WO2011048782A1 - 二次電池 - Google Patents
二次電池 Download PDFInfo
- Publication number
- WO2011048782A1 WO2011048782A1 PCT/JP2010/006122 JP2010006122W WO2011048782A1 WO 2011048782 A1 WO2011048782 A1 WO 2011048782A1 JP 2010006122 W JP2010006122 W JP 2010006122W WO 2011048782 A1 WO2011048782 A1 WO 2011048782A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pair
- thin
- secondary battery
- side walls
- battery case
- Prior art date
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
-
- 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
- H01M50/112—Monobloc comprising multiple compartments
- H01M50/114—Monobloc comprising multiple compartments specially adapted for lead-acid cells
-
- 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 secondary battery, such as a lead-acid battery, having a structure for suppressing battery fragments and electrolyte dispersion.
- Secondary batteries such as lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and lithium-ion batteries can be used repeatedly by charging, so they are widely used in automotive power supplies, portable electronic device power supplies, and power storage equipment power supplies. ing. As the versatility of the secondary battery increases, misuse such as overcharging or overdischarging the secondary battery or reverse connection increases. If such a secondary battery is misused, depending on the type of the secondary battery, the electrolyte may leak or the battery may burst.
- lithium ion secondary batteries used particularly as power sources for portable electronic devices are often used as battery packs in which one or more batteries are housed in a case.
- the shape and capacity of the battery pack is determined as a power supply device for one type of load device. Therefore, the operation of the charging device can be optimized in accordance with the characteristics of the battery pack, and a mechanism for reliably preventing overcharge and overdischarge can be incorporated. Moreover, reverse connection can also be prevented by prescribing the direction and posture that can be attached to the load device by the shape of the battery pack.
- lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and the like are not used in a mode specialized for power equipment for one type of load equipment, but may be used as power equipment for various equipment. Many. Therefore, in order to avoid misuse such as overcharge and reverse connection in these secondary batteries, it is necessary to rely on a method of calling attention by clearly indicating the charge method and use method on the battery case.
- a combustible gas for example, hydrogen gas
- a combustible gas for example, hydrogen gas
- the flammable gas filled in the battery case ignites for some reason, the internal pressure of the battery case suddenly increases and the battery case may be damaged.
- Patent Document 1 attempts to suppress scattering of the electrolytic solution and fragments by providing a groove-like thin portion on the lid of the battery case of the lead storage battery.
- Patent Document 2 the thin-walled portion is provided at an offset position on the opposite side wall of the battery case.
- Patent Document 3 the upper surface of the lid of the battery case is covered with a plastic cover.
- the inside of the battery case may be divided into several chambers.
- a thin part like Patent Document 1 or 2 is provided on the lid or side wall of the battery case, the combustible gas is ignited inside one chamber, and the internal pressure of the one chamber increases.
- the thin portion is broken, the portion surrounding the other chamber of the thin portion may be broken at the same time.
- the electrolyte solution flows out from the chamber where the internal pressure does not rapidly increase, and fragments are scattered.
- Patent Document 3 when the lid of the battery case of the secondary battery is covered with a cover such as a plastic plate material, connection of a power cable or the like to the electrode terminal often provided on the lid of the battery case is made. There are inconveniences such as difficulty and complicated work of replenishing the electrolyte. Further, since the battery case is broken not only at the lid but also at the side, it is not possible to sufficiently suppress the scattering of the electrolytic solution and the fragments simply by covering the cover of the battery case.
- the present invention has been made in view of the above problems, and when the battery case of a secondary battery is damaged due to an increase in internal pressure, the battery case is prevented from being damaged extensively, and fragments and electrolysis are prevented.
- the purpose is to suppress the scattering of the liquid.
- One aspect of the present invention includes an electrode group having a positive electrode, a negative electrode, and a separator, an electrolytic solution, a housing portion that houses the electrode group and the electrolytic solution, and a lid that seals the opening of the housing portion.
- a rechargeable battery comprising: The battery case has a liquid holding part that holds the electrolytic solution inside and below the liquid level of the electrolytic solution, and a gas holding part that holds gas inside and above the liquid level of the electrolytic solution, The gas holding part relates to a secondary battery including a thin part.
- the present invention when the case of the secondary battery is damaged due to an increase in internal pressure, it is possible to prevent the case from being damaged in a wide range and to suppress scattering of fragments and electrolyte.
- FIG. 3 is a partially cutaway perspective view showing the internal structure of the secondary battery according to Embodiments 1 and 2.
- 3 is an enlarged cross-sectional view of a thin portion of the secondary battery according to Embodiment 1.
- FIG. 4 is an enlarged cross-sectional view of a thin portion of a secondary battery according to Embodiment 3.
- FIG. 6 is an enlarged cross-sectional view showing a state where a thin portion of a secondary battery according to Embodiment 3 is broken.
- FIG. 9 is an enlarged cross-sectional view showing a state where a thin portion of a secondary battery according to a modification of Embodiment 3 is broken.
- FIG. 6 is an enlarged cross-sectional view of a thin portion of a secondary battery according to Embodiment 4.
- FIG. 6 is an enlarged cross-sectional view of a thin portion of a secondary battery according to Embodiment 5.
- FIG. 10 is an enlarged cross-sectional view showing a state where a thin portion of a secondary battery according to a modification of Embodiment 5 is broken. It is a perspective view which shows the external appearance of the secondary battery which concerns on Embodiment 6 of this invention.
- FIG. 10 is a perspective view showing a part of the internal structure of the secondary battery according to Embodiment 6 with a part cut away. It is a perspective view which shows the external appearance of the secondary battery which concerns on Embodiment 7 of this invention.
- FIG. 10 is a partially cutaway perspective view showing an internal structure of a secondary battery according to Embodiment 9.
- FIG. 17 is an enlarged cross-sectional view of FIG. 10 is an enlarged cross-sectional view of a thin portion of a secondary battery according to Embodiment 9.
- FIG. 17 is an enlarged cross-sectional view of FIG. 10 is an enlarged cross-sectional view of a thin portion of a secondary battery according to Embodiment 9.
- the present invention includes an electrode group having a positive electrode, a negative electrode, and a separator, an electrolytic solution, a housing portion having an opening for housing the electrode group and the electrolytic solution, and a lid for sealing the opening of the housing portion.
- a secondary battery including the tank.
- the battery case includes a liquid holding unit that holds the electrolytic solution therein below the liquid level of the electrolytic solution, and a gas holding unit that holds gas therein above the liquid level of the electrolytic solution. And a gas holding part contains a thin part.
- the gas holding part of the battery case is a part where flammable gas generated due to misuse of the secondary battery such as overcharge or reverse connection is accumulated. Therefore, by providing a thin part in the gas holding part, the flammable gas filled in the battery case for some reason ignites and the internal pressure suddenly rises, the thin part of the gas holding part is Break early. Thereby, damage to the liquid holding part is suppressed. Therefore, it is possible to prevent the generation of large pieces and to suppress the scattering of the electrolytic solution.
