WO2012073438A1 - 電池パック - Google Patents
電池パック Download PDFInfo
- Publication number
- WO2012073438A1 WO2012073438A1 PCT/JP2011/006408 JP2011006408W WO2012073438A1 WO 2012073438 A1 WO2012073438 A1 WO 2012073438A1 JP 2011006408 W JP2011006408 W JP 2011006408W WO 2012073438 A1 WO2012073438 A1 WO 2012073438A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gas
- lid
- battery pack
- discharge duct
- gas discharge
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
- H01M50/367—Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a battery pack in which a plurality of unit cells are housed in a case.
- a battery pack in which a plurality of batteries are housed in a case so that a predetermined voltage and capacity can be output is widely used as a power source for various devices, vehicles, and a household power source.
- technology is being adopted that can be used for a wide variety of applications by connecting general-purpose batteries in parallel and in series, modularizing them to output a predetermined voltage and capacity, and combining these battery modules in various ways.
- This modularization technology improves the workability when assembling the battery pack and improves the performance of the battery stored in the battery module by improving the performance of the battery accommodated in the battery module.
- Patent Document 1 discloses a case in which a plurality of batteries are housed, a battery chamber that houses the batteries, and a discharge chamber that exhausts high-temperature gas released from the batteries, by a partition wall. And a power supply device including an exhaust mechanism having a configuration in which an opening of a safety valve of a battery is communicated with an exhaust chamber.
- the exhaust mechanism By configuring the exhaust mechanism in this way, the high-temperature gas released from the safety valve of the battery can flow into the exhaust chamber without flowing into the battery chamber, and can be discharged out of the case through the discharge port of the case.
- Patent Document 1 can prevent the gas flowing into the discharge chamber from the opening of the battery from flowing into the battery chamber again by making the exhaust chamber a sealed structure. It is excellent in that chain degradation can be prevented.
- Patent Document 1 does not describe any gas treatment when the gas is exhausted.
- an in-vehicle battery pack is often installed under a seat, and if the gas is released into the passenger compartment as it is, there is a possibility that an occupant may be in a dangerous state.
- the released gas when installed as a hypothetical power supply on the side of the outer wall of a house, the released gas may be blown to a person who happens to pass by the power supply.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a battery pack that reliably prevents water from entering from the outside and safely releases the gas to the outside when gas is generated from the battery. Is to provide.
- a first battery pack includes a plurality of unit cells that are lithium ion secondary batteries, a case that houses the plurality of unit cells, and a gas that is attached to the case and is generated from the unit cells.
- a gas discharge duct for discharging to the gas discharge duct wherein the gas discharge duct is provided with a lid made of a waterproof member in the middle of the outlet or the discharge path, and is sealed by the lid, and the lid is opened.
- An opening member for opening the gas discharge duct is further provided, and the opening member is configured to open the lid with the gas generated from the unit cell and to open the gas discharge duct. Yes.
- Opening the lid and opening the gas discharge duct means that the lid has some effect, such as forming a through hole in the lid, or removing the sealed state by moving or changing the shape of the lid. This means that the inside and outside of the battery pack communicate with each other.
- the fact that the opening member is operated by gas means that the opening member is allowed to open the gas discharge duct by gas temperature, pressure, flow, or the like.
- a second battery pack includes a plurality of unit cells that are lithium ion secondary batteries, a case that houses the plurality of unit cells, and a gas that is attached to the case and is generated from the unit cells.
- a gas discharge duct that discharges to the gas discharge duct, and the gas discharge duct is provided with a lid portion made of a waterproof member in the middle of the outlet or the discharge path, and is sealed by the lid portion.
- a structure is provided that opens by the gas generated from the battery.
- the opening of the lid portion by the gas generated from the unit cell means that the lid portion is broken or blown away by the gas pressure or melted by the gas heat to open a hole.
- a third battery pack according to the present invention includes a plurality of unit cells that are lithium ion secondary batteries and a case that houses the plurality of unit cells, and the case generates gas generated from the unit cells.
- a gas discharge hole for discharging to the outside is provided, the gas discharge hole is sealed by a lid portion made of a waterproof member, and the lid portion is configured to be opened by the gas generated from the unit cell. ing.
- the lid portion may be at least partially made of a waterproof and moisture permeable member.
- the waterproof and moisture permeable member is a member that does not allow water as a liquid to pass but allows water (steam) as a gas to pass through, and a gas discharge duct.
- water that tries to enter the inside from the outside of the battery pack shuts out, but the water vapor inside the battery pack is released to the outside.
- GORE-TEX Registered trademark
- entrant registered trademark
- DRY-TEC registered trademark
- the gas outlet can be set at a safe position.
- FIG. (A) is a typical longitudinal cross-sectional view of the exit vicinity of the gas exhaust duct which concerns on the modification 1 of Embodiment 1
- (b) is a figure of the state which the cover part opened.
