JP5909519B2 - Packing for coin-type battery and manufacturing method thereof - Google Patents

Description

  The present invention relates to a coin-type battery packing and a method for manufacturing the same, and more particularly to a coin-type battery packing that achieves an excellent injection moldability by improving the shape and a method for manufacturing the same.

  Coin-type batteries (sometimes called button-type batteries) have standardized shapes and voltages, are often round and thin, and are extremely small in size. Most of them are primary batteries, and types include lithium batteries, alkaline manganese batteries, silver oxide batteries, air-zinc batteries, mercury batteries, etc. In recent years, lithium batteries have been widely used in terms of life and high output. Yes.

  Since the button battery is extremely small, its power supply capacity is smaller than that of a normal dry battery, so that it consumes less power and is particularly used for products that require a power supply in an independent state.

  In particular, since it is often attached to the inside of a moving body due to downsizing, it is necessary to withstand an impact in some cases. It is also used in various meters and power supplies for measurement, and its uses are expanding.

  In recent years, from the viewpoint of infrastructure development and disaster risk management, interest in independent power systems such as backup power supplies for traffic lights, communication base stations, servers, and emergency lighting in refrigerated warehouses has increased. There is a need for a battery that can exhibit performance comparable to that of a normal temperature range even in a high temperature atmosphere. In particular, a coin-type battery has a wide range of use because it is small and easy to put in the apparatus.

  As described above, the environment surrounding the coin-type battery has changed, and quality characteristics required for the coin-type battery have become more severe.

  By the way, a general coin-type battery is provided with a positive electrode case, a negative electrode sealing plate, and a resin coin-type battery packing, and the positive electrode case is caulked to form a coin-type battery between the positive electrode case and the negative electrode sealing plate. The packing is compressed to seal the battery. Therefore, as the required levels of impact resistance and temperature characteristics are improved, higher quality coin-type battery packings are being demanded.

  For example, Patent Document 1 discloses a button type battery having an annular protrusion on the inner periphery of the bottom of a gasket having a U-shaped cross section (that is, packing). This gasket is provided with a thin rising portion from the viewpoint of securing a space for filling the active material of the battery. However, since such a gasket has a thin rising portion, the resin tends to be insufficiently filled, and molding is difficult. In addition, deformation may occur during processing due to insufficient strength of the thin portion.

  Patent Document 2 discloses a coin-type battery gasket including an outer cylinder part, an inner cylinder part shorter than the outer cylinder part, and a bottom connecting part that couples the outer cylinder part, and at least an upper part of the outer cylinder part. It is described that a part of the thickness is made larger than the width of the groove formed between the outer cylinder part and the inner cylinder part. According to such a configuration, the outer cylinder portion does not enter into the groove portion of another gasket during the transportation or the assembly process, and the deformation is not caused by the deformation during the transportation, and the operation rate in the assembly process is improved. Leads to. However, if the thickness is increased by increasing the thickness of the upper portion of the outer cylinder portion or providing an extreme convex portion, there is a possibility that sink marks are likely to occur. In addition, sink marks are likely to occur, resulting in lack of dimensional stability and an increase in defective products.

  In Patent Document 3, molten resin is injected from the injection port at the center of the gasket mold, injection molded, and then the boundary between the disk-shaped portion at the center of the gasket and the folded portion of the gasket is cut off. A method for obtaining a shaped gasket is described. However, in such a method, there is a possibility that a mold release failure in which the molded product is taken to the fixed side mold may occur in the disc-shaped injection portion. To prevent this, it is necessary to provide a considerably large product lock portion. If the product lock is large, the yield may be reduced. Further, if the product lock portion is small, mold release defects are likely to occur, and the operating rate may be reduced. Furthermore, there is a risk of damaging the mold by performing irregular work to remove the product taken by the fixed mold.

JP-A-8-124545 JP 2012-133902 A JP 2002-75303 A

  The present invention has been made in view of the problems of the prior art, and its purpose is to prevent the occurrence of defects such as cracks, burrs, sink marks, and the like, and has a small variation in shape and excellent in injection moldability. It is to provide a packing for use. The present invention also provides a method for producing such a coin-type battery packing.

In order to solve the above problems, a coin-type battery packing according to the present invention has any one of the following configurations (1) to ( 7 ). Moreover, the manufacturing method of the coin-type battery packing according to the present invention has the following configuration ( 8 ).
(1) An inner cylinder part, an outer cylinder part taller than the inner cylinder part, a circumferential groove formed at a position higher than the inner cylinder part on the inner peripheral surface of the outer cylinder part, and the outer cylinder part In the coin-type battery packing comprising the bottom connecting portion that joins the inner cylindrical portion, the angle formed by the upper side wall of the circumferential groove and the bottom surface of the circumferential groove is an obtuse angle, and the bottom surface of the circumferential groove is A coin-type battery packing, wherein a convex portion is provided, and a height of the convex portion is in a range of 30% to 90% with respect to a depth of the circumferential groove.
(2) The coin-type battery packing according to (1), wherein an angle formed by an upper side wall of the circumferential groove and a bottom surface of the circumferential groove is 100 ° or more and 160 ° or less.
(3) The coin-shaped battery packing according to (1) or (2), wherein the circumferential groove has a radius of 0.03 mm or more and 0.8 mm or less from the bottom surface to the upper side wall.
(4) The coin-type battery packing according to any one of (1) to (3), wherein an angle formed between an upper side surface of the convex portion and a lower side surface of the convex portion is an acute angle.
(5 ) By rounding the corner formed by the upper side surface and the lower side surface of the convex portion, a roundness having a radius of 0.01 mm or more and 0.10 mm or less is formed at the top portion of the convex portion. The coin-type battery packing according to any one of (1) to ( 4 ).
( 6 ) The coin-type battery packing according to any one of (1) to ( 5 ), which is made of a thermoplastic resin.
( 7 ) The coin-type battery packing according to ( 6 ), wherein the thermoplastic resin is polyphenylene sulfide.
( 8 ) A step of molding a packing using a fixed side mold and a movable side mold, a step of opening the mold while the molded packing is held on the movable side mold, and a mold held by the movable side mold (1) to ( 7 ), wherein a concave portion for holding the convex portion provided on the bottom surface of the circumferential groove of the packing is provided in the movable side mold. A method for producing a coin-type battery packing according to any one of the above.