- the interior of the battery case is divided into a plurality of chambers by at least one partition wall, and each of the plurality of chambers contains an electrode group and an electrolytic solution.
- the thin part is independently formed in the gas holding
- the flammable gas is ignited inside one of the chambers, and the internal pressure of the chamber rapidly increases. Even in such a case, it is possible to avoid the partition wall from being damaged by breaking the thin portion of the chamber at an early stage. Therefore, the combustible gas inside each chamber is ignited one after another, and the battery case can be prevented from being damaged on a large scale. Therefore, scattering of electrolyte solution and a fragment can be suppressed more effectively.
- the accommodating portion includes a substantially rectangular bottom having a pair of long sides and a pair of short sides, a pair of opposed short side walls rising from the pair of short sides of the bottom, and the above And side portions having a pair of opposed longitudinal side walls rising from a pair of long sides at the bottom.
- the at least one partition wall has a plate shape substantially parallel to the pair of short side walls.
- the thin portion is formed in a staggered arrangement with respect to the longitudinal side wall or the lid.
- Each of the plurality of chambers has a rectangular parallelepiped shape, a pair of opposed end faces are defined by a pair of longitudinal side walls, and the other pair of opposed end faces are defined by a bottom portion and a lid.
- the inside of the battery case is generally divided into a plurality of chambers, and each room is often divided by a plurality of partition walls perpendicular to the longitudinal direction of the battery case.
- each room is often divided by a plurality of partition walls perpendicular to the longitudinal direction of the battery case.
- the thin portions of each chamber are arranged side by side on one longitudinal side wall, the interval between the thin portions of each chamber is small, so if one thin portion breaks, this leads to the adjacent thin portion. It is conceivable that the skin will break.
- the thin-walled portions of the respective chambers are provided in a staggered arrangement (or zigzag) instead of being arranged in a row with respect to the lid or the side portion.
- the interval between the thin portion and the adjacent thin portion can be made larger than when the thin portions are arranged in a line. Therefore, when one thin part breaks, it can prevent that another thin part breaks by the influence. Thereby, scattering of electrolyte solution and a fragment can be suppressed. Moreover, the strength of the battery case is also improved.
- the interval between the thin wall portions can be made at least larger than the thickness of each chamber.
- the thin wall portions are provided in the zigzag arrangement on the side of the battery case, it is conceivable that the thin wall portions are provided in a staggered arrangement on one of the pair of longitudinal side walls by changing the vertical position of each thin wall portion. . Even in this configuration, the interval between the thin portions can be increased to some extent.
- one of the thin-walled portions of the two adjacent chambers is provided near one of the pair of longitudinal side walls, and the thin-walled portions of the two adjacent chambers It is conceivable to provide the other side of the lid near the other of the pair of longitudinal side walls.
- the thin portion is a substantially rectangular shape having an upper end and a lower end, a first groove is provided along the upper end, and a second groove is provided along the lower end.
- the second groove is deeper than the first groove.
- the second groove is deeper than the first groove, the lower end of the thin portion provided with the second groove is easier to break than the upper end.
- the lower end of the thin-walled portion breaks earlier than the upper end, thereby increasing the possibility that the upper end remains without being broken.
- the ejection direction when gas is ejected from the inside of the battery case to the outside is obliquely downward.
- the jet direction becomes diagonally downward. Therefore, it is possible to prevent the electrolytic solution from being scattered in a wide range.
- the thin portion is formed by providing a recess on the outer surface of the gas holding portion. And the protective material which protects a thin part is arrange
- the strength of that part becomes smaller than the strength of other parts. Therefore, when a thin part collides with other members made of metal, for example, the possibility that the battery case is damaged becomes larger than when other parts collide. Therefore, it can be said that by providing a thin portion in the battery case, the battery case is easily broken against interference from the outside.
- the thin wall portion when the thin wall portion is provided by cutting out the inner surface of the battery case, the thin wall portion is formed flush with the outer surface of the battery case.
- the thin portion is formed by providing a concave portion on the outer surface of the battery case. Therefore, a thin part is formed in the shape dented rather than the other part in the outer surface of a battery case. Thereby, it becomes difficult for a thin part to collide with another member. Furthermore, it can avoid that a thin part collides with another member directly by arrange
- a material of the protective material a gel material, a rubber sheet, a cloth, a soft resin material, or the like can be used.
- the recess has a flat bottom surface and 90% or more of the bottom surface is covered with a protective material. If the thin-walled portion is provided by forming a notch in the wall portion of the battery case, for example, stress concentrates, and the battery case may be easily broken due to an impact caused by dropping of the secondary battery or the like. On the other hand, when the thin portion is provided by forming the concave portion on the flat bottom surface, the thin portion becomes flat and stress concentration can be avoided. Therefore, it is possible to prevent the battery case from being easily broken against an impact caused by dropping of the secondary battery.
- the fracture may spread over a wide range starting from the thin part.
- it is a thin part which has a flat bottom face, it will become easy to stop a fracture
- the thickness of the fragments generated from the thin portion is reduced, the impact when the fragments collide with other members is also reduced.
- the bottom width is preferably 10 to 90 mm. Further, it is preferably 10 to 60 mm or 10 to 30 mm depending on the size of the secondary battery.
- the “width” here is the length of the short side if the bottom surface is rectangular. If the bottom is circular, it is the diameter. If the bottom surface is elliptical, it has a short diameter. If the bottom surface is striped, it is the width.
- the thin-walled portion has a substantially rectangular shape when viewed from above, and the longitudinal direction thereof and the longitudinal direction of the chamber when viewed from above are preferably parallel.
- the thin-walled portion often breaks as a crack along the longitudinal direction of the chamber as viewed from above. Therefore, it can suppress that the fracture
- the protective material has a plate shape having an upper surface substantially parallel to the bottom surface of the recess and a lower surface facing the bottom surface of the recess, and the thickness thereof is preferably equal to or less than the maximum depth of the recess.
- the accommodating portion includes a substantially rectangular bottom portion having a pair of long sides and a pair of short sides, a pair of opposed short side walls rising from the pair of short sides, and a bottom portion. And side portions having a pair of opposed longitudinal side walls rising from the pair of long sides.
- the at least one partition wall has a plate shape substantially parallel to the pair of short end portions.
- One of the thin portions of the two adjacent chambers is provided on one of the pair of long side walls, and the other of the strong portions of the two adjacent chambers is provided on the other of the pair of long side walls.
- the accommodating portion includes a substantially rectangular bottom portion having a pair of long sides and a pair of short sides, a pair of opposed short side walls rising from the pair of short sides, and a bottom portion. And side portions having a pair of opposed longitudinal side walls rising from the pair of long sides.
- the at least one partition wall has a plate shape substantially parallel to the pair of short end portions.
- the lid is provided with one thin portion having relatively high strength and one thin portion having relatively low strength.