- FIG. 1 is a schematic longitudinal cross-sectional view of the vicinity of the outlet of the gas exhaust duct according to the second modification of the first embodiment
- (b) is a view with the lid open
- (c) to (f) ) Is a diagram showing another example. It is a typical longitudinal cross-sectional view of the exit vicinity of the gas exhaust duct which concerns on the modification 3 of Embodiment 1.
- FIG. It is a typical longitudinal cross-sectional view of only the gas exhaust duct of Embodiment 2.
- FIG. 6 is a schematic longitudinal sectional view in the vicinity of an outlet of a gas discharge duct according to Modification 1 of Embodiment 2. It is the figure which showed the battery module in Embodiment 3 typically.
- FIG. 6 is a schematic diagram of a gas discharge duct according to a second modification of the second embodiment. 6 is a diagram schematically showing a battery pack in a modified example of Embodiment 3.
- FIG. (A) is a top view of a cover part, (b) is the XVB-XVB sectional view taken on the line of (a).
- the battery pack usually needs to have two opposing functions of keeping it sealed for waterproofing and quickly discharging the gas outside the battery pack when gas is generated in the battery pack. This is a problem that appears only when a large-capacity battery pack is used outdoors.
- the present invention has been made by the present inventors in order to solve such problems.
- a minimum unit of a plurality of unit cell assemblies is a battery block, a unit having a predetermined voltage and capacity in which a plurality of battery blocks are combined and housed in a casing is a battery module, and is a predetermined power source for electric devices and electric devices.
- a battery pack is a combination of a number of battery modules.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a battery 100 used in the battery block in the first embodiment.
- the battery used in the battery block of this embodiment may be a battery that can be used alone as a power source for portable electronic devices such as notebook computers (hereinafter, the battery used in the battery block is referred to as “unit cell”). ").
- the battery used in the battery block is referred to as “unit cell”.
- unit cell the battery used in the battery block.
- a high-performance general-purpose battery can be used as a unit cell of the battery block, it is possible to easily improve the performance and cost of the battery block.
- a cylindrical lithium ion secondary battery as shown in FIG. 1 can be adopted as the unit cell 100 of the present embodiment.
- This lithium ion secondary battery has a normal configuration, and includes a safety mechanism that releases gas to the outside of the battery when the pressure in the battery increases due to an internal short circuit or the like.
- a specific configuration of the unit cell 100 will be described with reference to FIG.
- an electrode group 4 in which a positive electrode 2 and a negative electrode 1 are wound through a separator 3 is housed in a battery case 7 together with a non-aqueous electrolyte. Insulating plates 9, 10 are arranged above and below the electrode group 4, the positive electrode 2 is joined to the filter 12 via the positive electrode lead 5, and the negative electrode 1 serves as the negative electrode terminal via the negative electrode lead 6. Is joined to the bottom.
- the filter 12 is connected to an inner cap 13, and the protrusion of the inner cap 13 is joined to a metal valve plate 14. Further, the valve plate 14 is connected to a terminal plate 8 that also serves as a positive electrode terminal. The terminal plate 8, the valve plate 14, the inner cap 13, and the filter 12 are integrated to seal the opening of the battery case 7 via the gasket 11.
- valve body 14 When an internal short circuit or the like occurs in the unit cell 100 and the pressure in the unit cell 100 increases, the valve body 14 swells toward the terminal plate 8 and the inner cap 13 and the valve body 14 are disconnected from each other. Is cut off. When the pressure in the unit cell 100 further increases, the valve body 14 is broken. Thereby, the gas generated in the unit cell 100 is discharged to the outside through the through hole 12 a of the filter 12, the through hole 13 a of the inner cap 13, the tear of the valve element 14, and the opening 8 a of the terminal plate 8. Is done.
- the safety mechanism for discharging the gas generated in the unit cell 100 to the outside is not limited to the structure shown in FIG.
- FIG. 2 is a cross-sectional view schematically showing the configuration of the battery module 200 in the present embodiment.
- the battery module 200 includes one or a plurality of battery blocks.
- the unit cells 100 in one battery block are connected in parallel to each other.
- FIG. 2 shows a schematic cross section of one battery block portion in which a plurality of unit cells 100 are arranged and connected in parallel (the cross section of the unit cells is easy to see without hatching).
- the battery block in the battery module 200 has a configuration in which a plurality of unit cells 100 are accommodated in the container 20. Each unit cell 100 is inserted into a cylindrical through hole formed in the cooling block 24 housed in the container 20.
- the unit cell 100 includes an opening 8 a that discharges gas generated in the unit cell 100 to the outside of the cell.
- the container 20 includes an accommodating portion 31 that accommodates the plurality of unit cells 100 by a flat plate (plate-shaped member) 30 disposed on one end side (in the present embodiment, the positive electrode terminal 8 side) of the plurality of unit cells 100. It is partitioned into an exhaust path portion 32 that exhausts the gas discharged from the open portion 8 a of the unit cell 100 to the outside of the container 20.
- the open portion 8 a of the unit cell 100 communicates with the exhaust path portion 32 through an opening 30 a formed in the flat plate 30.
- the exhaust path portion 32 is formed between the flat plate 30 and the outer plate 21 of the container 20.
