JP5507173B2 - Battery module and battery pack using the same - Google Patents

Battery module and battery pack using the same Download PDF

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JP5507173B2
JP5507173B2 JP2009219987A JP2009219987A JP5507173B2 JP 5507173 B2 JP5507173 B2 JP 5507173B2 JP 2009219987 A JP2009219987 A JP 2009219987A JP 2009219987 A JP2009219987 A JP 2009219987A JP 5507173 B2 JP5507173 B2 JP 5507173B2
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opening
exhaust duct
battery
battery module
gas
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JP2011070871A (en
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裕史 高崎
俊介 安井
俊樹 糸井
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パナソニック株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

  The present invention relates to a battery module configured by combining a plurality of unit cells and a battery pack configured by combining a plurality of such battery modules, and more particularly to a structure for exhausting gas generated when a failure occurs in a unit cell. .

  In recent years, demand for secondary batteries such as nickel metal hydride, nickel cadmium, and lithium ion that can be repeatedly used is increasing from the viewpoint of resource saving and energy saving. Among these, lithium ion secondary batteries are characterized by high electromotive force and high energy density while being lightweight. For this reason, there is an increasing demand for power sources for driving various types of portable electronic devices such as mobile phones, digital cameras, video cameras, laptop computers, and mobile communication devices.

On the other hand, in order to reduce the amount of fossil fuel used and the amount of CO 2 emitted, there is an increasing expectation for a battery module as a power source for driving a motor of an automobile or the like. This battery module is composed of two or more single cells in order to obtain a desired voltage and capacity. Further, a battery pack is configured by combining two or more battery modules.

  As the capacity of the unit cell increases, the unit cell itself may generate heat and become high temperature depending on the form of use. Therefore, the safety of the battery module using the assembled battery in which the cells are assembled is more important than the safety of the unit cell itself. That is, in the unit cell, the internal pressure increases due to gas generated by overcharge, overdischarge, internal short circuit or external short circuit, and in some cases, the outer case of the unit cell may burst. Therefore, in general, a single cell is provided with a vent mechanism for venting gas, a safety valve, and the like to release the internal gas. At this time, smoke may be emitted due to ignition of the exhausted gas, or in rare cases, ignition may occur, and there is a problem in reliability and safety. In particular, in a battery module in which a plurality of unit cells are integrated, there is a possibility that abnormal heating of one unit cell may cause abnormal heating to the surrounding unit cells or trigger a chain of fires to expand failures. High and it is important to prevent it.

  As means for coping with the above problems, for example, a configuration is disclosed in which an exhaust duct is provided in the battery module and the generated gas is discharged to the outside through the exhaust duct. (For example, patent document 1). In addition, a configuration is disclosed in which a thermal expansion member is disposed in the gap between the battery module case and the unit cell, and the unit cell that has generated heat is isolated by expansion of the thermal expansion member when the unit cell generates heat and ignites. (For example, Patent Document 2).

JP 2008-117765 A International Publication No. 2008/047721

  However, according to Patent Document 1, since the exhaust duct is provided as a separate member in the battery module, the configuration in the battery module becomes complicated. Furthermore, it leads to an increase in the size of the battery module itself, and it is difficult to downsize the module itself.

  According to Patent Document 2, the unit cell itself that has generated heat and ignited is isolated, but since the inside of the battery pack becomes high temperature, there is a concern that the unit cell may be burned into another unit cell.

  The present invention solves the above-described problems, and an object of the present invention is to provide a battery module that lowers the high-temperature gas generated due to a failure of a cell to a safe temperature and exhausts the gas to the outside.

  In order to achieve the above object, the battery module of the present invention includes a unit cell, a casing, and an exhaust duct. A housing opening is formed in the housing and a unit cell is accommodated. The exhaust duct has a first opening, a second opening having a larger area than the first opening, and a cavity. The cavity is connected from the first opening to the second opening. The first opening is connected to the housing through the housing opening. With this configuration, even if a high-temperature gas is discharged from the unit cell, this gas expands while passing through the exhaust duct and the temperature decreases. As a result, even if the gas whose temperature has dropped through the exhaust duct is discharged, it does not ignite.

  In the battery module of the present invention and the battery pack using the battery module, even if a malfunction occurs in the internal unit cell, the gas discharged from the unit cell can be safely discharged out of the battery module.