  According to the present invention, it is possible to obtain a coin-type battery packing that is less likely to cause defects such as cracks, burrs, and sink marks, has a small variation in shape, and is excellent in injection moldability.

  Further, by using the coin-type battery packing of the present invention having a small variation in shape and high dimensional accuracy, it is possible to obtain good assembling properties at the time of assembling the battery, leading to an improvement in operating rate in the assembling process. In addition, since the sealing performance is improved by improving the dimensional accuracy, the internal resistance increases due to battery leakage and moisture ingress even when used in severe vibration environments or continuously in a high temperature atmosphere. Can be prevented. As a result, the safety of a product incorporating a coin-type battery is increased, and the product life is extended. Furthermore, the maintenance interval can be extended, and maintenance-free can be easily realized.

  In addition, since the coin-type battery using the coin-type battery packing of the present invention has excellent sealing properties, it is possible to place the battery at a site that could not be placed under the influence of vibration or temperature. As a result, the degree of freedom of battery arrangement in the product increases, and the degree of freedom of product design also improves.

  In addition, by using the coin-type battery packing of the present invention that has a small variation in shape and excellent sealing properties, the performance of the coin-type battery can be improved, so the number of batteries used in the product can be reduced. . As a result, the weight of the product can be reduced, and the incorporation of a coin-type battery into a mobile product or a moving body is promoted. From the above, by using the coin-type battery packing according to the present invention, a battery having excellent convenience can be obtained.

It is a schematic longitudinal cross-sectional view of the coin-type battery packing which concerns on one embodiment of this invention. It is a perspective view of packing for coin type batteries of the present invention. It is a schematic longitudinal cross-sectional view which shows an example of the conventional coin type battery packing. It is a general | schematic process drawing for demonstrating the manufacturing method of the coin-type battery packing of this invention, (a) is the state which filled the resin in the cabinet and solidified after injecting resin, (b) is a movable side. (C) shows a state in which the slide core has been moved, and (d) shows a state in which the protruding pin has moved and the packing has been taken out. It is a general | schematic process drawing for demonstrating the manufacturing method of the conventional coin-type battery packing, (a) is the state which filled the resin and solidified the resin after injecting resin, (b) moved the movable side The state in which the packing has moved to the operating side, (c) shows the state in which the slide core has moved, and (d) shows the state in which the protruding pin has moved and the packing has been taken out. It is another schematic process drawing for demonstrating the manufacturing method of the conventional coin-type battery packing, (a) is the state which filled and solidified the resin after injection | pouring resin, (b) is movable (C) shows a state where the slide core is moved, and (d) shows a state where the projecting pin is moved. It is a schematic longitudinal cross-sectional view which shows another example of the conventional coin-type battery packing. It is a schematic longitudinal cross-sectional view which shows another example of the conventional coin-type battery packing. It is a fragmentary longitudinal cross-section which shows an example of the structure of a coin-type battery. It is the elements on larger scale which show the structure of the circumferential groove | channel of the coin-type battery packing of this invention. It is the elements on larger scale which show the structure of the circumferential groove | channel of the conventional coin type battery packing.

  The present invention is described in detail below.

A coin-type battery packing according to the present invention (hereinafter also simply referred to as “packing”) includes an inner cylinder part, an outer cylinder part taller than the inner cylinder part, and an inner peripheral surface of the outer cylinder part. In a coin-type battery packing comprising a circumferential groove formed at a position higher than the inner cylinder part and a bottom connecting part that joins the outer cylinder part and the inner cylinder part, a side wall on the upper side of the circumferential groove and wherein the angle of the bottom surface of the circumferential groove Ri obtuse der convex portion is provided on a bottom surface of the circumferential groove, the height of the convex portion is 30% or more with respect to the depth of the circumferential groove and it is characterized in der Rukoto within the range of 90% or less.

  First, the outline of the coin-type battery packing and the coin-type battery will be described with reference to the drawings. As shown in the schematic perspective view of FIG. 2, the outer appearance of the coin-type battery packing 1 has a substantially ring shape. FIG. 9 is a schematic longitudinal sectional view showing an example of a coin-type battery using the coin-type battery packing 1. As shown in FIG. 9, the coin battery 91 is interposed between a bottomed cylindrical positive electrode case 92 that also serves as a positive electrode terminal, a negative electrode sealing plate 93 that also functions as a negative electrode terminal, and the positive electrode case 92 and the negative electrode sealing plate 93. A coin-type battery packing 1 is provided. In the positive electrode case 92, a positive electrode 96 and a negative electrode 94 are arranged opposite to each other with a separator 95 interposed therebetween, and further filled with an electrolytic solution. A negative electrode sealing plate 93 is disposed at the opening of the positive electrode case 92 via the coin-type battery packing 1, and the opening of the positive electrode case 92 is sealed by bending the opening end of the positive electrode case 92 inward. ing. In the coin-type battery 91 of FIG. 9, the end of the negative electrode sealing plate 93 is bent and brought into close contact with the caulking groove 7 of the coin-type battery packing 1, thereby further improving the sealing performance.

