WO2015156167A1 - 扁平型二次電池 - Google Patents
扁平型二次電池 Download PDFInfo
- Publication number
- WO2015156167A1 WO2015156167A1 PCT/JP2015/060125 JP2015060125W WO2015156167A1 WO 2015156167 A1 WO2015156167 A1 WO 2015156167A1 JP 2015060125 W JP2015060125 W JP 2015060125W WO 2015156167 A1 WO2015156167 A1 WO 2015156167A1
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- Prior art keywords
- length
- secondary battery
- power generation
- generation element
- exterior member
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a flat secondary battery.
- a flat battery element in which a sheet-like or film-like positive electrode plate, a separator for holding an electrolyte, and a negative electrode plate are stacked is housed in a bag-like outer case formed of a laminate sheet mainly made of a resin film, and the positive electrode plate and A non-aqueous electrolyte secondary battery is disclosed in which a positive electrode lead and a negative electrode lead each having one end connected to a negative electrode plate are drawn out from a seal portion of an exterior case (Patent Document 1).
- the secondary battery When the thickness of the electrode expands due to repeated charge and discharge, the secondary battery has anisotropy with different shrinkage rates in the direction along the long side and the direction along the short side on the electrode stack surface. Yes. Further, in the above secondary battery, an excess space formed on the long side of the electrode laminate surface formed between the electrode laminate and the laminate outer case, and a short side of the electrode laminate surface are formed. When the thickness of the electrode expands in the surplus space, the volume of the surplus space formed on the short side of the laminated surface of the electrodes becomes too large, and an electrolyte or generated gas is generated in the surplus space. Concentrates and the battery reaction becomes non-uniform so that the durability of the battery is reduced.
- the problem to be solved by the present invention is a flat secondary that suppresses nonuniform battery reaction and improves cell durability even when the thickness of the electrode expands by repeated charge and discharge. It is to provide a battery.
- the present invention includes a laminated power generation element, and a pair of exterior members formed in a rectangular shape when viewed from the stacking direction of a plurality of electrodes while sealing the multilayer power generation element and an electrolyte solution.
- a contact portion including a contact surface that contacts the uppermost layer electrode, a sealing portion that overlaps the exterior members at the outer peripheral position of the exterior member, and an extending portion that extends from the contact portion to the seal portion. and, the average length of the extending portion (L a, L B) is, to solve the above problem by satisfying 1 ⁇ L a / L B ⁇ 2.
- the surplus space between the power generation element and the exterior member is defined in consideration of the anisotropy of the contraction of the electrode that accompanies repeated charge and discharge. Even if it is reduced in the direction, it is possible to suppress the excessive space formed on the short side of the laminated surface of the electrodes from becoming too large. As a result, it is possible to suppress the battery reaction from becoming uneven and improve the durability of the cell.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is the top view (A) of the secondary battery of FIG. 1, and a part (B) of sectional drawing, and is the figure which expanded surplus space, (a) shows the surplus space of a long side direction, (b) Indicates the surplus space in the short side direction.
- It is the top view and sectional drawing of the secondary battery which concern on this embodiment. It is the top view and sectional drawing of the secondary battery which concern on the modification of this embodiment. It is the top view and sectional drawing of the secondary battery which concern on the modification of this embodiment.
- 4 is a graph showing capacity retention ratios with respect to parameters (L A / L B ) in secondary batteries according to Examples 1 to 9 and Comparative Examples 1 to 4.
- 6 is a graph showing capacity retention ratios with respect to parameters (L A / L B ) in secondary batteries according to Examples 10 to 11 and Comparative Examples 5 and 6.
- 4 is a graph showing the relationship between parameter (b) and parameter (L / d) in the secondary batteries according to Examples 1 to 11 and Comparative Examples 3, 4, and 6.
- 5 is a graph showing the relationship between parameter (b) and parameter (a / d) in the secondary batteries according to Examples 1 to 11 and Comparative Examples 4 and 6.