- the gas discharged from the open portion 8 a of the unit cell 100 is discharged to the exhaust path portion 32 through the opening portion 30 a formed in the flat plate 30, and then is discharged from the container 20 through the discharge port 22 provided in the container 20. To be discharged.
- the accommodating portion 31 is sealed by the flat plate 30. . Therefore, the gas discharged from the open part 8 a of the unit cell 100 to the exhaust path part 32 through the opening part 30 a of the flat plate 30 does not enter the accommodating part 31.
- FIG. 3 schematically shows a state in which the battery pack 300 according to the present embodiment is viewed from above with the upper lid of the case 40 removed.
- the battery pack 300 houses a plurality of battery modules 200, 200,... (Six here) in a case 40, and a gas discharge duct 42 is attached.
- the exhaust path portions 32 of the battery modules 200, 200,... are connected to the gas exhaust duct 42 via the exhaust ports 22, respectively, and the gas generated from any of the unit cells 100 is It is discharged from the exhaust path portion 32 to the outside of the battery pack 300 through the discharge port 22 and the gas discharge duct 42.
- the outlet 44 of the gas discharge duct 42 is arranged at a position where it is safe even if the gas is discharged.
- the battery pack 300 when the battery pack 300 is mounted on an electric vehicle, the battery pack 300 is disposed between the crew cabin and the outer plate, or is disposed below the vehicle body so that the outlet 44 faces the ground. By arranging in this way, it is safe for the crew and people near the car to avoid hitting the combustibles in the car with gas.
- the installation position of the outlet 44 of the gas discharge duct 42 differs depending on the equipment or apparatus using the battery pack 300 or the installation location of the battery pack 300.
- a lid portion 51 made of a waterproof member is installed as shown in FIG.
- the lid 51 is a sheet-like member, and closes the outlet 44 in a flat state.
- the periphery of the sheet is disposed so as to cover the vicinity of the outer periphery of the outlet 44 of the gas discharge duct 42, and the lid 51 is fixed to the gas discharge duct 42 by pressing the portion with a ring-shaped pressing member 45.
- the lid 51 prevents the gas discharge duct 42 from entering water from the outside into the battery pack 300. Further, when the lid 51 is a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX, condensation in the battery pack 300 can be prevented.
- An opening member 61 is installed near the outlet 44 in the gas discharge duct 42.
- the opening member 61 has a conical shape, and is supported by the support portion 62 so that the apex is directed to the lid portion 51 and the central axis is substantially orthogonal to a flat portion that closes the outlet 44 of the lid portion 51.
- the gas is discharged from the unit cell 100 at a speed close to the speed of sound.
- the gas reaches the outlet 44 through the gas discharge duct 42, the pressure of the gas is received by the conical inner surface of the opening member 61, and the support portion 62 is broken by the force, and the opening member 61 collides with the lid portion 51.
- the support portion 62 has a strength that does not break or deform in the event of an earthquake or the vibration of a car during traveling.
- the gas generated from the unit cell 100 is high temperature and is generated in a large amount as compared with the capacity of the exhaust path 32 in the battery pack 300, it is preferable to quickly discharge the gas to the outside of the battery pack 300.
- the hole is opened in the lid 51 as soon as the gas reaches the lid 51, the gas is quickly discharged to the outside.
- the lid 51 is provided so as to seal the outlet 44 of the gas discharge duct 42 and the opening member 61 is also provided, thereby reliably preventing water from entering the discharge duct 42 and the battery pack 300 from the outside.
- the gas generated from the unit cell 100 can be quickly discharged to the outside.
- the outlet 44 of the gas discharge duct 42 is set to a predetermined place as described above, the gas can be safely discharged. Note that the installation location of the outlet 44 of the gas discharge duct 42 varies depending on the equipment and installation location where the battery pack 300 is used.
- the unit cell 100 from which the gas has been discharged needs to be replaced together with the battery module 200. At that time, the gas discharge duct 42 is also replaced together to renew the lid 51 and the opening member 61.
- FIG. 5 shows a lid 52 and an opening member according to the first modification of the present embodiment. Other than the lid 52 and the opening member, it is as described above. In the first modification, the lid 52 closes and seals the outlet 44 of the gas discharge duct 42.
- the lid 52 is made of the same waterproof material as the lid 51 described above. The material of the lid 52 may be a waterproof and moisture permeable member.
- one end of the lid portion 52 is fixed to the gas discharge duct 42 by the first fixing member 63, and another end portion of the lid portion 52 is fixed to the gas discharge duct 42 by the second fixing member 64.
- the first and second fixing members 63 and 64 keep the lid 52 firmly fixed in the extent of the earthquake or the vibration of the vehicle during traveling.
- the second fixing member 64 is deformed by the force, and the lid portion 52 can be moved outward from the gas discharge duct 42.
- the part fixed by the 1st fixing member 63 becomes a fulcrum, and the cover part 52 moves so that a door may open outside by the pressure of gas, and discharges gas outside.
- the first and second fixing members 63 and 64 are opening members.
