WO2011114625A1 - 電池パック - Google Patents
電池パック Download PDFInfo
- Publication number
- WO2011114625A1 WO2011114625A1 PCT/JP2011/000980 JP2011000980W WO2011114625A1 WO 2011114625 A1 WO2011114625 A1 WO 2011114625A1 JP 2011000980 W JP2011000980 W JP 2011000980W WO 2011114625 A1 WO2011114625 A1 WO 2011114625A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery pack
- coupling portion
- case
- coupling
- plate
- Prior art date
Links
- 230000008878 coupling Effects 0.000 claims description 130
- 238000010168 coupling process Methods 0.000 claims description 130
- 238000005859 coupling reaction Methods 0.000 claims description 130
- 230000001965 increasing effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 description 17
- 229920005989 resin Polymers 0.000 description 16
- 239000011347 resin Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 238000000465 moulding Methods 0.000 description 10
- 238000005192 partition Methods 0.000 description 9
- 230000001629 suppression Effects 0.000 description 8
- 230000008602 contraction Effects 0.000 description 7
- 238000001746 injection moulding Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000002441 reversible effect Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- -1 nickel metal hydride Chemical class 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
Images
Classifications
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
-
- 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
-
- 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
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
-
- 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 battery pack including a battery and a case for storing the battery, and in particular, includes a plurality of secondary batteries that are electrically connected to each other, and an outer case made of synthetic resin for storing these. It relates to a battery pack.
- the battery pack includes a battery and an outer case that houses the battery so that electric power can be supplied to the outside.
- the battery pack is required to have high quality.
- a battery pack is incorporated in an electronic device such as a notebook computer, high dimensional accuracy is required.
- the exterior case generally includes a top plate, a bottom plate, and a side plate that defines a space between the top plate and the bottom plate.
- the first case includes a top plate and a part of a side plate and has an opening
- the second case includes the bottom plate and the remainder of the side plate and closes the opening of the first case.
- an exterior case is comprised.
- These cases are generally obtained by injection molding a synthetic resin.
- the thickness of the top plate (or bottom plate) and the side plate is usually formed to be equal. Such a case is likely to be deformed such as warpage due to resin shrinkage during molding.
- JP 2008-135342 A JP-A-6-254929 JP 2003-245937
- the present invention suppresses warping by improving the structure of the molded product. Is focused on.
- the present invention is a battery pack including a battery and a case for storing the battery, wherein the case includes a top plate, a bottom plate, and a space between the top plate and the bottom plate.
- a first coupling portion that couples the top plate and the side plate, a second coupling portion that couples the bottom plate and the side plate, and the first coupling portion and
- the battery pack includes at least one of the second coupling portions having a thick portion or a thin portion.
- the thick portion is formed by making a corner of the inner surface of the first coupling portion or the second coupling portion into an arc shape.
- the thick portion is formed by providing a protrusion along a corner of the inner surface of the first coupling portion or the second coupling portion.
- the thick portion may be the thickness of the top plate and the side plate, or the thickness of the bottom plate and the side plate, and may be the first coupling portion or the second coupling. It is formed by gradually increasing the thickness toward the corner of the inner surface of the part.
- the thin portion is formed by providing a groove along a corner of the inner surface of the first coupling portion or the second coupling portion.
- the thin-walled portion may be configured such that the thickness of the top plate and the side plate or the thickness of the bottom plate and the side plate is the first coupling unit or the second coupling unit. It is formed by gradually thinning it toward the corners of the inner surface.
- the thick portion or the thin portion is provided over the entire edge line of the first coupling portion or the second coupling portion.
- the thick portion or the thin portion is partially provided on a ridge line of the first coupling portion or the second coupling portion.
- the thick portion or the thin portion is provided intermittently on the ridge line of the first coupling portion or the second coupling portion.
- the present invention it is possible to provide a battery pack in which deformation such as warping of the case is suppressed regardless of whether or not various conditions during molding are controlled. Therefore, the dimensional accuracy of the battery pack is improved, and the mounting property to the electronic device is improved. Further, since the residual stress of the case can be reduced, it is easy to ensure the mechanical strength of the battery pack. By ensuring the mechanical strength of the battery pack, the safety of the battery pack can be expected to improve when the device is used.
- the present invention relates to a battery pack including a battery and a case (hereinafter referred to as an exterior case) that stores the battery so that electric power can be supplied to the outside.
- the exterior case includes a top plate, a bottom plate, and a side plate that defines a space between the top plate and the bottom plate.
- the shape of the top plate and the bottom plate is not particularly limited, but usually has two main pairs of parallel sides perpendicular to each other and has a rectangular shape or a shape close thereto.
