WO2016013149A1 - 円筒型電池 - Google Patents
円筒型電池 Download PDFInfo
- Publication number
- WO2016013149A1 WO2016013149A1 PCT/JP2015/003019 JP2015003019W WO2016013149A1 WO 2016013149 A1 WO2016013149 A1 WO 2016013149A1 JP 2015003019 W JP2015003019 W JP 2015003019W WO 2016013149 A1 WO2016013149 A1 WO 2016013149A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery case
- sealing member
- central axis
- battery
- opening end
- Prior art date
Links
- 238000007789 sealing Methods 0.000 claims abstract description 73
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 239000008151 electrolyte solution Substances 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 description 16
- 238000002474 experimental method Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 5
- 239000013013 elastic material Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/133—Thickness
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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 cylindrical battery equipped with a battery case, such as a lithium ion secondary battery.
- a cylindrical battery such as a lithium ion secondary battery includes a bottomed cylindrical battery case, an electrode group housed in the battery case together with an electrolyte, a disk-shaped sealing member that seals the opening of the battery case, An annular gasket interposed between the opening of the battery case and the sealing member is provided.
- the opening of the battery case is subjected to drawing processing, whereby the gasket is compressed and the sealing member is fixed to the opening of the battery case.
- the opening end of the battery case is bent or bent toward the center axis side of the battery case.
- a constricted portion extending in an annular shape is formed. Then, the gasket is compressed by the open end portion and the constricted portion, and the peripheral edge portion of the sealing member is sandwiched by the compressed gasket.
- a pressure reducing mechanism such as a pressure reducing valve has been provided on the sealing member in order to prevent the battery case from being damaged due to an increase in the internal pressure of the cylindrical battery.
- the sealing member was firmly fixed with respect to the battery case in order to make the decompression mechanism fully exhibit the decompression capability (for example, refer patent document 1 or 2).
- the following measures are conceivable as measures for preventing the battery case from being damaged due to an increase in internal pressure in a small cylindrical battery. That is, when the internal pressure of the cylindrical battery rises, the sealing member is dropped from the battery case using the internal pressure before the internal pressure reaches a pressure that causes damage to the battery case. As a means for realizing this, it is usually conceivable to loosely fix the sealing member to the battery case. However, in this case, the airtightness of the battery case is lowered, and the electrolyte is liable to leak. Thus, in a small cylindrical battery, it has been difficult to achieve both safety in terms of preventing damage to the battery case and sealing properties in terms of preventing leakage of the electrolyte.
- an object of the present invention is to provide a small cylindrical battery having both safety and sealing performance.
- a cylindrical battery according to the present invention includes a bottomed cylindrical battery case, an electrode group housed in the battery case together with an electrolyte, a disk-shaped sealing member that seals an opening of the battery case, and a battery case And an annular gasket interposed between the opening and the sealing member.
- the battery case has an opening end that is curved or bent toward the center axis side of the battery case, and a constricted portion formed in an annular shape around the central axis, and the gasket is compressed by the opening end and the constricted portion.
- the peripheral portion of the sealing member is sandwiched between the compressed gaskets.
- the outer diameter of a battery case is 10 mm or less.
- the first corresponding line corresponding to the periphery of the sealing member in the projection image of the sealing member on the virtual plane perpendicular to the central axis of the battery case, and the leading edge of the opening end portion in the projection image of the opening end portion on the virtual plane When the second corresponding line corresponding to is considered, the shift amount d of the second corresponding line from the first corresponding line to the central axis side satisfies ⁇ 0.1 mm ⁇ d ⁇ + 0.5 mm.
- the cylindrical battery according to the present invention realizes both safety and airtightness despite its small size.
- FIG. 6 is a scatter diagram showing a relationship between a deviation amount and a vent pressure.
- a cylindrical battery according to the present invention includes a bottomed cylindrical battery case, an electrode group housed in the battery case together with an electrolyte, a disk-shaped sealing member that seals an opening of the battery case, and a battery case And an annular gasket interposed between the opening and the sealing member.
- the battery case has an opening end that is curved or bent toward the center axis side of the battery case, and a constricted portion formed in an annular shape around the central axis, and the gasket is compressed by the opening end and the constricted portion.
- the peripheral portion of the sealing member is sandwiched between the compressed gaskets.
- the outer diameter of a battery case is 10 mm or less.
- the outer diameter of the battery case is 6 mm or less.