Sectional drawing of the cell accommodated in the battery module in embodiment of this invention (A) Appearance perspective view of battery module according to embodiment of the present invention, (b) 2B-2B cross-sectional view of FIG. 2 (a), (c) Enlarged cross-sectional view of section 2C of FIG. 2 (b) The exploded perspective view of the battery module in an embodiment of the invention (A) Schematic diagram of the battery pack in the embodiment of the present invention, (b) Enlarged sectional view of 4B part of FIG. 4 (a) (A) In the battery module according to the embodiment of the present invention, a cross-sectional view for explaining the state of exhaust of gas ejected when abnormal heating or the like occurs in one of the single cells, (b) in FIG. 5 (a) 5B is an enlarged cross-sectional view, (c) an enlarged cross-sectional view around the exhaust duct of FIG. 5 (a) Sectional drawing of the inner wall shape of the other exhaust duct in embodiment of this invention

  1st invention of this invention is a battery module which has a cell, a housing | casing, and an exhaust duct. A housing opening is formed in the housing and a unit cell is accommodated. The exhaust duct has a first opening, a second opening having a larger area than the first opening, and a cavity. The cavity has a shape that connects the first opening to the second opening. The first opening is connected to the housing through the housing opening. With this configuration, even if a high-temperature gas is discharged from the unit cell, this gas expands while passing through the exhaust duct and the temperature decreases. As a result, even if the gas whose temperature has dropped through the exhaust duct is discharged, it does not ignite.

  According to a second aspect of the present invention, in the first aspect of the present invention, a main body having a plurality of single cells, a housing for housing the plurality of single cells, having an open end, and a lid covering the open end of the main body. The battery module further includes a wiring board in which a plurality of single cells are connected between the lid and the open end. The exhaust duct is connected to a space formed between the lid and the wiring board through the first opening. When the battery module has a plurality of batteries in this way, the cells are connected by the substrate, and the gas is surely exhausted by connecting the exhaust duct to the space formed between the lid and the substrate. Can do.

  A third invention of the present invention is the battery module according to the first or second invention, wherein the battery module has a valve that is provided on the side near the second opening of the exhaust duct and prevents a gas flow from the outside into the exhaust duct. is there. This valve prevents the gas from igniting due to the mixture of the hot gas and the outside air. Therefore, it is possible to reliably prevent the ignition of gas.

  According to a fourth invention of the present invention, in any one of the first to third inventions, the deformable movable portion that makes the direction of the exhaust duct relative to the housing variable is closer to the first opening of the exhaust duct. It is the battery module provided in. When a battery pack is constituted by a plurality of battery modules by the movable part and the exhaust ducts of the respective battery modules are further connected, the degree of freedom of arrangement of the battery modules is increased.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the first opening and the second opening of the exhaust duct in the direction passing through the first opening and the second opening. The cross section of the inner side surface connecting the two is a battery module having a convex shape toward the inside of the cavity. By forming the exhaust duct in a trumpet shape in this way, the flow rate of gas near the first opening is increased, and the exhaust efficiency is increased.

  A sixth invention of the present invention is a battery pack comprising a plurality of battery modules according to any one of the first to fifth inventions, and a connecting pipe connecting each exhaust duct of the plurality of battery modules. . In this configuration, even if gas is generated in any battery module by the connecting pipe, it can be led to the safest place and discharged to the outside. Further, when each battery module is provided with a valve, even if the gas is discharged from any one of the battery modules, the gas does not enter the other battery module.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the contents described below as long as it is based on the basic characteristics described in this specification. Further, as a battery, a non-aqueous electrolyte secondary battery such as a cylindrical lithium ion (hereinafter referred to as “battery”) will be described as an example, but it is needless to say that the battery is not limited thereto.

  FIG. 1 is a cross-sectional view of a unit cell housed in a battery module according to an embodiment of the present invention. A cylindrical unit cell 40 includes, for example, a positive electrode 1 having a positive electrode lead 8 made of aluminum and a negative electrode 2 having a negative electrode lead 9 made of, for example, copper opposite to the positive electrode 1 at one end. A rotated electrode group 4 is provided. Then, insulating plates 10 a and 10 b are mounted on the upper and lower sides of the electrode group 4 and inserted into the case 5, the other end of the positive electrode lead 8 is used as the sealing plate 6, and the other end of the negative electrode lead 9 is used as the bottom of the case 5. Weld to. Furthermore, a nonaqueous electrolyte (not shown) that conducts lithium ions is injected into the case 5, and the open end of the case 5 is connected to the positive electrode cap 16 constituting one electrode portion via the gasket 7, the PTC element. The current blocking member 18 and the sealing plate 6 are caulked. And the positive electrode 1 is comprised from the positive electrode collector 1a and the positive electrode layer 1b containing a positive electrode active material.

