WO2018199300A1 - 鉛蓄電池用セパレータ - Google Patents
鉛蓄電池用セパレータ Download PDFInfo
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- WO2018199300A1 WO2018199300A1 PCT/JP2018/017246 JP2018017246W WO2018199300A1 WO 2018199300 A1 WO2018199300 A1 WO 2018199300A1 JP 2018017246 W JP2018017246 W JP 2018017246W WO 2018199300 A1 WO2018199300 A1 WO 2018199300A1
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- rib
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- separator
- ribs
- base portion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a lead-acid battery separator made of a microporous film with ribs provided with a plurality of ribs at predetermined intervals.
- the polyethylene separator is configured as a part of the electrode group by wrapping the positive electrode plate or the negative electrode plate and bag processing.
- an electrode plate using an inexpensive expanded lattice may be used.
- the electrode plate may have a free (exposed) lead bar ledge at the end of the electrode plate. Since a pressing force is applied to the electrode group in the thickness direction, this bulge strongly presses the separator and may open a hole in the separator. This causes a short circuit.
- the protrusion of the lead bar is in contact with a flat surface opposite to the main rib surface of the separator (the surface on the side of the front and back surfaces where the main rib is provided), the separator is pressed.
- the lead-acid battery separator of the present invention aims to provide a lead-acid battery separator that does not open a hole in a separator made of a microporous film by an approach different from the above-described measures.
- the separator for a lead-acid battery of the present invention can suppress the opening of the separator on the flat surface, which is the surface opposite to the main rib surface, which is more easily opened when coming into contact with the bulge of the lead bar.
- the problem is solved by providing a mini-rib.
- a lead-acid battery separator is provided on a base portion that is a microporous film having a thickness of 0.1 to 0.3 mm and on one surface of the base portion.
- a plurality of main ribs, and a plurality of miniribs provided on the other surface of the base portion and having a height lower than the height of the main ribs, the plurality of miniribs being opposed surfaces of adjacent miniribs.
- the distance between the ribs, which is the distance between the two, is linearly provided so as to be less than 1.9 mm.
- the puncture strength is improved and short-circuiting is unlikely to occur.
- Explanatory drawing which shows the schematic image of the electrode plate and separator which comprise the electrode group of a liquid lead acid battery
- Explanatory drawing which shows an example of the cross-sectional shape of a separator Diagram explaining the relationship between the separator and the lead bar of the electrode plate Explanatory drawing for demonstrating the probability that the tip surface of the needle contacts the mini-rib
- Explanatory drawing showing various examples of cross-sectional shape of mini-rib
- FIG. 1 is an explanatory view showing a schematic image of an electrode plate 1 and a separator 2 constituting an electrode group of a liquid lead-acid battery.
- FIG. 2 is an explanatory diagram illustrating an example of a cross-sectional shape of the separator 2.
- the separator 2 is, for example, a polyethylene separator, and is processed into a bag by enclosing the electrode plates 1 that are alternately stacked positive and negative electrodes.
- the plurality of electrode plates 1 wrapped in the separator 2 constitute an electrode group and are accommodated in the battery case together with the electrolytic solution.
- the separator 2 has a base portion 3, a main rib 2a, and a mini-rib 2b.
- the base portion 3 is a flat thin sheet that is a microporous film.
- the base part 3 has a thickness of 0.1 mm or more and 0.3 mm or less, preferably 0.15 mm or more and 0.25 mm or less.
- the main rib 2a is a plurality of linear ribs provided on the main rib surface 3a that is one surface of the base portion 3 so as to protrude substantially perpendicularly from the main rib surface 3a.
- the main rib 2a secures a certain distance between the anode plate (electrode plate 1) and the separator 2, thereby preventing the base portion 3 from coming into direct contact with the surface of the anode plate and making it less susceptible to corrosion due to oxidation. It has a function, a function of easily discharging gas generated during charging, a function of securing a large amount of electrolyte that can freely flow, and the like.
- the main rib 2a may be in any known manner as long as it achieves these objects.
- the mini-rib 2b is a plurality of linear ribs provided so as to protrude substantially perpendicularly from the mini-rib surface 3b which is a surface (the other surface) opposite to the main rib surface 3a of the base portion 3.
- the mini-rib 2 b is provided for the purpose of preventing the protrusion (described later) of the lead bar formed at the end of the electrode plate 1 from coming into contact with the base 3.
- the minirib 2b is provided over the entire surface of the minirib surface 3b.