- the first corresponding line corresponding to the periphery of the sealing member in the projection image of the sealing member on the virtual plane perpendicular to the central axis of the battery case, and the leading edge of the opening end portion in the projection image of the opening end portion on the virtual plane When the second corresponding line corresponding to is considered, the shift amount d of the second corresponding line from the first corresponding line to the central axis side satisfies ⁇ 0.1 mm ⁇ d ⁇ + 0.5 mm.
- the above range of the deviation amount d is obtained based on the later-described experiment conducted by the present inventors. According to the above range of the deviation amount d, during normal use of the cylindrical battery, even when the battery temperature rises and the internal pressure rises, the sealing member is prevented from falling off, In the event of an abnormality in the device, even if the battery overheats and the internal pressure rises excessively, the sealing member is removed from the battery case using the internal pressure before the battery case is damaged. I can do it. Further, according to the above range of the deviation amount d, the gasket is appropriately compressed, and as a result, it is difficult for the electrolyte to leak. Therefore, according to the cylindrical battery, although it is small in size, it has safety in terms of preventing damage to the battery case and sealing properties in terms of preventing leakage of the electrolyte. Coexistence is realized.
- the front end edge of the opening end portion is inclined obliquely toward the side opposite to the bottom portion of the battery case.
- the distance z from the upper surface of the peripheral edge of the sealing member to the position corresponding to the tip edge of the opening end in the direction along the central axis of the battery case satisfies 0.1 mm ⁇ z ⁇ 0.3 mm. It is preferable.
- the upper surface is a surface that faces upward when the cylindrical battery is installed with the opening end of the battery case facing upward.
- the average compression ratio R of the gasket satisfies 10% ⁇ R ⁇ 60%. Thereby, high sealing performance is realized in the cylindrical battery.
- FIG. 1 is a cross-sectional view conceptually showing a cylindrical battery according to an embodiment of the present invention.
- the cylindrical battery includes a bottomed cylindrical battery case 1, an electrode group 2 housed in the battery case 1 together with the electrolyte, and a disk shape that seals the opening 11 of the battery case 1. Sealing member 3 and an annular gasket 4 interposed between the opening 11 of the battery case 1 and the sealing member 3.
- the battery case 1 includes an opening end portion 111 that is curved or bent toward the central axis 1a side of the battery case 1, and a constricted portion 112 that is formed in an annular shape around the central axis 1a. .
- Such a battery case 1 is manufactured as follows. First, a deep drawing process is performed on a stainless steel plate having a uniform thickness, thereby forming a battery case 1 in which the opening end portion 111 is not curved or bent and has no constricted portion 112. Then, the electrode group 2 is housed in the battery case 1, and then the constricted portion 112 is formed by subjecting the battery case 1 to lateral drawing. Next, the gasket 4 is inserted into the opening 11 of the battery case 1.
- the gasket 4 is positioned by the constricted portion 112. Then, the electrolytic solution is injected into the battery case 1, and then the opening end portion 111 is curved by subjecting the opening portion 11 of the battery case 1 to horizontal drawing while the sealing member 3 is placed inside the gasket 4. Or bend. As a result, the sealing member 3 is fitted into the opening 11 of the battery case 1 via the gasket 4. That is, in the cylindrical battery, the gasket 4 is compressed by the opening end portion 111 and the constricted portion 112, and the peripheral edge portion 31 of the sealing member 3 is sandwiched by the compressed gasket 4. Further, the compressed gasket 4 is in close contact with the inner surface of the battery case 1 and the peripheral edge 31 of the sealing member 3. Thereby, the sealing property of a cylindrical battery is improved.
- the outer diameter D of the battery case 1 (specifically, the outer diameter of the portion different from the portion subjected to the horizontal drawing process (the opening end portion 111 and the constricted portion 112)) is 10 mm or less, preferably 6 mm or less. It is.
- the thickness T of the side wall 12 of the battery case 1 preferably satisfies 0.05 mm ⁇ T ⁇ 0.25 mm, and particularly preferably satisfies T ⁇ 0.15 mm.
- the thickness T of the side wall 12 of the battery case 1 is larger than 0.25 mm, the battery case 1 is hardly deformed, and a large internal pressure is required to drop the sealing member 3.
- the thickness T of the side wall 12 of the battery case 1 is smaller than 0.05 mm, the battery case 1 is easily deformed, and the electrolyte is liable to leak.
- the sealing member 3 is made of a conductive material such as stainless steel or aluminum.