- the secondary battery 1 is a lithium-based, flat plate, and laminated type flat (thin) battery. As shown in FIGS. 1 and 2, the five positive plates 11 and the ten sheets The separator 12, six negative plates 13, a positive terminal 14, a negative terminal 15, an upper exterior member 16, a lower exterior member 17, and an electrolyte (not shown) are included. In addition, the number of the positive electrode plate 11, the separator 12, and the negative electrode plate 13 is only an example, and may be another number.
- the positive electrode plate 11, the separator 12, and the negative electrode plate 13 constitute a power generation element 18, the positive electrode plate 11 and the negative electrode plate 13 constitute an electrode plate, and the upper exterior member 16 and the lower exterior member 17 constitute a pair of exterior members. Constitute.
- the positive electrode plate 11 constituting the power generating element 18 includes a positive electrode side current collector 11a extending to the positive electrode terminal 14, and positive electrode layers 11b and 11c formed on both main surfaces of a part of the positive electrode side current collector 11a, respectively.
- the positive electrode layers 11b and 11c are formed only on the portion of the positive electrode plate 11 that overlaps with the separator 12 substantially when the positive electrode plate 11, the separator 12 and the negative electrode plate 13 are stacked to form the power generation element 18.
- 11b and 11c may be formed.
- the positive electrode plate 11 and the positive electrode side current collector 11a are formed of a single conductor. However, the positive electrode plate 11 and the positive electrode side current collector 11a are formed separately and joined together. May be.
- the positive electrode side current collector 11a of the positive electrode plate 11 is made of an aluminum foil.
- the positive electrode side current collector 11a may be composed of an electrochemically stable metal foil such as an aluminum alloy foil, a copper foil, or a nickel foil.
- the positive electrode layers 11b and 11c of the positive electrode plate 11 contain lithium-nickel-manganese-cobalt composite oxide (hereinafter also referred to as “NMC composite oxide”) as a positive electrode active material.
- the NMC composite oxide has a layered crystal structure in which a lithium atomic layer and a transition metal (Mn, Ni, and Co are arranged in order) are stacked alternately via an oxygen atomic layer.
- the positive electrode active material may be a lithium composite oxide such as lithium nickelate (LiNiO2), lithium manganate (LiMnO2), or lithium cobaltate (LiCoO2), and a mixture of these.
- the positive electrode layers 11b and 11c are formed of a positive electrode active material containing an NMC composite oxide, a carbon black conductive agent such as ketjen black and acetylene black, an aqueous solution of polyvinylidene fluoride (PVdF) and polytetrafluoroethylene (PTFE).
- PVdF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- a mixture of a binder (adhesive) such as a dispersion and a slurry viscosity adjusting solvent such as N-methyl-2-pyrrolidone (NMP) is applied to both main surfaces of the positive electrode side current collector 11a, dried and It is formed by rolling.
- the negative electrode plate 13 constituting the power generation element 18 includes a negative electrode side current collector 13a extending to the negative electrode terminal 15 and negative electrode layers 13b and 13c formed on both main surfaces of a part of the negative electrode side current collector 13a, respectively. And have. Note that the negative electrode layers 13b and 13c of the negative electrode plate 13 may also be formed only on the portion of the negative electrode plate 13 that substantially overlaps with the separator 12 in the same manner as the positive electrode side. Further, in this example, the negative electrode plate 13 and the negative electrode side current collector 13a are formed of a single conductor. However, the negative electrode plate 13 and the negative electrode side current collector 13a are formed as separate bodies and are joined together. May be.
- the negative electrode side current collector 13a of the negative electrode plate 13 is made of copper foil.
- the negative electrode side current collector 13a may be made of an electrochemically stable metal foil such as a nickel foil, a stainless steel foil, or an iron foil in addition to the copper foil.
- the negative electrode layers 13b and 13c of the negative electrode plate 13 contain artificial graphite as a negative active material.