- the side plate normally defines a space between the top plate and the bottom plate so that the distance between the top plate and the bottom plate is constant.
- the exterior case includes, for example, a first case having a top plate and a part of a side plate (hereinafter referred to as a first side portion), an opening, and a remaining portion of the bottom plate and the side plate (hereinafter referred to as a second side portion). And a second case for closing the opening of the first case.
- the end portion of the first side surface portion that defines the outline of the opening of the first case is joined to the end portion of the second side surface portion of the second case.
- the joining method is not particularly limited, but the exterior case is usually made of resin, and thus is joined by welding or an adhesive.
- the top plate and the first side surface portion are usually formed integrally.
- a boundary portion between the bent top plate and the first side surface portion is referred to as a first coupling portion.
- the bottom plate and the second side surface portion are usually formed integrally.
- a boundary portion between the bent bottom plate and the second side surface portion is referred to as a second coupling portion.
- the top plate and the first side surface portion, or the bottom plate and the second side surface portion may not be molded integrally.
- only the first case may have a side plate, and the second case may be configured with only a bottom plate.
- the top plate, the side plate, and the bottom plate are separately formed, and these are joined by welding or an adhesive.
- the first coupling portion and the second coupling portion are joint portions by welding or an adhesive, respectively.
- At least one of the first coupling portion and the second coupling portion has a thick portion or a thin portion. It is desirable that the thick portion or the thin portion is formed in both the first coupling portion and the second coupling portion in that the effect of suppressing deformation of the exterior case is enhanced. However, even if a thick portion or a thin portion is provided in only one of the first coupling portion and the second coupling portion, the effect of suppressing deformation of the exterior case can be obtained to some extent.
- a thick part can be provided in one of the first coupling part and the second coupling part, and a thin part can be provided in the other.
- the thick part or the thin part can be provided so as to extend from the top plate to the side plate or from the bottom plate to the side plate.
- a thick part or a thin part may be provided near the side plate at the boundary between the top plate or the bottom plate and the side plate, or a thick part or near the top plate or the bottom plate at the boundary. You may provide a thin part.
- the shrinkage balance of the resin is improved, and deformation such as warpage is suppressed.
- deformation such as warpage
- the deformation of the outer case is suppressed, the impact resistance of the battery pack is increased, and the safety can be improved. For example, since the residual stress generated at the joint portion between the first case and the second case is reduced, the tearing of the joint portion is suppressed when the battery pack is dropped.
- the thick or thin part is preferably provided on the inner surface side of the outer case. This is because unnecessary irregularities are not formed on the outer surface of the outer case, and the appearance of the outer case is not impaired, and the mounting property to the device is not impaired.
- the thick portion is formed, for example, by making the corner of the inner surface of the first coupling portion or the second coupling portion into an arc shape.
- the corner of the outer surface of the first coupling portion or the second coupling portion may be an arc shape or a pointed shape with a tip having an acute angle or an obtuse angle of 90 degrees.
- the radius of curvature (Rout) of the corners of the outer surface is made smaller (increase the curvature) than the radius of curvature (Rin) of the corners of the inner surface.
- the radius of curvature (Rin) of the arc at the corner of the inner surface is, for example, 0.3 to 1.2 mm.
- the radius of curvature (Rout) is, for example, 0.2 to 0.3 mm.
- the ratio of Rin / Rout is preferably 2.5 or more, more preferably 2.5 to 4.
- an arc corresponding to the radius of the cylindrical battery stored in the outer case can be formed at the corner of the inner surface. By forming such an arc, the gap in the outer case can be reduced.
- the battery can be stored in the outer case with the peripheral surface of the cylindrical battery supported by the inner surface of the thick portion.
- the circular arc refers to an arc formed in a cross section (hereinafter, a main cross section) obtained by cutting the first coupling portion or the second coupling portion perpendicularly to the top plate (or bottom plate) and perpendicular to the side plate. .
- a main cross section obtained by cutting the first coupling portion or the second coupling portion perpendicularly to the top plate (or bottom plate) and perpendicular to the side plate.
- the inner surface of the coupling portion draws a monotonous curve from the top plate (or bottom plate) to the side plate.
- the case where the top plate (or bottom plate) and the side plate have a uniform thickness and the outer surface draws an arc having a dimension obtained by adding the thickness to the radius of the battery to be mounted is excluded.
- the thickness T1 of the top plate and the bottom plate is not particularly limited, but is generally about 0.5 to 1.5 mm from the viewpoint of reducing the size and weight of the battery pack. Further, the thickness T2 of the side plate is generally 0.3 to 1.5 mm.
- the thick portion can also be formed by providing a protrusion along the corner of the inner surface of the first coupling portion or the second coupling portion.