- water can be reliably prevented from entering the discharge duct 42 and the battery pack 300 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside. Further, by setting the outlet 44 of the gas discharge duct 42 to a predetermined place as described above, the gas can be safely discharged.
- the lid 52 may be formed by attaching a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX to a ring-shaped outer frame made of resin, metal, or the like, and making the center part a moisture-permeable member.
- the structure in which the second fixing member 64 fixes the lid portion 52 may be an engaging structure, a fitting structure, or an adhesive fixing structure. In addition to the deformation of the second fixing member 64 and the movement of the lid portion 52, the lid portion 52 can be moved by the disengagement of the engaging structure, or the other fixing structure is destroyed, thereby the lid portion. 52 may be movable.
- FIG. 6 shows a lid 52 and an opening member according to the second modification of the present embodiment. Other than the lid 52 and the opening member, it is as described above. In the second modification, the lid 52 closes and seals the outlet 44 of the gas discharge duct 42.
- the lid 52 is made of a waterproof material.
- the material of the lid 52 may be a waterproof and moisture permeable member.
- one end of the lid 52 is fixed to the gas discharge duct 42, and another end of the lid 52 is fixed to the gas discharge duct 42 by a fixing member 68.
- the fixing member 68 is made of a shape memory alloy or a bimetal whose shape changes when the temperature exceeds a certain temperature.
- the fixing member 68 remains firmly fixed to the lid 52 in the case of an earthquake or the vibration of the car during traveling. However, when the gas generated from the unit cell 100 reaches the lid portion 52, the fixing member 68 is deformed by the heat, and the lid portion 52 moves so as to open outward from the gas discharge duct 42 to discharge the gas to the outside. Let When the temperature reaches a certain level or more, the fixing member 68 is disengaged from the lid portion 52.
- the fixing member 68 is an opening member.
- the lid 52 may be made of a shape memory alloy or a bimetal whose shape changes when the temperature exceeds a certain temperature. When the gas generated from the unit cell 100 reaches the lid portion 52, the lid portion 52 is deformed so as to open from the gas discharge duct 42 to the outside by the heat, and the gas is discharged to the outside.
- water can be reliably prevented from entering the discharge duct 42 and the battery pack 300 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside. Further, by setting the outlet 44 of the gas discharge duct 42 to a predetermined place as described above, the gas can be safely discharged.
- the lid 52 may be formed by attaching a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX to a ring-shaped outer frame made of resin, metal, or the like, and making the center part a moisture-permeable member.
- a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX
- a ring-shaped outer frame made of resin, metal, or the like
- FIG. 7 shows a lid 51 and an opening member 65 according to Modification 3 of the present embodiment. Other than the opening member 65 is the same as in the first embodiment.
- the lid 51 closes the outlet 44 of the gas discharge duct 42 and seals it.
- the lid 51 is made of a waterproof material.
- the material of the lid part 51 may be a waterproof and moisture permeable member.
- a pendulum with a weight having a sharp tip at the tip of a stick is an opening member 65.
- One end of the rod is fixed to the inner wall of the gas discharge duct 42 and remains fixed in the event of an earthquake or the vibration of the vehicle during traveling.
- the pressure of the gas generated from the unit cell 100 is applied to the opening member 65, the fixed state of the rod is released, the pendulum is shaken, the pointed end of the weight breaks through the lid portion 51, and the gas is discharged to the outside. .
- water can be reliably prevented from entering the discharge duct 42 and the battery pack 300 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside. Further, by setting the outlet 44 of the gas discharge duct 42 to a predetermined place as described above, the gas can be safely discharged.
- FIG. 11 shows a battery pack 301 according to the fourth modification of the present embodiment.
- FIG. 11 is a partial cross-sectional view in which the case 40 is broken when the battery pack 301 is viewed from the side.
- the discharge ports of the battery modules 200, 200,... are connected to and communicated with an internal duct 70 provided in the battery pack 301. It is connected to the duct 42.
- the outlet 44a of the gas exhaust duct 42 is sealed by a lid portion using a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX, and there is an opening member for opening the lid portion.
- any one of the above-described embodiment and each modified example can be applied.
- water can be reliably prevented from entering the discharge duct 42 and the battery pack 301 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside.
- FIG. 12 shows a battery pack 302 according to Modification 5 of the present embodiment.
- FIG. 12 is a partial cross-sectional view in which the case 40 is broken when the battery pack 302 is viewed from the side.
- a short module discharge duct 242 protrudes from the discharge port of each battery module 200, 200,.
- the outlet 244 of the module discharge duct 242 exists in the battery pack 302 and is sealed by a lid portion using a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX.
- the lid may be opened by the opening member as described above, or may be opened by the pressure / temperature of the gas without the opening member.
- the outlet 44a of the gas discharge duct 42 of the battery pack 302 is also sealed by a lid portion using a sheet member made of a waterproof and moisture-permeable member such as GORE-TEX, and there is an opening member for opening the lid portion. Yes. Furthermore, any one of the above-described embodiment and each modification can be applied to the lid and the opening member. Note that the outlet 244 may be left open without providing a lid at the outlet 244 of the module discharge duct 242.