  An example of the coin type battery packing of the present invention is shown in FIG. In FIG. 1, a coin-type battery packing 1 is formed at a position higher than an inner cylinder part 2, an outer cylinder part 3 that is taller than the inner cylinder part 2, and an inner cylinder part 2 on the inner peripheral surface 8 of the outer cylinder part. The circumferential groove 4 extends in the circumferential direction, and includes a bottom connecting portion 6 that joins the outer cylindrical portion 3 and the inner cylindrical portion 2, and caulking is performed between the inner cylindrical portion 2 and the outer cylindrical portion 3. A caulking groove 7 is provided. The circumferential groove 4 provided on the inner peripheral surface 8 of the outer cylinder portion is open to the inside of the outer cylinder portion 3, and an angle (angle A) formed between the upper side wall 10 of the circumferential groove 4 and the bottom surface 9 of the circumferential groove 4. ) Is an obtuse angle. Further, the upper corner 11 and the upper end 12 of the circumferential groove 4 are rounded. The bottom surface 9 of the circumferential groove 4 is provided with a convex portion 5 that protrudes in the opening direction of the circumferential groove 4, and is formed by an upper side surface 13 of the convex portion 5 and a lower side surface 14 of the convex portion 5. The angle (angle B) is an acute angle.

  For comparison, an example of a conventional coin-type battery packing is shown in FIG. Unlike the coin-type battery packing 1 shown in FIG. 1, the conventional coin-type battery packing 31 shown in FIG. 3 has an angle (angle A) formed between the upper side wall 10 of the circumferential groove 4 and the bottom surface 9 of the circumferential groove 4. ) Is almost a right angle, and the circumferential groove 4 is not rounded. Since the other configuration of the coin-type battery packing 31 is the same as that of the coin-type battery packing 1 of FIG. 1, the description thereof is omitted by attaching the same reference numerals as in FIG.

  FIG. 5 is a schematic process diagram illustrating a method for manufacturing the conventional coin-type battery packing 31. FIG. 5A shows a state in which injection molding is performed using a mold 51 and resin is filled in the mold. The mold 51 includes a fixed mold 42, a movable mold 43, a slide core 46, and a projecting plate 48 provided with a projecting pin 47. A nest 55 having a shape that can be engaged with the recess 4 of the battery pack 31 is attached. In addition, about the gate position at the time of injection molding, since a figure becomes complicated, description is abbreviate | omitted.

  When the movable mold 43 is moved in the direction of the arrow 52 after the resin is filled, the coin-type battery packing 31 is taken out from the cavity 54 of the fixed mold 42 as shown in FIG. It moves together with the movable mold 43 while being held.

  Then, after the slide core 46 is moved in the direction of the arrow 53 as shown in FIG. 5C, the protrusion plate 48 provided with the protrusion pins 47 is moved in the direction of the arrow 56 as shown in FIG. The coin-shaped battery packing 31 is pushed out by the protruding pin 47. The coin-shaped battery packing 31 that has been pressed by the protruding pin 47 is pushed out of the insert 55 while being slightly elastically deformed, and as a result, the coin-shaped battery packing 31 is removed from the movable mold 43. Depending on the form and size of the coin-type battery packing 31, the coin-type battery packing 31 may be pushed out directly by the protruding pin 47 without setting the slide core 46.

  Here, in the conventional coin-type battery packing 31, as shown in FIG. 11, the side wall 10 on the upper side of the circumferential groove 4 is the direction in which the packing is removed (that is, the moving direction of the ejection pin 47 represented by the arrow 56). ), The circumferential groove 4 may be caught by the nest 55 during the removal shown in FIG. In addition, such catches may cause problems such as burrs and cracks, and it has been difficult to stably produce good products with conventional techniques.

  FIG. 7 is a view showing a coin-type battery packing 71 in which burrs have occurred. When the side wall 10 on the upper side of the circumferential groove 4 is perpendicular to the direction in which the packing is removed, the circumferential groove 4 is caught by the insert 55 and, as shown in FIG. May occur. When such burrs are present, there is a risk that a separator or the like will not be inserted when assembling the coin-type battery, resulting in poor fitting. As a result, the assembly production line is stopped, resulting in a decrease in yield.

  FIG. 8 is a view showing a coin-type battery packing 81 in which a crack has occurred. When the circumferential groove 4 is caught by the insert 55, an excessive load is locally applied, and as a result, a crack 82 may occur as shown in FIG. Such cracks may cause liquid leakage after assembling the coin-type battery, and may cause not only a coin-type battery but also a failure of an electronic device in which it is incorporated.

  Furthermore, in the conventional manufacturing method, the packing may remain in the fixed mold. Such an example is shown in FIG. Each process of FIG. 6 is almost the same as that of FIG. 5, but in FIG. 6, when the movable mold 43 is moved in the direction of the arrow 52 after filling the resin, as shown in FIG. The battery pack 31 remains in the stationary mold 42, and the coin battery pack 31 cannot be taken out of the mold even if the protruding plate 48 is operated. When such a mold release failure occurs, the product cannot be taken out, and it is necessary to temporarily stop the injection molding and take out the product from the fixed mold, resulting in a reduction in operating rate. As a result, it is difficult to manufacture the packing efficiently in a short time, which may increase the manufacturing cost.

  Furthermore, when a mold release failure occurs, the mold may be damaged when the product is taken out from the fixed mold, and it may take much time and cost to repair the mold. Further, if the molding is continued without noticing that a fine flaw has been made on the mold, a defective product will be generated greatly, which may increase the manufacturing cost.

  On the other hand, according to the present invention, it is possible to prevent the packing from being taken on the fixed side mold when the mold is opened, and further, when removing the packing from the movable side mold, there are problems such as burrs and cracks. It becomes possible to prevent. Hereinafter, this point will be described in detail.