- the minirib 2b may be provided in a part of the minirib surface 3b, for example, in a region in the electrode plate 1 where the presence frequency of the protrusion of the lead bar is high. Thereby, it can suppress that a hole opens in the separator 2 more effectively.
- the mini-ribs 2b are linearly provided along a direction perpendicular to, parallel to, or oblique to the sheet flow direction in the pressure forming step during the production of the microporous film. It is preferable that the mini-rib 2b is provided in parallel with the flow direction of the sheet from the viewpoint of easy filling of the resin during pressure molding.
- the miniribs 2b are usually arranged in the vertical direction (vertical direction) when the battery is installed. For this reason, there also exists an effect which the separator 2 makes it easy to remove the bubble which arises from the electrode of a battery by charging / discharging reaction.
- the minirib 2b when the minirib 2b has an inclination with respect to the flow direction (vertical direction) of the sheet, it is preferably 30 degrees or less. Thereby, the minirib 2b is orientated substantially in the vertical direction when the electrode group of the lead storage battery is configured, and a gap is formed between the electrode plates 1 so as to penetrate in the vertical direction. For this reason, it is easy to escape the bubble generated from the electrode plate 1 upward, and it is possible to suppress an increase in electrical resistance due to the bubble accumulation.
- the mini-rib 2b has a quadrangular shape with respect to a cross-sectional shape perpendicular to the linear direction of the mini-rib 2b.
- the cross-sectional shape preferably has a rib width W of 0.1 to 1.0 mm, preferably 0.5 mm or less.
- the rib width W is larger than 1.0 mm, the area occupied by the mini-rib 2b on the mini-rib surface 3b is increased, and the thickness of the separator 2 is substantially increased. This can increase the electrical resistance of the separator. Therefore, it is preferable to make the rib width W as narrow as possible within a range that ensures improvement in the puncture strength. Further, when the rib width W is less than 0.1 mm, it becomes difficult to uniformly put the resin into the mold groove during the mini-rib molding.
- the mini-rib 2b has a rib height H lower than that of the main rib 2a, and is preferably 0.05 to 0.20 mm, for example.
- the rib height H is higher than the height of the main rib 2a, the height of the main rib 2a is relatively low, and the original function of the main rib cannot be performed sufficiently.
- the height H of the mini-rib 2b is less than 0.05 mm, it is difficult to obtain a function for avoiding the protrusion of the lead bar protruding from the electrode plate 1 from directly contacting the base portion 3 and contacting the mini-rib 2b. It is not preferable.
- the mini-rib 2b is formed such that the distance between the opposing surfaces of the adjacent mini-ribs 2b (hereinafter simply referred to as “rib distance P”) is less than 1.9 mm (0.75 in), preferably 1.0 mm or less.
- rib distance P is the width of the base portion 3 formed between the adjacent mini-ribs 2b, and is formed such that the width of the base portion 3 exposed at the mini-rib surface 3b is less than 1.9 mm.
- the inter-rib distance P decreases, the area occupied by the mini-rib 2b on the mini-rib surface 3b increases, and the thickness of the separator 2 increases substantially. Thereby, the electrical resistance of the separator 2 can be increased. Therefore, it is preferable that the inter-rib distance P is as large as possible within a range that ensures improvement in the puncture strength.
- the inter-rib distance P is preferably 0.2 mm or more, more preferably 0.45 mm or more, and even more preferably 0.5 mm or more.
- the polyethylene separator may constitute an electrode group together with an electrode plate made of an inexpensive expanded lattice.
- Such a plate may have a free lead bar ledge at the end of the plate.
- FIG. 3 is a diagram for explaining the relationship between the separator and the protrusion of the lead bar of the electrode plate.
- the pressing force F is applied to the electrode group (electrode plate 101) in the thickness direction, the protrusion of the lead bar 105 strongly presses the separator 102, and a hole is formed in the separator 102. May open. This can cause a short circuit of the electrode group.
- the separator 2 having the mini-rib 2b in the present embodiment can improve the puncture strength more effectively than simply increasing the thickness of the base portion 3. That is, as shown in FIG. 3B and FIG. 3C, the gap between the lead bar 5 and the base part 3 is maintained by the mini-rib 2b, and the edge part of the lead bar 5 that becomes the starting point of the resin breakage 5a (protrusion) can relieve stress concentration when piercing the separator 2. In other words, it is possible to avoid the protrusion of the lead bar 5 directly pressing the base portion 3 strongly. In other words, in the configuration of the electrode group to which the compression force F is applied, the protrusion of the lead bar 5 comes into contact with the mini-rib 2 b provided uniformly on the base portion 3 and does not come into direct contact with the base portion 3.
