the state which the wound electrode body is arranged inside the insulating member. It is a partial cross-sectional view of a non-aqueous electrolyte secondary battery.

(Embodiment)
Next, an embodiment of the present invention will be described with reference to the drawings. First, the half-cut processing apparatus 1 used in the present embodiment will be described.
As shown in FIGS. 1 to 3, the half-cut processing apparatus 1 includes a first roll 10 and a second roll 20. Of these, the first roll 10 has a cylindrical main body portion 10b and both end portions 10c having a cylindrical shape adjacent to both ends of the main body portion 10b. Both end portions 10c have a larger outer diameter than the main body portion 10b. The outer peripheral surface 10d of the main body 10b is provided with a first cutting blade 11 protruding from the outer peripheral surface 10d (see FIGS. 1 and 3). Further, the second roll 20 has a straight cylindrical shape and has a flat outer peripheral surface 20b.

The first roll 10 and the second roll 20 are arranged so as to face each other in the vertical direction in such a manner that the outer peripheral surfaces of both end portions 10c of the first roll 10 and the outer peripheral surface 20b of the second roll 20 are in contact with each other. .. Therefore, a gap is provided between the outer peripheral surface 10d of the main body portion 10b of the first roll 10 and the outer peripheral surface 20b of the second roll 20. Further, in the first roll 10 and the second roll 20, as shown by the arrows in FIG. 1, the rotation directions of the two rolls are opposite to each other, that is, the two facing rolls rotate in the forward direction. It is set to be.

In the half-cut processing apparatus 1 of the present embodiment, the electrically insulating film 60 is passed through the gap between the outer peripheral surface 10d of the main body portion 10b of the first roll 10 and the outer peripheral surface 20b of the second roll 20 (second). The electrically insulating film 60 is half-cut by the first cutting blade 11 while the electrically insulating film 60 is conveyed in the conveying direction DM by the second roll 20 or the like (so that it is in contact with the outer peripheral surface 20b of the roll 20). Perform processing. The transport direction DM corresponds to the length direction DL of the electrically insulating film 60. Further, as the electrically insulating film 60, for example, a resin film made of a polyolefin such as polypropylene or polyethylene can be mentioned.

The first cutting blade 11 is a cutting blade for half-cutting the planned bending portion 61 of the electrically insulating film 60. The planned bending portion 61 is a portion existing at a position where the electrically insulating film 60 is scheduled to be bent (a portion in a plane line of sight, a portion indicated by a two-dot chain line in FIGS. 2 and 4), and is scheduled to be bent. This is a portion for bending the electrically insulating film 60 in the portion 61 to form the electrically insulating film 60 into a predetermined shape (box shape in the present embodiment). By half-cutting the planned bending portion 61, the electrically insulating film 60 can be easily bent at the planned bending portion 61 (it can be bent with high accuracy).

The half-cut means not cutting the entire electric insulating film 60 in the thickness direction, but cutting (cutting) a part of the electrically insulating film 60 in the thickness direction (see FIG. 3). In the present embodiment, the groove-shaped cut portion 62 is formed by half-cutting the planned bending portion 61 by the first cutting blade 11 (see FIG. 6).

Further, in the half-cut processing apparatus 1 of the present embodiment, the first surface 60b of the electrically insulating film 60 is directed toward the first roll 10 side (hence, the second surface 60c of the electrically insulating film 60 is second. While the electrically insulating film 60 is conveyed in the conveying direction DM (with the roll 20 facing the side), the electrically insulating film 60 is half-cut by the first cutting blade 11. Therefore, the electrically insulating film 60 is half-cut from the first surface 60b side by the first cutting blade 11 to form a groove-shaped cut portion 62 that opens to the first surface 60b side (see FIG. 6).

Further, in the half-cut processing apparatus 1 of the present embodiment, the first cutting blade 11 is located on both ends of the outer peripheral surface 10d of the main body portion 10b of the first roll 10 and extends in the circumferential direction of the outer peripheral surface 10d (outer peripheral surface). A linear shape extending in parallel along the axial direction (direction along axis AX1, left-right direction in FIGS. 1 and 2) of the annular first cutting blade 11b and the first roll 10 (provided over the entire circumference of 10d). The first cutting blade 11c and the first cutting blade 11d extending in an oblique direction with respect to the axial direction of the first roll 10 from the intersection of the first cutting blade 11b and the first cutting blade 11c.