  The positive electrode cap 16 is provided so as to protrude from the upper surface 5A of the open end portion of the case 5, and an open portion 17 for removing gas generated by opening a vent mechanism 19 such as a safety valve due to a failure of the electrode group 4 is provided on the positive electrode cap 16. It is provided on the side. The amount of protrusion of the positive electrode cap 16 from the upper surface 5A is, for example, about the thickness of the wiring board described below.

Here, the positive electrode layer 1b includes, for example, lithium-containing composite oxide such as LiCoO 2 , LiNiO 2 , Li 2 MnO 4 , or a mixture or composite compound thereof as a positive electrode active material. The positive electrode layer 1b further includes a conductive agent and a binder. Examples of the conductive agent include natural graphite and artificial graphite graphite, carbon blacks such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black. Examples of the binder include PVDF, polytetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, and polyimide. Further, as the positive electrode current collector 1a used for the positive electrode 1, aluminum (Al), carbon (C), conductive resin, or the like can be used.

As the non-aqueous electrolyte, a non-aqueous electrolyte solution in which a solute is dissolved in an organic solvent, or a so-called polymer electrolyte layer containing these and non-fluidized with a polymer can be applied. As the solute of the non-aqueous electrolyte, LiPF 6 , LiBF 4 , LiClO 4 , LiAlCl 4 , LiSbF 6 , LiSCN, LiCF 3 SO 3 , LiN (CF 3 CO 2 ), LiN (CF 3 SO 2 ) 2, etc. should be used. Can do. Furthermore, as an organic solvent, ethylene carbonate (EC), propylene carbonate, butylene carbonate, vinylene carbonate, dimethyl carbonate (DMC), diethyl carbonate, ethyl methyl carbonate (EMC), etc. can be used, for example.

The negative electrode current collector 11 of the negative electrode 2 is made of a metal foil such as stainless steel, nickel, copper, or titanium, or a thin film of carbon or conductive resin. As the negative electrode layer 15 of the negative electrode 2, a carbon material such as graphite can be used. Further, a negative electrode active material having a theoretical capacity density that reversibly occludes and releases lithium ions, such as silicon (Si) and tin (Sn), exceeding 833 mAh / cm 3 can also be used.

  Hereinafter, a battery module and a battery pack according to an embodiment of the present invention will be described in detail with reference to FIGS.

  2A is an external perspective view of the battery module according to the embodiment of the present invention, FIG. 2B is a cross-sectional view taken along line 2B-2B of FIG. 2A, and FIG. 2C is FIG. 2C is an enlarged cross-sectional view of a portion 2C. FIG. 3 is an exploded perspective view of the battery module according to the embodiment of the present invention. FIG. 4A is a schematic diagram of the battery pack in the embodiment of the present invention, and FIG. 4B is an enlarged cross-sectional view of a portion 4B of FIG. 4A, showing details around the exhaust duct. The battery module 100 includes an assembled battery 41 composed of a single cell 40, a lid 20, a main body 50, a wiring board 30, an exhaust duct 60, and a valve 63.

  The main body 50 is made of an insulating resin material such as polycarbonate resin. The lid 20 made of the same material is fitted to the main body 50 and covers the open end of the main body 50. The main body 50 and the lid 20 constitute a casing of the battery module 100.

  As shown in FIG. 3, the main body 50 includes an opening end on the side that fits with the lid 20, and has a storage portion 54 that stores the assembled battery 41 from the opening end side. At this time, when the battery has an outer diameter of 18 mm and a height of 65 mm, for example, the height of the storage portion 54 is about 65 mm plus the thickness of the connection plate 33.

  As shown in FIG. 2B, the lid 20 includes an exhaust chamber 24 formed by the outer peripheral wall 22 and a housing opening 26 provided in a part of the outer peripheral wall 22. An exhaust duct 60 is connected to the housing opening 26.