- water can be reliably prevented from entering the discharge duct 42, the battery pack 302, and the battery module 200 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a unit cell 100 used in the battery module according to the second embodiment. Since the unit cell 100 is the same as the unit cell 100 of the first embodiment, the structure and the like are as described above.
- FIG. 2 is a cross-sectional view schematically showing the configuration of the battery module 200 in the present embodiment. Since the battery module 200 is the same as the battery module 200 of the first embodiment, the structure and the like are as described above.
- FIG. 3 schematically shows a state in which the battery pack 300 according to the present embodiment is viewed from above with the upper lid of the case 40 removed. Since the battery pack 300 is the same as the battery pack 300 of the first embodiment except for the lid and the opening member, the structure and the like except for these two are as described above.
- the lid portion 53 of the present embodiment is in the middle of the exhaust path of the gas exhaust duct 42 and to the case 40 of the battery pack 300. It is installed in a close part.
- the lid 53 is made of a waterproof and moisture permeable membrane made of resin, for example, a GORE-TEX membrane.
- the lid 53 is fixed inside the gas discharge duct 42 by a ring-shaped pressing member 48 and seals the gas discharge duct 42. This can reliably prevent water from entering the battery pack 300 from the outside. Further, since the moisture in the battery pack 300 becomes water vapor and passes through the lid portion 53 and goes out of the battery pack 300, dew condensation inside the battery pack 300 can be prevented.
- the lid portion 53 of the present embodiment is installed in a portion near the case 40 of the battery pack 300, the distance from the unit cell 100 is smaller than the lid portions 51 and 52 of the first embodiment. Therefore, the gas generated from the unit cell 100 collides with the lid 53 while maintaining a relatively high temperature. Due to the temperature of the gas, the material of the lid portion 53 is melted or the strength of the material is lowered, and the material of the lid portion 53 is broken by the gas pressure from the portion where the material is melted or the strength is lowered. The discharge route is opened. Thus, after the gas is generated, it is quickly discharged to the outside of the battery pack 300.
- water can be reliably prevented from entering the battery pack 300 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside. Further, the gas can be safely discharged by setting the outlet location of the gas discharge duct 42 to the predetermined location as described above.
- the structure is simpler than that of the first embodiment, and the cost can be reduced.
- This embodiment is preferably applied when there is no place where water accumulates in the middle of the gas discharge duct 42, for example, when the gas discharge duct 42 extends horizontally or in a combination of horizontal and downward.
- a lid is provided at the outlet 44 as in the first embodiment, there may be a place where water accumulates in the middle of the gas discharge duct 42.
- FIG. 9 shows a gas discharge duct 43 and a lid portion 54 according to the first modification of the present embodiment. Except for the gas discharge duct 43 and the lid 54, the structure is the same as that of the second embodiment, and the same members are used. In this modification, the lid portion 54 closes and closes the outlet 44 ′ of the gas discharge duct 43.
- the lid portion 54 is made of a waterproof and moisture-permeable membrane made of the same resin as the lid portion 53 described above, and is fixed to the gas discharge duct 43 by a ring-shaped pressing member 45 ′.
- the inner diameter of the gas discharge duct 43 is reduced in the vicinity of the outlet 44 ', and the gas discharge passage is narrowed. Therefore, when gas is generated from the unit cell 100, the gas flow velocity increases at the outlet 44 'of the gas discharge duct 43, a large impact force is applied to the lid portion 54, and the lid portion 54 is broken. In this way, the gas is quickly discharged to the outside.
- water can be reliably prevented from entering the discharge duct 43 and the battery pack 300 from the outside, and the gas generated from the unit cell 100 can be quickly discharged to the outside. Further, by setting the outlet 44 'of the gas discharge duct 43 to a predetermined place as described above, the gas can be safely discharged. Further, since no opening member is required, it can be manufactured with a simple structure and at a low cost.
- FIG. 13 shows a battery pack 304 including a gas discharge duct 43 ′ and a lid portion 54 according to Modification 2 of the present embodiment.
- gas discharge duct 43 ' it is the same structure as the above-mentioned modification 1, and uses the same member.
- the discharge duct 43 ' is bent a plurality of times in the vertical direction to form a zigzag structure. And in the discharge duct 43 ', there are two water reservoirs 71 and 72 located on the lower side as compared with the front and rear thereof. The water reservoirs 71 and 72 exist at the lowest position including the vicinity thereof. If the discharge duct 43 ′ is viewed as a curve, the water reservoirs 71 and 72 hit the minimum value.
- the inner diameter of the gas discharge duct 43 ′ is smaller in the vicinity of the outlet 44 b in this modification, and the gas discharge passage is narrowed. Accordingly, the gas flow velocity increases at the outlet 44b of the gas discharge duct 43 ', a large impact force is applied to the lid portion 54, and the lid portion 54 is broken. In this way, the gas is quickly discharged to the outside.
- the present modification also has the effect of the first modification.