- One of the thin portions of the two adjacent chambers is provided near one of the pair of long side walls of the lid, and the other of the thin portions of the two adjacent chambers is near the other of the pair of long side walls of the lid. Is provided.
- FIG. 1 the external appearance of the secondary battery which concerns on Embodiment 1 of this invention is shown with a perspective view.
- FIG. 2 shows the internal structure of the secondary battery.
- the internal structure of the secondary battery is shown by cutting out a part of the case and the lid.
- the battery 10 in the illustrated example has an opening, and includes a housing portion 16 that houses a power generation element, and a lid 18 that seals the opening of the housing portion 16.
- the housing 16 and the lid 18 are collectively referred to as a battery case.
- the power generation element includes an electrode group 24 and an electrolyte solution (not shown) made of a sulfuric acid aqueous solution, for example.
- the electrode group 24 includes a positive electrode, a negative electrode, and a separator interposed therebetween.
- the housing part 16 and the lid 18 are made of an insulator.
- the insulator include polypropylene, high density polyethylene, polystyrene, acrylic resin, styrene resin, and ABS resin.
- the accommodating portion 16 includes a substantially rectangular bottom, a pair of long side walls 52 rising from a pair of long sides of the bottom, and a pair of short side walls 54 rising from a pair of short sides of the bottom. And a side part.
- the inside of the battery case composed of the accommodating portion 16 and the lid 18 is divided into a plurality (six in the illustrated example) of chambers (cells) 22 by at least one (five in the illustrated example) partition walls.
- Each partition wall is formed by a partition wall lower portion 20 that partitions the inside of the accommodating portion 16 and a rib 18 c described later, and is substantially parallel to the short side wall 54.
- each electrode group 24 and an electrolytic solution are accommodated. Between adjacent chambers 22, each electrode group 24 is connected in series via a strap 26 and a connection portion 28. In the electrode group 24 housed in the chambers 22 at both ends of the housing portion 16, each positive or negative electrode is connected to the positive or negative pole columns 30 and 32.
- the lid 18 has a top plate portion 18a that is substantially the same shape as the bottom portion of the housing portion 16, a leg portion 18b that falls from the outer peripheral portion of the top plate portion 18a by a predetermined length, and a position corresponding to each partition wall lower portion 20 of the housing portion 16. And ribs 18c that form the partition walls together with the partition lower portions 20.
- the accommodating portion 16 and the lid 18 are joined to each other by the leg portion 18b being welded to the upper end portion of the accommodating portion 16 and the partition wall lower portion 20 and the rib 18c being welded.
- a pair of electrode terminals 34 and 36 respectively connected to the pole columns 30 and 32 are near both ends in the longitudinal direction of the battery case (hereinafter referred to as the longitudinal direction X) and in the battery case. Each is provided at a position biased to one side in the short direction (hereinafter referred to as the short direction Y). Further, a plurality of electrolyte injections for injecting the electrolyte into each chamber 22 so as to be arranged at equal intervals in the longitudinal direction X at a position biased to the other of the short side direction Y on the upper surface of the top plate 18a. A hole 38 is provided. Each electrolyte injection hole 38 is sealed with a stopper 40.
- the container 16 is generally filled with an electrolyte so that the liquid level is 70 to 80% of the depth H of the inside dimension. Gases such as air are present in a portion above the liquid level of the electrolytic solution inside the battery case. Therefore, the upper part of the battery case (the portion of 20 to 30% from the top of the side part of the accommodating part 16 and the lid 18) constitutes a gas holding part 16a for holding gas inside. On the other hand, the lower part of the battery case (70 to 80% from the bottom of the side part of the storage part 16 and the bottom part of the storage part 16) constitutes a liquid holding part 16b that holds the electrolyte inside.
- the average thickness D1 of the gas holding part 16a is smaller than the average thickness D2 of the liquid holding part 16b. Therefore, in the battery 10 of the illustrated example, all or most (for example, 80% or more) of the gas holding part 16a on the side part of the battery case is a thin part. As a result, the gas holding part 16a on the side of the battery case has a lower strength (for example, tensile strength) than the liquid holding part 16b.
- the gas holding part 16a when the gas holding part 16a is filled with a flammable gas (for example, hydrogen gas) generated by overcharging or the like and ignited, the internal pressure of the battery case suddenly increases. Any part of the gas holding part 16a on the side part of this part breaks early. As a result, a further increase in the internal pressure is suppressed, and the liquid holding portion 16b can be prevented from breaking. Therefore, it is possible to avoid the electrolyte from flowing out from the liquid holding part 16b.
- a flammable gas for example, hydrogen gas
- the thin-walled portion breaks at an early stage, it is possible to suppress the breaking energy from increasing. Therefore, the energy which scatters electrolyte solution and a fragment is suppressed. For this reason, even if electrolyte solution and a fragment
- the ratio of the average thickness D1 of the gas holding part 16a to the average thickness D2 of the liquid holding part 16b is not limited to this, but can be 40 to 60%, for example. By setting the ratio to 60% or less, it can be said that when the internal pressure increases, the gas holding portion 16a is easily broken early. On the other hand, by setting the ratio to 40% or more, if the battery case has a general strength, when a large external force is applied to the battery case, for example, the battery 10 may be accidentally dropped or other members may be held in gas. Even when it collides with the part 16a, the gas holding part 16a can be easily prevented from being destroyed.
- the ratio of the average tensile strength of the gas holding part 16a to the average tensile strength of the liquid holding part 16b is not limited to this, but may be 60 to 70%, for example.
- the average thickness is a predetermined number of flat portions excluding the corner portions and portions where the thicknesses are particularly large, such as portions having protrusions, in each of the gas holding portion 16a and the liquid holding portion 16b. The thickness can be determined by measuring the thickness (for example, 10 locations) and averaging it.
- Embodiment 2 Next, Embodiment 2 of the present invention will be described.
- the secondary battery of the second embodiment is externally the same as the battery 10 of the first embodiment, and thus will be described with reference to FIGS.
- the average thickness of the gas holding part 16a of the longitudinal side wall 52 is smaller than that of the liquid holding part 16b in the side part of the battery case.
- the average thickness of the gas holding part 16a of the short side part 54 is the same as the average thickness of the liquid holding part 16b.
- the gas holding part 16a of the longitudinal side wall 52 for example, a part of 80% or more
- the portion that receives the force can be a thin-walled portion. Therefore, substantially the same effect as in the first embodiment can be achieved.
- the ratio of the thin portion in the battery case is smaller than that in the first embodiment, it is possible to suppress a decrease in the strength of the battery case. Therefore, it is possible to suppress the scattering of the fragments and the electrolytic solution while reducing the possibility that the battery case is destroyed by the external force.
- the average thickness of the long side wall 52 of the gas holding part 16a is the same as the average thickness of the liquid holding part 16b. Is a modification of the present embodiment, and the present invention includes this.
- FIG. 4 is a perspective view illustrating an appearance of the secondary battery according to the third embodiment.