  FIG. 4 is a schematic process diagram showing a method for manufacturing the coin-type battery packing 1 of the present invention shown in FIG. 1, and shows an example of a method for manufacturing the coin-type battery packing according to the present invention. FIG. 4A is a view showing a state in which injection molding is performed using a mold 41 and a resin is filled in the mold. The mold 41 includes a fixed mold 42, a movable mold 43, a slide core 46, and a protruding plate 48 provided with a protruding pin 47. A nest 45 having a concave portion 49 that can be engaged with the convex portion 5 of the battery pack packing 1 is attached. Depending on the form and size of the coin-type battery packing 1, the coin-type battery packing 1 may be pushed out directly by the protruding pin 47 without setting the slide core 46.

  When the movable side mold 43 is moved in the direction of the arrow 52 after the resin is filled, the coin-shaped battery packing 1 moves together with the movable side mold 43 while being held in the insert 45 as shown in FIG. To do. A convex portion 5 is provided on the bottom surface 9 of the circumferential groove 4 of the coin-type battery packing 1, and a concave portion 49 having a shape corresponding to the convex portion 5 is provided on the nest 45 of the movable mold 43. ing. According to such a configuration, the coin-shaped battery packing 1 can be satisfactorily held in the movable die 43 by fitting the convex portion 5 of the circumferential groove 4 and the concave portion 49 of the insert 45, so that the die When opening, it is possible to prevent a mold-release defect that the coin-type battery packing 1 remains in the stationary mold 42.

  Subsequently, after the slide core 46 is moved in the direction of the arrow 53 as shown in FIG. 4 (c), the protrusion plate 48 is moved in the direction of the arrow 56, and as shown in FIG. The coin battery packing 1 is pushed out from the movable mold 43 by 47. Here, the angle formed by the upper side wall 10 of the circumferential groove 4 and the bottom surface 9 of the circumferential groove 4 is an obtuse angle, and therefore the upper side wall 10 forms a gentle gradient with respect to the moving direction of the protruding pin 47. Yes. Further, the circumferential groove 4 is rounded from the bottom surface 9 to the upper side wall 10. According to such a configuration, by providing these gradients and roundness in the circumferential groove 4, the circumferential groove 4 is prevented from being caught in the insert 45. It can be removed smoothly from the mold 43, and the occurrence of defects such as burrs and cracks is effectively prevented. Further, since the mold release can be made smooth, deformation and distortion at the time of removal can be minimized, so that variation in shape is reduced and high dimensional accuracy can be achieved.

  FIG. 10 is an enlarged view illustrating the structure of the circumferential groove. In FIG. 10A, the angle formed between the upper side wall 10 of the circumferential groove 4 and the bottom surface 9 of the circumferential groove 4 is 120 °, and the upper side wall 10 has a protruding pin moving direction (indicated by an arrow 56). Direction). According to such a configuration, the outer cylinder portion 3 can move along the gradient of the upper side wall 10 when the protrusion pin is moved in the direction of the arrow 56, so that the coin-shaped battery packing 1 is moved to the movable side mold 43. Can be removed smoothly.

  FIGS. 10B and 10C show an example in which roundness is formed in a portion from the upper side wall 10 to the bottom surface 9 in the circumferential groove 4, that is, the upper corner 11 of the circumferential groove 4. . In FIG. 10B, the radius of roundness is 0.05 mm, and in FIG. 10C, the radius of roundness is 0.5 mm. Thus, it is preferable that the circumferential groove is rounded from the bottom surface to the upper side wall. By forming such roundness at the upper corner of the circumferential groove, the packing can be smoothly removed from the movable mold. The radius of roundness is preferably 0.03 mm to 0.8 mm, more preferably 0.05 mm to 0.5 mm, and still more preferably 0.08 mm to 0.3 mm. It is especially preferable that it is 0.1 mm or more and 0.25 mm or less. By setting the lower limit value of the radius within the above range, catching can be prevented and the defect rate can be reduced. In addition, by setting the upper limit value of the radius within the above range, it is possible to prevent a mold release failure in which the molded product remains in the fixed mold, and it is possible to maintain the operating rate at a high level.

  The angle formed by the upper side wall of the circumferential groove and the bottom surface of the circumferential groove (angle A in FIG. 1) is preferably an obtuse angle. More specifically, the angle is preferably from 100 ° to 160 °, more preferably from 100 ° to 150 °, even more preferably from 110 ° to 140 °, and from 115 ° to 130 It is particularly preferable that the angle is not more than °. By setting the lower limit value of the angle within the above range, catching can be prevented and the defect rate can be reduced. Further, by setting the upper limit value of the angle within the above range, it is possible to prevent a mold release failure in which the molded product remains in the fixed mold, and it is possible to maintain the operating rate at a high level.

Protrusions that provided on the bottom surface of the circumferential groove. By providing the convex portion, the packing 1 is satisfactorily held by the insert 45 of the movable mold 43 as shown in FIG. 4B, and the mold release failure when opening the mold is more effectively performed. Can be prevented.

The height of the projections provided on the bottom surface of the circumferential groove, the circumferential relative to the depth of the grooves state, and are 90% or less than 30%, more preferably 90% or less than 50%, 60% or more It is more preferably 90% or less, and particularly preferably 65% or more and 85% or less. By setting the upper limit of the height of the convex portion within the above range, it is possible to prevent the occurrence of burrs and cracks during product removal. Further, by setting the lower limit value of the height of the convex portion within the above range, the product can be stably moved while being held on the movable mold, and a mold release failure can be prevented.

  Further, the height of the convex portion provided on the bottom surface of the circumferential groove is preferably 0.03 mm to 0.1 mm, more preferably 0.05 mm to 0.1 mm, and 0.06 mm to 0. 0.09 mm or less is more preferable, and 0.07 mm to 0.08 mm is particularly preferable. By setting the upper limit of the height of the convex portion within the above range, it is possible to prevent the occurrence of burrs and cracks during product removal. Further, by setting the lower limit value of the height of the convex portion within the above range, the product can be stably moved while being held on the movable mold, and a mold release failure can be prevented.