- Embodiment 3 The battery pack according to Embodiment 3 uses a battery module 200 ′ shown in FIG. As shown in FIG. 3, six battery modules 200 ′ are accommodated in the case 40.
- the unit cell has the structure shown in FIG.
- a lid portion 56 made of a waterproof member is attached to the container of the battery module 200 '. That is, a hole is made in the container of the battery module 200 ′, and the hole is sealed by the lid portion 56. Therefore, the gas exhaust duct 42 is not attached with a lid. Since the lid portion 56 is attached to the battery module 200 ′, the gas generated from the unit cell 100 collides with the lid portion 56 at a high temperature and at a high speed. The gas is allowed to pass through the gas discharge duct 42 by being melted or broken by heat or pressure.
- the lid portion 56 can reliably prevent water from entering the battery module 200 ′ from the outside. Further, if the lid portion 56 is made of a waterproof and moisture-permeable member, it is possible to prevent condensation inside the battery module 200 ′. Since an opening member is unnecessary, it can be manufactured at a low cost with a simple structure. Further, by setting the installation location of the outlet 44 of the gas exhaust duct 42 to the predetermined location as described above, the gas can be safely discharged.
- FIG. 14 shows a battery pack 303 according to a modification of the present embodiment.
- a structure similar to that of the battery module 200 ′ shown in FIG. 10 is applied to the battery pack 303.
- the battery module accommodated in the battery pack 303 may be the one shown in FIG. 2 or the one shown in FIG.
- a lid portion 55 made of a waterproof member is attached to the case of the battery pack 303. That is, a hole is formed in the case of the battery pack 303 and the hole is sealed by the lid portion 55. Since the lid portion 55 is directly attached to the battery pack 303, the gas generated from the unit cell 100 collides with the lid portion 55 at a high temperature and at a high speed. The gas can be quickly discharged from the battery pack 303 by melting and breaking with heat or pressure.
- the lid portion 55 used here is a disk-shaped member in which a sheet-like waterproof and moisture-permeable member 57 is supported by a donut-shaped support member 58.
- the battery pack 303 is fixed to the case by an engaging portion 59 protruding from the outer edge of the support member 58.
- the lid 55 can reliably prevent water from entering the battery pack 303 from the outside, and can prevent condensation inside the battery pack 303. Since an opening member is unnecessary, it can be manufactured at a low cost with a simple structure.
- the above embodiment is an exemplification, and the present invention is not limited by these examples.
- the structure of the opening member and the opening mechanism are not particularly limited, and any member may be used as long as the lid portion can be reliably opened by gas outflow pressure, gas flow, heat, or the like.
- the configurations of the battery module and the battery pack are not limited to the above example.
- the number of battery modules included in the battery pack may be more or less than six.
- the arrangement of the battery modules in the battery pack may be one row or three or more rows. Further, the battery modules may be stacked in two or more stages.
- a substance that generates heat by gas pressure or heat to break or melt the lid portion may be used as an opening member, and may be installed in the vicinity of the lid portion or in contact with the lid portion.
- the method of fixing the lid to the gas discharge duct is not limited to fixing by the pressing member, and may be fixed by bonding with an adhesive or other fixing methods.
- the battery pack in FIG. 11 or 12 may be used in the second and third embodiments and their modifications. Moreover, you may use the cover part 55 shown in FIG. 15 for Embodiment 1, 2, and those modifications.
- the installation location of the set of the lid and the opening member in the first embodiment is not limited to the vicinity of the outlet 44 of the gas discharge duct 42, and may be in the middle of the gas discharge path.
- a resin film having a low melting point that is a waterproof material such as a polyethylene film or a polypropylene film may be used as the lid.
- a part of the waterproof and moisture-permeable film may be replaced with such a resin film, and the resin film portion may be broken or melted.
- each duct is attached, the above embodiment can be applied as it is.
- the gas discharge ducts attached to the respective battery packs may be integrated into one on the way to form a collective duct, and a lid may be provided on the collective duct.
- thermo sensor heat sensor, pressure sensor, gas sensor, etc.
- the thermal sensor detects the generation of gas by temperature. Therefore, the operation of the opening member (for example, the operation of the opening member 65 of the third modification of the first embodiment) may be performed by a signal from the sensor that detects gas generation.
- a thermal fuse may be provided, and the opening member may be operated by a signal generated when the thermal fuse is blown.
- the battery pack according to the present invention can reliably prevent water from entering from the outside, and is useful as a power source for various devices and apparatuses.