- a thin portion is formed only in a part of the gas holding portion 16 a of the longitudinal side wall 52.
- a rectangular thin portion 41 having a longitudinal direction parallel to the longitudinal direction X is provided on the longitudinal side wall 52 of the gas holding portion 16a.
- the pair of long sides of the thin portion 41 is located at the upper end and the lower end of the thin portion 41.
- the pair of short sides of the thin portion 41 is parallel to the vertical direction of the battery case.
- the thin portion 41 is preferably provided so as to partially overlap all the chambers 22. Thereby, when the internal pressure rises in any chamber 22, the thin portion 41 can be opened so that the gas in the chamber 22 is released to the outside. Further, the thin portion 41 can be provided only on one of the pair of longitudinal side walls 52 or on both.
- the first groove 41a is formed along the upper end of the thin portion 41
- the second groove 41b is formed along the lower end.
- channel 41b is larger than the depth h1 of the 1st groove
- the non-breaking portion 41c functions like a hinge, and the thin part 41 opens obliquely downward. Therefore, since the gas inside the battery 10A is ejected downward as indicated by an arrow, even if the electrolyte is splashed, the splash is also scattered obliquely downward. Therefore, the electrolytic solution can be prevented from scattering over a wide range, and the safety of the battery can be further improved.
- the ratio of the depth h1 of the first groove 41a to the depth h2 of the second groove 41b: h1 / h2 is not limited to this, but can be, for example, 1/3 to 1/2.
- Such first and second grooves can be applied to the thin portion of the battery according to the embodiment described above or below, and these modifications are also included in the present invention.
- the area of the thin portion 41 is not limited to, for example, if 80D26 type, preferably in the 30 ⁇ 65cm 2. If the area of the thin portion 41 is less than 30 cm 2 , the area is too small, and the thin portion 41 may not break early. On the other hand, when the area of the thin portion 41 exceeds 65 cm 2 , the strength of the battery case 16 may be rapidly reduced. A more preferable area of the thin portion 41 is 40 to 50 cm 2 .
- the thin part 41 can be opened more obliquely downward.
- each groove 41a and 41b is not particularly limited, such as a U shape, a rectangular shape, a triangular shape, or the like.
- the second groove 41b is preferably sharpened toward the bottom (wedge shape) in order to facilitate breakage.
- the cross-sectional shape of the second groove 41b is preferably a triangular shape.
- FIG. 7 shows a modification of the secondary battery of the third embodiment.
- a hinge 55 is provided inside the battery so that the portion along the first groove 41a does not break when the internal pressure of the battery case increases.
- the hinge 55 is provided so as to straddle between the thin portion 41 and the longitudinal side wall 52 above it. With this configuration, the thin portion 41 can be more reliably opened obliquely downward.
- the first groove, the second groove, and the hinge as described above can be basically applied to the case where the thin portion 41 is provided on the short side wall 54, and these aspects are also included in the present invention.
- FIG. 8 is a perspective view illustrating an appearance of the secondary battery according to the fourth embodiment.
- the fourth embodiment is a modification of the first to third embodiments.
- the battery 10B of the fourth embodiment is different from the batteries of the first to third embodiments in that the battery 10B includes a cover 14 that covers the gas holding portion 16a.
- the material of the cover 14 has high acid resistance in consideration of the properties of the electrolytic solution.
- rubber materials such as chloroprene rubber, ethylene-propylene rubber, natural rubber, synthetic isoprene rubber, styrene-isoprene-styrene rubber, and polyisoprene rubber, and polyethylene, polypropylene, nylon, Teflon (registered trademark), polyvinyl chloride, Resin materials such as ABS resin, polyacrylic acid ester, and silicone resin can be preferably used.
- a composite material of these materials and ceramics can also be used.
- the form of the cover 14 can be a strip, a sheet, a net, a fiber, or a cloth in addition to a plate.
- the cover 14 is placed at a corresponding position in consideration of workability. It is preferable to provide an opening to facilitate connection of the power cable and replenishment of the electrolyte.
- the “corresponding position” refers to a position that makes it easy to access the electrode terminal installation portion and the electrolyte injection hole from the outside in a state where the cover 14 is attached to the battery 10B. Typically, it refers to the position facing the electrode terminal installation part or the electrolyte injection hole.
- the cover 14 is provided with a predetermined number (eight in the illustrated example) of openings 42 at positions facing the installation portions of the electrode terminals 34 and 36 and the openings 38.
- FIG. 9 shows a case where the thin portion 41 is covered by the cover 14.
- the lowermost end portion 14 a of the cover 14 is located below the lower end of the thin portion 41.
- the secondary battery of the fifth embodiment is the same in appearance as the secondary batteries of the first to fourth embodiments. Therefore, description will be made with reference to the reference numerals in FIGS.
- a secondary battery of Embodiment 5 is obtained by further adding a reinforcing material to each of the batteries of Embodiments 1 to 4.
- the reinforcing material is for increasing the strength of the portion other than the thin-walled portion of the battery case, and can be formed from, for example, a tape-shaped member.
- the reinforcing material is preferably bonded to the inner surface of the battery case with an adhesive material.
- the location where the reinforcing material is provided is set according to the mode in which the thin portion is provided in the gas holding portion 16a.
- the reinforcing material is preferably provided in a portion 16c adjacent to the gas holding part 16a of the liquid holding part 16b. Thereby, it can prevent that the fracture
- the upper end portion 16d is a portion where the leg portion 18a of the lid 18 is welded, and by reinforcing the portion, it is possible to effectively prevent the breakage from reaching the entire battery case.
- the battery 10 of FIG. 1 it is also preferable to provide a reinforcing material so as to straddle the boundary line between the liquid holding part 16b and the gas holding part 16a.
- a reinforcing material By providing the reinforcing material in such a manner, even if fragments are generated in the gas holding portion 16a, the fragments can be connected to the liquid holding portion 16b with the reinforcing material. Therefore, scattering of fragments can be suppressed.
- the short side wall 54 is provided. It is also preferable to provide a reinforcing material in the gas holding part 16a. Thereby, only the longitudinal side wall 52 of the gas holding
- the reinforcing material 56 may be straddled between the thin portion 41 and the longitudinal side wall 52 above the thin portion 41. Thereby, the reinforcing material 56 is made to function like a hinge, and the same effect as the case of FIG. 7 can be achieved.
- the member constituting the reinforcing member preferably has a breaking strength of 37.5 to 150 N / 25 mm.
- This breaking strength is measured by using a tensile tester (for example, AGS-500B manufactured by Shimadzu Corporation) on a test piece processed into a shape specified by Japanese Industrial Standards (standard number: JIS : K 1133: 1995). It is a value measured by stretching under the condition of 10 mm / min.
- the member constituting the reinforcing material has an elongation rate of 30 to 125% until it breaks. Thereby, it can prevent that reinforcement material itself fractures
- a more preferable range of the stretching ratio is 100 to 125%.