- the cross sectional shape of the protrusion at the corner of the inner surface is not particularly limited. For example, it has a sharp shape that is convex on the inner surface side and the tip is 90 degrees, an acute angle or an obtuse angle, or an arc shape that is convex on the inner surface side.
- the relationship between the distance (Tcs) from the corner of the outer surface to the tip of the ridge, the thickness T1 of the top plate (or bottom plate), and the thickness T2 of the side plate is, for example, 1.5 ⁇ T1 ⁇ Tcs ⁇ 2 ⁇ T1 and 1.5 ⁇ T2 ⁇ Tcs ⁇ 2 ⁇ T2.
- Tcs distance from the corner of the outer surface to the tip of the ridge
- T1 of the top plate (or bottom plate) the thickness T2 of the side plate
- the thickness of the top plate and the side plate, or the thickness of the bottom plate and the side plate is gradually increased toward the corner of the inner surface of the first coupling part or the second coupling part.
- the thickness of the thickest portion of the first coupling portion or the second coupling portion (tmax: distance from the corner of the outer surface to the corner of the inner surface) is 1.5. It is preferable to satisfy ⁇ T1 ⁇ tmax ⁇ 2 ⁇ T1 and 1.5 ⁇ T2 ⁇ tmax ⁇ 2 ⁇ T2.
- the thin portion is formed, for example, by providing a groove along the corner of the inner surface of the first coupling portion or the second coupling portion.
- the cross-sectional shape of the groove is not particularly limited, but, for example, a convex shape on the outer surface side and an acute or obtuse tip shape, a convex arc shape on the outer surface side, a bottom surface parallel to the top plate (or bottom plate) Or a shape having a bottom surface parallel to the side plate.
- the thickness T1 of the top plate (or bottom plate), and the thickness T2 of the side plate is, for example, 0 .5 ⁇ T1 ⁇ D ⁇ 0.8 ⁇ T1 and 0.5 ⁇ T2 ⁇ D ⁇ 0.8 ⁇ T2. If it is this range, in addition to becoming easy to form the thin part sufficient to suppress the curvature of an exterior case, sufficient intensity
- strength of an exterior case can be ensured.
- the thin-walled portion is also formed by gradually reducing the thickness of the top plate and the side plate or the thickness of the bottom plate and the side plate toward the corner of the inner surface of the first coupling portion or the second coupling portion. It can also be formed. For example, it is preferable to change the thickness at a rate of 30 to 160 ⁇ m per mm in a range where the distance L from the corner of the outer surface is within 3 mm. Thus, it is thought that the effect of the stress relaxation which suppresses the curvature of an exterior case is heightened by changing thickness gradually.
- the thickness (tmin) of the thinnest portion of the first coupling portion or the second coupling portion is 0.5 ⁇ T1 ⁇ tmin ⁇ 0.8 ⁇ T1, and 0 It is preferable to satisfy .5 ⁇ T2 ⁇ tmin ⁇ 0.8 ⁇ T2.
- the thick part and the thin part as described above can be provided in the first case and the second case in any combination.
- an arc-shaped thick part is provided in the first case
- a thick part of a protrusion is provided in the second case
- a thin part including a groove having a bottom surface parallel to the top plate is provided in the first case. It is also possible to provide a thick part of the ridge on the two cases.
- the thick portion or the thin portion may be provided over the entire ridge line of the first coupling portion or the second coupling portion, or may be partially provided. However, it is preferable that the partial thick portion or the thin portion is provided at a target position of parallel sides (ridge lines) facing each other. In particular, the thick or thin portion is preferably provided intermittently along the ridge line of the first coupling portion or the second coupling portion. At this time, it is preferable that the interval between adjacent thick portions or thin portions be equal intervals within one side (ridge line). Thus, it is thought that the effect which relieve
- the length per one of the thick or thin portions provided intermittently (Ln) ) Preferably satisfies 0.04 ⁇ L0 ⁇ Ln ⁇ 0.2 ⁇ L0, for example.
- the total length (LN) of the portion where the thick portion or the thin portion is provided is preferably 60 to 70% of L0.
- the battery pack of the present invention is not limited to a notebook personal computer, and the structure is not limited by the following drawings.
- the present invention can be applied to battery packs for various uses such as digital still cameras, portable music players, small devices such as mobile phones, electric tools, electric bicycles, electric vehicles, and hybrid vehicles.
- the battery pack 10 includes a first case 101 having a rectangular top plate 11 and a first side surface portion 13a extending perpendicularly from the four sides thereof, and a second case having a bottom plate 15 and a second side surface portion 13b extending from the four sides thereof. 103.