Further, in the half-cut processing apparatus 1 of the present embodiment, in addition to the first cutting blade 11, a second cutting blade 15 in a form protruding from the outer peripheral surface 10d is provided on the outer peripheral surface 10d of the main body portion 10b of the first roll 10. It is provided (see FIGS. 1 to 3). Specifically, the second cutting blade 15 is located on both ends of the outer peripheral surface 10d of the main body portion 10b of the first roll 10, forms an annular shape extending in the circumferential direction of the outer peripheral surface 10d, and forms the entire outer peripheral surface 10d. It is provided over the circumference. Specifically, the second cutting blade 15 is provided on the end side of the first roll 10 in the axial direction with respect to the first cutting blade 11b. The height of the second cutting blade 15 protruding from the outer peripheral surface 10d of the main body 10b (dimensions in the vertical direction in FIG. 3) is the height of the first cutting blade 11 protruding from the outer peripheral surface 10d (up and down in FIG. 3). It is lower than the dimension in the direction).

The second cutting blade 15 is a cutting blade for half-cutting a portion of the electrically insulating film 60 different from the planned bending portion 61 (a portion shown by a broken line in FIG. 4, this portion is referred to as an inspection portion 66). .. The second cutting blade 15 is a cutting blade for forming an "inspection notch 65" having a shallower cutting depth with respect to the electrically insulating film 60 than the half cutting by the first cutting blade 11 (see FIG. 3). ). Therefore, the depth of cut of the inspection notch 65 formed by half-cutting the inspection portion 66 by the second cutting blade 15 is the notch formed by half-cutting the planned bending portion 61 by the first cutting blade 11. It becomes shallower than the cutting depth of the portion 62 (see FIG. 6).

In the half-cut processing apparatus 1 of the present embodiment, the first roll 10 and the second roll 20 are rotated, and the electrically insulating film 60 is conveyed in the conveying direction DM by the second roll 20 and the like, while the first cutting blade 11 is conveyed. At the same time as half-cutting the scheduled bending portion 61 of the electrically insulating film 60, the second cutting blade 15 is configured to form an inspection notch 65.

Further, in the half-cut processing apparatus 1 of the present embodiment, when the half-cut processing of the electrically insulating film 60 is performed, the half-cut by the second cutting blade 15 is executed to form the inspection cut 65. In addition, the thickness dimension a (see FIG. 3) of the uncut portion 63 in the scheduled bending portion 61 half-cut by the first cutting blade 11 is set to be within a preset appropriate range. That is, in the half-cut processing apparatus 1 of the present embodiment, when the half-cut processing of the electrically insulating film 60 is performed, the half-cut by the second cutting blade 15 is executed to form the inspection cut 65. In addition, the first roll so that the thickness dimension a (see FIG. 3) of the uncut portion 63 in the scheduled bending portion 61 half-cut by the first cutting blade 11 is within the preset appropriate range. A first cutting blade 11 and a second cutting blade 15 are provided on the outer peripheral surface 10d of the main body portion 10b of 10.

The uncut portion 63 in the scheduled bending portion 61 means a portion (uncut portion) in the scheduled bending portion 61 that has been half-cut by the first cutting blade 11. That is, the uncut portion 63 is a portion of the planned bending portion 61 excluding the cut portion 62 half-cut by the first cutting blade 11 (a portion located on the second surface 60c side of the cut portion 62). (See FIG. 6).

Further, in the present embodiment, the electrically insulating film 60 having a thickness dimension of 150 ± 10 μm is used. With respect to the electrically insulating film 60, the appropriate range of the thickness dimension a of the uncut portion 63 in the planned bending portion 61 is set to a range of 30 μm or more and 90 μm or less. In the electrically insulating film 60 having a thickness dimension of 150 ± 10 μm, by setting the thickness dimension a of the uncut portion 63 to 90 μm or less, the electrically insulating film 60 can be bent accurately at the planned bending portion 61. .. Further, by setting the thickness dimension a of the uncut portion 63 to 30 μm or more, it is possible to prevent the electrically insulating film 60 from breaking at the planned bending portion 61 (the bent portion).

