WO2013124889A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
- Publication number
- WO2013124889A1 WO2013124889A1 PCT/JP2012/001162 JP2012001162W WO2013124889A1 WO 2013124889 A1 WO2013124889 A1 WO 2013124889A1 JP 2012001162 W JP2012001162 W JP 2012001162W WO 2013124889 A1 WO2013124889 A1 WO 2013124889A1
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- WIPO (PCT)
- Prior art keywords
- region
- power storage
- positive electrode
- protrusion
- negative electrode
- Prior art date
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0468—Compression means for stacks of electrodes and separators
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0472—Vertically superposed cells with vertically disposed plates
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
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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
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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
- 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 power storage device including a mechanism that applies a binding force to a plurality of power storage elements arranged side by side in one direction.
- Some battery stacks are made up of multiple cells arranged in one direction.
- a restraining force is applied to the plurality of single cells by using a restraining mechanism.
- the binding force is a force for sandwiching the plurality of unit cells in the arrangement direction of the plurality of unit cells.
- a partition plate is arranged at a position adjacent to the unit cell, and a partition plate is brought into contact with the unit cell by bringing a protrusion provided on the partition plate into contact with the unit cell. To give the cell a binding force.
- a space for moving a heat exchange medium used for temperature adjustment of the unit cell is formed between the unit cell and the partition plate by using the protrusion.
- a binding force When applying a binding force to the unit cell, it is desirable to apply the binding force evenly to the surface of the unit cell that receives the binding force.
- a power generation element that charges and discharges is accommodated inside the unit cell, and in a configuration in which a binding force is simultaneously applied to a plurality of unit cells, the power generation element in the plurality of unit cells is equally restrained. It is necessary to give power. Specifically, it is necessary to apply an equal restraining force to the reaction region where charge and discharge are performed among the power generation elements.
- the unit cells when the unit cells are arranged, the unit cells may be displaced.
- the power generation elements (reaction regions) in the plurality of single cells apply a restraining force only to regions where they overlap each other in the arrangement direction of the single cells. Thereby, the restraining force added to all the reaction areas can be equalized.
- the binding force is applied only to the region where the reaction regions overlap each other, the binding force is applied only to a part of the unit cell, and the binding force is applied to the entire surface of the unit cell that receives the binding force. It becomes impossible to do.
- the power storage device includes a plurality of power storage elements arranged side by side in a predetermined direction and a restraint plate disposed between two power storage elements adjacent in the predetermined direction.
- the power storage element includes a power generation element that charges and discharges and a case that houses the power generation element.
- the restraint plate has a protrusion, and the protrusion gives a restraining force to the power storage element and forms a space between the power storage element.
- the power generation element has a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. Moreover, the power generation element includes a reaction region in which a chemical reaction associated with charge / discharge is performed.
- the plurality of protrusions include a first protrusion that contacts the first region of the case and a second protrusion that contacts the second region of the case. The first region of the case faces the reaction region, and the second region of the case faces the region other than the reaction region in the power generation element.
- the present invention it is possible to apply a restraining force only to the reaction region by using the first protrusion.
- the restraining force applied to the reaction region can be equalized in the plurality of power storage elements.
- a restraining force can be applied to the entire case including the first region and the second region, and the restraining force is applied only to a part of the case (first region). Can be suppressed.
- the first region can be a region facing reaction regions in a plurality of power storage elements that overlap each other in a predetermined direction.
- the second region can be a region that does not face all the reaction regions in the plurality of power storage elements.
- the positive electrode plate can be composed of a positive electrode current collector plate and a positive electrode active material layer formed on the positive electrode current collector plate
- the negative electrode plate is composed of a negative electrode current collector plate and a negative electrode current collector plate formed on the negative electrode current collector plate. It can be composed of a material layer.
- a separator can be made wider than the width
- the second protrusion can apply a binding force to the end of the separator via the case.
- the separator may shrink due to heat generated by the power generation element accompanying charging / discharging.
- the shrinkage of the separator can be suppressed by applying a restraining force to the end of the separator using the second protrusion.
- At least one first protrusion can be arranged along the end of the first region.
- region can be utilized effectively and a 1st projection part can be arrange
- at least 1 2nd projection part can be arrange
- a 2nd protrusion part can be arrange
- a power generation element can be configured by winding a positive electrode plate, a negative electrode plate, and a separator around a predetermined axis. At least one of the first protrusion and the second protrusion can extend in a direction orthogonal to the direction in which the predetermined axis extends in a plane including the first region and the second region. In the plane including the first region and the second region, the length of the case in the direction in which the predetermined axis extends can be longer than the length of the case in the direction orthogonal to the predetermined axis.