- the gasket 4 is made of an elastic material.
- the elastic material include polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and crosslinked rubber.
- the flexural modulus k of the elastic material constituting the gasket 4 preferably satisfies 0.4 GPa ⁇ k ⁇ 1.4 GPa.
- Electrode Group 2 includes a negative electrode plate 21, a positive electrode plate 22, and a separator 23.
- the negative electrode plate 21 and the positive electrode plate 22 are overlapped with each other and wound with a separator 23 interposed therebetween.
- the winding end portion of at least one of the negative electrode plate 21 and the positive electrode plate 22 is fixed to the outer peripheral surface of the electrode group 2 with a fixing tape so that the electrode group 2 is not wound.
- the configuration of the electrode group 2 is not limited to this.
- the negative electrode plate 21 is electrically connected to the battery case 1 via the negative electrode lead 51, and the battery case 1 functions as a negative electrode terminal.
- the negative electrode lead 51 has one end electrically connected to the negative electrode plate 21 and the other end joined to the inner surface of the battery case 1 by welding means such as spot welding.
- the other end of the negative electrode lead 51 may be electrically connected to the battery case 1 by bringing it into contact with the inner surface of the battery case 1.
- the positive electrode plate 22 is electrically connected to the sealing member 3 via the positive electrode lead 52, and the sealing member 3 functions as a positive electrode terminal.
- one end of the positive electrode lead 52 is electrically connected to the positive electrode plate 22 and the other end is joined to the bottom surface of the sealing member 3 by welding means such as spot welding.
- the positive electrode lead 52 is passed through an annular electrical insulating member 6 disposed between the electrode group 2 and the sealing member 3, and the electrical insulating member 6 allows the positive electrode lead 52 to be connected to the negative electrode lead 51 and the battery case 1. It is prevented from touching.
- FIG. 2 is a diagram used for explaining the above conditions.
- a virtual plane C perpendicular to the central axis 1a of the battery case 1 is considered.
- the first corresponding line L1 corresponding to the peripheral edge 3a of the sealing member 3 and the tip of the opening end 111 in the projection image of the opening end 111 on the virtual plane C.
- a second corresponding line L2 corresponding to the edge 111a.
- the second corresponding line L2 from the first corresponding line L1 to the central axis 1a side is a condition for ensuring both safety and sealing.
- the deviation amount d satisfies ⁇ 0.1 mm ⁇ d ⁇ + 0.5 mm, and particularly preferably satisfies d ⁇ + 0.1 mm.
- the leading edge 111a of the opening end 111 is obliquely directed to the side opposite to the bottom 13 of the battery case 1, and the above condition is satisfied in this state.
- the distance z from the upper surface 31a of the peripheral edge 3a of the sealing member 3 to the position corresponding to the tip edge 111a of the opening end 111 in the direction along the central axis 1a of the battery case 1 is 0.1 mm ⁇ z ⁇ . It is preferable to satisfy 0.3 mm.
- the upper surface 31a is a surface that faces upward when the cylindrical battery is installed with the open end 111 of the battery case 1 facing upward.
- the average compression rate R of the gasket 4 satisfies 10% ⁇ R ⁇ 60%. This is because high sealing performance is realized in the cylindrical battery.
- the state in which the average compression ratio R satisfies 10% ⁇ R ⁇ 60% is easily realized when the above-described condition regarding the shift amount d is satisfied, and the leading edge 111a of the opening end 111 is formed on the battery case 1. Even when it is directed obliquely to the side opposite to the bottom portion 13, it is easily realized in the same manner.
- the thickness and material of the gasket 4 may be selected so that the average compression rate R satisfies 10% ⁇ R ⁇ 60%.
- the present inventors produced 17 types of cylindrical batteries in which at least one of the shift amount d, the distance z, and the average compression rate R is different (Examples 1 to 17).
- Conditions other than the shift amount d, the distance z, and the average compression rate R are as follows.
- stainless steel is used as the material constituting the battery case 1
- the outer diameter D of the battery case 1 is 3.6 mm
- the thicknesses were 0.08 mm and 0.1 mm, respectively, and the height of the battery case 1 was 35.1 mm.
- any of Examples 1 to 17 stainless steel is used as the material constituting the sealing member 3, the outer diameter of the sealing member 3 is 2.8 mm, and the thickness of the peripheral portion 31 of the sealing member 3 is 0.8. It was 25 mm. Further, in any of Examples 1 to 17, PFA having a flexural modulus k of about 0.6 GPa was used as the elastic material constituting the gasket 4.