Specifically, in the present embodiment, the half-cut processing apparatus 1 is set so as to have the following processing dimensions (design values) (see FIG. 3).
a = 40 ± 10 μm
b = 130 ± 10 μm
c = 150 ± 10 μm
d = 4 ± 0.01 mm

Here, a (μm) is the thickness dimension (design value) of the uncut portion 63 in the planned bending portion 61 half-cut by the first cutting blade 11 (see FIG. 3). Further, b (μm) is a thickness dimension (design value) of the uncut portion 67 in the inspection portion 66 half-cut by the second cutting blade 15 (see FIG. 3). Further, c (μm) is the thickness dimension of the electrically insulating film 60. Further, d (mm) is the distance (pitch) between the centers of the adjacent first cutting blade 11 and the second cutting blade 15.

By setting the half-cut processing device 1 so as to satisfy the following relational expression (1), half-cut by the second cutting blade 15 is executed when the half-cut processing of the electrically insulating film 60 is performed. When the notch 65 for inspection is formed, the thickness dimension a (see FIG. 3) of the uncut portion 63 in the planned bending portion 61 half-cut by the first cutting blade 11 is within a preset appropriate range. Becomes the thickness of.
max (a) + max (c-b) ≤ max (appropriate range of a) ... (1)

In the present embodiment, the left side of the relational expression (1) = max (appropriate range of a) = 90 μm. Further, of the right side of the relational expression (1), max (a) = 50 μm and max (c-b) = max (c) -min (b) = 160-120 = 40 μm. Therefore, the right side of the relational expression (1) = max (a) + max (c−b) = 50 + 40 = 90.
Therefore, in the present embodiment, the half-cut processing device 1 is set so as to satisfy the relational expression (1).

Therefore, in the electrically insulating film 60 subjected to half-cut processing using the half-cut processing apparatus 1 of the present embodiment, when the inspection notch 65 (blade mark of the second cutting blade 15) is formed, it is bent. It can be determined that the thickness dimension a of the uncut portion 63 in the planned portion 61 is within an appropriate range (specifically, 30 μm or more and 90 μm or less) (that is, the product is acceptable). On the contrary, when the inspection notch 65 (the blade mark of the second cutting blade 15) is not formed, the thickness dimension a of the uncut portion 63 in the planned bending portion 61 is not within the appropriate range (that is,). , It is a rejected product).

Next, a method for processing the electrically insulating film according to the present embodiment will be described.
First, in the processing step, the half-cut processing of the electrically insulating film 60 is performed using the half-cut processing device 1. Specifically, the first roll 10 and the second roll 20 are rotated, and the electrically insulating film 60 is conveyed in the transport direction DM by the second roll 20 or the like, while being conveyed by the first cutting blade 11 of the first roll 10. The planned bending portion 61 of the electrically insulating film 60 is half-cut (see FIGS. 1 to 3).

In this processing step, when the half-cut of the scheduled bending portion 61 is properly executed (that is, the thickness dimension a of the uncut portion 63 in the scheduled bending portion 61 half-cut by the first cutting blade 11 is predetermined. In the case where the thickness dimension is within the set appropriate range), half-cutting is executed by the second cutting blade 15, and the inspection notch 65 is formed in the electrically insulating film 60 (when the thickness dimension is within the set appropriate range). See FIGS. 5 and 6). The inspection notch 65 extends linearly along the transport direction DM of the electrically insulating film 60 (that is, DL in the length direction of the electrically insulating film 60).

Next, in the inspection step, it is confirmed whether or not the inspection notch 65 (blade mark of the second cutting blade 15) is formed in the electrically insulating film 60 that has completed the above-mentioned processing step. When the inspection notch 65 (blade mark of the second cutting blade 15) is formed, the thickness dimension a of the uncut portion 63 in the planned bending portion 61 is within an appropriate range (specifically, 30 μm or more and 90 μm or less). Since it can be determined that the thickness is the same as that of the above, it is determined that the product is acceptable. On the other hand, when the inspection notch 65 (blade mark of the second cutting blade 15) is not formed, it is determined that the thickness dimension a of the uncut portion 63 in the planned bending portion 61 is not within the appropriate range. Therefore, it is judged as a rejected product.