- the negative active material is, for example, Si alloy, Gr mixed with SIi, or occlusion and release of lithium ions such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, graphite, etc. Anything to do.
- the negative electrode layers 13b and 13c are made of a negative electrode active material containing artificial graphite, an ammonium salt of carboxymethyl cellulose and a styrene-butadiene copolymer latex as a binder, and dispersed in purified water to form a negative electrode active material slurry. Is applied to both main surfaces of the negative electrode side current collector 13a, and dried and rolled.
- the negative electrode active material slurry may use PVdF dispersed as a binder in NMP.
- the separator 12 of the power generation element 18 prevents a short circuit between the positive electrode plate 11 and the negative electrode plate 13 described above, and may have a function of holding an electrolyte.
- the separator 12 is a microporous film made of polyolefin such as polyethylene (PE) or polypropylene (PP), for example. When an overcurrent flows, the pores of the layer are blocked by the heat generation and the current is cut off. It also has a function.
- the separator 12 is not limited to a single-layer film such as polyolefin, but a three-layer structure in which a polypropylene film is sandwiched with a polyethylene film, a laminate of a polyolefin microporous film and an organic nonwoven fabric, or the like, a heat-resistant insulating layer A separator having a (ceramic layer) on the surface (so-called ceramic separator) can also be used.
- various functions such as an overcurrent prevention function, an electrolyte holding function, and a separator shape maintenance (stiffness improvement) function can be provided.
- the power generation element 18 described above is configured as a stack-side power generation element in which the positive electrode plates 11 and the negative electrode plates 13 are alternately stacked via the separator 12.
- the five positive plates 11 are respectively connected to the positive terminal 14 made of metal foil via the positive current collector 11a, while the six negative plates 13 are connected to the negative current collector 13a.
- each is connected to a negative electrode terminal 15 made of metal foil.
- the positive electrode terminal 14 and the negative electrode terminal 15 are not particularly limited as long as they are electrochemically stable metal materials.
- the positive electrode terminal 14 for example, a thickness of about 0.2 mm is used, as in the positive electrode side current collector 11 a described above.
- An aluminum foil, an aluminum alloy foil, a copper foil, a nickel foil, or the like can be given.
- the negative electrode terminal 15, like the above-mentioned negative electrode side collector 13a nickel foil, copper foil, stainless steel foil, iron foil, etc. of thickness about 0.2 mm can be mentioned, for example.
- the metal foil itself constituting the current collectors 11a and 13a of the electrode plates 11 and 13 is extended to the electrode terminals 14 and 15, in other words, one current collector foil 11a. , 13a is formed with a part of the electrode layer (positive electrode layer 11b, 11c or negative electrode layer 13b, 13c), the remaining end is used as a connecting member to the electrode terminal, and the electrode plates 11, 13 are used as the electrode terminals 14, 15
- the metal foil constituting the current collectors 11a and 13a located between the positive electrode layer and the negative electrode layer and the metal foil constituting the connecting member may be connected by different materials or components. .
- the power generation element 18 is housed and sealed in the upper exterior member 16 and the lower exterior member 17 together with the electrolyte. In addition, it is good also considering the part in which the positive electrode and the negative electrode substantially overlap through the separator among the electrode plates laminated
- the upper exterior member 16 and the lower exterior member 17 are a pair of members, and are a case for sealing the power generation element 18 and the electrolytic solution, and are configured as follows.
- the upper exterior member 16 and the lower exterior member 17 are each formed in a cup shape, and the upper exterior member 16 includes an abutting portion 161, extending portions 162 and 164, and a sealing portion 163. 165.
- the lower exterior member 17 includes a contact portion 171, extending portions 172 and 174, and sealing portions 173 and 175. Further, the upper exterior member 16 and the lower exterior member 17 are formed in a rectangular shape having a long side and a short side when viewed from the stacking direction of the electrode plates stacked on the power generation element 18 (z direction in FIG. 1). ing.