- the diameter of the lead bar 5 is generally about 1.9 to 2.0 mm.
- the inter-rib distance P is less than 1.9 mm.
- the mini-rib 2 b can serve to prevent the protrusion of the lead bar 5 generated on the electrode plate 1 from coming into direct contact with the base portion 3 of the separator 2.
- the inter-rib distance P is set to less than 0.95 mm, as shown in FIG. 3B, the protrusion of the lead bar 5 comes into contact with two or more mini-ribs 2b at the same time, and the effect is enhanced.
- the following values are used as one index indicating the puncture strength of the separator 2. That is, when a needle having a tip surface having a diameter of 1.9 mm is vertically pierced with respect to the minirib surface 3b side, the probability that the tip of the needle contacts the minirib (hereinafter simply referred to as “contact probability”) is the minirib line. It calculated
- the contact probability is calculated as follows: , The ratio of the width of the mini-rib 2b in contact with the needle, obtained from the width of the needle. This contact probability can also be used as an index indicating the degree to which the protrusion of the lead bar 5 is prevented from directly contacting the base portion 3 of the separator 2.
- the diameter of the needle 1.9 mm was determined according to the size of the needle used in the puncture resistance value (PUNCTURE RESISTANCE) test specified in BCI Battery Technical Manual, BCIS-03B of Battery Council International .
- the contact probability can be calculated as follows, for example.
- FIG. 4 is an explanatory diagram for explaining the probability that the tip surface 10a of the needle 10 is in contact with the mini-rib 2b.
- FIG. 4 shows an example in which the rib width W is 0.2 mm and the inter-rib distance P is 1.90 mm.
- the movement distance (mm) of the needle 10 along the direction of the distance P between ribs on the horizontal axis, and the tip surface 10a (hereinafter simply referred to as “needle 10”) of the needle 10 that moves on the vertical axis contact the minirib 2b.
- a graph for width (mm) is obtained.
- the contact width of the mini-rib 2b and the needle 10 is changed while repeatedly decreasing and increasing at a constant cycle, with 0 mm being the minimum value and 0.2 mm being the maximum value.
- the area S 1 and the area S 2 is obtained as follows.
- the ratio of the area S 2 in the area S 1, determined by regarding the ratio A L of the width of Miniribu 2b in contact with the needle 10. Specifically, the ratio AL is obtained from the following formula. Ratio A L area S 2 / area S 1 (1)
- the ratio AL is obtained as follows.
- the contact probability A p is the probability that Miniribu 2b is in contact with the needle 10
- the width of Miniribu 2b in contact while the needle 10 is moved one cycle the needle 10 determined from the ratio of the width W p.
- the contact probability Ap is obtained from the following equation.
- Contact probability A p (%) (mini-rib width W L ⁇ ratio A L ) / needle width W p ⁇ 100 (2)
- Contact probability A p obtained as above, 10% or more and 30% or less. As the width W p and the rib distance P of the needle equals 4, the contact probability A p is the case of less than 10%, the piercing strength is inadequate. If contact probability A p exceeds 30%, penetration of the electrolyte into the separator 2 is insufficient, there is a possibility that the electric resistance increases.
- minirib 2b is an example, and is not limited to this as long as it has a required piercing strength.
- the minirib 2b may be a combination of a plurality of linear miniribs in different directions.
- the minirib 2b may be formed in a lattice shape or a cross shape. If the probability of miniribs existing at intervals of 1.9 mm is the same and the distance between adjacent miniribs 2b is less than 1.9 mm, the piercing strength equivalent to that when a large number of miniribs 2b extending in the same direction are formed is provided. can get.
- the mini-rib 2b is not limited to a continuous line shape, and may be an intermittent broken line shape. Multiply the probability that mini-rib 2b exists in a broken line shape (for example, 80% if there is a 1-mm broken line in 5mm) by the probability of mini-ribs at 1.9mm intervals calculated in the part where mini-rib 2b exists. Thus, a continuous linear mini-rib 2b having the same mini-rib existence probability and an equivalent puncture strength can be obtained.
- the cross-sectional shape of the mini-rib 2b is not limited to a quadrangle.
- FIG. 5 is an explanatory view showing various examples of the cross-sectional shape of the mini-rib 2b.