- a pair of end plates and a connecting member can be used as a structure for applying a binding force to the storage element.
- the pair of end plates can be arranged at a position sandwiching the plurality of power storage elements in a predetermined direction.
- the connecting member can be extended in a predetermined direction and fixed to the pair of end plates. Accordingly, the pair of end plates can be displaced in a direction approaching each other, and a binding force can be applied to the storage element.
- the space formed by the protrusions of the restraint plate can be used as a passage through which the heat exchange medium used for adjusting the temperature of the electricity storage element moves.
- a cooling heat exchange medium can be used, and when the power storage element is cold, a heating heat exchange medium can be used.
- the temperature of the power storage element can be maintained within a predetermined temperature range, and the input / output performance of the power storage element can be prevented from being deteriorated.
- FIG. 1 is an external view of a battery stack according to this embodiment.
- an X axis, a Y axis, and a Z axis are orthogonal to each other.
- an axis corresponding to the vertical direction is a Z axis.
- the relationship between the X axis, the Y axis, and the Z axis is the same in other drawings.
- the battery stack 1 shown in FIG. 1 can be mounted on a vehicle, for example.
- Vehicles include hybrid cars and electric cars.
- the electric energy output from the battery stack 1 can be converted into kinetic energy, and the vehicle can be driven using this kinetic energy.
- the battery stack 1 When the battery stack 1 is mounted on a vehicle, the battery stack 1 can be accommodated in a stack case.
- the battery stack 1 has a plurality of single cells (corresponding to power storage elements) 10, and the plurality of single cells 10 are arranged in the X direction.
- the number of the single cells 10 can be appropriately set based on the required output of the battery stack 1 and the like.
- a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used.
- An electric double layer capacitor (capacitor) can be used instead of the secondary battery.
- the cell 10 has a battery case 11, and the battery case 11 can be formed of metal, for example.
- the unit cell 10 is a so-called rectangular unit cell 10.
- the battery case 11 has a shape along a rectangular parallelepiped.
- the length of the battery case 11 in the Y direction is longer than the length of the battery case 11 in the Z direction.
- the battery case 11 By configuring the battery case 11 in this way, it is possible to increase the size of the unit cell 10 (a power generation element 15 described later) while suppressing the height (length in the Z direction) of the unit cell 10. By suppressing the height of the unit cell 10, the battery stack 1 can be easily mounted on the vehicle. Moreover, it becomes easy to expand the size of a lid 11b described later, and it becomes easy to attach components (a valve 12, a positive electrode terminal 13, and a negative electrode terminal 14 described later) to the lid 11b.
- the battery case 11 houses a power generation element 15.
- the battery case 11 has a case body 11a and a lid 11b.
- the case main body 11a has an opening for incorporating the power generation element 15, and the lid 11b closes the opening of the case main body 11a.
- the inside of the battery case 11 is hermetically sealed.
- the lid 11b and the case main body 11a can be fixed by welding, for example.
- the valve 12 is provided on the lid 11b.
- the valve 12 is used to discharge gas to the outside of the battery case 11 when gas is generated inside the battery case 11. Specifically, when the internal pressure of the battery case 11 reaches the operating pressure of the valve 12 as the gas is generated, the valve 12 is discharged from the battery case 11 by changing from a closed state to an open state.
- the positive terminal 13 and the negative terminal 14 are fixed to the lid 11b.
- the positive electrode terminal 13 is connected to the power generation element 15 via the positive electrode tab 16a
- the negative electrode terminal 14 is connected to the power generation element 15 via the negative electrode tab 16b.
- the positive electrode terminal 13 passes through the lid 11 b, and the positive electrode terminal 13 has a portion protruding to the outside of the battery case 11 and a portion protruding to the inside of the battery case 11.
- the negative electrode terminal 14 penetrates the lid 11 b, and the negative electrode terminal 14 has a portion protruding to the outside of the battery case 11 and a portion protruding to the inside of the battery case 11.
- FIG. 4 is a development view of the power generation element 15.
- the power generation element 15 includes a positive electrode plate 151, a negative electrode plate 152, and a separator 153.
- the positive electrode plate 151 includes a positive electrode current collector plate 151a and a positive electrode active material layer 151b formed on the surface of the positive electrode current collector plate 151a.
- the positive electrode active material layer 151b includes a positive electrode active material, a conductive agent, a binder, and the like.
- the positive electrode active material layer 151b is formed in a partial region of the positive electrode current collector plate 151a, and the remaining region of the positive electrode current collector plate 151a is exposed.