- the abutting portion 161 has an abutting surface that abuts the main surface of the positive electrode plate 11 (a surface parallel to the laminated surface of the electrode plates laminated on the power generation element 18: the xy plane in FIG. 1).
- the contact surface is parallel to the main surface of the negative electrode plate 13 located in the uppermost layer and has the same shape as the main surface.
- the contact surface of the contact portion 161 corresponds to the lower surface of the lower layer member of the multilayer contact portion 161.
- the contact portion 161 receives pressure directly from the negative electrode plate 13.
- the contact surface of the contact portion 101 is a portion that receives pressure from the power generation element 18 in the main surface of the exterior member 16 corresponding to the main surface of the positive electrode plate 11.
- the contact surface receives pressure as a reaction force from the power generation element 18 in a state where the power generation element 18 is sealed by the exterior members 16 and 17.
- the contact surface receives pressure from the power generation element 18 when the power generation element 18 expands due to the use of a battery.
- the sealing portions 163 and 165 are in close contact with the sealing portions 173 and 175 of the exterior member 17 while overlapping.
- the sealing portions 163 and 165 are configured to surround the power generation element 18 while being positioned on the outer periphery of the exterior member 16 in a plan view of the exterior member 16 as viewed from the z direction.
- the sealing parts 163 and 165 are located outside the contact part 161 via the extension parts 162 and 164 in a plan view of the exterior member 16 as viewed from the z direction.
- the sealing parts 163 and 165 are positioned between the contact part 161 and the contact part 171 at a height in the stacking direction (z direction) of the electrode plates of the power generation element 18.
- the sealing portions 163 and 165 are positioned at a height lower than the contact portion 161 in the stacking direction (z direction). In the example of FIG. 2, the sealing portions 163 and 165 are positioned at an intermediate portion between the contact portion 161 and the contact portion 171 at a height in the stacking direction (z direction).
- sealing parts 163 and 165 shown in FIG. 2 are located at both ends in the direction along the long side of the exterior member 16 formed in a rectangular shape.
- a pair of sealing portions similar to the sealing portions 163 and 165 are formed at both ends in the direction along the short side of the exterior member 16.
- the extending portion 162 is a portion where the exterior member 16 is extended from the contact portion 161 to the sealing portion 163, and includes the stacked power generation element 18 and the sealing portions 163 and 173 (of the exterior members 16 and 17. And a side surface).
- the extending part 162 has a flat part 162a and an inclined part 162b.
- the flat portion 162a is formed by a surface parallel to the contact surface of the contact portion 161.
- the inclined portion 162b is formed by a surface that is inclined with respect to the parallel surface of the flat portion 162a.
- the exterior member 16 is formed by extending along the contact surface of the contact portion 161 to form the flat portion 162a, and bends at the outer edge of the flat portion 162a and extends toward the sealing portion 163.
- a portion 162b is formed.
- the flat portion 162a functions as a margin for forming a space between the stacked power generation element and the sealing portions 163 and 173 (side surfaces of the exterior members 16 and 17), and the flat portion 162a is provided. Thereby, the said space has expanded toward the direction (x direction or y direction) along the lamination surface of an electrode.
- the extended portion 164 is a portion where the exterior member 16 extends from the contact portion 161 to the sealing portion 165, and includes a flat portion 164a and an inclined portion 164b.
- the configurations of the extending portion 164, the plane portion 164a, and the inclined portion 164b are the same as the configurations of the extending portion 162, the plane portion 162a, and the inclined portion 162b described above, and thus the description thereof is omitted.
- the extending portion and the sealing portion are not limited to positions at both ends in the direction along the long side of the exterior member 16, but are also formed at positions at both ends in the direction along the short side of the exterior member 16.
- the exterior member 17 is a member that seals the power generation element 18 and the electrolyte from the opposite side of the exterior member 16. Since the configuration of the exterior member 17 is the same as the configuration of the exterior member 16, the description thereof is omitted.