- This stretch rate is determined by using a tensile tester (for example, AGS-500B manufactured by Shimadzu Corporation) on a test piece processed into a shape specified in Japanese Industrial Standards (standard number: JIS K 7113: 1995). It is a value obtained by comparing the original dimension of the test piece with the dimension when the test piece is stretched under the condition of 10 mm / min and the test piece is broken.
- the reinforcing material can be provided at a desired position. Therefore, the degree of freedom in design increases.
- the material of the reinforcing material varies depending on the properties of the specific electrolyte, but polyvinyl chloride, polytetrafluoroethylene, imide resin, amide resin, olefin resin, ABS resin, acrylic resin, silicone resin , Synthetic rubber, natural rubber and the like can be used alone or in combination. Further, a composite material of a ceramic and a metal such as copper, iron, nickel, aluminum, and stainless steel, and the above-described resin, to which an appropriate elongation rate is imparted, can be used.
- the adhesive material includes, for example, acrylic resin, synthetic rubber, rosin derivative, and terpene resin.
- the adhesive strength of the adhesive is preferably 12.5 to 20 N / 25 mm (measured value at 23 ° C.).
- Example 1 As the secondary battery of Example 1, six secondary batteries of type 80D26 conforming to JIS D 5301 (starting battery) were produced.
- the dimensions of the secondary battery are 260 ⁇ 173 ⁇ 202 mm, and the total height including the electrode terminals and the like is 225 mm.
- the number of chambers (cells) inside the battery case is six.
- the height of the inner method of the side part of the battery case was 195 mm, and an electrolytic solution was added up to 80% thereof.
- the average thickness of the part (liquid holding part) up to 80% of the inner method is 2.5 mm, and the thickness of the upper 20% part (gas holding part) is 1.5 mm. It was.
- the lid has an average thickness of the top plate portion of 2.3 mm and a leg portion thickness of 3.5 mm.
- Example 2 Six secondary batteries were produced in the same manner as in Example 1 except that the average thickness of the gas holding part on the side of the battery case was 1.0 mm.
- Example 3 Except that the thickness of the gas holding part on the long side wall of the battery case was 1.5 mm and the thickness of the gas holding part on the short side wall of the battery case was 2.5 mm, A secondary battery was produced.
- Example 4 A thin part was formed only in a part of the gas holding part on the longitudinal side wall of the battery case.
- the thickness of the portion other than the thin wall portion of the longitudinal side wall was set to 2.5 mm.
- the thin-walled portion has a rectangular shape as shown in FIG. 4 and is formed so as to partially overlap all the chambers. The dimensions were 20 ⁇ 240 mm.
- channel was provided along the lower end of a thin part.
- the thickness of the thin portion other than the groove was 1.5 mm.
- channel was provided along the left end and right end of a thin part. Except for the above, six secondary batteries were fabricated in the same manner as in Example 1.
- Example 5 As shown in FIG. 8, 30% of the lid and the side of the battery case were covered with a cover.
- the cover was a sheet and the thickness was 1.0 mm.
- the material was polyethylene.
- a hole was provided at a position of the cover facing the electrode terminal installation part and the lid opening part. Except for the above, six secondary batteries were fabricated in the same manner as in Example 1.
- Example 6 A tape-shaped reinforcing material was adhered to the inside of the side part of the battery case with an adhesive so as to straddle the boundary between the gas holding part and the liquid holding part.
- the upper end of the reinforcing material was set to a position 1/3 from the bottom of the vertical width of the gas holding unit, and the lower end of the reinforcing material was set to a position 1.5 cm from the upper end of the liquid holding unit.
- a reinforcing material a polyvinyl chloride tape having a thickness of 0.2 mm and a width of 20 mm was used.
- An acrylic resin was used as the adhesive material.
- the breaking strength of the reinforcing material was 45 N / 25 mm.
- the elongation rate was 100%.
- the adhesive strength of the adhesive was 12.5 N / 25 mm. Except for the above, six secondary batteries were fabricated in the same manner as in Example 1.
- the secondary battery is charged with electric power of 6 A ⁇ 1 hr or more, and hydrogen gas and oxygen gas are continuously generated inside the secondary battery by continuing the charge as it is even after full charge. I did it. In this way, the combustible gas was filled in each chamber of the secondary battery in a state of extremely high flammability.
- Example 1 in which the gas holding parts on the side portions of the battery case were all thin parts, middle pieces (3 to 7 ⁇ 3 to 7 cm) were generated in the thin parts. was suppressed when compared with Comparative Example 1. Since it was a fragment generated from the thin portion, the thickness of the fragment was also smaller than that of Comparative Example 1. In the drop test, the battery case was not particularly damaged. Similar results were obtained in Example 2 in which the thickness of the thin portion was changed slightly. In other Examples 3 to 6, none of the battery cases were particularly damaged in the drop test.
- Example 3 in which the entire gas holding part on the longitudinal side wall was a thin part, almost the same result as in Example 1 was obtained.
- Example 2 the short side wall was also damaged, but in Example 3, the short side wall was not damaged.
- Example 4 the area of the thin part is smaller than in Examples 1 to 3, but the groove is provided along the upper end and the lower end of the thin part and the depth of the groove at the lower end is increased.
- the part broke at a fairly early stage, and the break did not reach other parts.
- the scattered pieces were only small pieces (3 ⁇ 3 cm or less), and the scattering was also suppressed.
- the part along the upper end of the thin part did not fracture
- Example 5 the gas holding part and the lid were covered with a cover made of polyethylene. Thereby, it was possible to almost completely prevent the fragments and the electrolyte from being scattered.
- Example 6 in which the reinforcing material was provided at the boundary between the gas holding part and the liquid holding part, a part of the fragments generated from the gas holding part of the battery case was fixed to the liquid holding part by the reinforcing material. Therefore, the scattering of fragments was further suppressed than in Example 1.
- FIG. 12 is a perspective view illustrating an appearance of the secondary battery according to the sixth embodiment.
- FIG. 13 is a perspective view showing an internal structure of the secondary battery according to the sixth embodiment. In FIG. 13, a part of the battery case is cut away to show the internal structure of the secondary battery.
- a predetermined number (six in the illustrated example) of thin-walled portions 42 are provided in the gas holding portions 16 a above the pair of long side walls 52.
- One thin portion 42 is independently provided in each chamber 22.
- flammable gas is generated by misuse of the secondary battery such as overcharge and reverse connection, and each chamber 22 is filled with flammable gas. Even when the combustible gas is ignited inside 22 and the internal pressure suddenly increases, the thin portion 42 corresponding to the chamber 22 can be quickly broken to reduce the internal pressure.
- the thin portions 42 are provided in a staggered arrangement between the pair of longitudinal side walls 52. That is, one of the two thin portions 42 of the two adjacent chambers 22 is provided on one of the pair of long side walls 52, and the other is provided on the other of the pair of long side walls 52. That is, the thin portions 42 of the chambers 22 are alternately provided on the pair of long side walls 52.