- a coating apparatus such as a die coater or a gravure coater, the positive electrode active material layer 151b can be formed on the surface of the positive electrode current collector plate 151a.
- the negative electrode plate 152 includes a negative electrode current collector plate 152a and a negative electrode active material layer 152b formed on the surface of the negative electrode current collector plate 152a.
- the negative electrode active material layer 152b includes a negative electrode active material, a conductive agent, a binder, and the like.
- the negative electrode active material layer 152b is formed in a partial region of the negative electrode current collector plate 152a, and the remaining region of the negative electrode current collector plate 152a is exposed.
- a coating apparatus such as a die coater or a gravure coater, the negative electrode active material layer 152b can be formed on the surface of the negative electrode current collector plate 152a.
- the positive electrode active material layer 151b, the negative electrode active material layer 152b, and the separator 153 are impregnated with an electrolytic solution.
- the positive electrode plate 151, the negative electrode plate 152, and the separator 153 are stacked, and this stacked body is wound in the direction indicated by the arrow R in FIG.
- the laminate is wound around the axis AXL extending in the Y direction while being tensioned.
- the part where the laminated body finishes winding can be fixed using, for example, a tape.
- the laminated body wound around the axis AXL is deformed into a shape along the battery case 11 so as to be accommodated in the battery case 11.
- FIG. 5 only the positive electrode current collecting plate 151a is wound at one end of the power generation element 15 in the Y direction.
- a positive electrode tab 16a (see FIG. 3) is fixed to the positive electrode current collecting plate 151a.
- one end of the positive electrode tab 16a is connected to the positive electrode terminal 13, and the other end of the positive electrode tab 16a is connected to the power generation element 15 (positive electrode current collecting plate 151a).
- the positive electrode terminal 13 and the positive electrode tab 16a can be integrally formed.
- the negative electrode current collector plate 152a is wound at the other end of the power generation element 15 in the Y direction, and the negative electrode tab 16b (see FIG. 3) is fixed to the negative electrode current collector plate 152a.
- one end of the negative electrode tab 16b is connected to the negative electrode terminal 14, and the other end of the negative electrode tab 16b is connected to the power generation element 15 (negative electrode current collector plate 152a).
- the negative electrode terminal 14 and the negative electrode tab 16b can also be formed integrally.
- FIG. 3 and FIG. 5 is a region where the positive electrode active material layer 151b and the negative electrode active material layer 152b face each other with the separator 153 interposed therebetween.
- a chemical reaction is performed when charging / discharging the single cell 10 (power generation element 15).
- the single cell 10 power generation element 15
- the lithium ion secondary battery as the unit cell 10 is charged, lithium ions and electrons are released from the positive electrode active material layer 151b, and the negative electrode active material layer 152b absorbs lithium ions and electrons.
- a reaction opposite to the above-described reaction is performed in the positive electrode active material layer 151b and the negative electrode active material layer 152b.
- FIG. 6 is a diagram illustrating the positional relationship between the positive electrode plate 151, the negative electrode plate 152, and the separator 153.
- the reaction region Ar is a region where the positive electrode active material layer 151b and the negative electrode active material layer 152b overlap each other with the separator 153 interposed therebetween.
- the width of the reaction region Ar in the Y direction is W A.
- the length of the Y direction with respect to (width), since the positive electrode active material layer 151b is made shortest, the width W A of the reaction region Ar corresponds to the width of the positive electrode active material layer 151b.
- W B is the length of the negative electrode active material layer 152b in the Y-direction (width), the width W B, wider than the width W A.
- W C is the length of the separator 153 in the Y direction (width), the width W C is wider than the width W B. Width W C of the separator 153, since wider than the width W B of the width W A and the negative electrode active material layer 152b of the positive electrode active material layer 151b, both ends of the separator 153 in the Y direction, the positive electrode active material layer 151b and the negative electrode active Projecting from the material layer 152b.
- the width W C of the separator 153 by greater than the width W B of the width W A and the negative electrode active material layer 152b of the positive electrode active material layer 151b, between the positive electrode active material layer 151b and the negative electrode active material layer 152b In addition, a separator 153 can always be interposed. Thereby, it can prevent that the positive electrode active material layer 151b and the negative electrode active material layer 152b contact directly.
- the reaction region Ar is defined by the positive electrode active material layer 151b, but is not limited thereto. That is, when the width W B of the negative electrode active material layer 152b is narrower than the width W A of the positive electrode active material layer 151b, the reaction area Ar is defined by the negative electrode active material layer 152b. That is, the width of the reaction region Ar is, a width W B of the negative electrode active material layer 152b.