Regarding the convex portion provided on the bottom surface of the circumferential groove, the angle formed by the upper side surface and the lower side surface is preferably an acute angle. More specifically, the angle formed by the upper side surface and the lower side surface is preferably 40 degrees or more and less than 90 degrees, more preferably 45 degrees or more and less than 90 degrees, and more preferably 60 degrees or more and 80 degrees or less. More preferably. By setting the upper limit value of the angle within the above range, the product can be moved while being stably held by the movable mold, and defective mold release can be prevented. Further, by setting the lower limit value of the angle within the above range, it is possible to minimize the force required when releasing from the movable mold using the protruding pin, and to prevent cracking.

  About the convex part provided in the bottom face of the circumferential groove | channel, it is preferable that the roundness is formed in the top part. More specifically, the radius of roundness is preferably 0.01 mm or more and 0.1 mm or less, preferably 0.02 mm or more and 0.08 mm or less, and 0.03 mm or more and 0.07 mm or less. More preferably, it is 0.04 mm or more and 0.06 mm or less. By setting the upper limit value of the radius of roundness within the above range, the product can be stably moved while being held in the movable mold, and a mold release failure can be prevented. Further, by setting the lower limit value of the radius within the above range, the product can be prevented from being strongly held by the movable mold, and cracking can be prevented when the product is taken out.

  The width of the convex portion provided on the bottom surface of the circumferential groove is preferably 0.05 mm or more and 0.25 mm or less, preferably 0.1 mm or more and 0.2 mm or less, and 0.13 mm or more and 0.17 mm or less. More preferably it is. By setting the lower limit value of the width within the above range, the product can be moved while being stably held by the movable mold, and defective mold release can be prevented. In addition, by setting the upper limit value of the width within the above range, the product can be prevented from being strongly held by the movable mold, and cracking can be prevented when the product is taken out.

  A plurality of circumferential grooves may be provided in the cylindrical axis direction. More specifically, the number of circumferential grooves is preferably 1 or more and 5 or less, and more preferably 1 or 2 rows.

  The shape of the circumferential groove may be a groove formed on the inner circumferential surface of the outer cylinder portion along the circumferential direction, and may be an annular shape or an arc shape. More specifically, the circumferential length of the circumferential groove is preferably 30% or more and 100% or less, and preferably 50% or more and 100% or less, based on the circumferential length of the inner peripheral surface of the outer cylinder portion. More preferably, it is 70% or more and 100% or less.

  The shape of the circumferential groove may be continuous or discontinuous.

  On the bottom surface of the circumferential groove, the convex portions may be provided in a plurality of rows in the cylindrical axis direction. More specifically, the number of convex portions formed in one circumferential groove is preferably 1 row or more and 10 rows or less, and more preferably 1 row or 2 rows.

  The circumferential length of the convex portion is preferably 30% or more and 100% or less, and preferably 50% or more and 100% or less, based on the circumferential length of the circumferential groove provided with the convex portion. Is more preferably 70% or more and 100% or less.

  The shape of the convex portion may be continuous or discontinuous.

  The position at which the convex portion is provided on the bottom surface of the circumferential groove is not particularly limited, but is preferably provided at or near the center of the circumferential groove.

  The number and position of the circumferential grooves and the number and position of the convex portions are not particularly limited, but it is preferable that the condition is such that the product can be held on the movable-side mold and cracks do not occur when the product is taken out.

  Regarding the position of the circumferential groove on the inner peripheral surface of the outer cylinder part, when the lower end of the outer cylinder part is 0% and the upper end is 100%, the upper end of the circumferential groove may be in a position of 50% or more and 95% or less. Preferably, it is in a position of 65% or more and 85% or less.

  In the coin-type battery packing of the present invention, (A) the angle formed by the upper side wall and the bottom surface in the circumferential groove is an obtuse angle, or (B) roundness is formed from the bottom surface of the circumferential groove to the upper side wall. However, from the viewpoint of realizing a stable and good operating rate, it is preferable to employ both the above configurations (A) and (B). By providing the configurations of (A) and (B), the molded product can be held on the movable mold when the mold is opened, and then the molded product is smoothly removed from the movable mold by the protrusion. be able to.

  Further, in the coin-type battery packing 1 of the present invention as illustrated in FIG. 1, the angle A and the roundness radius of the upper corner 11 are set as the element 1, and the angle B, the height and the roundness radius of the convex portion 5 are set as the elements. When it is 2, it is preferable that at least one or more elements are in the above-mentioned preferable range, and it is more preferable that both element 1 and element 2 are in the above-mentioned preferable range.

  In the coin-type battery packing of the present invention, it is preferable that the upper end of the circumferential groove is rounded. More specifically, the radius of roundness is preferably 0.02 mm or more and 0.2 mm or less.

  The coin battery packing in the present invention is preferably made of a thermoplastic resin. Examples of the thermoplastic resin include polyolefin (eg, polyethylene, polypropylene, polybutylene, polystyrene), polyamide (eg, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, aromatic nylon), polyimide, polyamideimide, Polycarbonate, polyester (eg, polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate), polyphenylene sulfide (PPS), polysulfoxide, polytetrafluoroethylene, acrylonitrile butadiene styrene copolymer (ABS), polyacetal, polyether, poly Examples include resins such as ether, ether, ketone, and polyoxymethylene.

  In addition, as the thermoplastic resin, a biological resin (for example, polylactic acid, polybutylene succinate, polyethylene succinate, etc.) may be used.

  Furthermore, it is also possible to use a derivative of the resin, a copolymer of the resin, or a mixture thereof.

  Among the thermoplastic resins, PP, PE, and polyphenylene sulfide (PPS) are particularly preferable, and an elastomer is preferably mixed.