- the distance h in Table 1 is the distance from the constricted portion 112 to the position corresponding to the tip edge 111a of the open end 111 in the direction along the central axis 1a of the battery case 1. In this experiment, the position at which the depth of the constricted portion 112 is the largest is adopted as the position of the constricted portion 112 serving as a reference for the distance h (see FIG. 2).
- FIG. 3 is a scatter diagram in which the measurement results are plotted on the coordinates where the horizontal axis and the vertical axis are the displacement amount d and the vent pressure Pv, respectively.
- the present inventors examined the presence or absence of electrolyte leakage for each of the cylindrical batteries (see Table 1). In the experiment for examining the leakage of the electrolyte, five 17 kinds of cylindrical batteries were prepared and stored in an atmosphere at 60 ° C.
- the inventors set a preferable range of the vent pressure Pv as 4 MPa ⁇ Pv ⁇ 25 MPa.
- the vent pressure Pv is 4 MPa or more, the sealing The member is prevented from falling off.
- the vent pressure Pv is 25 MPa or less, the internal pressure is reduced before the battery case 1 is damaged. Can be used to drop the sealing member 3 from the battery case 1.
- the preferable range of the shift amount d is considered to change according to the size of the outer diameter D of the battery case 1. Specifically, as the outer diameter D of the battery case 1 increases, the sealing member 3 is more likely to drop off at a lower internal pressure. This is because the total pressure applied to the sealing member 3 increases in proportion to the opening area of the battery case 1.
- the preferred range of the shift amount d is a cylindrical battery having a battery case 1 whose outer diameter D is 3.6 mm. It is considered that it is included in the range of ⁇ 0.1 mm ⁇ d ⁇ + 0.5 mm determined by the group.
- Table 2 shows the same results as in the above experiment for the cylindrical battery (Example 18) in which the outer diameter D of the battery case 1 is 6 mm and the cylindrical battery (Example 19) in which the outer diameter D of the battery case 1 is 10 mm. It shows the results of the experiment.
- the shift amount d was +0.02 mm
- the distance z was 0.19 mm
- the distance h was 0.80 mm
- the average compression rate R was 30%.
- the outer diameter of the sealing member 3 was 5.36 mm in Example 18, and was 9.36 mm in Example 19.
- Other conditions regarding the cylindrical battery are the same as those of the cylindrical batteries of Examples 1 to 17.
- the vent pressure Pv was 6.0 MPa in Example 18, and 4.1 MPa in Example 19.
- These vent pressures Pv satisfy a preferred range (4 MPa ⁇ Pv ⁇ 25 MPa), and the deviation d (0.02 mm) employed in these cylindrical batteries is determined by the present inventors. It is included in the range ( ⁇ 0.1 mm ⁇ d ⁇ + 0.5 mm).
- the average compression ratio R (30%) employed in these cylindrical batteries is included in the above range (10% ⁇ R ⁇ 60%) determined by the present inventors.