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Abstract
Description
防水透湿性部材とは、液体としての水は通過させないが気体としての水(水蒸気)は通過させる部材であり、ガス排出ダクトの途中に蓋部として用いられると、電池パックの外部から内部へ侵入しようとする水はシャットアウトするが、電池パック内部の水蒸気は外部へと放出される部材であって、例えばGORE-TEX(登録商標)、エントラント(登録商標)、DRY-TEC(登録商標)等を挙げることができる。
<素電池>
図1は、実施形態1における電池ブロックに使用する電池100の構成を模式的に示した断面図である。なお、本実施形態の電池ブロックに使用する電池は、ノート型パソコン等の携帯用電子機器の電源として単体でも使用できる電池であってもよい(以下、電池ブロックに使用する電池を、「素電池」と呼ぶ)。この場合、高性能の汎用電池を、電池ブロックの素電池として使用することができるため、電池ブロックの高性能化、低コスト化をより容易に図ることができる。
図2は、本実施形態における電池モジュール200の構成を模式的に示した断面図である。本実施形態においては、電池モジュール200は、電池ブロックを1個又は複数並べたものである。また一つの電池ブロック中の素電池100同士は互いに並列に接続されている。
図3は、本実施形態に係る電池パック300を、ケース40の上蓋を取り外して上から見た状態を模式的に示したものである。電池パック300は複数の電池モジュール200,200,…(ここでは6つ)をケース40に収納しており、ガス排出ダクト42が取り付けられている。
図5に本実施形態の変形例1に係る蓋部52および開通部材を示す。蓋部52と開通部材以外は上述の通りである。変形例1においては、蓋部52がガス排出ダクト42の出口44を塞いで密閉している。蓋部52は上記の蓋部51と同じ防水性素材からできている。蓋部52の素材は防水透湿性部材であってもよい。
図6に本実施形態の変形例2に係る蓋部52および開通部材を示す。蓋部52と開通部材以外は上述の通りである。変形例2においては、蓋部52がガス排出ダクト42の出口44を塞いで密閉している。蓋部52は防水性素材からできている。蓋部52の素材は防水透湿性部材であってもよい。
図7に本実施形態の変形例3に係る蓋部51および開通部材65を示す。開通部材65以外は上述の実施形態1の通りである。変形例3は、蓋部51がガス排出ダクト42の出口44を塞いで密閉している。蓋部51は防水性素材から作成されている。蓋部51の素材は防水透湿性部材であってもよい。
図11に本実施形態の変形例4に係る電池パック301を示す。図3とは異なり、図11は電池パック301を横から見て、ケース40を破断させた一部断面図である。本変形例では、各電池モジュール200,200,…の排出口が、電池パック301内に設けられた内部ダクト70に連結・連通しており、内部ダクト70の出口は、電池パック301のガス排出ダクト42に繋がっている。ガス排出ダクト42の出口44aは、GORE-TEXのような防水透湿性部材からなるシート部材を用いた蓋部により密閉されており、この蓋部を開通させる開通部材が存している。この蓋部および開通部材は、上述の本実施形態及び各変形例のいずれかのものを適用することができる。
図12に本実施形態の変形例5に係る電池パック302を示す。図3とは異なり、図12は電池パック302を横から見て、ケース40を破断させた一部断面図である。本変形例では、各電池モジュール200,200,…の排出口から短いモジュール用排出ダクト242が突き出している。モジュール用排出ダクト242の出口244は、電池パック302内に存しており、GORE-TEXのような防水透湿性部材からなるシート部材を用いた蓋部により密閉されている。この蓋部は上記のような開通部材により開通させられてもよいし、開通部材なしでガスの圧力・温度により蓋部を開通させてもよい。電池パック302のガス排出ダクト42の出口44aも、GORE-TEXのような防水透湿性部材からなるシート部材を用いた蓋部により密閉されており、この蓋部を開通させる開通部材が存している。さらに上記の蓋部および開通部材は、上述の本実施形態及び各変形例のいずれかのものを適用することができる。なお、モジュール用排出ダクト242の出口244に蓋部を設けないで出口244を開口させたままであっても構わない。
実施形態2に係る電池パックを図1~3、8を基に説明する。
図1は、実施形態2における電池モジュールに使用する素電池100の構成を模式的に示した断面図である。なお、この素電池100は実施形態1の素電池100と同じであるので、構造等の説明は上述の通りである。
図2は、本実施形態における電池モジュール200の構成を模式的に示した断面図である。なお、この電池モジュール200は実施形態1の電池モジュール200と同じであるので、構造等の説明は上述の通りである。
図3は、本実施形態に係る電池パック300を、ケース40の上蓋を取り外して上から見た状態を模式的に示したものである。なお、この電池パック300は実施形態1の電池パック300と、蓋部及び開通部材を除いて同じであるので、これら2つを除いた構造等の説明は上述の通りである。
図9に本実施形態の変形例1に係るガス排出ダクト43および蓋部54を示す。ガス排出ダクト43および蓋部54以外は上述の実施形態2と同じ構造であり、同じ部材を用いている。この変形例は、蓋部54がガス排出ダクト43の出口44’を塞いで密閉している。蓋部54は上記の蓋部53と同じ樹脂からなる防水透湿性のメンブレンからできていて、リング状の押さえ部材45’によりガス排出ダクト43に固定されている。
図13に本実施形態の変形例2に係るガス排出ダクト43’及び蓋部54を備えた電池パック304を示す。なお、ガス排出ダクト43’以外は上述の変形例1と同じ構造であり、同じ部材を用いている。
実施形態3に係る電池パックは、図10に示す電池モジュール200’を用いている。そして、図3に示す通り、ケース40の中に6つの電池モジュール200’が収納されている。なお、素電池は図1に示す構造を有している。