  Moreover, it is preferable that the coin-type battery packing in the present invention contains a filler. By using the filler, the strength of the packing can be improved, and the durability of the packing is improved. As filler, glass fiber, metal fiber, carbon fiber, glass particle, aluminum hydroxide, magnesium hydroxide, silicate, iron oxide, carbon black, calcium carbonate, calcium sulfate, silica, titanium oxide, quartz powder, talc, Carillon, alumina, urostite, copper, aluminum, iron, silver, zinc particles and the like can be used, and glass fiber, metal fiber, and carbon fiber are preferable.

  The filler content is preferably 10% by weight to 60% by weight, more preferably 20% by weight to 50% by weight, more preferably 30% by weight to 50% by weight based on the total weight of the coin-type battery packing. % Or less is particularly preferable.

  The coin battery pack manufacturing method of the present invention includes a step of forming a packing using a fixed side mold and a movable side mold, and the mold is opened in a state where the molded packing is held on the movable side mold. It is preferable to include a step and a step of taking out the packing held by the movable mold.

  It is also possible to perform a step of moving the slide core after the slide core is installed in the movable mold and the mold is opened with the molded packing held in the movable mold. . By opening the mold and moving the slide core to create a space, the product can be taken out stably.

  As a method for forming the coin battery packing, it is preferable to use injection molding.

  In the injection molding, the type of gate used for resin filling is not particularly limited, and there is no problem as long as the resin filling can be completed. For example, the gate may be a film gate, a pin gate, or an under gate.

  Further, from the viewpoint of more reliably holding the molded packing in the movable mold when opening the mold, it is preferable that a convex portion is provided on the bottom surface of the circumferential groove of the packing. The mold is preferably provided with a concave portion for holding the convex portion provided on the bottom surface of the circumferential groove of the packing. In addition, this recessed part may be provided in movable mold itself, and may be provided in the nest | insert provided in the movable mold.

Hereinafter, the present invention will be described in detail based on Examples , Reference Examples and Comparative Examples. The test conditions in each example , reference example, and comparative example are basically the same as those in Example 1 unless otherwise specified.

(Example 1)
Using a resin containing 90% by weight of polyphenylene sulfide and 10% by weight of a polyester elastomer, injection molding was performed by the method shown in FIG. 4 to form a coin-type battery packing 1. First, as shown in FIG. 4A, injection molding is performed at 325 ° C. using a fixed mold 42 and a movable mold 43 having a nesting 45 corresponding to the shape of the coin-type battery packing 1. And coin-shaped battery packing 1 was formed. Next, as shown in FIG. 4B, after the movable mold 43 is moved in the direction of the arrow 52 and the mold is opened with the coin-shaped battery packing 1 held by the movable mold 43. 4C, the slide core 46 was moved in the direction of the arrow 53. As shown in FIG. Then, as shown in FIG. 4 (d), the protruding plate 48 provided with the protruding pin 47 was moved in the direction of the arrow 56 to protrude the molded product, thereby obtaining the coin-type battery packing 1 shown in FIG.
The dimensions of the obtained coin-type battery packing were as follows: the outer diameter was 25 mm, the inner cylinder part 2 was 2.0 mm high, the outer cylinder part 3 was 4.5 mm high, and the inner cylinder part 2 was 0. The thickness of 7 mm and the outer cylinder part 3 was 0.8 mm. The dimensions of the caulking groove 7 were 1.2 mm in width and 1.0 mm in thickness of the bottom connecting portion 6. The shape of the circumferential groove 4 was an annular groove provided over the entire circumference of the inner peripheral surface 8 of the outer cylinder portion. The dimensions of the circumferential groove 4 were a width of 0.3 mm and a depth of 0.11 mm. Further, the upper end 12 of the opening of the circumferential groove 4 was 1.0 mm away from the top of the outer cylinder portion 3 in the downward direction. In the circumferential groove 4, the angle formed between the bottom surface 9 and the upper side wall 10 is 120 degrees, and a roundness having a radius of 0.2 mm is formed in the upper corner 11 of the circumferential groove 4 from the bottom surface 9 to the upper side wall 10. It had been. A convex portion 5 is provided on the bottom surface 9 of the circumferential groove 4. The convex portion 5 has a width of 0.15 mm and a height of 0.08 mm. The angle formed by the upper side surface 13 of the convex portion 5 and the lower side surface 14 of the convex portion 5 is 70 degrees, and the top of the convex portion 5 is rounded with a radius of 0.06 mm.
When the manufacturing method of this example was carried out 1 million shots, the number of mold release defects during injection molding was 0, the number of burrs was 0, and the number of cracks was 0.
Moreover, when the coin-shaped battery 91 shown in FIG. 9 was assembled using the obtained coin-shaped battery packing, the number of occurrences of defects caused by the coin-shaped battery packing was 0 out of 1 million. .

( Reference Example 2)
A coin-type battery packing was manufactured in the same manner as in Example 1 except that the convex portion 5 was not provided on the bottom surface 9 of the circumferential groove 4.
The dimensions of the obtained coin-type battery packing were as follows: the outer diameter was 25 mm, the inner cylinder part 2 was 2.0 mm high, the outer cylinder part 3 was 4.5 mm high, and the inner cylinder part 2 was 0. The thickness of 7 mm and the outer cylinder part 3 was 0.8 mm. The dimensions of the caulking groove 7 were 1.2 mm in width and 1.0 mm in thickness of the bottom connecting portion 6. The shape of the circumferential groove 4 was an annular groove provided over the entire circumference of the inner peripheral surface 8 of the outer cylinder portion. The dimensions of the circumferential groove 4 were a width of 0.3 mm and a depth of 0.11 mm. Moreover, the opening part upper end 12 of the circumferential groove | channel 4 was separated 1.0 mm from the top of the outer cylinder part below. In the circumferential groove 4, the angle formed between the bottom surface 9 and the upper side wall 10 is 120 degrees, and a roundness having a radius of 0.2 mm is formed in the upper corner 11 of the circumferential groove 4 from the bottom surface 9 to the upper side wall 10. It had been. In addition, the convex part was not provided in the bottom face 9 of the circumferential groove | channel 4. FIG.
When the manufacturing method of this reference example was performed 1 million shots, the number of mold release defects during injection molding was 15, the number of burrs was 0, and the number of cracks was 0.
9 is removed from the obtained coin-shaped battery packing, and the coin-shaped battery 91 shown in FIG. 9 is assembled using the selected coin-shaped battery packing. Occurred twice per million.