- the cross-sectional shape of the mini-rib 2b is a square shape whose width is smaller than the height shown in FIG. 5 (a), a trapezoidal shape shown in FIG. 5 (b), a semicircular shape shown in FIG. 5 (c), and FIG.
- the top surface shown may be a dome-shaped rectangle.
- the cross-sectional shape is a dome-shaped trapezoid with the top surface shown in FIG. 5 (e), a trapezoidal shape with a curved side in the height direction shown in FIG. 5 (f), and the top shown in FIG. 5 (g).
- a square shape with chamfered corners may be used.
- a rectangular shape, a trapezoidal shape, a semicircular shape, or a combination thereof is preferable.
- the inter-rib distance P is a position that is half the rib height H.
- the distance between the opposing surfaces of the adjacent mini-ribs 2b in FIG. 5 is defined as an inter-rib distance P (see, for example, FIG. 5B).
- the average value of the rib heights H of the mini-ribs 2b has a rib height H lower than the height of the main rib 2a as described above.
- the average value is preferably 0.02 to 0.20 mm, for example.
- a puncture strength equivalent to that of a linear mini-rib having a uniform height can be obtained.
- the lead-acid battery separator 2 in the present embodiment described above has a mini-rib surface 3b that is a surface opposite to the main rib surface 3a on which the main rib 2a of the thin sheet made of a microporous film is formed, rather than the main rib 2a.
- a linear mini-rib 2b having a low height was formed.
- the protrusion of the lead bar exerts an effect that the separator 2 is strongly pressed and the opening of the separator 2 can be suppressed. That is, the lead-acid battery separator 2 improves (improves) the puncture strength and is less likely to cause a short circuit.
- Example 1 30 parts by mass of ultra high molecular weight polyethylene resin powder having a weight average molecular weight of 5 million as a thermoplastic resin, 70 parts by mass of silica fine powder having an average particle size of 15 ⁇ m as an inorganic powder, and paraffinic as a kind of mineral oil as a plasticizer The oil was mixed with a mixer. The obtained mixture was extruded from a T die into a sheet while heating and kneading with a twin-screw extruder, and pressure-molded by passing between a pair of molding rolls having grooves corresponding to rib patterns on both sides. .
- the main rib for electrode plate contact with a predetermined shape linear along the flow direction of the sheet on one surface of the sheet, and the predetermined shape linear along the flow direction of the sheet on the opposite surface thereof
- a nonporous film in which the mini-ribs were integrally molded was produced.
- the continuous non-porous film was passed in an n-hexane bath as an organic solvent in an immersed state, and extracted and removed leaving a part of the paraffinic oil.
- This film was passed through a drying furnace to produce a microporous film having a total thickness of 0.70 mm and a base portion thickness of 0.20 mm.
- the main rib has a trapezoidal cross section perpendicular to the linear direction of the main rib.
- the main rib has a main rib height of 0.30 mm, a main rib lower bottom width of 0.80 mm, and a distance between the main ribs of 10.0 mm.
- the bottom width of the main rib bottom is the width of the base end rising from the base portion.
- the distance between the main ribs is the distance between the opposing surfaces of the adjacent main ribs.
- the mini-rib has a rectangular cross-sectional shape perpendicular to the linear direction of the mini-rib.
- the minirib has a minirib height of 0.20 mm, a distance between miniribs of 0.53 mm, and a minirib width of 0.10 mm. The contact probability was 15%.
- Example 2 A separator was produced in the same manner as in Example 1 except that the base portion thickness was 0.25 mm and the main rib height was 0.25 mm in order to obtain a total thickness of 0.70 mm.
- Example 3 A separator was produced in the same manner as in Example 1 except that the base portion thickness was 0.15 mm and the main rib height was 0.35 mm in order to make the total thickness 0.70 mm.
- Example 4 A separator was produced in the same manner as in Example 1 except that the linear direction of the miniribs was perpendicular to the direction of the miniribs in Example 1.
- Example 5 A separator was produced in the same manner as in Example 1 except that the minirib width was 0.20 mm and the distance between the miniribs was 1.06 mm. The contact probability was 15%.
- Example 6 A separator was produced in the same manner as in Example 3 except that the distance between the miniribs was 1.70 mm and the minirib width was 0.20 mm. The contact probability was 10%.
- Example 7 A separator was produced in the same manner as in Example 6 except that the linear direction of the miniribs was perpendicular to the direction of the miniribs in Example 6.
- Example 8 A separator was manufactured in the same manner as in Example 6 except that the height of the main rib was 0.45 mm in order to set the mini-rib height to 0.10 mm and the total thickness to 0.70 mm.