In the present embodiment, the cut portion 62b of the cut portion 62 of the scheduled bending portion 61 is half-cut by the first cutting blade 11b (an annular blade extending in the circumferential direction of the outer peripheral surface 10d of the first roll 10). , Both ends of the DW in the width direction of the electrically insulating film 60 extend linearly along the transport direction DM of the electrically insulating film 60 (that is, DL in the length direction of the electrically insulating film 60) (FIG. FIG. 5 and FIG. 6). Further, the inspection notch 65 is adjacent to the notch portion 62b in the width direction DW and extends in parallel to the notch portion 62b (see FIGS. 5 and 6). Therefore, when two notches extending linearly along the length direction DL of the electrically insulating film 60 are formed side by side in the width direction DW on both ends of the width direction DW of the electrically insulating film 60. Can determine that the inspection notch 65 (the blade mark of the second cutting blade 15) is formed.

As described above, according to the method for processing the electrically insulating film of the present embodiment, the thickness dimension a of the uncut portion 63 in the planned bending portion 61 can be obtained by a simple operation of confirming the presence or absence of the inspection cut 65. It is possible to determine whether or not the thickness is within the appropriate range (that is, whether or not the product is acceptable). Therefore, according to the processing method of the electrically insulating film of the present embodiment, whether or not the thickness dimension a of the uncut portion 63 in the planned bending portion 61 is within an appropriate range (that is, a accepted product). Whether or not it is) can be determined.

The electrically insulating film 60 determined to be a pass product in the inspection process is then cut at regular length intervals, and as shown in FIG. 7, the electrically insulating film 60 having a constant shape (constant size) is combined with the electrically insulating film 60. Will be done. The electrically insulating film 60 is bent at a half-cut scheduled bending portion 61 and formed into a rectangular box-shaped (bag-shaped) insulating member 70 as shown in FIG.

The rectangular box-shaped (bag-shaped) insulating member 70 is used as a component of the non-aqueous electrolytic solution secondary battery 100 (see FIG. 10). Specifically, the insulating member 70 arranges (accommodates) the wound electrode body 150 inside itself and accommodates it in the battery case 110 (see FIGS. 9 and 10). Note that FIG. 9 is a schematic perspective view showing a state in which the wound electrode body 150 is arranged inside the insulating member 70 in the non-aqueous electrolytic solution secondary battery 100. Note that FIG. 9 omits the illustration of the battery case lid 115 with terminals and the like. Further, FIG. 10 is a partial cross-sectional view of the non-aqueous electrolytic solution secondary battery 100.

As shown in FIG. 10, the non-aqueous electrolyte secondary battery 100 is a lithium ion secondary battery including a rectangular battery case 110 and a wound electrode body 150 housed inside the battery case 110. The battery case 110 includes a rectangular box-shaped accommodating portion 111 having an opening 111d, and a battery case lid 115 with a terminal having a lid 113 for closing the opening 111d of the accommodating portion 111. The accommodating portion 111 and the lid 113 are integrated by welding all around.

The wound electrode body 150 has an elongated circular cross section, and a separator sheet 157 is interposed between the band-shaped positive electrode sheet 155 and the band-shaped negative electrode sheet 156, and these are wound around the axis AX3. (See FIG. 10). The wound electrode body 150 is located on one side DX1 (left side in FIG. 10) in the axial direction DX (direction along the axis AX3, left-right direction in FIG. 10), and only a part of the positive electrode sheet 155 is spiral. It has a positive electrode winding portion 155b that overlaps with the positive electrode winding portion 155b and a negative electrode winding portion 156b that is located on the other side DX2 (right side in FIG. 10) and only a part of the negative electrode sheet 156 overlaps in a spiral shape. The non-aqueous electrolytic solution 190 is contained inside the wound electrode body 150.

The battery case lid 115 with terminals has a lid 113, a first insulating member 180, a positive electrode terminal member 130, a negative electrode terminal member 140, and a second insulating member 170. Of these, the lid 113 has an elongated flat plate shape, and circular through holes penetrating the lid 113 are formed at both ends of the axial direction DX. A safety valve 113j is provided at the center of the lid 113 in the longitudinal direction. Further, in the lid 113, a liquid injection port 113n for injecting the non-aqueous electrolytic solution 190 into the accommodating portion 111 is formed between the safety valve 113j and the through hole. The liquid injection port 113n is sealed by a liquid injection plug 113m (see FIG. 10).