- the configuration of the contact portion 171 is the same as the configuration of the contact portion 161
- the configuration of the extending portions 172 and 174 is the same as the configuration of the extending portions 162 and 164
- the configuration of the sealing portions 173 and 175. Is the same as the configuration of the sealing portions 163 and 165.
- the upper exterior member 16 and the lower exterior member 17 of this example are both made of polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer from the inside to the outside of the secondary battery 1.
- An inner layer composed of a resin film excellent in electrolytic solution resistance and heat-fusibility, an intermediate layer composed of a metal foil such as aluminum, and an electrical insulation such as a polyamide resin or a polyester resin
- a three-layer structure composed of an outer layer made of a resin film having excellent properties.
- both the upper exterior member 16 and the lower exterior member 17 are made of resin such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer on one surface (inner surface of the secondary battery 1) of a metal foil such as aluminum foil. And the other surface (the outer surface of the secondary battery 1) is laminated with a polyamide resin or a polyester resin, and is formed of a flexible material such as a resin-metal thin film laminate material.
- the inner layers of the exterior members 16 and 17 are made of, for example, a resin such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer, so that good fusion properties with the metal electrode terminals 14 and 15 can be obtained. It can be secured.
- the positive terminal 14 is led out from one end of the sealed exterior members 16 and 17, and the negative terminal 15 is led out from the other end. Since there is a gap in the fused portion between the upper exterior member 16 and the lower exterior member 17 by the thickness of the electrode terminals 14 and 15, the electrode terminals 14 and 15 are maintained in order to maintain the sealing performance inside the secondary battery 1.
- a seal film made of polyethylene, polypropylene, or the like may be interposed in a portion where the exterior members 16 and 17 are in contact with each other. It is preferable from the viewpoint of heat-fusibility that the seal film is made of a resin of the same system as the resin constituting the exterior members 16 and 17 in both the positive electrode terminal 14 and the negative electrode terminal 15.
- These exterior members 16, 17 enclose the power generation element 18, part of the positive electrode terminal 14 and part of the negative electrode terminal 15, so that the internal liquid space formed by the exterior members 16, 17 contains an organic liquid solvent. While injecting a liquid electrolyte having a lithium salt such as lithium chlorate, lithium borofluoride or lithium hexafluorophosphate as a solute, the space formed by the exterior members 16 and 17 is sucked into a vacuum state, The outer peripheral edges of the members 16 and 17 are heat-sealed by hot pressing and sealed.
- a liquid electrolyte having a lithium salt such as lithium chlorate, lithium borofluoride or lithium hexafluorophosphate
- organic liquid solvents examples include propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), ester solvents such as diethyl carbonate (DEC) and ethyl methyl carbonate (EMC), and vinylene carbonate (VC ), Fluoroethylene carbonate (FEC), propane sultone (PS) and the like added as additives, but the organic liquid solvent of this example is not limited to this, An organic liquid solvent prepared by mixing and preparing an ether solvent such as butylactone ( ⁇ -BL) and dietochiethane (DEE) can also be used. It is desirable to add various additives such as vinylene carbonate (VC), fluoroethylene carbonate (FEC), 1,3-propane sultone (PS) to the organic liquid solvent.
- PC propylene carbonate
- EC ethylene carbonate
- DMC dimethyl carbonate
- EMC diethyl carbonate
- EMC ethyl methyl carbonate
- VC vinylene carbonate
- the volume energy density and the rated discharge capacity of the secondary battery 1 will be described.
- a running distance (cruising range) by one charge is several hundred km.
- the secondary battery 1 preferably has a volume energy density of 157 Wh / L or more and a rated capacity of 20 Wh or more.
- the secondary battery 1 is a flat laminated battery, and the ratio of the battery area to the rated capacity (projected area of the battery including the battery outer casing) is 5 cm 2 / Ah or more, and The rated capacity is 3 Ah or more.