- the plurality of single cells 10 arranged side by side in the X direction are electrically connected in series. Specifically, the positive terminal 13 of the unit cell 10 and the negative terminal 14 of another unit cell 10 are electrically connected by a bus bar.
- a plurality of single cells 10 can be electrically connected in parallel by devising the shape of the bus bar.
- bus bar modules 20 are used to electrically connect a plurality of single cells 10.
- Each bus bar module 20 includes a plurality of bus bars and a resin plate that supports the plurality of bus bars. By using the bus bar module 20, a plurality of bus bars can be easily connected to the plurality of single cells 10 (the positive terminal 13 and the negative terminal 14).
- a pair of end plates 31 are disposed at both ends of the battery stack 1 in the X direction. That is, the pair of end plates 31 sandwich the plurality of unit cells 10 in the X direction.
- a band (corresponding to a connecting member) 32 extends in the X direction, and both ends of the band 32 are fixed to a pair of end plates 31. Fixing portions 32 a provided at both ends of the band 32 are fixed to the end plate 31. As a fixing method of the end plate 31 and the fixing part 32a, for example, there is fastening using a bolt.
- the band 32 can be formed of metal, for example.
- two bands 32 are arranged on the upper surface of the battery stack 1.
- two bands 32 are also disposed on the lower surface of the battery stack 1.
- a binding force can be applied to the plurality of single cells 10 constituting the battery stack 1.
- the binding force is a force that sandwiches the plurality of single cells 10 in the X direction.
- expansion of the unit cell 10 can be suppressed.
- the unit cell 10 since the power generation element 15 repeatedly expands and contracts due to charging and discharging, the unit cell 10 (the power generation element 15) is turned on by applying a binding force to the unit cell 10. It can suppress that output performance falls.
- the two bands 32 are arranged on the upper surface of the battery stack 1 and the two bands 32 are arranged on the lower surface of the battery stack 1, but this is not restrictive.
- the number of the bands 32 arranged on the upper surface and the lower surface of the battery stack 1 can be set as appropriate. That is, it suffices if a binding force can be applied to the unit cell 10 by fixing the band 32 to the pair of end plates 31. Further, a structure in which the pair of end plates 31 are displaced in a direction approaching each other without using the band 32 may be used. Even in this case, a binding force can be applied to the unit cell 10.
- a constraining plate 40 is disposed between two unit cells 10 adjacent in the X direction.
- the restraint plate 40 can be formed of an insulating material such as resin, for example.
- the constraining plate 40 made of an insulating material two unit cells 10 adjacent in the X direction can be in an insulated state.
- FIG. 7 is a view when the restraint plate 40 is viewed from the X direction, in other words, a view (front view) of the restraint plate 40 viewed from the unit cell 10 side.
- FIG. 8 is a sectional view taken along the line Z1-Z1 of FIG.
- the restraining plate 40 has a plurality of first protrusions 41 and two second protrusions 42.
- the first protrusion 41 and the second protrusion 42 are provided on the same plane (YZ plane) of the restraint plate 40 and protrude in the X direction.
- the plane of the constraining plate 40 provided with the first protrusion 41 and the second protrusion 42 faces the unit cell 10 in the X direction.
- the first protrusion 41 and the second protrusion 42 extend in the Z direction.
- the first protrusion 41 and the second protrusion 42 extend in a direction (Z direction) perpendicular to the direction (Y direction) in which the axis AXL (see FIG. 5) of the power generation element 15 extends in the YZ plane. ing.
- the plurality of first protrusions 41 are arranged in the Y direction.
- the two second protrusions 42 are arranged at positions sandwiching the plurality of first protrusions 41 in the Y direction.
- the second protrusion 42 is located on the outer edge side of the restraint plate 40 with respect to the first protrusion 41 in the Y direction.
- the number of the 1st projection parts 41 can be set suitably.
- interval of the two 1st projection parts 41 adjacent in a Y direction can also be set suitably.
- the first protrusion 41 and the second protrusion 42 are formed only on one surface of the restraint plate 40 in the X direction, and the other surface of the restraint plate 40 is a flat surface. It is configured. In other words, in the configuration in which the restraint plate 40 is sandwiched between the two unit cells 10 (configuration shown in FIG. 8), only the first protrusion 41 and the second projection 41 are provided only on the surface of the restraint plate 40 facing the one unit cell 10. A protrusion 42 is formed.
- the first protrusion 41 and the second protrusion 42 are not formed on the surface of the restraining plate 40 facing the other unit cell 10.