The positive electrode terminal member 130 is composed of a positive electrode connecting member 135, a positive electrode external terminal 137, and a positive electrode fastening member 139 (see FIG. 10). Of these, the positive electrode connecting member 135 is made of metal, is connected to the positive electrode winding portion 155b of the wound electrode body 150, and extends to the outside through the through hole of the lid body 113. The positive electrode external terminal 137 is made of metal, is located above the lid 113 (outside the battery case 110), and is electrically connected to the positive electrode connecting member 135 outside the battery case 110. The positive electrode fastening member 139 is a bolt made of metal, located outside the battery case 110, and fastens the positive electrode external terminal 137 and the bus bar (not shown).

The negative electrode terminal member 140 is composed of a negative electrode connecting member 145, a negative electrode external terminal 147, and a negative electrode fastening member 149 (see FIG. 10). Of these, the negative electrode connecting member 145 is made of metal and is connected to the negative electrode winding portion 156b of the wound electrode body 150 and extends to the outside through the through hole of the lid 113. The negative electrode external terminal 147 is made of metal, is located above the lid 113 (outside the battery case 110), and is electrically connected to the negative electrode connecting member 145 outside the battery case 110. The negative electrode fastening member 149 is a bolt made of metal, is located on the lid 113 (outside the battery case 110), and fastens the negative electrode external terminal 147 to the bus bar (not shown).

Further, the non-aqueous electrolytic solution secondary battery 100 includes an insulating member 70 obtained by molding an electrically insulating film 60 into a rectangular box shape (bag shape). The insulating member 70 has the wound electrode body 150 arranged (accommodated) inside itself and is accommodated in the battery case 110 (see FIGS. 9 and 10). Therefore, in the non-aqueous electrolytic solution secondary battery 100, an insulating member 70 made of an electrically insulating film 60 is interposed between the metal battery case 110 and the wound electrode body 150. Thereby, the electrically insulating film 60 (insulating member 70) can electrically insulate between the battery case 110 and the wound electrode body 150.

Although the present invention has been described above in accordance with the embodiment, it is needless to say that the present invention is not limited to the above embodiment and can be appropriately modified and applied without departing from the gist thereof.

1 Half-cut processing device 10 1st roll 11, 11b, 11c, 11d 1st cutting blade 15 2nd cutting blade 20 2nd roll 60 Electrically insulating film 61 Scheduled bending portion 62 Cut portion 63 Uncut portion of scheduled bending portion 65 Notch for inspection 66 Inspection part 67 Uncut part of inspection part 70 Insulation member (electrically insulating film)
100 Non-aqueous electrolyte secondary battery 110 Battery case 150 Winding electrode body a Thickness dimension of uncut part of planned bending part b Thickness dimension of uncut part of inspection part c Thickness dimension of electrically insulating film

Claims (1)

It is a processing method of an electrically insulating film that half-cuts an electrically insulating film using a half-cut processing device.
The half-cut processing device is
The first cutting blade that half-cuts the part to be bent in the electrically insulating film,
A second cutting blade that half-cuts a portion of the electrically insulating film that is different from the part to be bent, and has a shallower cutting depth in the electrically insulating film than the half-cut by the first cutting blade. With a second cutting blade, for forming a notch,
It is a device that half-cuts the bent portion of the electrically insulating film by the first cutting blade and at the same time forms the inspection cut by the second cutting blade.
When the electrically insulating film is half-cut, the bending is half-cut by the first cutting blade when the inspection cut is formed by the half-cut by the second cutting blade. The thickness of the uncut portion in the planned portion is set to be within the preset appropriate range.
The method for processing the electrically insulating film is as follows.
A processing step of half-cutting the electrically insulating film using the half-cut processing apparatus, wherein the first cutting blade half-cuts the bent portion of the electrically insulating film.
It is confirmed whether or not the inspection cut is formed in the electrically insulating film that has completed the processing step, and if the inspection cut is formed, the uncut portion in the planned bending portion is formed. A method for processing an electrically insulating film, comprising an inspection step of determining that the thickness is within the appropriate range.

Images