- Example 9 A separator was produced in the same manner as in Example 6 except that the height of the main rib was 0.50 mm in order to set the minirib height to 0.05 mm and the total thickness to 0.70 mm.
- Example 10 A separator was produced in the same manner as in Example 5 except that the distance between the miniribs was 0.44 mm. The contact probability was 30%.
- Example 11 A separator was produced in the same manner as in Example 10 except that the base portion thickness was 0.25 mm and the main rib height was 0.25 mm in order to obtain a total thickness of 0.70 mm.
- Example 12 A separator was produced in the same manner as in Example 10 except that the base portion thickness was 0.15 mm and the main rib height was 0.35 mm in order to make the total thickness 0.70 mm.
- Example 1 A separator was produced in the same manner as in Example 1 except that no minirib was provided and the main rib height was 0.50 mm in order to make the total thickness 0.70 mm.
- Example 2 A separator was prepared in the same manner as in Example 1 except that the mini-ribs were not provided, the base portion thickness was set to 0.25 mm, and the main rib height was set to 0.45 mm in order to set the total thickness to 0.70 mm.
- Example 3 A separator was prepared in the same manner as in Example 1 except that the minirib was not provided, the base portion thickness was 0.15 mm, and the main rib height was 0.55 mm in order to make the total thickness 0.70 mm.
- Example 4 A separator was produced in the same manner as in Example 6 except that the height of the main rib was 0.53 mm in order to make the minirib height 0.02 mm and the total thickness 0.70 mm.
- Example 5 A separator was produced in the same manner as in Example 9 except that the main rib height was 0.52 mm in order to make the base portion thickness 0.13 mm and the total thickness 0.70 mm.
- Example 6 A separator was produced in the same manner as in Example 8 except that the distance between the miniribs was 1.8 mm and the minirib width was 0.10 mm. The contact probability was 5%.
- Example 8 A separator was produced in the same manner as in Example 12 except that the distance between the miniribs was 0.19 mm. The contact probability was 50%.
- ⁇ Puncture strength> A specimen was cut along the flow direction of the microporous film into a length of 20 mm and a width of 15 mm.
- a test piece is sandwiched between test piece fixing jigs with a 6.68 mm diameter hole, and the needle tip with a diameter of 1.9 mm is a cylindrical needle (iron bar) from the side of the mini-rib surface corresponding to the area where the main rib is not formed.
- Table 1 shows the number of specimens that were measured for 20 test specimens and had a strength of 10N or more. 10 or more were evaluated as “ ⁇ ⁇ ⁇ ⁇ ”, 5 or more as “ ⁇ ”, and less than 5 as “ ⁇ ”, and the breakthrough prevention effect during battery assembly was evaluated. If five or more pieces have a strength of 10 N or more, an effect of suppressing breakthrough due to the grid-like electrode plate during battery assembly can be expected.
- the separator was cut into a 70 mm ⁇ 70 mm square size to obtain a test piece.
- the electrical resistance of the test piece was measured with a test apparatus based on SBA S0402, which is a standard established by the Battery Association of Japan. Table 1 shows the relative values when the value of Example 1 is 100.
- Example 1 When Example 1 was set to 100%, a case having a relative value within 110% was regarded as acceptable.
- a positive electrode and a negative electrode made of a square lead plate having a size of 50 mm ⁇ 50 mm were stacked concentrically and in a square orientation with a separator cut into a 70 mm ⁇ 70 mm square shape.
- a 19.6 kPa pressure was applied to an electrode group consisting of one laminated positive electrode, one separator, and one negative electrode and incorporated in the battery case.
- 1000 ml of a diluted sulfuric acid electrolyte solution having a specific gravity of 1.300 (20 degrees) was injected, and a direct current of 5.0 A was passed at a liquid temperature of 50 ⁇ 2 degrees.
- the energization time at the time when the terminal voltage was 2.6 V or less or the voltage difference was 0.2 V or more was measured and defined as oxidation resistance time (h).
- Table 1 shows the relative values when the value of Example 1 is 100.
- Example 1 When Example 1 was set to 100%, a case having a relative value of 90% or more was regarded as acceptable.
- the puncture strength is 10 N or more.
- the number improved to 18 or more.
- Example 4 the linear direction of the mini-ribs was a direction perpendicular to the sheet flow direction, but an improvement in puncture strength equivalent to that in Example 1 was confirmed. Similarly, Example 7 also confirmed improvement in puncture strength equivalent to Example 6. This confirmed that the puncture strength does not depend on the linear direction of the minirib.