- the 1st projection part 41 and the 2nd projection part 42 can also be formed in the surface of the restraint board 40 facing the other unit cell 10.
- a space S (see FIG. 7) is formed between the restraint plate 40 and the unit cell 10 by the tips of the first projection unit 41 and the second projection unit 42 coming into contact with the unit cell 10 (battery case 11). Is done.
- the space S is formed between two first protrusions 41 adjacent in the Y direction.
- the space S is a space in which air (corresponding to a heat exchange medium) for adjusting the temperature of the unit cell 10 moves.
- air for adjusting the temperature of the unit cell 10 can also flow through the space formed between the first protrusion 41 and the second protrusion 42 adjacent in the Y direction.
- the temperature rise of the unit cell 10 can be suppressed by introducing cooling air to the space S. Further, when the unit cell 10 is excessively cooled, the temperature drop of the unit cell 10 can be suppressed by introducing the heating air to the space S. By maintaining the temperature of the unit cell 10 within a desired temperature range, it is possible to suppress deterioration of the input / output characteristics of the unit cell 10.
- the temperature adjusting air travels in the Z direction along the first protrusion 41.
- the length of the battery case 11 in the Z direction is shorter than the length of the battery case 11 in the Y direction. For this reason, it is preferable to flow the temperature adjusting air along the Z direction rather than flowing the temperature adjusting air along the Y direction.
- the air When supplying air for temperature adjustment from the upper surface of the battery stack 1, the air travels from the upper part of the restraining plate 40 toward the lower part. When air is moving through the space S, heat exchange is performed between the air and the unit cell 10, and the temperature of the unit cell 10 can be adjusted. The air after temperature adjustment is discharged from the lower surface of the battery stack 1. On the other hand, when the temperature adjusting air is supplied from the lower surface of the battery stack 1, the air travels from the lower part to the upper part of the restraining plate 40. The air after temperature adjustment is discharged from the upper surface of the battery stack 1.
- air is used to adjust the temperature of the unit cell 10, but the present invention is not limited to this. That is, a gas other than air or a liquid can be used.
- a liquid it is preferable to use an insulating liquid. Further, when liquid is used, it is necessary to keep the liquid movement path sealed.
- FIG. 9 is a diagram illustrating the positions of the first protrusion 41 and the second protrusion 42 with respect to the power generation element 15.
- the outer surface of the power generation element 15 is covered with a separator 153, and the positive current collector 151 a and the negative current collector 152 a are exposed at both ends of the power generation element 15 in the Y direction.
- the first projecting portion 41 and the second projecting portion 42 are disposed at a position shown in FIG.
- the plurality of first protrusions 41 are disposed in the first region A1 and are used to apply a binding force to the reaction region Ar of the power generation element 15.
- the two first protrusions 41 are arranged along the end of the first region A1.
- the tip of the first protrusion 41 comes into contact with a region of the battery case 11 corresponding to the first region A1.
- the 2nd projection part 42 is arranged in the 2nd field A2.
- the second protrusion 42 is disposed along the end of the second region A ⁇ b> 2 and is disposed along the end of the separator 153.
- the tip of the second protrusion 42 comes into contact with a region corresponding to the second region A2 in the battery case 11.
- the region of the battery case 11 corresponding to the first region A1 and the second region A2 is located on the same plane (YZ plane).
- the position of the unit cells 10 may vary when the battery stack 1 is manufactured. Specifically, the unit cell 10 may be displaced in the Y direction. If the position of the unit cell 10 varies, the position of the reaction region Ar of the power generation element 15 also varies as shown in FIG.
- the first region A1 is set in consideration of the variation in the position of the reaction region Ar. That is, as shown in FIG. 10, a region where all reaction regions Ar overlap each other is defined as a first region A1.
- the first region A1 is a region where all the reaction regions Ar overlap each other when the battery stack 1 is viewed from the X direction.
- the width of the first region A1 shown in FIG. 10 corresponds to the length in the Y direction.
- the first region A1 can be determined if the maximum displacement amount Dmax when the displacement of the reaction region Ar occurs by performing an experiment or the like in advance.
- the positional deviation of the reaction region Ar the deviation of the reaction region Ar in the Y direction (left-right direction in FIG. 10) can be considered.
- the shift amount Dmax can be determined based on the reaction region Ar (second column) shifted to the leftmost side in FIG. 10 and the reaction region Ar (third column) shifted to the rightmost side in FIG.
- the positional shift of the reaction region Ar due to the positional shift of the unit cell 10 is considered, but the present invention is not limited to this. That is, the displacement of the reaction region Ar may occur due to other factors.