- the sealing member 3 is prevented from falling off even when the battery temperature rises and the internal pressure rises during normal use of the cylindrical battery. If the battery is abnormally overheated and the internal pressure rises excessively, the sealing member 3 is removed from the battery case 1 using the internal pressure before the battery case 1 is damaged. Can be dropped. Furthermore, according to the said range of deviation
- the cylindrical battery according to the present invention is useful as a power source for various electronic devices such as portable digital devices.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
図1は、本発明の一実施形態に係る円筒型電池を概念的に示した断面図である。図1に示す様に、円筒型電池は、有底円筒状の電池ケース1と、電解液と共に電池ケース1に収納された電極群2と、電池ケース1の開口部11を封止する円盤状の封口部材3と、電池ケース1の開口部11と封口部材3との間に介在した環状のガスケット4とを備えている。
電池ケース1は、電池ケース1の中心軸1a側へ湾曲又は屈曲した開口端部111と、中心軸1a周りに環状に形成された括れ部112とを有している。この様な電池ケース1は、次の様に作製される。先ず、均一な厚さを持ったステンレス鋼板に深絞り加工を施すことにより、開口端部111に湾曲や屈曲が生じておらず且つ括れ部112のない電池ケース1を成型する。そして、この電池ケース1に電極群2を収納し、その後、電池ケース1に横絞り加工を施すことにより括れ部112を形成する。次に、電池ケース1の開口部11にガスケット4を挿入する。このとき、ガスケット4は、括れ部112によって位置決めされる。それから、電池ケース1に電解液を注入し、その後、ガスケット4の内側に封口部材3を載置した状態で電池ケース1の開口部11に横絞り加工を施すことにより、開口端部111を湾曲又は屈曲させる。その結果として、電池ケース1の開口部11に、ガスケット4を介して封口部材3が嵌め込まれる。即ち、円筒型電池において、開口端部111と括れ部112とによりガスケット4が圧縮され、圧縮されたガスケット4により封口部材3の周縁部31が挟持される。又、圧縮されたガスケット4は、電池ケース1の内面及び封口部材3の周縁部31に密着する。これにより、円筒型電池の密閉性が高められる。
封口部材3は、ステンレス鋼やアルミニウム等の導電性材料から構成されている。又、ガスケット4は、弾性材料から構成されている。弾性材料として、例えば、ポリプロピレン(PP)、ポリエチレン(PE)、ポリフェニレンサルファイド(PPS)、テトラフルオロエチレン-パーフルオロアルキルビニルエーテル共重合体(PFA)、架橋形ゴム等が用いられる。ガスケット4を構成する弾性材料の曲げ弾性率kは、0.4GPa≦k≦1.4GPaを満たしていることが好ましい。
電極群2は、負極板21と、正極板22と、セパレータ23とを有している。電極群2において、負極板21及び正極板22は、これらの間にセパレータ23を介在させた状態で、互いに重ねられると共に巻回されている。電極群2に巻ずれが生じない様に、負極板21及び正極板22の少なくとも何れか一方の巻き終わりの部分が、固定テープにより電極群2の外周面に固定されている。尚、電極群2の構成は、これに限定されるものではない。
本実施形態に係る小型の円筒型電池において、電池ケース1の破損を防止するという意味での安全性と、電解液の漏れを防止するという意味での密閉性とを両立させるためには、以下の条件を満たしていることが好ましい。
1a 中心軸
11 開口部
111 開口端部
111a 先端縁
112 括れ部
12 側壁
13 底部
2 電極群
21 負極板
22 正極板
23 セパレータ
3 封口部材
3a 周縁
31 周縁部
31a 上面
4 ガスケット
51 負極リード
52 正極リード
6 電気絶縁部材
D 外径
T 厚さ
rT 比
k 弾性率
C 仮想平面
L1 第1対応線
L2 第2対応線
d ずれ量
h 距離
R 平均圧縮率
Pv ベント圧
Claims (5)
- 有底円筒状の電池ケースと、
電解液と共に前記電池ケースに収納された電極群と、
前記電池ケースの開口部を封止する円盤状の封口部材と、
前記電池ケースの前記開口部と前記封口部材との間に介在した環状のガスケットと
を備え、
前記電池ケースは、前記電池ケースの中心軸側へ湾曲又は屈曲した開口端部と、前記中心軸周りに環状に形成された括れ部とを有し、前記開口端部と前記括れ部とにより前記ガスケットが圧縮されると共に、圧縮された前記ガスケットにより前記封口部材の周縁部が挟持された、円筒型電池であって、
前記電池ケースの外径は10mm以下であり、
前記中心軸に垂直な仮想平面への前記封口部材の投影像において前記封口部材の周縁に対応する第1対応線と、前記仮想平面への前記開口端部の投影像において前記開口端部の先端縁に対応する第2対応線とを考えた場合、前記第1対応線からの前記中心軸側への前記第2対応線のずれ量dが、-0.1mm≦d≦+0.5mmを満たす、円筒型電池。 - 前記開口端部の先端縁は、前記電池ケースの底部とは反対側へ斜めに向けられている、請求項1に記載の円筒型電池。
- 前記中心軸に沿う方向についての、前記封口部材の前記周縁部の上面から前記開口端部の前記先端縁に対応する位置までの距離zが、0.1mm≦z≦0.3mmを満たす、請求項2に記載の円筒型電池。
- 前記ガスケットの平均圧縮率Rが、10%≦R≦60%を満たす、請求項1~3の何れか1つに記載の円筒型電池。
- 前記電池ケースの外径は6mm以下である、請求項1~4の何れか1つに記載の円筒型電池。
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US15/311,456 US10147967B2 (en) | 2014-07-24 | 2015-06-17 | Cylindrical battery |
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