- the distance L between adjacent thin portions 42 can be increased by providing the plurality of thin portions 42 in a staggered arrangement between the pair of longitudinal side walls 52. Therefore, when one thin portion 42 breaks, the break can be prevented from propagating to another adjacent thin portion 42. Therefore, damage to the battery case can be further suppressed, and scattering of fragments and electrolyte can be more effectively suppressed.
- the ratio of the average thickness D1 of the thin-walled portion 42 to the average thickness D2 of the longitudinal side wall 52 of the portion other than the thin-walled portion 42 is not limited to this, but is 40 to 60%, for example. be able to.
- the ratio of the average tensile strength of the thin-walled portion 42 to the average tensile strength of the longitudinal side wall 52 of the portion other than the thin-walled portion 42 is not limited to this, but may be 60 to 70%, for example. .
- the thin portions 42 of the respective chambers 22 are not provided in a line on the one long side wall 52, but the thin portions 42 are provided in a staggered arrangement between the pair of long side walls 52. Yes. Thereby, it is possible to increase the interval between the adjacent thin portions 42. Therefore, even when the combustible gas is ignited in one chamber 22 and the internal pressure rapidly increases and the thin portion 42 of the chamber 22 is broken, the thin portion 42 of the adjacent chamber 22 is opposite. Since it exists in the side long side wall 52, a fracture
- the thin portions 42 are provided in a staggered arrangement between the pair of longitudinal side walls 52, but the present invention is not limited to this.
- the thin-walled portions 42 of the chambers 22 can be provided in a staggered arrangement within one longitudinal side wall 52.
- the thin portions 42 can be provided in a staggered arrangement so that the upper and lower positions are shifted between the adjacent thin portions 42.
- a thin portion having a groove along the upper end and the lower end can be provided independently for each chamber 22.
- the thin part can also be provided in a staggered arrangement.
- Embodiment 7 of the present invention will be described with reference to FIG.
- the thin portion 42 is provided not on the long side wall 52 but on the top plate portion 18 a of the lid 18.
- the electrolyte injection holes 38 are provided at equal intervals in the longitudinal direction X at the center in the lateral direction Y, not at the position biased to the other of the lateral direction Y on the upper surface of the top plate portion 18a. It has been.
- the thin portion 42 is provided in an independent one for each chamber 22, (in the illustrated example, four thin portions 42 of 42 1-42 4) at least a portion of the thin portion 42 of each chamber 22, the top plate portion 18a is provided in a staggered arrangement.
- the interval between the thin portions 42 of the adjacent chambers 22 can be increased by providing the thin portions 42 of the respective chambers 22 in a staggered arrangement. Therefore, it is possible to prevent breakage from propagating between the thin portions 42.
- a part of the thin portion 42 is not in staggered. In this respect, it is possible to provide all the thin portions 42 in a staggered arrangement by shifting the positions of the electrode terminals 36 and the electrolyte solution injection holes 38.
- a pair of thin portions is provided corresponding to each chamber 22. More specifically, although not clearly shown in the drawing, for each chamber 22, a strong thin portion 44 is provided on one of the pair of long side walls 52, and the thin wall is provided on the other of the pair of long side walls 52. A portion 46 is provided.
- the strong thin portion 44 is a thin portion having a strength (tensile strength) larger than that of the weak thin portion 46, and the average thickness of the strong thin portion 44 is larger than that of the weak thin portion 46.
- One of the thin portions 46 of the adjacent chambers 22 is provided on one of the pair of long side walls 52, and the other of the thin portions 46 of the adjacent chambers 22 is provided on the other of the pair of long side walls 52. Yes. Therefore, in each longitudinal side wall 52, the thin-walled portions 44 and the weak-thin wall portions 46 are alternately arranged so that the thin-walled portions 44 or the weak-thin wall portions 46 are not adjacent to each other.
- the thin wall portions 44 of each chamber 22 are provided in a staggered arrangement between the pair of longitudinal side walls 52.
- the thin wall portions 46 of the chambers 22 are provided in a staggered arrangement between the pair of longitudinal side walls 52.
- the thin-walled portions 44 and the weak-thinned portions 46 are alternately arranged on the respective longitudinal side walls 52, thereby increasing the distance between the thin-walled portions 46 that are expected to break earlier. it can. Therefore, the breakage of the weak wall portion 46 of one chamber 22 is difficult to propagate to the weak wall portion 46 of the adjacent chamber 22, and the battery case can be prevented from being broken.
- the average thickness of the thin-walled portion 46 is 40% of the average thickness of the portions other than the thin-walled portion of each longitudinal side wall 52, and the average thickness of the strong-thinned portion 44 is the thickness of each longitudinal-side wall 52. It can be set to 60% of the average thickness of portions other than the thin portion.
- Example 7 Indenting the inner wall so that the thickness of the 20% portion of one or the other of the pair of longitudinal side walls surrounding each chamber is 60% of the other portion, one by one in each chamber, A thin part having an average thickness of 1.5 mm was formed. Each of the thin wall portions is formed in one of the pair of long side walls, and the other is the other of the pair of long side walls so that the thin wall portions are in a staggered arrangement between the pair of long side walls. Formed. Except for the above, six secondary batteries were fabricated in the same manner as in Example 1.
- Example 8 Six secondary batteries were fabricated in the same manner as in Example 1 except that the average thickness of the thin-walled portion was 1 mm (40% of the other portions).
- FIG. 16 is a perspective view illustrating a schematic configuration of the secondary battery according to the ninth embodiment.
- FIG. 17 is a perspective view showing the internal structure of the secondary battery. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG.
- FIG. 19 is an enlarged cross-sectional view of a thin portion. In FIG. 17, the case and the lid are partially cut away to show the internal structure of the secondary battery.
- thin portions 43 corresponding to the cell chambers 22 are formed so as to be arranged at equal intervals in parallel with the longitudinal direction X at a position biased to the other of the width direction Y in the top plate portion 18a. ing.
- the thin-walled portion 43 is formed by providing a concave portion 45 having a flat bottom surface on the outer surface of the top plate portion 18a.
- the recess 45 has a substantially rectangular shape when viewed from above.
- the width of the bottom, that is, the length of the short side is preferably 10 to 90 mm.
- the aspect ratio is preferably 3: 2 to 4: 1.
- the chamber 22 has a rectangular shape in a top view, and the longitudinal direction thereof is along the width direction Y.
- the longitudinal direction of the recess 45 is also along the width direction Y, and the longitudinal direction of the chamber 22 as viewed from above is parallel to the longitudinal direction of the recess 45.
- a gel material for example, Alpha Gel (registered trademark of Taika Co., Ltd.)
- a rubber sheet for example, a rubber sheet, a cloth such as a nonwoven fabric, a soft resin material, or the like is disposed.
- the aspect which fixes the protective material 47 in the recessed part 45 is not specifically limited.