- the position of the positive electrode active material layer 151b with respect to the positive electrode current collector plate 151a may be shifted depending on the characteristics of the coating apparatus.
- the reaction region Ar is defined by the positive electrode active material layer 151b, the reaction region Ar is also shifted due to the displacement of the position of the positive electrode active material layer 151b with respect to the positive electrode current collector plate 151a.
- the negative electrode active material layer 152b is formed on the surface of the negative electrode current collector plate 152a, the position of the negative electrode active material layer 152b with respect to the negative electrode current collector plate 152a may be shifted depending on the characteristics of the coating apparatus. .
- the power generation element 15 is configured by laminating the positive electrode plate 151, the negative electrode plate 152, and the separator 153, and winding this laminate. For this reason, when laminating
- reaction region Ar If the positive electrode active material layer 151b (reaction region Ar) is displaced during the production of the unit cell 10, the reaction region Ar is not displaced even when the plurality of unit cells 10 are arranged without displacement when the battery stack 1 is assembled. , It will shift.
- the deviation of the reaction area Ar described above occurs when the battery stack 1 is assembled or when the unit cell 10 is manufactured, but it is difficult to eliminate the deviation of the reaction area Ar at all. Therefore, as the unit cell 10 used in the battery stack 1, only those having the deviation of the reaction region Ar within an allowable range are used.
- the first protrusion 41 by arranging the first protrusion 41 in the first region A1, it is possible to apply an equal binding force to the reaction region Ar in all the unit cells 10 (power generation elements 15). As shown in FIG. 10, since the first region A1 overlaps with all the reaction regions Ar, by arranging the first protrusions 41 in the first regions A1, the first protrusions 41 move from the first protrusions 41 to the reaction regions Ar. The transmitted restraint load can be equalized. Thereby, in all the single cells 10, a constraint condition can be made equal and input / output performance can be equalized.
- the binding force applied to the reaction region Ar there may be variations in the binding force applied to the reaction region Ar. That is, when the first protrusion 41 is disposed in a region outside the first region A1, a reaction region Ar that receives the restraining force from the first protrusion 41 and a reaction region Ar that does not receive the restraining force are generated. End up. For example, in FIG. 10, when the first protrusion 41 is arranged in a region that is out of the first region A1, the binding force from the first protrusion 41 is one of the reaction regions Ar in the second row and the third row. Only given to one side.
- a binding force is applied only to a part of the unit cell 10 (battery case 11).
- the region other than the first region A1 in the battery case 11 is easily deformed. That is, since the surface of the battery case 11 that receives the restraining force includes not only the first region A1 but also other regions, when the restraining force is applied only to the first region A1, the other regions are deformed.
- the restraining load transmitted from the first protrusion 41 to the power generation element 15 is reduced by the amount by which the battery case 11 is deformed.
- the second protrusion 42 is provided in the second region A2.
- the first protrusion 41 and the second protrusion 42 are not provided in the region located between the first region A1 and the second region A2.
- the second region A2 is a region that does not overlap the reaction region Ar in consideration of the shift of the reaction region Ar.
- the second region A2 is located outside the reaction region Ar (second row and third row) having the largest deviation.
- a binding force can be applied to the second region A2 of the battery case 11 as well.
- a restraining force can be given with respect to the whole surface of the battery case 11 which receives a restraining force, and an equal restraining force can be given with respect to the whole battery case 11.
- FIG. Accordingly, a part of the battery case 11 is not deformed, and it is possible to suppress the restraint load from being lowered due to the deformation of the battery case 11.
- the second region A2 is located away from the reaction region Ar, even if the second protrusion 42 is provided in the second region A2, the binding force from the second protrusion 42 is applied to the reaction region Ar. Can be suppressed. That is, only the restraining force from the first protrusion 41 is applied to the reaction region Ar, and the restraining force acting on all the reaction regions Ar remains equal.
- the separator 153 may contract due to this heat. If a binding force is not applied to the end of the separator 153, the end of the separator 153 is displaced by contraction of the separator 153 as shown in FIGS. Specifically, the end portions 153a and 153b of the separator 153 are displaced inward.
- the separator 153 since the separator 153 is wound in a tensioned state, the separator 153 is easily deformed in the direction indicated by the arrow D1 in FIG. 12, but is not easily deformed in the direction indicated by the arrow D2.