- Example 5 the minirib width is larger than that in Example 1 and the distance between the miniribs is large.
- the contact probability is equivalent to that in Example 1
- improvement in puncture strength equivalent to that in Example 1 was confirmed. .
- the improvement of the puncture strength depends on the contact probability.
- Example 6 Although the minirib width was larger than that in Example 3, the contact probability decreased from 15% in Example 3 to 10% because the distance between the miniribs was large. However, in the evaluation of the puncture strength, the number of test pieces having a strength of 10 N or more was 13 or more, and therefore, compared with Comparative Example 3, the improvement of the puncture strength due to the provision of the minirib was confirmed.
- Example 8 the contact probability was 10%, and even when the minirib height was lower than in Example 6, it was confirmed that the piercing strength was improved by the minirib as compared with Comparative Example 3. However, as the minirib height was reduced compared to Example 6, the tip of the needle was close to the base portion, and some test pieces had low puncture strength.
- Electrode 2 Lead-acid battery separator (separator) 2a main rib 2b mini-rib 3 base 3a main rib surface 3b mini-rib surface 5 lead bar 5a edge portion 10 needle 10a tip surface 101 electrode plate 102 separator 105 lead rod
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Abstract
Description
面積S1(面積S2+面積S3)=(横:1周期の移動距離2.1)×(縦:ミニリブ幅0.2)=0.42
面積S2=面積S1-面積S3=0.42-(0.4×0.20/2)=0.38
割合AL=面積S2/面積S1 (1)
割合AL=0.38/0.42=0.905
接触確率Ap(%)=(ミニリブ幅WL×割合AL)/針の幅Wp×100 (2)
接触確率Ap=(0.2×0.905)/1.90×100=9.53%
熱可塑性樹脂として重量平均分子量500万の超高分子量ポリエチレン樹脂粉末30質量部と、無機粉体として平均粒径15μmのシリカ微粉末70質量部と、可塑剤として鉱物オイルの1種であるパラフィン系オイルと、をミキサで混合した。得られた混合物を、2軸押出機にて加熱溶融混練しながらTダイからシート状に押し出し、両面にリブパターンに応じた溝を有するロールからなる一対の成形ロール間に通して加圧成形した。これにより、シートの一方の面にシートの流れ方向に沿って直線状の所定形状の極板当接用の主リブが、その反対側の面にシートの流れ方向に沿って直線状の所定形状のミニリブが、一体に成形加工された無孔質フィルムを作製した。次いで、連続した無孔質フィルムを、有機溶剤としてn-ヘキサンの液槽中に浸漬状態にて通過させ、パラフィン系オイルの一部を残して抽出除去した。このフィルムを、乾燥炉内を通過させて、総厚0.70mm、ベース部厚さ0.20mmの微多孔質フィルムを作製した。
ベース部厚さを0.25mmとし、総厚を0.70mmとするために主リブ高さを0.25mmにする以外は、実施例1と同様にしてセパレータを作製した。
ベース部厚さを0.15mmとし、総厚を0.70mmとするために主リブ高さを0.35mmにする以外は、実施例1と同様にしてセパレータを作製した。
ミニリブの線方向を、実施例1のミニリブの方向に対して垂直にする以外は、実施例1と同様にしてセパレータを作製した。
ミニリブ幅を0.20mm、ミニリブ間距離を1.06mmとする以外は、実施例1と同様にしてセパレータを作製した。接触確率は15%であった。
ミニリブ間距離を1.70mm、ミニリブ幅を0.20mmとする以外は、実施例3と同様にしてセパレータを作製した。接触確率は10%であった。
ミニリブの線方向を、実施例6のミニリブの方向に対して垂直にする以外は、実施例6と同様にしてセパレータを作製した。
ミニリブ高さを0.10mm、総厚を0.70mmとするために主リブ高さを0.45mmとする以外は、実施例6と同様にしてセパレータを作製した。