- the end portion of the first side surface portion 13a defines the outline of the opening of the first case 101.
- the end portion of the second side surface portion 13b that defines the contour of the opening of the second case 103 is mated and joined. .
- the 1st side part 13a and the 2nd side part 13b are united, and comprise the side plate 13 which prescribes
- a plurality of batteries 12 are housed in the exterior case so that power can be supplied to the outside. Specifically, a group of three batteries 12 connected in series is set as one set, and two sets of battery groups are connected in parallel via leads 14a and 14b and arranged side by side.
- a battery pack composed of a total of six batteries 12 is partitioned by a central partition plate 16a that partitions between two sets of battery groups, and an auxiliary partition plate 16b that partitions the front and rear of the batteries 12 connected in series. By these partition plates, the movement of the battery 12 inside the outer case is suppressed, and the connection between the batteries is stably maintained.
- the above is merely an example of the battery storage form, and the number of batteries and how to connect the batteries. Is not particularly limited. Further, the central partition plate and the auxiliary partition plate are not essential.
- the battery 12 may be a primary battery or a secondary battery, but a secondary battery is generally used.
- the secondary battery include a lithium ion battery, a nickel metal hydride storage battery, and a nickel cadmium storage battery.
- the use of lithium ion batteries has become the mainstream because high capacity and high output can be obtained.
- the top plate 11 and the first side surface portion 13a are integrally molded, and these boundary portions of the bent shape become the first coupling portion 17a.
- the bottom plate 15 and the second side surface portion 13b are formed integrally, and these boundary portions of the bent shape become the second coupling portion 17b.
- bond part 17b is shown in FIG. 3 in the state which notched a part of case of the battery pack. However, in FIG. 3, illustration of the battery 12 accommodated in the exterior case is omitted.
- each of the first coupling portion 17a and the second coupling portion 17b has a thick portion 19 formed by making the corners of the inner surfaces arc-shaped (R-shaped).
- the corners of the outer surface may be pointed as shown in FIG. 3, but may be arcuate.
- the thick portion 19 is formed by making the corners of the inner surfaces of the first coupling portion 17a and the second coupling portion 17b into arc shapes, a portion protruding to the outer surface side of the exterior case does not occur, The appearance of the battery pack and the mountability to the device are not impaired. Furthermore, the mechanical strength of the first coupling portion 17a and the second coupling portion 17b is also improved.
- a circuit board (not shown) having a protection circuit for protecting the battery 12 from overcharge and overdischarge can be accommodated in the exterior case.
- a circuit board has a plurality of internal terminals, and the internal terminals are connected to the leads 14a and 14b.
- the circuit board is connected to a connector 18 for mounting the battery pack on a device such as a notebook computer. Power supply (discharge) from the battery to the notebook computer and charging of the battery by an external power source are performed via the connector 18.
- the thick portion may be provided over the entire ridgeline of the first coupling portion 17a and the second coupling portion 17b, and as shown in FIG. 4, a predetermined length (for example, partially provided along the ridgeline) It may be a thick portion 19x having a length of 20 to 40 mm. Also, as shown in FIG. 5, short (for example, 15 to 20 mm long) thick portions 19y may be intermittently provided at a plurality of locations along the ridgeline, for example, at regular intervals.
- an arc having a radius of curvature (Rin) corresponding to the radius of the battery accommodated in the outer case may be formed at the corner of the inner surface of each coupling portion.
- the first case and the second case are warped outwardly (case 101A) as shown in FIG. Or reverse warping (case 101B) that protrudes inward may occur as shown in FIG.
- Such warping is considered to occur because stress due to resin shrinkage or the like remains in the first joint portion between the top plate and the side plate or the second joint portion between the bottom plate and the side plate.
- the thick part it is considered that the degree of generation of stress due to shrinkage when the molten resin is cooled and solidified tends to be uniform, and such warpage is reduced.
- the thin portion similarly, it is considered that the degree of generation of stress due to shrinkage when the molten resin is cooled and solidified is likely to be uniform, and warpage is reduced.
- the warp or reverse warp as described above tends to increase as a case having a shape in which the shrinkage balance of the resin tends to be uneven is formed. For example, when the tensile stress due to the contraction of the side plate becomes larger than the tensile stress due to the contraction of the top surface plate or the bottom surface plate, a warp that protrudes outward is likely to occur. Further, when the tensile stress due to the contraction of the side plate is smaller than the tensile stress due to the contraction of the top surface plate or the bottom surface plate, warping that is convex inward tends to occur.
- the first case 101 and the second case 103 can be obtained by injection-molding a composition mainly composed of a synthetic resin, for example, a thermoplastic resin, using a predetermined mold.