- the aspect ratio of the laminated surface of the rectangular electrodes is preferably 1 to 3, more preferably 1 to 2.
- the electrode aspect ratio is defined as the aspect ratio of the rectangular positive electrode active material layer.
- FIG. 3 is a plan view (A) of the secondary battery and an enlarged cross-sectional view (B) of the ⁇ and ⁇ portions of the secondary battery.
- 3A shows the state of both end portions in the direction along the long side
- FIG. 3B shows the state of both end portions in the direction along the short side.
- the surplus space is a space formed between the stacked power generation element 18 and the side surfaces (corresponding to the extending portions) of the exterior members 16 and 17.
- the long side and the short side represent rectangular sides as the shape of the exterior members 16 and 17 when viewed from the electrode stacking direction (z direction).
- the t 1 indicates the time (t) until the expansion from the initial state.
- the thickness of the power generation element 18 is d 0
- the length of the flat portion 162 a located at the end in the direction along the long side is a 0A .
- the length of the plane part 162a located in the edge part of the direction along a short side is a0B .
- the thickness of the power generation element 18 corresponds to the thickness from the electrode plate positioned at the same height as the sealing portions 163 and 173 to the electrode positioned in the uppermost layer in the electrode stacking direction (z direction), It is half the total thickness of the power generation element 18.
- the length of the plane portion 162a is the length of the plane portion 162a in the direction along the parallel plane (x direction).
- the power generation element 18 expands in the z direction, so that the thickness of the power generation element 18 changes from d 0 to d 1 (> d 0 ).
- the width of the power generation element 18 in the x direction decreases with expansion in the z direction. That is, the power generating element 18 expands in the z direction and contracts in the x direction.
- the width of the power generation element 18 in the y direction decreases with expansion in the z direction. That is, the power generating element 18 expands in the z direction and contracts in the y direction.
- the laminated surface of the electrode plates constituting the power generation element 18 is long in the long side direction and short in the short side direction. Therefore, the collection speed of the electrode plate in the direction along the xy plane is faster in the direction along the long side than in the direction along the short side.
- the contraction speed in the long side direction is p and the contraction speed in the short side direction is q, p> q.
- the length (a A ) of the flat portion 162a in the long side direction after shrinkage and the length (a B ) of the flat portion 162a in the short side direction are expressed by the expressions shown in FIG.
- the length (a A ) of 162a is shorter than the length (a B ) of the plane portion 162a.
- the power generation element configured in a rectangular shape as viewed from the stacking direction of the electrode plates has anisotropy (a property that the contraction speed is different between the long side direction and the short side direction). Therefore, unlike the secondary battery 1 according to this embodiment, for example, the volume of the first surplus space located at both ends in the long side direction is compared with the volume of the second surplus space located at both ends in the short side direction. If it is small, the volume of the first surplus space becomes smaller as the battery is used, and the volume of the surplus space is impaired. And since the electrolyte solution and the gas generated inside the battery are biased to one surplus volume, the battery reaction is not uniform and the durability is lowered.
- the secondary battery 1 takes into account the above-described anisotropy, and the volume balance of the surplus space after the expansion of the power generation element (for example, the surplus space becomes longer than the length of the exterior member due to expansion of the power generation element).
- a pair of extensions located at both ends in the long side direction so that the volume of the surplus space formed on the short side of the laminated surface of the electrode does not become too large even if it is reduced in the side direction)
- the relationship between the average length (L A ) of the portions and the average length (L B ) of the pair of extending portions located at both ends in the short side direction is defined so as to satisfy the following formula (1).
- the durability of the cell is improved.
- FIG. 4 is a plan view of the secondary battery 1, a cross-sectional view taken along the xz plane along the long side, and a cross-sectional view taken along the xz plane along the short side. parameters included in 4) (L a, L B , d, a a, which is a diagram for explaining a a B).
- L A1 is the length of the extending portion 162, the long side direction of the flat portion 162a And the length of the inclined portion 162b in the long side direction.