ミニリブ高さを0.05mm、総厚を0.70mmとするために主リブ高さを0.50mmとする以外は、実施例6と同様にしてセパレータを作製した。
ミニリブ間距離を0.44mmとする以外は、実施例5と同様にしてセパレータを作製した。接触確率は30%であった。
ベース部厚さを0.25mmとし、総厚を0.70mmとするために主リブ高さを0.25mmにする以外は、実施例10と同様にしてセパレータを作製した。
ベース部厚さを0.15mmとし、総厚を0.70mmとするために主リブ高さを0.35mmにする以外は、実施例10と同様にしてセパレータを作製した。
ミニリブを設けず、総厚を0.70mmとするために主リブ高さを0.50mmにする以外は、実施例1と同様にしてセパレータを作製した。
ミニリブを設けず、ベース部厚さを0.25mmとし、総厚を0.70mmとするために主リブ高さを0.45mmにする以外は、実施例1と同様にしてセパレータを作製した。
ミニリブを設けず、ベース部厚さを0.15mmとし、総厚を0.70mmとするために主リブ高さを0.55mmにする以外は、実施例1と同様にしてセパレータを作製した。
ミニリブ高さを0.02mm、総厚を0.70mmとするために主リブ高さを0.53mmとする以外は、実施例6と同様にしてセパレータを作製した。
ベース部厚さを0.13mm、総厚を0.70mmとするために主リブ高さを0.52mmとする以外は、実施例9と同様にしてセパレータを作製した。
ミニリブ間距離を1.8mm、ミニリブ幅を0.10mmとする以外は、実施例8と同様にしてセパレータを作製した。接触確率は5%であった。
ベース部厚さを0.27mmとする以外は、実施例11と同様にしてセパレータを作製した。
ミニリブ間距離を0.19mmとする以外は、実施例12と同様にしてセパレータを作製した。接触確率は50%であった。
ベース部厚さを0.13mm、総厚を0.70mmとするために主リブ高さを0.37mmとする以外は、実施例11と同様にしてセパレータを作製した。
微多孔質フィルムの流れ方向に沿って長さ20mm×幅15mmに裁断して試験片とした。直径6.68mmの穴が開いた試験片固定冶具に試験片を挟み、主リブが形成されていない領域に対応するミニリブ面側より、直径1.9mmの針先が円筒形状の針(鉄棒)を、速度60mm/minの条件で突刺した。試験片が破断した最大荷重を、突刺強度とした。
セパレータを70mm×70mmの正方形サイズに裁断して試験片とした。電池工業会(Battery Association of Japan)の定める規格であるSBA S0402に準拠した試験装置で、試験片の電気抵抗を測定した。なお、表1には、実施例1の値を100とした場合の相対値を表示した。
50mm×50mmの正方形状の鉛板製の正極および負極を、70mm×70mmの正方形状に裁断したセパレータを挟んで、同心状にかつ正方形状の向きを合わせて積層した。積層した1枚の正極、1枚のセパレータ、1枚の負極からなる電極群に19.6kPa加圧して電槽内に組み込んだ。比重1.300(20度)の希硫酸電解液を1000ml注入し、液温度50±2度で5.0Aの直流定電流を流した。端子電圧が2.6V以下または電圧差が0.2V以上となった時点の通電時間を測定し、耐酸化時間(h)とした。なお、表1には、実施例1の値を100とした場合の相対値を表示した。
2 鉛蓄電池用セパレータ(セパレータ)
2a 主リブ
2b ミニリブ
3 ベース部
3a 主リブ面
3b ミニリブ面
5 鉛棒
5a エッジ部
10 針
10a 先端面
101 極板
102 セパレータ
105 鉛棒
Claims (6)
- 厚さが0.1~0.3mmの微多孔質フィルムであるベース部と、
前記ベース部の一方の面に設けられた複数の主リブと、
前記ベース部の他方の面に設けられ、前記主リブの高さよりも高さが低い複数のミニリブと、を備え、
前記複数のミニリブは、隣り合うミニリブの対向する面の距離であるリブ間距離が1.9mm未満となるように線状に設けられることを特徴とする鉛蓄電池用セパレータ。 - 前記他方の面側に対して直径1.9mmの先端面を有する針を垂直に突刺す際に、前記針の先端が前記ミニリブに接する確率が10%以上、30%以下であることを特徴とする請求項1に記載の鉛蓄電池用セパレータ。
- 前記針が、前記ミニリブに対する接触幅を、一定周期で減少と増加を繰り返しながら変化させている場合において、前記確率は、前記針が前記周期の1周期分移動する間に接する前記ミニリブの幅と、前記針の幅から求められる、前記針に接する前記ミニリブの幅の割合を使うことを特徴とする請求項2に記載の鉛蓄電池用セパレータ。
- 前記ミニリブは、0.05~0.20mmのミニリブ高さを有することを特徴とする請求項1に記載の鉛蓄電池用セパレータ。
- 前記ベース部は、0.15~0.25mmの厚さを有することを特徴とする請求項1に記載の鉛蓄電池用セパレータ。
- 前記ミニリブは、前記微多孔質フィルム作製時の加圧成形工程のシートの流れ方向に平行な方向に沿って、線状に設けられることを特徴とする請求項1に記載の鉛蓄電池用セパレータ。
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JP2019514663A JP7084381B2 (ja) | 2017-04-28 | 2018-04-27 | 鉛蓄電池用セパレータ |
EP18789980.2A EP3618146A4 (en) | 2017-04-28 | 2018-04-27 | LEAD-ACID BATTERY SEPARATOR |
CN202211187894.0A CN115548574A (zh) | 2017-04-28 | 2018-04-27 | 铅蓄电池用隔板 |
CN201880027411.6A CN110546784B (zh) | 2017-04-28 | 2018-04-27 | 铅蓄电池用隔板 |