- the method of injection molding is not particularly limited, but from the viewpoint of enhancing the effect of suppressing the warping of the outer case, the mold temperature during molding and the pressure in the mold may be controlled as conventionally.
- thermoplastic resin examples include polyolefins such as polypropylene, polyesters such as polycarbonate, polyethylene terephthalate, and polybutylene terephthalate, polyamides, and liquid crystal polymers.
- additives such as an inorganic filler and a flame retardant, can be contained in the resin composition.
- a mold used for injection molding is usually composed of a female mold having a concave portion with a predetermined shape and a male mold having a convex portion fitted with the concave portion at a predetermined interval, and is formed between the concave portion and the convex portion. The interval becomes a cavity for injecting resin.
- the mold is provided with a sprue, a runner and a gate.
- the molten resin is injected from the injection nozzle into the closed mold. Resin is introduced into the cavity through the sprue, runner and gate.
- the mold is opened. Normally, such a series of operations is controlled by a predetermined control device.
- ⁇ ⁇ ⁇ ⁇ Take out the molded case from the opened mold. After that, a partition plate, a circuit board, a connector, etc. are attached to the first case or the second case, the batteries and leads are assembled, and the opening ends of the first case and the second case are butted together and joined, A battery pack is obtained.
- the thick portion 19A of the battery pack 10A of FIG. 8 is formed by providing protrusions 80 along the corners of the inner surfaces of the first coupling portion 17a and the second coupling portion 17b.
- the cross-sectional shape of the protrusion is convex toward the inner surface, and the tip 83 is a sharp shape with an angle of about 90 degrees.
- the thick portion 19B of the battery pack 10B in FIG. 9 gradually increases the thickness of the top plate and the side plate toward the corner of the inner surface of the first coupling portion, and the thickness of the bottom plate and the side plate to the second. It is formed by gradually increasing the thickness toward the corner of the inner surface of the coupling portion.
- the thicknesses of the top plate, the bottom plate, and the side plate increase at a constant rate up to the vicinity of the corners of each coupling portion, and the corner cross-section has an arc shape.
- the top plate (or bottom plate) and the inner surface of the side plate are more inclined toward the inner surface, and the outer surface of each portion is flat.
- the height is constant.
- the thin portion 19C of the battery pack 10C of FIG. 10 is provided by providing a groove 100 having a convex arcuate depth D1 on the outer surface side along the corners of the inner surfaces of the first coupling portion 17a and the second coupling portion 17b. Is formed.
- the thin-walled portion may be provided over the entire ridgeline of the first coupling portion 17a and the second coupling portion 17b, and as shown in FIG. 11, a predetermined length (for example, a long length) provided partially along the ridgeline. 20 to 40 mm) may be used.
- a predetermined length for example, a long length
- 20 to 40 mm may be used.
- short (for example, 15 to 20 mm long) thin portions 19w may be provided intermittently at a plurality of locations along the ridgeline, for example, at regular intervals.
- the relationship between the width W of the bottom surface 150 of the groove 130, the top plate (or bottom plate) thickness T1, and the side plate thickness T2 is, for example, 0.5 ⁇ T1 ⁇ W ⁇ 1 ⁇ T1, and 0. 5 ⁇ T2 ⁇ W ⁇ 1 ⁇ T2.
- a groove having a bottom surface parallel to the top plate or the bottom plate is provided instead of the groove having a bottom surface parallel to the side plate.
- the thin portion 19E of the battery pack 10E in FIG. 14 gradually reduces the thickness of the top plate and the side plate toward the corner of the inner surface of the first coupling portion, and the second coupling of the thickness of the bottom plate and the side plate. It is formed by gradually thinning toward the corner of the inner surface of the part.
- the thicknesses of the top plate, the bottom plate, and the side plates are reduced at a constant rate up to the vicinity of the corners of each coupling portion, and the corner cross section has an arc shape with a large curvature.
- the top plate (or bottom plate) and the inner surface of the side plate are inclined toward the outer surface side, and the outer surface of each portion is flat, so the thickness of the outer shape of the battery pack Is constant.
- a battery pack having an outer case with outer dimensions as shown in FIGS. 1 to 3 having a length of 200 mm in the longitudinal direction, a length of 40 mm in the width direction and a height of 20 mm was produced.
- a polycarbonate added with a flame retardant as a thermoplastic resin was used, and injection molding was performed with a predetermined mold to mold a first case and a second case having substantially vertical shapes.
- a series of injection molding operations were controlled by a predetermined control device.
- a partition plate, a circuit board, a connector, and the like were attached to the obtained case, and as shown in FIG. 1, two sets of battery groups composed of three batteries connected in series were connected in parallel and incorporated in the case. Thereafter, the opening ends of the first case and the second case were butted together and joined with an adhesive.