  As shown in FIG. 2B and FIG. 3, an assembled battery 41 composed of a plurality of unit cells 40 is accommodated in the main body 50. In the assembled battery 41, the positive caps 16 of the plurality of single cells 40 are arranged in the same direction, and the positive caps 16 are connected by connection terminals 32 of the wiring board 30. That is, the wiring board 30 connects a plurality of unit cells 40 between the lid 20 and the open end of the main body 50. On the other hand, the bottom part which is one electrode part (negative electrode side) of the unit cell 40 is connected by the connection plate 33. The negative electrode side is connected to a connection terminal 34 provided on the wiring board 30 via an extending portion 33 </ b> A extending from a part of the connection plate 33. Thus, in the assembled battery 41, the plurality of single cells 40 are electrically connected in parallel.

  As shown in FIG. 2C, the positive electrode cap 16 protruding from the case 5 is inserted into a through hole 36 provided corresponding to each battery of the wiring board 30 and connected to the connection terminal 32 of the wiring board 30. ing. At this time, the wiring board 30 is in contact with and in close contact with the case 5, and the through hole 36 has a gap 36 </ b> A so as not to block the open portion 17 provided on the side surface of the positive electrode cap 16. The gap 36 </ b> A forms a space in which a problem occurs in the battery and the gas ejected from the open portion 17 of the positive electrode cap 16 is discharged. That is, the ejected gas communicates with the outside from the space of the exhaust chamber 24 of the lid 20 through the housing opening 26 through the gap 36A between the connection terminal 32 of the wiring board 30 and the through hole 36. 60 is discharged.

  As shown in FIG. 2C, the wiring board 30 has a laminated structure of at least two layers of a heat-resistant member 30a made of, for example, a glass-epoxy substrate or polyimide, and an elastic member 30b having rubber elasticity, for example. And since the elastic member 30b elastically deforms and closely contacts with the upper surface 5A of the case 5, high airtightness can be ensured. In addition, when high airtightness can be ensured, there is no need for the wiring board 30 having a laminated structure. Furthermore, the wiring board 30 includes a connection terminal 32 connected to the positive electrode cap 16 of each battery inserted in the through hole 36 and an extending portion of the connection plate 33 connecting the other electrode (for example, the negative electrode) of each battery in parallel. The connection terminal 34 is connected to 33A, and the connection terminal 32 is provided so as not to completely block the through hole 36. In addition, the connection terminal 32 and the connection board 33 are comprised, for example with a nickel plate, a lead wire, etc., and are connected with the connection terminal 34 formed with copper foil etc. via solder, for example. The positive electrode cap 16 and the connection terminal 32, and the negative electrode and the connection plate 33 are connected by, for example, electric welding or spot welding.

  Thereby, since the assembled battery 41 can be connected via the wiring board 30, the space required for routing of power supply wiring, control wiring, etc. can be reduced significantly. Further, the open portion 17 of the positive electrode cap 16 of each unit cell 40 is accommodated in the through hole 36 of the wiring board 30. The lower elastic member 30 b of the wiring board 30 is pressed against the upper surface 5 </ b> A of the unit cell 40. Therefore, portions other than the positive electrode cap 16 of the unit cell 40 are sealed with the wiring board 30. As a result, it is possible to minimize the influence on the adjacent unit cell due to the high-temperature gas ejected from the unit cell 40 at the time of abnormality.

  Next, the exhaust duct and the battery pack of the battery module according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 4A, the battery pack is composed of a plurality of battery modules 100. Although not shown, each battery module is electrically connected directly or indirectly through an electric circuit. The exhaust duct 60 of each battery module 100 is connected to the connecting pipe 110.

  As shown in FIG. 4B, the exhaust duct 60 includes a first opening 61, a second opening 62 having a larger area than the first opening 61, and a cavity 65. The cavity 65 is connected to the second opening 62 from the first opening 61 and has a shape in which the inner diameter (cross-sectional area) gradually increases from the first opening 61 to the second opening 62. The first opening 61 is connected to the lid body 20 that is a housing through the housing opening 26. More specifically, the exhaust duct 60 is connected to a space formed between the lid body 20 and the wiring board 30 via the first opening 61. The valve 63 is provided on the side close to the second opening 62 of the exhaust duct 60. Thus, the exhaust duct 60 is connected to the connecting pipe 110 via the valve 63.