- the plane part 162a and the inclined part 162b in the long side direction are a flat part and an inclined part located at one end of both ends in the direction along the long side in the first cross section.
- L A2 is the length of the extending portion 164, and is the length obtained by combining the length of the flat portion 164a in the long side direction and the length of the inclined portion 164b in the long side direction.
- L B1 is the length of the extending portion 162, the length of the flat portion 162 a in the short side direction, and the short side direction It is the length which combined the length of the inclination part 162b.
- the plane part 162a and the inclined part 162b in the short side direction are a plane part and an inclined part that are located at one end of both ends in the direction along the short side in the second cross section.
- L B2 is the length of the extending portion 164, and the length of the short side direction of the flat portion 164a, a combined length of an inclined portion length of 164b in the short side direction.
- the relationship between L A , L B , and d is preferably defined so as to satisfy the following condition 1.
- d is the thickness of the power generation element 18, and in the electrode stacking direction (z direction), from the electrode plate located at the same height as the sealing portions 163 and 173 to the electrode plate located in the uppermost layer. It is the thickness or the thickness from the electrode plate located at the same height as the sealing portions 163 and 173 to the electrode plate located at the lowermost layer (see FIG. 4).
- b is the length from the electrode located between the plurality of sealing portions 163, 173, 165, 175 to the sealing portions 163, 173, or between the sealing portions 163, 173, 165, 175. It is the length from the electrode to seal part 165,175.
- the first and second straight lines indicate the characteristic of the maximum value of L A / d with respect to b or the characteristic of the maximum value of L B / d with respect to b. The first and second straight lines will be described in examples.
- the surplus space is expanded while maintaining the volume balance with respect to the thickness of the power generation element 18, so when the power generation element 18 expands, the portion that contacts the power generation element 18 or the sealing portion 163 or the like Such stress can be relieved. For this reason, even when the exterior member 16 is deformed, the pressure applied to the power generation element 18 is suppressed from becoming non-uniform, the battery reaction can be made uniform, and the durability of the cell is improved.
- the relationship between a A and a B is preferably defined so as to satisfy the following formula (2). 1 ⁇ a A / a B ⁇ 7 (2)
- a A1 is the length of the long side of the flat portion 162a
- a A2 is the length of the long side of the flat portion 164a.
- a B1 is the length of the plane part 162a in the short side direction
- a B2 is the length of the plane part 164a in the short side direction.
- the relationships a A , a B, and d are preferably defined so as to satisfy the following condition 2.
- the third straight line indicates the characteristic of the minimum value of a A / d with respect to b or the characteristic of the minimum value of a B / d with respect to b.
- the fourth straight line shows the characteristic of the maximum value of a A / d with respect to b or the characteristic of the maximum value of a B / d with respect to b.
- the third and fourth straight lines will be described in examples.
- the definition of the shape of the secondary battery 1 represented by the formulas (1) and (2) and the definition of the shape of the secondary battery 1 satisfying the conditions 1 and 2 are limited to the secondary battery 1 shown in FIGS.
- the present invention can also be applied to the secondary battery 1 according to Modification Example 1 below.
- the definition of the shape of the secondary battery 1 represented by the expression (1) and the condition 1 is not limited to the secondary battery 1 illustrated in FIGS. 1 and 2, but is applied to the secondary battery 1 according to Modification 2 below. Is also applicable.
- FIG. 5 is a plan view of the secondary battery 1 according to Modification 1, a cross-sectional view taken along the xz plane along the long side, and a cross-sectional view taken along the xz plane along the short side.
- (1) parameters included to (4) are diagrams for (L a, L B, d , a a, a B) will be described.
- the exterior member 17 is formed in a single plate shape, and the main surface of the exterior member 17 is parallel to the laminated surface of the electrode plates of the power generation element 18.
- the inside of the main surface is in contact with the lowermost electrode plate of the electrode plates constituting the power generation element 18.