( Reference Example 3)
In the circumferential groove 4, a coin shape is formed in the same manner as in Example 1 except that the angle formed by the bottom surface 9 and the upper side wall 10 is 90 degrees and a round shape having a radius of 0.01 mm is formed from the bottom surface 9 to the upper side wall 10. A battery packing was manufactured.
The dimensions of the obtained coin-type battery packing were as follows: the outer diameter was 25 mm, the inner cylinder part 2 was 2.0 mm high, the outer cylinder part 3 was 4.5 mm high, and the inner cylinder part 2 was 0. The thickness of 7 mm and the outer cylinder part 3 was 0.8 mm. The dimensions of the caulking groove 7 were 1.2 mm in width and 1.0 mm in thickness of the bottom connecting portion 6. The shape of the circumferential groove 4 was an annular groove provided over the entire circumference of the inner peripheral surface 8 of the outer cylinder portion. The dimensions of the circumferential groove 4 were a width of 0.3 mm and a depth of 0.11 mm. Moreover, the opening part upper end 12 of the circumferential groove | channel 4 was separated 1.0 mm from the top of the outer cylinder part below. In the circumferential groove 4, the angle between the bottom surface 9 and the upper side wall 10 is 90 degrees, and a roundness having a radius of 0.01 mm is formed in the upper corner 11 of the circumferential groove 4 from the bottom surface 9 to the upper side wall 10. It had been. A convex portion 5 is provided on the bottom surface 9 of the circumferential groove 4. The convex portion 5 has a width of 0.15 mm and a height of 0.08 mm. The angle formed by the upper side surface 13 of the convex portion 5 and the lower side surface 14 of the convex portion 5 is 70 degrees, and the top of the convex portion 5 is rounded with a radius of 0.06 mm.
When the manufacturing method of this reference example was carried out 1 million shots, the number of mold release defects during injection molding was 0, the number of burrs was 29, and the number of cracks was 10.
When a defective product is removed from the obtained coin-shaped battery packing and the coin-shaped battery 91 shown in FIG. 9 is assembled using the selected coin-shaped battery packing, defects caused by the coin-shaped battery packing are: It occurred 6 times in 1 million pieces.

Example 4
A coin-type battery packing was manufactured in the same manner as in Example 1 except that injection molding was performed at 220 ° C. using a polypropylene resin, and the packing size was changed.
The dimensions of the obtained coin-type battery packing were as follows: the outer diameter was 30 mm, the inner cylinder part 2 was 1.9 mm high, the outer cylinder part 3 was 5.5 mm high, and the inner cylinder part 2 was 0. The thickness of 65 mm and the outer cylinder part 3 was 1.1 mm. The size of the caulking groove 7 was 1.2 mm in width and 1.1 mm in thickness of the bottom connecting portion 6. The shape of the circumferential groove 4 was an annular groove provided over the entire circumference of the inner peripheral surface 8 of the outer cylinder portion. The dimensions of the circumferential groove 4 were a width of 0.4 mm and a depth of 0.09 mm. Further, the upper end 12 of the opening of the circumferential groove 4 was located 1.0 mm downward from the top of the outer cylinder. In the circumferential groove 4, the angle between the bottom surface 9 and the upper side wall 10 is 105 degrees, and a roundness having a radius of 0.45 mm is formed in the upper corner 11 of the circumferential groove 4 from the bottom surface 9 to the upper side wall 10. It had been. A convex portion 5 is provided on the bottom surface 9 of the circumferential groove 4. The convex portion 5 has a width of 0.10 mm and a height of 0.05 mm. The angle formed between the upper side surface 13 of the convex portion 5 and the lower side surface 14 of the convex portion 5 was 85 degrees, and a roundness with a radius of 0.09 mm was formed at the top of the convex portion 5.
When the manufacturing method of this example was carried out 1 million shots, the number of mold release defects during injection molding was 5, the number of burrs was 6, and the number of cracks was 2.
When a defective product is removed from the obtained coin-shaped battery packing and the coin-shaped battery 91 shown in FIG. 9 is assembled using the selected coin-shaped battery packing, defects caused by the coin-shaped battery packing are: It occurred 4 times out of 1 million.

(Example 5)
A coin-type battery was obtained in the same manner as in Example 1 except that injection molding was performed at 160 ° C. using a resin containing 95% by weight of a resin made of polyethylene and 5% by weight of an ether-based elastomer, and the dimensions of the packing were changed. The packing for was manufactured.
The dimensions of the coin-type battery packing obtained were as follows: the outer diameter was 35 mm, the inner cylinder part 2 was 2.0 mm high, the outer cylinder part 3 was 5.0 mm high, and the inner cylinder part 2 was 1. The thickness of 1 mm and the outer cylinder part 3 was 1.0 mm. The size of the caulking groove 7 was 1.5 mm in width, and the thickness of the bottom connecting portion 6 was 1.0 mm. The shape of the circumferential groove 4 was an annular groove provided over the entire circumference of the inner peripheral surface 8 of the outer cylinder portion. The dimensions of the circumferential groove 4 were a width of 0.3 mm and a depth of 0.10 mm. Further, the upper end 12 of the opening of the circumferential groove 4 was located 1.0 mm downward from the top of the outer cylinder. In the circumferential groove 4, the angle formed by the bottom surface 9 and the upper side wall 10 was 150 degrees, and a roundness with a radius of 0.08 mm was formed from the bottom surface 9 to the upper side wall 10. A convex portion 5 is provided on the bottom surface 9 of the circumferential groove 4. The convex portion 5 has a width of 0.15 mm and a height of 0.03 mm. The angle formed by the upper side surface 13 of the convex portion 5 and the lower side surface 14 of the convex portion 5 was 80 degrees, and the top of the convex portion 5 was rounded with a radius of 0.07 mm.
When one million shots of the manufacturing method of this example were carried out, the number of mold release failures during injection molding was 10, the number of burrs was 0, and the number of cracks was 0.
When a defective product is removed from the obtained coin-shaped battery packing and the coin-shaped battery 91 shown in FIG. 9 is assembled using the selected coin-shaped battery packing, defects caused by the coin-shaped battery packing are: It occurred 5 times in 1 million pieces.