- the thickness of the top and bottom plates of the exterior case was 1 mm, and the thickness of the side plates was 1 mm.
- the corners of the inner surface of the first coupling part or the second coupling part of each case were arc-shaped, and the corners of the outer surface were arc-shaped with a small radius of curvature to form a thick part.
- the radius of curvature (Rin) at the corner of the inner surface was 1 mm, and the radius of curvature (Rout) at the corner of the outer surface was 0.3 mm.
- the thick part was formed along the whole ridgeline (namely, the whole periphery of a top
- the thick portion is formed along the entire ridgeline of each coupling portion by providing a protrusion along the corner of the inner surface of the first coupling portion or the second coupling portion of each case.
- a battery pack was produced in the same manner as Example 1 except for the above.
- the cross-sectional shape of the ridge was a sharp shape that was convex on the inner surface side and the tip formed an angle of 90 degrees.
- the distance (Tcs) from the corner of the outer surface to the tip of the ridge was 2.8 mm.
- the thickness of the top plate and the side plate and the thickness of the bottom plate and the side plate are gradually increased toward the corners of the inner surface of the first coupling portion or the second coupling portion.
- a battery pack was produced in the same manner as in Example 1 except that the thick portion was formed along the entire ridge line of the first coupling portion or the second coupling portion of each case.
- the thickness (tmax) of the thickest part of each joint was 2.8 mm.
- the thickness was gradually changed at a constant rate from 1 mm in the range where the distance L from the corner of the outer surface was within 3 mm.
- Example 1 As shown in FIG. 4, except that the thick-walled portion (20 mm in length) whose inner corner is arc-shaped is partially provided on both end portions of the long side surface along the ridge line of each connecting portion. As in Example 1, a battery pack was produced.
- a battery pack was produced in the same manner as in Example 1.
- Comparative Example 2 A battery pack was produced in the same manner as in Comparative Example 1, except that the thickness of the top plate and the bottom plate of the outer case was 1 mm and the thickness of the side plate was 0.3 mm.
- the amount of warpage of the top plate of the exterior cases of Examples 1 to 5 and Comparative Examples 1 and 2 was measured using a pick tester. Specifically, the height difference between the uppermost part and the lowermost part of the top plate was defined as the amount of warpage.
- Examples 4 to 5 show that the effect of suppressing warpage varies depending on the installation method of the thick portion, and that it is possible to significantly suppress warpage compared to Comparative Examples 1 and 2 even by providing a slight thickness portion. Yes.
- the thickness of the top plate and the bottom plate of the outer case is 1.5 mm, and as shown in FIG. 10, the arcuate depth D1 along the corner of the inner surface of the first coupling portion or the second coupling portion of each case.
- a battery pack was produced in the same manner as in Example 1 except that a thin-walled portion was formed along the entire ridgeline of each connecting portion by providing a groove of 0.5 mm.
- a groove having a bottom surface parallel to the side plate and having a depth D2 of 0.2 mm and a width W of 1 mm is formed.
- the thickness of the top plate and the side plate and the thickness of the bottom plate and the side plate are gradually reduced toward the corner of the inner surface of the first coupling portion or the second coupling portion.
- a battery pack was produced in the same manner as in Example 6 except that the thin portion was formed along the entire ridge line of the first coupling portion or the second coupling portion of each case.
- the thickness (tmin) of the thinnest part of each coupling part was 0.3 mm.
- the thickness was gradually changed from a thickness of 1 mm or 1.5 mm at a constant rate within a range where the distance L from the corner of the outer surface was within 3 mm.
- a battery pack was produced in the same manner as in Example 6 except that arc-shaped grooves (20 mm in length) were provided on both ends of the long side surface along the ridge line of each coupling portion. did.
- arc-like grooves (20 mm in length) are the same as those in Example 6 except that the grooves are intermittently provided at a plurality of locations at equal intervals (interval of 25 mm) along the ridgeline of each connecting portion.
- a battery pack was prepared.
- Examples 9 to 10 show that the effect of warpage suppression varies depending on the installation method of the thin-walled portion, and also shows that warpage can be remarkably suppressed as compared with Comparative Examples 1 and 2 just by providing a slight thin-walled portion.