  In this configuration, even if gas is generated in any battery module by the connecting pipe 110, it can be led to the safest place and discharged to the outside. Furthermore, when the valve 63 is provided in each battery module, even if gas is discharged | emitted from any one battery module, the gas does not penetrate | invade into another battery module.

  It is preferable that a deformable movable portion 64 that can change the direction of the exhaust duct 60 relative to the lid 20 is provided on the side of the exhaust duct 60 close to the first opening 61. In the drawing, the movable portion 64 is provided continuously to the first opening 61, but the movable portion 64 may be provided at a position slightly away from the first opening 61. The movable part 64 can be formed by a bellows tube, for example. Thus, by providing a movable part, a battery pack is comprised with the some battery module 100, and when connecting the exhaust duct 60 of each battery module 100 further, the freedom degree of arrangement | positioning of the battery module 100 increases.

  The main body portion of the exhaust duct 60 is preferably composed of a metal tube mainly composed of copper for heat dissipation. The movable part 64 may be made of a material different from that of the main body of the exhaust duct 60. For example, the movable part 64 may be made of stainless steel in order to ensure strength. In that case, the main body portion of the exhaust duct 60 and the movable portion 64 are welded. The first opening 61 is connected to the lid 20 by a method such as insert fitting at the housing opening 26.

  In the present embodiment, the valve 63 is constituted by an electromagnetic valve. In this case, a temperature sensor such as a thermistor or a pressure sensor is provided at a predetermined position in the battery module 100 to provide a temperature value or a pressure value, or a temperature change or a pressure change associated with the discharge of the high temperature gas from the unit cell 40. Is detected by a control circuit (not shown), and the valve 63 is operated. In addition to this, the valve 63 may be formed of a simple elastic thin plate check valve that blocks the second opening 62.

  Next, with reference to FIG. 5, operations and effects when abnormal heat generation or the like occurs in one of the single cells 40 in the battery module 100 will be described. FIG. 5 (a) is a cross-sectional view for explaining the state of exhaust of gas that is ejected when abnormal heat generation or the like occurs in one of the single cells in battery module 100 according to the embodiment of the present invention. 5B is an enlarged cross-sectional view of a portion 5B in FIG. 5A, and FIG. 5C is an enlarged cross-sectional view around the exhaust duct 60 in FIG. 5A.

  First, as shown in FIG. 5B, one of the unit cells 40 constituting the assembled battery 41 abnormally generates heat, and a gas pressure of the gas generated in the case 5 is a vent mechanism. The gas 45 is ejected. The ejected gas 45 is ejected from the opening portion 17 of the positive electrode cap 16 into the gap 36A of the through hole 36 in which the positive electrode cap 16 is inserted.

  Next, as shown in FIG. 5A, the gas 45 does not fill the gap 36 </ b> A, and the exhaust chamber of the lid 20 from between the through holes 36 not blocked by the connection terminals 32 of the wiring board 30. 24 is exhausted. Then, it is finally discharged from the housing opening 26 provided in the lid 20 through the exhaust duct 60 to the outside.

  At this time, when the gas 45 is suddenly ejected from the defective battery of the assembled battery 41, there is generally a high risk of ignition due to ignition or the like. However, in the battery module 100, the amount of oxygen in the gap 36A in the through hole 36 is limited, and oxygen is not supplied from the outside, so the possibility of igniting the gas is extremely low. As a result, the gas 45 is exhausted from the through hole 36 of the wiring board 30. Therefore, explosive expansion due to gas ignition does not occur, and the battery module 100 never ruptures.

  Further, the high temperature gas 45 discharged from the housing opening 26 enters the exhaust duct 60 through the first opening 61 as shown in FIG. The cross-sectional area of the exhaust duct 60 gradually increases from the first opening 61 toward the second opening 62. Therefore, the gas 45 advances to the second opening 62 while expanding. At this time, the temperature of the gas 45 decreases according to Boyle-Charles' law. As a result, even if the gas whose temperature has dropped through the exhaust duct 60 is discharged to the connecting pipe 110, it does not ignite.

  Furthermore, the valve 63 provided on the side of the exhaust duct 60 close to the second opening 62 prevents the gas flow from the outside into the exhaust duct 60. Therefore, the valve 63 reliably prevents the outside air from being mixed with the high temperature gas 45 in the vicinity of the first opening 61 and the gas 45 is ignited.