- the end portion 151c (see FIG. 11) of the positive electrode plate 151 may face the negative electrode plate 152 without the separator 153 interposed therebetween. Further, when the end portion 153b of the separator 153 is deformed as shown in FIGS. 11 and 12, the end portion 152c (see FIG. 11) of the negative electrode plate 152 may face the positive electrode plate 151 without the separator 153 interposed therebetween. is there.
- the end portions 153a and 153b of the separator 153 are located away from the reaction region Ar. Therefore, by arranging the second protrusion 42 in the second region A2 away from the reaction region Ar, By using the second protrusion 42, it is possible to apply a restraining force to the end portions 153a and 153b of the separator 153. And it can suppress that edge part 153a, 153b deform
- the second protrusion 42 may not overlap with the end portions (153 a, 153 b) of the separator 153.
- the second protrusion 42 extends in the Z direction, but the present invention is not limited to this. That is, the 2nd protrusion part 42 should just be arrange
- the length of the second protrusion 42 in the Z direction can be made shorter than the length of the second protrusion 42 shown in FIG.
- the central portion in the Z direction is most easily deformed.
- the second protrusions 42 can be provided only at positions where the end portions 153a and 153b are easily deformed.
- the length of the second protrusion 42 in the Z direction can be made shorter than the length of the second protrusion 42 shown in FIG.
- the first protrusion 41 is disposed over the entire first region A1, but the present invention is not limited to this.
- the 1st projection part 41 should just be arrange
- the first protrusion 41 can be disposed only at the end of the first region A1 in the Y direction.
- the second protrusions 42 are arranged in each of the two second regions A2 shown in FIGS. 9 and 10, but the present invention is not limited to this. Specifically, the second protrusion 42 can be disposed only in one of the two second regions A2. Even in this case, it is possible to apply a restraining force to the end portion of the separator 153 by the second protrusion 42, and it is possible to suppress the end portion of the separator 153 from being deformed.
- the power generation element 15 is configured by winding a laminate of the positive electrode plate 151, the negative electrode plate 152, and the separator 153, but is not limited thereto. Specifically, the power generation element 15 can be configured by simply stacking the positive electrode plate 151, the negative electrode plate 152, and the separator 153. Even in such a power generation element 15, the first region A1 and the second region A2 can be defined as in the present embodiment. And the 1st projection part 41 can be arranged in the 1st field A1, and the 2nd projection part 42 can be arranged in the 2nd field A2.
- the first protrusion 41 and the second protrusion 42 extend in the Z direction, but the shapes of the first protrusion 41 and the second protrusion 42 are limited to this. It is not a thing. That is, it is only necessary that the first protrusion 41 is disposed in the first area A1 and the second protrusion 42 is disposed in the second area A2.
- a first protrusion 41 and a second protrusion 42 can be provided.
- a plurality of first protrusions 41 are arranged side by side in the Z direction and the Y direction in the first region A1.
- a plurality of second protrusions 42 are arranged in the Z direction.
- the number of the first protrusions 41 and the second protrusions 42 arranged side by side in the Z direction can be set as appropriate.
- the number of first protrusions 41 arranged side by side in the Y direction can be set as appropriate.
- a plurality of first protrusions 41 are arranged in the Y direction in the first region A1. Moreover, the row
- two second protrusions 41 are arranged side by side in the Z direction, and a row (two rows) including the two second protrusions 41 arranged in the Z direction is Z It is displaced in the direction.
- the first protrusion 41 and the second protrusion 42 can be formed in the shapes shown in FIGS. 15A to 15C.
- 15A to 15C show the outer shape of one first protrusion 41 (or second protrusion 42).
- the 1st projection part 41 (or 2nd projection part 42) is formed along the rectangular parallelepiped.
- the 1st projection part 41 (or 2nd projection part 42) is formed along the cylinder.
- the 1st projection part 41 (or 2nd projection part 42) is formed along the truncated cone.
- the protrusions extending in the Y direction are provided on the restraining plate 40, it is not necessary to consider the shift of the reaction region Ar described above. As shown in FIG. 10, even if the reaction region Ar is displaced in the Y direction, an equal restraining force can be applied to all the reaction regions Ar by using the protrusions extending in the Y direction.
- the protrusion extending in the Y direction is located in both the first region A1 and the second region A2.