図14に本実施形態の変形例に係る電池パック303を示す。本変形例では、図10に示された電池モジュール200’と同様の構造が電池パック303に適用されている。なお、電池パック303内に収容されている電池モジュールは図2に示されているものでもよいし、図10に示されているものでもよい。
上記の実施形態は例示であり、これらの例によって本発明は限定されない。開通部材の構造、開通機構も特に限定されず、ガスの流出圧力やガス流、熱などによって蓋部を確実に開口できるものであればどのようなものでも構わない。電池モジュールや電池パックの構成も上記の例に限定されず、例えば、電池パックに含まれる電池モジュールの数は6よりも多くても良いし少なくてもよい。電池パック内の電池モジュールの配置も、1列でもよいし、3列以上でもよい。また、2段以上に電池モジュールを積み重ねてもよい。
42、43、43’ ガス排出ダクト
44、44’、44a、44b 出口
51,52,53,54,55,56 蓋部
61,65 開通部材
63 第1固定部材
64 第2固定部材
68 固定部材
71,72 水溜部
100 素電池
200 電池モジュール
300,301,302,303,304 電池パック
Claims (7)
- リチウムイオン二次電池である複数の素電池と、
前記素電池に隣接し、該素電池から発生するガスを通過させる排気経路部と、
前記複数の素電池と前記排気経路部とを収納するケースと、
前記ケースに取り付けられ、前記排気経路部を通過したガスを外部へ放出するガス排出ダクトと
を備え、
前記ガス排出ダクトは、出口又は排出経路の途中に防水部材からなる蓋部が配置されて、該蓋部によって密閉されており、
前記蓋部を開封して前記ガス排出ダクトを開通させる開通部材を更に備えており、
前記開通部材は、前記素電池から発生する前記ガスによって、前記蓋部を開封して前記ガス排出ダクトを開通させるように作動する、電池パック。 - リチウムイオン二次電池である複数の素電池と、
前記素電池に隣接し、該素電池から発生するガスを通過させる排気経路部と、
前記複数の素電池と前記排気経路部とを収納するケースと、
前記ケースに取り付けられ、前記排気経路部を通過したガスを外部へ放出するガス排出ダクトと
を備え、
前記ガス排出ダクトは、出口又は排出経路の途中に防水部材からなる蓋部が配置されて、該蓋部によって密閉されており、
前記蓋部は、前記素電池から発生する前記ガスによって開口する、電池パック。 - リチウムイオン二次電池である複数の素電池と、
前記素電池に隣接し、該素電池から発生するガスを通過させる排気経路部と、
前記複数の素電池と前記排気経路部とを収納するケースと
を備え、
前記ケースには、前記排気経路部を通過したガスを外部へ放出するガス排出孔が設けられており、
前記ガス放出孔は、防水部材からなる蓋部によって密封されており、
前記蓋部は、前記素電池から発生する前記ガスによって開口する、電池パック。 - 前記蓋部は少なくとも一部が防水透湿性部材からなる、請求項1から3のいずれか一つに記載されている電池パック。
- 前記開通部材は、前記素電池から発生する前記ガスの熱によって所定温度以上になると形状が変化することにより、前記蓋部を開封して前記ガス排出ダクトを開通させる、請求項1に記載されている電池パック。
- 前記ガスの発生を検出する熱センサーを更に有し、前記センサーの信号によって前記開通部材を作動させる、請求項1に記載されている電池パック。
- 前記ガス排出ダクトは上下方向において複数回屈曲しており、排出経路の途中にはガス排出方向における前後の部分よりも下の位置に存する水溜部を有している、請求項1から3のいずれか一つに記載されている電池パック。
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JP2012515263A JP5619154B2 (ja) | 2010-11-30 | 2011-11-17 | 電池パック |
EP11845828.0A EP2648242B1 (en) | 2010-11-30 | 2011-11-17 | Battery pack |
KR1020127014328A KR101289935B1 (ko) | 2010-11-30 | 2011-11-17 | 전지 팩 |
US13/515,672 US20120263982A1 (en) | 2010-11-30 | 2011-11-17 | Battery pack |
CN201180006621.5A CN102714289B (zh) | 2010-11-30 | 2011-11-17 | 电池组 |
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EP (1) | EP2648242B1 (ja) |
JP (1) | JP5619154B2 (ja) |
KR (1) | KR101289935B1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP2648242B1 (en) | 2020-06-03 |
US20120263982A1 (en) | 2012-10-18 |
KR20120102677A (ko) | 2012-09-18 |
KR101289935B1 (ko) | 2013-07-25 |
JPWO2012073438A1 (ja) | 2014-05-19 |
CN102714289A (zh) | 2012-10-03 |
EP2648242A4 (en) | 2014-06-18 |
EP2648242A1 (en) | 2013-10-09 |
CN102714289B (zh) | 2015-08-26 |
JP5619154B2 (ja) | 2014-11-05 |
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