- the protective material 47 is formed of a material having a certain degree of rigidity, such as a rubber sheet or a soft resin material
- the protective material 47 is formed in substantially the same shape as the concave portion 45, and the protective material 47 is formed into the concave portion. It may be simply fitted into 45.
- the area of the bonding material 48 in a top view is larger than the area of the recess 45 in a top view. It is also preferable to make it smaller.
- the ratio of the area of the bonding material 48 in the top view to the area of the recess 45 in the top view is preferably 3 to 25%.
- the ratio By setting the ratio to 25% or less, it is possible to prevent the strength of the thin portion 43 from being increased by joining with the protective material 47 and preventing the early break of the thin portion 43 from being hindered. On the other hand, by setting the ratio to 3% or more, it is possible to prevent the protective material 47 from easily falling out of the recess 45.
- the thin part 43 of Embodiment 9 may be provided in the side part of a battery case, and can also be formed in the staggered arrangement
- the protective material 47 can be similarly applied to the thin portion in any of the above-described embodiments.
- the secondary battery of the secondary battery of the present invention is useful when, for example, a secondary battery is used as an in-vehicle power source, a driving power source for various portable electronic devices, or a power source in a power storage facility.
- a secondary battery such as a lead storage battery in which safety is left to the user's usage without being packed.
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Abstract
Description
前記電槽は、前記電解液の液面より下部で内部に前記電解液を保持する液体保持部と、前記電解液の液面より上部で内部に気体を保持する気体保持部とを有し、
前記気体保持部が薄肉部を含む、二次電池に関する。
(実施形態1)
図1に、本発明の実施形態1に係る二次電池の外観を斜視図により示す。図2に、同二次電池の内部構造を示す。なお、図2においては、ケース及び蓋の一部を切り欠いて、二次電池の内部構造を示している。
次に、本発明の実施形態2を説明する。実施形態2の二次電池は、実施形態1の電池10と外観的には同一であるので、図1及び図2を流用して説明する。
次に、図4を参照して、本発明の実施形態3を説明する。図4は、実施形態3の二次電池の外観を示す斜視図である。図示例の電池10Aにおいては、長手側壁52の気体保持部16aの一部分だけに薄肉部が形成されている。
次に、図8を参照して、本発明の実施形態4を説明する。図8は、実施形態4の二次電池の外観を示す斜視図である。実施形態4は、実施形態1~3を改変したものである。実施形態4の電池10Bが、実施形態1~3の各電池と異なるのは、電池10Bが気体保持部16aを覆うカバー14を備えている点である。
次に、本発明の実施形態5を説明する。実施形態5の二次電池は、外観的には実施形態1~4の二次電池と同じである。よって、図1~8の符号を流用して説明する。
例えば、図1の電池10では、気体保持部16aの全体が薄肉部であるために、補強材は、液体保持部16bの気体保持部16aと隣接する部分16cに設けるのが好ましい。これにより、気体保持部16aにおける破断が液体保持部16bに伝播するのを防止することができる。また、図1の電池10では、電槽16の上端部16dの内側に補強材を設けるのも好ましい。上端部16dは、蓋18の脚部18aが溶着される箇所であり、その箇所を補強することにより、破断が電槽の全体に及ぶのを効果的に防止することができる。
実施例1の二次電池として、JIS D 5301(始動用電池)に準拠する型式80D26の二次電池を6体作製した。二次電池の寸法は、260×173×202mmであり、電極端子などを含めた総高は225mmである。電槽の内部の室(セル)の数は6である。
電槽の側部の気体保持部の平均の厚みを1.0mmとしたこと以外は、実施例1と同様にして、6体の二次電池を作製した。
電槽の長手側壁の気体保持部の厚みを1.5mmとし、電槽の短手側壁の気体保持部の厚みを2.5mmとしたこと以外は、実施例1と同様にして、6体の二次電池を作製した。
電槽の長手側壁の気体保持部の一部分だけに薄肉部を形成した。長手側壁の薄肉部以外の部分の厚みは全て2.5mmとした。薄肉部は、図4に示したような長方形状とし、全ての室と一部分が重なるように形成した。その寸法は、20×240mmとした。薄肉部の上端に沿って第1溝を設けるとともに、薄肉部の下端に沿って第2溝を設けた。溝以外の部分の薄肉部の厚みは、1.5mmとした。第1溝及び第2溝の横断面は三角形状とした。第1溝の深さは0.2mmとし、第2溝の深さは0.5mmとした。また、薄肉部の左端及び右端に沿って、第2溝と同じ横断面形状で深さが同じ溝を設けた。以上のこと以外は、実施例1と同様にして、6体の二次電池を作製した。
蓋、及び電槽の側部の上から30%の部分を、図8に示したように、カバーにより覆った。カバーはシート状で、厚みは1.0mmとした。材質はポリエチレンとした。また、カバーの、各電極端子の設置部及び蓋の開口部と正対する位置には、孔を設けた。以上のこと以外は、実施例1と同様にして、6体の二次電池を作製した。
気体保持部と液体保持部との境界を跨ぐように電槽の側部の内側にテープ状の補強材を粘着材により接着した。補強材の上端は、気体保持部の上下方向の幅の下から1/3の位置とし、補強材の下端は、液体保持部の上端から1.5cmの位置とした。補強材として、厚さ0.2mm、幅20mmのポリ塩化ビニル製のテープを使用した。粘着材にはアクリル系樹脂を使用した。
電槽の側部の厚みを全て2.5mmとしたこと以外は、実施例1と同様にして、6体の二次電池を作製した。