  In particular, if the exhaust duct 60 is made of a metal having a high thermal conductivity, such as copper, it is preferable in addition to a temperature decrease due to expansion, and a heat radiation effect from the outer surface of the exhaust duct 60 is added.

  When a failure occurs in the unit cell 40 using a non-aqueous electrolyte mainly composed of ester or ether, a mixed gas such as carbon monoxide, methane, ethane, propane, hydrogen, and ethylene is discharged. In order to prevent such gas ignition, it is necessary to lower the outlet temperature to the atmosphere below 400 ° C. Further, when the battery module 100 is configured by the unit cell 40 having an outer diameter of 18 mm and a height of 65 mm, the temperature of the gas 45 discharged from the unit cell 40 reaches about 1400 ° C. Considering the temperature drop only due to the effect of adiabatic expansion, the ratio C of the cross-sectional area A of the second opening 62 to the cross-sectional area a of the first opening 61 is preferably 4.7 or more.

  When the battery module 100 is configured by the unit cell 40 having an outer diameter of 18 mm and a height of 65 mm, the length of the exhaust duct 60 (the length in the direction passing through the first opening 61 and the second opening 62) is 200 mm or more. It is preferable that Thereby, even when the valve 63 is opened, the temperature of the gas 45 can be reliably lowered to such an extent that it does not ignite even if a slight amount of outside air enters the exhaust duct 60.

  Next, the inner shape of the exhaust duct will be described with reference to FIG. FIG. 6 is a cross-sectional view of the inner wall shape of another exhaust duct according to the embodiment of the present invention.

  In FIG. 4B and FIG. 5C, the shape of the cavity 65 inside the exhaust duct 60 is substantially frustoconical. However, it is not limited to this shape. In order to enhance the effect of adiabatic expansion, a shape in which the cross-sectional area immediately increases from the first opening 61, such as the shape 60A and the shape 60B, is preferable. On the other hand, in the direction passing through the first opening 61 and the second opening 62 as in the shape 60C, the cross section of the inner surface connecting the first opening 61 and the second opening 62 is located inside the cavity 65. It may have a convex shape. By forming the exhaust duct in a trumpet shape in this manner, the gas flow velocity near the first opening 61 is increased, and the exhaust efficiency is increased.

  In the exhaust duct, the cross-sectional area gradually increases from the first opening 61 toward the second opening 62, but there may be a portion where the cross-sectional area does not partially change. For example, in the example of FIG. 4B, there is such a portion in the vicinity of the second opening 62 and is connected to the valve 63. In addition, in order to support the exhaust duct 60 from the outside, there may be a portion where the cross-sectional area does not partially change in the intermediate portion. Alternatively, there may be a portion where the cross-sectional area is partially reduced. Even if it is such a shape, if the area of the 2nd opening part 62 is larger than the area of the 1st opening part 61, it is the category of this invention.

  As described above, the gas ejected when a failure occurs in the unit cell 40 housed in a sealed state inside the casing constituted by the main body 50 and the lid 20 is transferred from the casing to the exhaust duct 60. Discharged. The exhaust duct 60 gradually increases in cross-sectional area toward the second opening 62 that is an outlet, so that the temperature of the gas decreases while expanding. Further, since the valve 63 is provided on the side close to the second opening 62, the high-temperature gas and the outside air before the temperature is sufficiently lowered are not mixed. Therefore, the gas is exhausted to the outside of the battery module 100 without igniting.

  Further, inside the casing, the jetted gas can be discharged out of the battery module 100 in a gas state from the gap of the through hole 36 of the wiring board 30. As a result, there is no ignition or smoke due to gas ignition. Thus, the battery module excellent in safety | security is realizable.

  Further, the assembled battery 41 can be stored in a sealed state in the storage portion 54 of the main body 50 by the wiring board 30 and the housing. Therefore, it is not necessary to store the unit cells 40 individually. As a result, the battery module 100 can be easily downsized. Furthermore, the wiring board 30 can significantly reduce the space required for routing power supply wiring and control wiring. As a result, it is possible to realize a battery module that is smaller, safer, and superior in reliability.

  In the present embodiment, the example in which the lid 20 and the main body 50 are made of an insulating material such as polycarbonate resin has been described. However, the present invention is not limited to this. For example, it is good also as a structure coat | covered with insulating resin of metal materials, such as aluminum. As a result, the mechanical strength can be improved, the lid can be made thinner, and the battery module can be further miniaturized. Furthermore, a highly reliable battery module that is less likely to cause ignition or the like can be obtained by improving the cooling property of the gas ejected by the high thermal conductivity of the metal material. Depending on the arrangement of the assembled battery 41 and the shape of the entire casing, the casing opening 26 may be provided in the main body 50 instead of the lid 20.