(Comparative Example 1)
The same procedure as in Example 1 was performed except that the angle formed between the bottom surface 9 and the upper side wall 10 in the circumferential groove 4 was 90 degrees, and the convex portion 5 was not provided on the bottom surface 9 of the circumferential groove 4. A coin-type battery packing 31 shown in FIG. 3 was manufactured.
The coin-shaped battery packing 31 thus obtained has an outer diameter of 25 mm, an inner cylinder part 2 height of 2.0 mm, an outer cylinder part 3 height of 4.5 mm, and an inner cylinder part 2 thickness of 0. The thickness of the outer cylinder part 3 was 0.8 mm. The caulking groove 7 has a width of 1.2 mm and a thickness of the bottom connecting portion 6 of 1.0 mm. The shape of the circumferential groove 4 is an annular groove provided over the entire circumference of the inner peripheral surface 8 of the outer cylinder portion. The dimensions of the circumferential groove 4 are a width of 0.3 mm and a depth of 0.14 mm. Further, the upper end of the circumferential groove 4 was 0.8 mm away downward from the top of the outer cylinder portion. In the circumferential groove 4, the angle between the bottom surface 9 and the upper side wall 10 is 90 degrees, and a roundness having a radius of 0.01 mm is formed in the upper corner 11 of the circumferential groove 4 from the bottom surface 9 to the upper side wall 10. It had been. In addition, the convex part was not provided in the bottom face 9 of the circumferential groove | channel 4. FIG.
When the manufacturing method of this example was carried out 1 million shots, the number of mold release failures during injection molding was 20, the number of burrs was 64, and the number of cracks was 32.
When a defective product is removed from the obtained coin-shaped battery packing and the coin-shaped battery 91 shown in FIG. 9 is assembled using the selected coin-shaped battery packing, defects caused by the coin-shaped battery packing are: 1850 occurrences per million.

  The coin-type battery packing of the present invention, which has excellent injection moldability and high dimensional accuracy, can be used for all types of coin-type batteries, especially for mobiles, sensors, and independent devices that require impact resistance and temperature resistance. It is suitable for applications such as a power supply system.

DESCRIPTION OF SYMBOLS 1, 31, 71, 81 Coin type battery packing 2 Inner cylinder part 3 Outer cylinder part 4 Circumferential groove 5 Protrusion part 6 Bottom part connection part 7 Caulking groove 8 Inner peripheral surface 9 Bottom face 10 Upper side wall 11 Upper corner 12 Opening Upper end portion 13 Upper side surface 14 Lower side surface 41, 51 Mold 42 Fixed side die 43 Movable side die 44, 54 Cavity 45, 55 Nest 46 Slide core 47 Extrusion pin 48 Extrusion plate 49 Concavity 52 Movable side die Moving direction 53 Slide core moving direction 56 Ejecting pin and ejecting plate moving direction 72 Kaburi 82 Crack 91 Coin battery 92 Positive electrode case 93 Negative electrode sealing plate 94 Negative electrode 95 Separator 96 Positive electrode

Claims (8)

  An inner cylinder part, an outer cylinder part taller than the inner cylinder part, a circumferential groove formed at a position higher than the inner cylinder part on the inner peripheral surface of the outer cylinder part, the outer cylinder part and the inner cylinder part In the coin-type battery packing comprising a bottom connecting portion that joins the cylindrical portions, the angle formed by the upper side wall of the circumferential groove and the bottom surface of the circumferential groove is an obtuse angle, and a convex portion is formed on the bottom surface of the circumferential groove. The coin-type battery packing is provided, wherein a height of the convex portion is in a range of 30% to 90% with respect to a depth of the circumferential groove.   The coin-type battery packing according to claim 1, wherein an angle formed by an upper side wall of the circumferential groove and a bottom surface of the circumferential groove is 100 ° or more and 160 ° or less.   3. The coin-type battery packing according to claim 1, wherein the circumferential groove is rounded with a radius of 0.03 mm or more and 0.8 mm or less from the bottom surface to the upper side wall.   The coin-type battery packing according to any one of claims 1 to 3, wherein an angle formed by an upper side surface of the convex portion and a lower side surface of the convex portion is an acute angle. By rounding the corner formed by the upper side surface and the lower side surface of the convex portion, a roundness having a radius of 0.01 mm or more and 0.10 mm or less is formed at the top of the convex portion. The coin-type battery packing according to any one of claims 1 to 4 . The coin-type battery packing according to any one of claims 1 to 5 , comprising a thermoplastic resin. The coin-type battery packing according to claim 6 , wherein the thermoplastic resin is polyphenylene sulfide. A step of molding a packing using a fixed side mold and a movable side mold, a step of opening the mold while the molded packing is held on the movable side mold, and a packing held on the movable side mold retrieve and a step, recesses for holding the protrusions provided on the bottom surface of the circumferential groove of the packing is provided on the movable mold, according to one of claims 1 to 7 A method for manufacturing a coin-type battery packing.

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