- the shapes of the first protrusion 41 and the second protrusion 42 are not limited to the shapes shown in FIGS. 15A to 15C. That is, the 1st protrusion part 41 and the 2nd protrusion part 42 should just protrude in the X direction.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Battery Mounting, Suspending (AREA)
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Abstract
Description
Claims (12)
- 充放電を行う発電要素と、前記発電要素を収容するケースとをそれぞれ有し、所定方向に並んで配置される複数の蓄電素子と、
前記蓄電素子に対して拘束力を与えるとともに、前記蓄電素子との間にスペースを形成する複数の突起部を有し、前記所定方向で隣り合う2つの前記蓄電素子の間に配置される拘束板と、を備え、
前記発電要素は、正極板と、負極板と、前記正極板および前記負極板の間に配置されるセパレータとを有するとともに、充放電に伴う化学反応が行われる反応領域を含んでおり、
前記複数の突起部は、
前記反応領域と対向する前記ケースの第1領域と接触する第1突起部と、
前記反応領域以外の前記発電要素の領域と対向する前記ケースの第2領域と接触する第2突起部と、を有する、
ことを特徴とする蓄電装置。 - 前記第1領域は、前記複数の蓄電素子における前記反応領域が前記所定方向で互いに重なる領域と対向していることを特徴とする請求項1に記載の蓄電装置。
- 前記第2領域は、前記複数の蓄電素子における、すべての前記反応領域と対向していないことを特徴とする請求項1又は2に記載の蓄電装置。
- 前記正極板は、正極集電板と、前記正極集電板に形成された正極活物質層と、を有し、
前記負極板は、負極集電板と、前記負極集電板に形成された負極活物質層と、を有し、
前記セパレータは、前記正極活物質層および前記負極活物質層の幅よりも広いことを特徴とする請求項1から3のいずれか1つに記載の蓄電装置。 - 前記第2突起部は、前記ケースを介して、前記セパレータの端部に拘束力を与えることを特徴とする請求項4に記載の蓄電装置。
- 前記第1突起部を複数有しており、
前記複数の第1突起部のうち、少なくとも1つの前記第1突起部は、前記第1領域の端に沿って配置されていることを特徴とする請求項1から5のいずれか1つに記載の蓄電装置。 - 前記第2突起部を複数有しており、
前記複数の第2突起部のうち、少なくとも1つの前記第2突起部は、前記第2領域の端に沿って配置されていることを特徴とする請求項1から6のいずれか1つに記載の蓄電装置。 - 前記発電要素は、前記正極板、前記負極板および前記セパレータが所定軸の周りで巻かれることによって構成されていることを特徴とする請求項1から7のいずれか1つに記載の蓄電装置。
- 前記第1突起部および前記第2突起部の少なくとも一方は、前記第1領域および前記第2領域を含む平面内において、前記所定軸が延びる方向と直交する方向に延びていることを特徴とする請求項8に記載の蓄電装置。
- 前記第1領域および前記第2領域を含む平面内において、前記所定軸が延びる方向における前記ケースの長さは、前記所定軸と直交する方向における前記ケースの長さよりも長いことを特徴とする請求項8又は9に記載の蓄電装置。
- 前記所定方向において、前記複数の蓄電素子を挟む位置に配置された一対のエンドプレートと、
前記所定方向に延びて、前記一対のエンドプレートに固定される連結部材と、
を有することを特徴とする請求項1から10のいずれか1つに記載の蓄電装置。 - 前記スペースは、前記蓄電素子の温度調節に用いられる熱交換媒体が移動する通路であることを特徴とする請求項1から11のいずれか1つに記載の蓄電装置。
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DE201211005910 DE112012005910T5 (de) | 2012-02-21 | 2012-02-21 | Elektrisches Speichergerät |
CN201280070097.2A CN104137295B (zh) | 2012-02-21 | 2012-02-21 | 蓄电装置 |
JP2014500558A JP5867582B2 (ja) | 2012-02-21 | 2012-02-21 | 蓄電装置 |
PCT/JP2012/001162 WO2013124889A1 (ja) | 2012-02-21 | 2012-02-21 | 蓄電装置 |
US14/379,531 US9893327B2 (en) | 2012-02-21 | 2012-02-21 | Electric storage apparatus |
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PCT/JP2012/001162 WO2013124889A1 (ja) | 2012-02-21 | 2012-02-21 | 蓄電装置 |
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JP (1) | JP5867582B2 (ja) |
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JP2019057445A (ja) * | 2017-09-21 | 2019-04-11 | 株式会社Gsユアサ | 蓄電装置 |
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DE112012005910T5 (de) | 2014-12-04 |
CN104137295A (zh) | 2014-11-05 |
CN104137295B (zh) | 2016-12-28 |
US20150056487A1 (en) | 2015-02-26 |
US9893327B2 (en) | 2018-02-13 |
JPWO2013124889A1 (ja) | 2015-05-21 |
JP5867582B2 (ja) | 2016-02-24 |
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