二次電池の長手方向Xの中央付近の1つの室に対応する電解液注入用孔の栓をはずし、外部から、その室の電解液の液面よりも上の内部に、長さ10cm、径0.3mmの2本の銅線の各先端部を互いに離れた状態で挿入した。その2本の銅線の先端部は、長さ5mm、径0.1mmの非常に細い銅線により接続しておいた。2本の銅線の先端部を挿入した後、栓で電解液注入用孔を封口した。
二次電池を、1mの高さから、コンクリートの床に落下させた。
次に、図12及び図13を参照して、実施形態6を説明する。図12は、実施形態6の二次電池の外観を示す斜視図である。図13は、実施形態6の二次電池の内部構造を示す斜視図である。なお、図13においては、電槽の一部を切り欠いて、二次電池の内部構造を示している。
次に、図14を参照して、本発明の実施形態7を説明する。実施形態7の電池10Dは、薄肉部42が長手側壁52にではなく、蓋18の天板部18aに設けられている。また、電解液注入用孔38は、天板部18aの上面の短手方向Yの他方に偏った位置にではなく、短手方向Yの中央で、長手方向Xに等間隔に並ぶように設けられている。
次に、図15を参照して、本発明の実施形態8を説明する。実施形態8の電池10Eにおいては、各室22に対応して一対の薄肉部が設けられている。より具体的には、図には明瞭に表されていないが、室22毎に、一対の長手側壁52の一方には強薄肉部44が設けられ、一対の長手側壁52の他方には弱薄肉部46が設けられている。ここで、強薄肉部44は弱薄肉部46よりも強度(引張強度)が大きい薄肉部であり、強薄肉部44の平均的な厚みは弱薄肉部46のそれよりも大きくなっている。
(実施例7)
各室を囲う一対の長手側壁の一方または他方の上から20%の部分の厚みが他の部分の60%の厚みとなるように内壁を窪ませることで、各室に1つずつ独立に、平均的な厚みが1.5mmである薄肉部を形成した。各薄肉部は、一対の長手側壁の間で千鳥配列となるように、隣接する2つの室の薄肉部の一方は、一対の長手側壁の一方に形成し、他方は、一対の長手側壁の他方に形成した。以上のこと以外は、実施例1と同様にして、6体の二次電池を作製した。
薄肉部の平均的な厚みを1mm(他の部分の40%の厚み)としたこと以外は、実施例1と同様にして6体の二次電池を作製した。
薄肉部を設けなかったこと以外は、実施例1と同様にして6体の二次電池を作製した。
次に、図16~図19を参照して、本発明の実施形態9を説明する。図16は、実施形態9に係る二次電池の概略構成を示す斜視図である。図17は、同二次電池の内部構造を示す斜視図である。図18は、図16のXVIII-XVIII線の矢視断面図である。図19は、薄肉部の拡大断面図である。なお、図17においては、ケース及び蓋の一部を切り欠いて、二次電池の内部構造を示している。
16…収容部、
16a…気体保持部、
16b…液体保持部、
18…蓋、
22…室、
24…電極群、
41、42、43…薄肉部、
41a…第1溝、
41b…第2溝、
44…強薄肉部、
45…凹部、
46…弱薄肉部、
47…保護材、
52…長手側壁、
54…短手側壁、
Claims (12)
- 正極、負極及びセパレータを有する電極群と、電解液と、前記電極群及び前記電解液を収容する、開口を有する収容部、及び前記収容部の開口を封口する蓋、を有する電槽と、を具備した二次電池であって、
前記電槽は、前記電解液の液面より下部で内部に前記電解液を保持する液体保持部と、前記電解液の液面より上部で内部に気体を保持する気体保持部とを有し、
前記気体保持部が薄肉部を含む、二次電池。 - 前記電槽の内部が、少なくとも1つの隔壁により複数の室に区分され、
前記複数の室のそれぞれが前記電極群と前記電解液とを収容し、
前記複数の室のそれぞれに対して、前記気体保持部に前記薄肉部が独立に形成されている、請求項1記載の二次電池。 - 前記収容部が、
一対の長辺及び一対の短辺を有する略長方形の底部と、
前記底部の一対の短辺から立ち上がる、対向する一対の短手側壁、及び前記底部の一対の長辺から立ち上がる、対向する一対の長手側壁を有する側部と、を含み、
前記少なくとも1つの隔壁は、前記一対の短手側壁と略平行な板状であり、
前記薄肉部が前記長手側壁または前記蓋に対して千鳥配列で形成されている、請求項2記載の二次電池。 - 隣り合う2つの前記室の前記薄肉部の一方は、前記一対の長手側壁の一方に設けられ、隣り合う2つの前記室の前記薄肉部の他方は、前記一対の長手側壁の他方に設けられている、請求項3記載の二次電池。
- 隣り合う2つの前記室の前記薄肉部の一方は、前記蓋の前記一対の長手側壁の一方寄りに設けられ、隣り合う2つの前記室の前記薄肉部の他方は、前記蓋の前記一対の長手側壁の他方寄りに設けられている、請求項3記載の二次電池。
- 前記薄肉部が上端及び下端を有する略長方形であり、
前記上端に沿って第1溝が設けられ、
前記下端に沿って第2溝が設けられ、
前記第2溝が前記第1溝よりも深い、請求項1~4のいずれか1項に記載の二次電池。 - 前記薄肉部が、前記気体保持部の外側面に凹部を設けることで形成されており、
前記薄肉部を保護する保護材が、前記凹部の中に配置されている、請求項1~5のいずれか1項に記載の二次電池。 - 前記保護材が、ゲル材料、ゴムシート、布、及び軟質樹脂材料よりなる群から選択される少なくとも1種を含む、請求項7記載の二次電池。
- 前記凹部が、平坦な底面を有し、前記底面の90%以上が前記保護材で覆われている、請求項7または8記載の二次電池。
- 前記保護材が、板状であり、その厚みが、前記凹部の最大深さ以下である、請求項9記載の二次電池。
- 前記収容部が、
一対の長辺及び一対の短辺を有する略長方形の底部と、
前記底部の一対の短辺から立ち上がる、対向する一対の短手側壁、及び前記底部の一対の長辺から立ち上がる、対向する一対の長手側壁を有する側部と、を含み、
前記少なくとも1つの隔壁は、前記一対の短手端部と略平行な板状であり、
前記複数の室のそれぞれに対して、前記一対の長手側壁の一方に比較的強度の大きい強薄肉部が設けられ、前記一対の長手側壁の他方に比較的強度の小さい弱薄肉部が設けられ、
隣り合う2つの前記室の前記強薄肉部の一方は、前記一対の長手側壁の一方に設けられ、隣り合う2つの前記室の前記強薄肉部の他方は、前記一対の長手側壁の他方に設けられている、請求項1記載の二次電池。 - 前記収容部が、
一対の長辺及び一対の短辺を有する略長方形の底部と、
前記底部の一対の短辺から立ち上がる、対向する一対の短手側壁、及び前記底部の一対の長辺から立ち上がる、対向する一対の長手側壁を有する側部と、を含み、
前記少なくとも1つの隔壁は、前記一対の短手端部と略平行な板状であり、
前記複数の室のそれぞれに対して、前記蓋に、比較的強度の大きい強薄肉部及び比較的強度の小さい弱薄肉部が1つずつ設けられ、
隣り合う2つの前記室の前記強薄肉部の一方は、前記蓋の前記一対の長手側壁の一方寄りに設けられ、隣り合う2つの前記室の前記強薄肉部の他方は、前記蓋の前記一対の長手側壁の他方寄りに設けられている、請求項1記載の二次電池。
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JP2018170151A (ja) * | 2017-03-29 | 2018-11-01 | 株式会社Gsユアサ | 鉛蓄電池 |
JPWO2021024681A1 (ja) * | 2019-08-06 | 2021-02-11 | ||
JP2023505971A (ja) * | 2020-07-10 | 2023-02-14 | 寧徳時代新能源科技股▲分▼有限公司 | 電池ケース、電池セル、電池、電池ケースの製造方法及び装置 |
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CN111883702B (zh) * | 2019-05-03 | 2023-04-18 | 孚能科技(赣州)股份有限公司 | 电池、电池盒及车辆 |
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JP2023505971A (ja) * | 2020-07-10 | 2023-02-14 | 寧徳時代新能源科技股▲分▼有限公司 | 電池ケース、電池セル、電池、電池ケースの製造方法及び装置 |
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