US16/606,710 US11158908B2 (en) | 2017-04-28 | 2018-04-27 | Separator for lead acid storage battery |
JP2022000952A JP2022037239A (ja) | 2017-04-28 | 2022-01-06 | 鉛蓄電池用セパレータ |
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JPWO2019088040A1 (ja) * | 2017-10-31 | 2020-11-19 | 日本板硝子株式会社 | 鉛蓄電池用セパレータおよび鉛蓄電池 |
JP7348080B2 (ja) | 2020-01-08 | 2023-09-20 | 古河電池株式会社 | 液式鉛蓄電池 |
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JPH02155161A (ja) | 1988-12-07 | 1990-06-14 | Nippon Muki Kk | 鉛蓄電池用セパレータ並びにその製造法 |
US20020004166A1 (en) * | 1999-04-16 | 2002-01-10 | Daniel E. Weerts | Battery separator with improved shoulders |
JP2013508917A (ja) * | 2009-10-20 | 2013-03-07 | ダラミック エルエルシー | 横断リブを有する電池セパレータおよび関連する方法 |
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US5985484A (en) * | 1997-10-20 | 1999-11-16 | Amtek Research International Llc | Battery separation |
US6132899A (en) * | 1997-10-20 | 2000-10-17 | Amtek Research International Llc | Battery Separator having different size ribs and method of making the same |
JP4417232B2 (ja) | 2004-11-29 | 2010-02-17 | 古河電池株式会社 | 鉛蓄電池 |
EP2619817B1 (en) * | 2010-09-22 | 2018-12-19 | Daramic, LLC | Batteries, separators, components, and compositions with heavy metal removal capability and related methods |
CN112542654A (zh) * | 2014-01-02 | 2021-03-23 | 达拉米克有限责任公司 | 多层隔板及制造和使用方法 |
EP3642893A4 (en) | 2017-06-20 | 2021-03-24 | Daramic, LLC | ENHANCED LEAD-ACID BATTERY SEPARATORS, BATTERIES AND RELATED PROCESSES |
CN111295779A (zh) | 2017-10-31 | 2020-06-16 | 日本板硝子株式会社 | 铅蓄电池用隔板以及铅蓄电池 |
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JPH02155161A (ja) | 1988-12-07 | 1990-06-14 | Nippon Muki Kk | 鉛蓄電池用セパレータ並びにその製造法 |
US20020004166A1 (en) * | 1999-04-16 | 2002-01-10 | Daniel E. Weerts | Battery separator with improved shoulders |
JP2013508917A (ja) * | 2009-10-20 | 2013-03-07 | ダラミック エルエルシー | 横断リブを有する電池セパレータおよび関連する方法 |
Cited By (3)
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JPWO2019088040A1 (ja) * | 2017-10-31 | 2020-11-19 | 日本板硝子株式会社 | 鉛蓄電池用セパレータおよび鉛蓄電池 |
JP7245168B2 (ja) | 2017-10-31 | 2023-03-23 | エンテックアジア株式会社 | 鉛蓄電池用セパレータおよび鉛蓄電池 |
JP7348080B2 (ja) | 2020-01-08 | 2023-09-20 | 古河電池株式会社 | 液式鉛蓄電池 |
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CN110546784A (zh) | 2019-12-06 |
CN115548574A (zh) | 2022-12-30 |
US20200136117A1 (en) | 2020-04-30 |
US11158908B2 (en) | 2021-10-26 |
EP3618146A1 (en) | 2020-03-04 |
CN110546784B (zh) | 2023-09-12 |
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EP3618146A4 (en) | 2020-12-09 |
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