- the present invention it is possible to provide a battery pack in which deformation such as warping of the case is suppressed regardless of whether or not various conditions during molding are controlled. Therefore, it is useful as a battery pack attached to a device that requires high quality, such as a notebook computer.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
外面の隅が円弧状である場合、その曲率半径(Rout)は、例えば0.2~0.3mmである。Rin/Routの比は2.5以上、更には2.5~4であることが好ましい。このようにすることで、ケースの反りを抑制するのに十分な肉厚部を形成することが容易となる。
なお、上記は電池の収納形態の一例に過ぎず、電池の数や接続の仕方は特に限定されない。また、中央仕切板および補助仕切板は、必須ではない。
第1ケース101および第2ケース103は、それぞれ合成樹脂、例えば熱可塑性樹脂を主成分とする組成物を、所定の金型を用いて射出成形することにより得ることができる。射出成形の方法は、特に限定されないが、外装ケースの反りを抑制する効果を高める観点から、従来のように、成形時の金型温度や金型内の圧力を制御してもよい。
図8の電池パック10Aの肉厚部19Aは、第1結合部17aおよび第2結合部17bの内面の隅に沿って、突条80を設けることにより形成されている。要部断面において、突条の断面形状は、内面側に凸であり、先端83が約90度の角度を成す尖った形状である。このような肉厚部を形成することにより、図3に示した肉厚部と同様の、反りの抑制、外装ケースの機械的強度の向上などの効果を得ることができ、かつ、より高い機械的強度を得ることが可能である。
図10の電池パック10Cの薄肉部19Cは、第1結合部17aおよび第2結合部17bの内面の隅に沿って、外面側に凸の円弧状の深さD1を有する溝100を設けることにより形成されている。このような薄肉部を形成することにより、図3に示した肉厚部と同様の、反りの抑制、外装ケースの機械的強度の向上などの効果を得ることができる。
次に、薄肉部の他の形態について説明する。
図13の電池パック10Dの薄肉部19Dは、第1結合部および第2結合部の内面の隅に沿って、側面板に平行な底面150を有する深さD2の溝130を設けることにより形成されている。このような薄肉部を形成することにより、図10に示した薄肉部と同様の、反りの抑制、外装ケースの機械的強度の向上などの効果を得ることが可能である。溝130の底面150の幅Wと、天面板(または底面板)の厚さT1と、側面板の厚さT2との関係は、例えば0.5×T1≦W≦1×T1、かつ0.5×T2≦W≦1×T2である。このことは、側面板に平行な底面を有する溝の代わりに、天面板または底面板に平行な底面を有する溝を設ける場合についても同様である。
外装ケースの天面板および底面板の厚さを1mmとし、図15に示すように、内面の隅の曲率半径を外面の隅と同じとし、各ケースの第1結合部または第2結合部に肉厚部を全く設けなかったこと以外、実施例1と同様に、電池パック10Fを作製した。
外装ケースの天面板および底面板の厚さを1mmとし、側面板の厚さを0.3mmとしたこと以外、比較例1と同様に、電池パックを作製した。
11 天面板
12 電池
13 側面板
13a 第1側面部
13b 第2側面部
15 底面板
17a 第1結合部
17b 第2結合部
18 コネクタ
19、19A、19B 肉厚部
19C、19D、19E 薄肉部
101 第1ケース
103 第2ケース
Claims (9)
- 電池と、前記電池を収納するケースと、を備えた電池パックであって、
前記ケースが、天面板と、底面板と、前記天面板と前記底面板との間の空間を規定する側面板と、前記天面板と前記側面板とを結合する第1結合部と、前記底面板と前記側面板とを結合する第2結合部と、を具備し、
前記第1結合部および前記第2結合部の少なくとも一方が、肉厚部または薄肉部を有する、電池パック。 - 前記肉厚部が、前記第1結合部または前記第2結合部の内面の隅を、円弧状にすることにより形成される、請求項1記載の電池パック。
- 前記肉厚部が、前記第1結合部または前記第2結合部の内面の隅に沿って、突条を設けることにより形成される、請求項1記載の電池パック。
- 前記肉厚部が、前記天面板と前記側面板の厚さ、または、前記底面板と前記側面板の厚さを、前記第1結合部または前記第2結合部の内面の隅に向かって、徐々に厚くすることにより形成される、請求項1記載の電池パック。
- 前記薄肉部が、前記第1結合部または前記第2結合部の内面の隅に沿って、溝を設けることにより形成される、請求項1記載の電池パック。
- 前記薄肉部が、前記天面板と前記側面板の厚さ、または、前記底面板と前記側面板の厚さを、前記第1結合部または前記第2結合部の内面の隅に向かって、徐々に薄くすることにより形成される、請求項1記載の電池パック。
- 前記肉厚部または前記薄肉部が、第1結合部または第2結合部の稜線の全体にわたって設けられている、請求項1~6のいずれか1項に記載の電池パック。
- 前記肉厚部または前記薄肉部が、第1結合部または第2結合部の稜線に部分的に設けられている、請求項1~6のいずれか1項に記載の電池パック。
- 前記肉厚部または前記薄肉部が、第1結合部または第2結合部の稜線に間欠的に設けられている、請求項1~6のいずれか1項に記載の電池パック。
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JP2012505471A JPWO2011114625A1 (ja) | 2010-03-15 | 2011-02-22 | 電池パック |
US13/508,526 US20120225339A1 (en) | 2010-03-15 | 2011-02-22 | Battery pack |
KR2020127000027U KR20120005262U (ko) | 2010-03-15 | 2011-02-22 | 전지 팩 |
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JP2010-057065 | 2010-03-15 | ||
JP2010057065 | 2010-03-15 |
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WO2011114625A1 true WO2011114625A1 (ja) | 2011-09-22 |