  Further, the exhaust duct may not have a rotationally symmetric shape such as a truncated cone, a bell shape, or a trumpet shape, but may have a polygonal cross-sectional shape perpendicular to the direction passing through the first opening 61 and the second opening 62, for example. .

  As shown in FIG. 4B, the valve 63 is provided outside the second opening 62, but may be formed inside the exhaust duct 60 as long as it is close to the second opening 62.

  The unit cell 40 is not limited to a cylindrical shape, and may be a square shape. Moreover, since the temperature of the hot exhaust gas is lowered and discharged safely, the unit cell 40 may be an alkaline storage battery in addition to the non-aqueous electrolyte battery. Furthermore, in the present embodiment, the unit cells 40 are connected in parallel. However, the present invention is not limited to this, and the present invention can also be applied when connected in series.

  INDUSTRIAL APPLICABILITY The present invention is useful as a battery module and a battery pack that require high capacity and high voltage, such as automobiles, bicycles, and electric tools, particularly hybrid cars and electric cars, and that require high reliability and safety. .

DESCRIPTION OF SYMBOLS 1 Positive electrode 1a Positive electrode collector 1b Positive electrode layer 2 Negative electrode 3 Separator 4 Electrode group 5 Case 5A Upper surface 6 Sealing plate 7 Gasket 8 Positive electrode lead 9 Negative electrode lead 10a, 10b Insulating plate 11 Negative electrode collector 15 Negative electrode layer 16 Positive electrode cap 17 Opening Portion 18 Current interruption member 19 Vent mechanism 20 Lid 22 Outer wall 24 Exhaust chamber 26 Housing opening 30 Wiring board 30a Heat resistant member 30b Elastic member 32, 34 Connection terminal 33 Connection plate 33A Extending portion 36 Through hole 36A Gap 40 Single Battery 41 Battery assembly 45 Gas 50 Body portion 54 Storage portion 60 Exhaust duct 60A, 60B, 60C Shape 61 First opening portion 62 Second opening portion 63 Valve 64 Movable portion 65 Cavity portion 100 Battery module 110 Connecting tube

Claims (6)

  1. Multiple cells,
    A housing that houses the plurality of single cells and has a housing opening;
    A first opening; a second opening having a larger area than the first opening; and a cavity connected from the first opening to the second opening, wherein the first opening is the housing. And an exhaust duct connected to the housing at the opening.
  2. The housing is
    A main body that houses the plurality of single cells and has an open end;
    A lid that covers the open end of the main body;
    Consists of
    Further comprising a wiring board in which the plurality of single cells are connected between the lid and the opening end,
    The battery module according to claim 1, wherein the exhaust duct is connected to a space formed between the lid body and the wiring board through the first opening.
  3.  3. The battery module according to claim 1, further comprising a valve provided on a side of the exhaust duct close to the second opening and preventing a gas flow from the outside into the exhaust duct.
  4.  The battery according to any one of claims 1 to 3, wherein a deformable movable portion that can change a direction of the exhaust duct with respect to the housing is provided on a side closer to the first opening of the exhaust duct. module.
  5.  A cross section of the inner surface of the exhaust duct connecting the first opening and the second opening in the direction passing through the first opening and the second opening is directed toward the inside of the cavity. The battery module as described in any one of Claim 1 to 4 which has a convex shape.
  6. A plurality of battery modules according to claim 3 ;
    A battery pack comprising: a connecting pipe connecting the exhaust duct of each of the plurality of battery modules via the valve.
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JP2014197452A (en) * 2011-08-03 2014-10-16 パナソニック株式会社 Battery module
JP5926571B2 (en) * 2012-02-14 2016-05-25 川崎重工業株式会社 Battery module
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JP6296362B2 (en) * 2013-09-30 2018-03-20 パナソニックIpマネジメント株式会社 Battery unit
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JP6269134B2 (en) * 2014-02-12 2018-01-31 日産自動車株式会社 Power supply
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JP6361231B2 (en) 2014-03-31 2018-07-25 株式会社Gsユアサ Power storage device
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