Family
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PCT/JP2011/000980 WO2011114625A1 (ja) | 2010-03-15 | 2011-02-22 | 電池パック |
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US (1) | US20120225339A1 (ja) |
JP (1) | JPWO2011114625A1 (ja) |
KR (1) | KR20120005262U (ja) |
WO (1) | WO2011114625A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016013150A1 (ja) * | 2014-07-22 | 2016-01-28 | パナソニックIpマネジメント株式会社 | 電池モジュール |
JP2018120865A (ja) * | 2012-12-21 | 2018-08-02 | 三星エスディアイ株式会社Samsung SDI Co., Ltd. | バッテリーパック |
JP2022520013A (ja) * | 2019-11-25 | 2022-03-28 | エルジー エナジー ソリューション リミテッド | 電池モジュールおよびこれを含む電池パック |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103683905A (zh) * | 2012-09-07 | 2014-03-26 | 鸿富锦精密工业(深圳)有限公司 | 电压转换器 |
JP7212636B2 (ja) * | 2018-01-31 | 2023-01-25 | 三洋電機株式会社 | 電池パック |
EP3748716A4 (en) * | 2018-01-31 | 2021-04-07 | SANYO Electric Co., Ltd. | BATTERY PACK |
CN114041196B (zh) * | 2019-08-08 | 2023-08-15 | 株式会社村田制作所 | 薄膜电容器以及薄膜电容器用的外装壳体 |
CN118412607A (zh) * | 2024-06-24 | 2024-07-30 | 浙江晶科储能有限公司 | 电池包 |
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JP2000077048A (ja) * | 1998-09-01 | 2000-03-14 | Matsushita Electric Ind Co Ltd | パック電池 |
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US4430370A (en) * | 1981-05-05 | 1984-02-07 | General Electric Company | Thermoplastic molded part with stress reducing juncture |
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2011
- 2011-02-22 JP JP2012505471A patent/JPWO2011114625A1/ja active Pending
- 2011-02-22 US US13/508,526 patent/US20120225339A1/en not_active Abandoned
- 2011-02-22 KR KR2020127000027U patent/KR20120005262U/ko not_active Application Discontinuation
- 2011-02-22 WO PCT/JP2011/000980 patent/WO2011114625A1/ja active Application Filing
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JPH0615703A (ja) * | 1991-12-19 | 1994-01-25 | Mitsubishi Gas Chem Co Inc | 変形の少ない成形品 |
JPH071495A (ja) * | 1993-06-16 | 1995-01-06 | Kansei Corp | 射出成形品 |
JPH07314482A (ja) * | 1994-05-27 | 1995-12-05 | Dainippon Printing Co Ltd | 樹脂成形体 |
JP2000077048A (ja) * | 1998-09-01 | 2000-03-14 | Matsushita Electric Ind Co Ltd | パック電池 |
JP2008135342A (ja) * | 2006-11-29 | 2008-06-12 | Sony Corp | 電池パック |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2018120865A (ja) * | 2012-12-21 | 2018-08-02 | 三星エスディアイ株式会社Samsung SDI Co., Ltd. | バッテリーパック |
WO2016013150A1 (ja) * | 2014-07-22 | 2016-01-28 | パナソニックIpマネジメント株式会社 | 電池モジュール |
JPWO2016013150A1 (ja) * | 2014-07-22 | 2017-04-27 | パナソニックIpマネジメント株式会社 | 電池モジュール |
JP2022520013A (ja) * | 2019-11-25 | 2022-03-28 | エルジー エナジー ソリューション リミテッド | 電池モジュールおよびこれを含む電池パック |
JP7278392B2 (ja) | 2019-11-25 | 2023-05-19 | エルジー エナジー ソリューション リミテッド | 電池モジュールおよびこれを含む電池パック |
Also Published As
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JPWO2011114625A1 (ja) | 2013-06-27 |
KR20120005262U (ko) | 2012-07-18 |
US20120225339A1 (en) | 2012-09-06 |
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