- sealing portions 173 and 175 that overlap with the sealing portions 163 and 165 of the exterior member 16 are formed on the outer periphery of the main surface. The sealing portions 173 and 175 are in close contact with the sealing portions 163 and 165.
- the upper exterior member 16 is the same as the upper exterior member 16 shown in FIG. 4, and the same applies to each parameter (L A , L B , d, a A , a B ).
- FIG. 6 is a plan view of the secondary battery 1 according to the modified example 2, a cross-sectional view taken along the xz plane along the long side, and a cross-sectional view taken along the xz plane along the short side.
- FIG. 5 is a diagram for explaining parameters (L A , L B , d) included in (1) to (4).
- the upper exterior member 16 has a contact portion 161, curved portions 166 and 167, and sealing portions 163 and 165.
- the lower exterior member 17 includes a contact portion 171, a curved portion 176, and sealing portions 173 and 175.
- the contact portions 161 and 171 are the same as the contact portions 161 and 171 according to this embodiment, and the sealing portions 163, 165, 173, and 175 are the sealing portions 163, 165, 173, and Since this is the same as 175, description of the configuration is omitted.
- the curved portion 166 extends from the outer edge of the contact portion 161 to the sealing portion 163 while being curved. Further, in the cross section obtained by cutting the secondary battery 1 along the xz plane, the curved portion 166 is formed to have a curve that swells outward from the inside of the secondary battery 1 as shown in FIG. . Since the configuration of the bending portion 167 is the same as that of the bending portion 166, the description thereof is omitted.
- the exterior member 17 has curved portions 176 and 177 as well as the exterior member 16, and seals the power generation element 18 from the opposite side of the exterior member 16.
- the abutting portion 171, the bending portions 176 and 177, and the sealing portions 173 and 175 constituting the exterior member 17 are the abutting portion 161, the bending portions 166 and 167, and the sealing portions 163 and 165 that constitute the exterior member 16. Since it is the same as that of FIG.
- L A1 is the length of the bending portion 166 and L A2 is the length of the bending portion 167 in the cross section when cut along the xz plane along the long side.
- L A1 is the length of the bending portion 166
- L A2 is the length of the bending portion 167.
- NMC complex oxide LiNi 0.5 Mn 0.3 Co 0.2 O 2 (average particle size: 10 ⁇ m)
- PVdF polyvinylidene fluoride
- a positive electrode active material layer was formed on the back surface, and a positive electrode plate 11 having a positive electrode active material layer formed on both surfaces of the positive electrode current collector was produced.
- the size of the main surface of the positive electrode plate 11 was 215 mm in length and 190 mm in width.
- the negative electrode active material slurry was prepared by dispersing 96.5% by weight of artificial graphite as the negative electrode active material, 1.5% by weight of ammonium salt of carboxymethyl cellulose and 2.0% by weight of styrene butadiene copolymer latex as the binder in purified water. did.
- This negative electrode active material slurry was applied to a copper foil (thickness 10 ⁇ m) serving as a negative electrode current collector, dried at 120 ° C., and then compression molded with a roll press to produce a negative electrode plate 13 having a negative electrode active material layer of 10 mg / cm 2. did.
- a negative electrode active material layer was formed on the back surface, and a negative electrode plate 13 having a negative electrode active material layer formed on both sides of the negative electrode current collector was produced.
- the size of the main surface of the negative electrode plate 13 was 219 mm in length and 194 mm in width.
- the power generation element 18 was produced by alternately laminating the positive electrode produced above and the negative electrode produced above via a separator (20 positive electrode layers and 21 negative electrode layers).
- the separator was 223 mm long and 198 mm wide.
- the obtained power generation element 18 (4) was placed in an aluminum laminate sheet bag, and an electrolytic solution was injected.
- an electrolytic solution a solution obtained by dissolving 1.0M LiPF6 in a mixed solvent (volume ratio 1: 1: 1) of ethylene carbonate (EC): diethyl carbonate (DEC): ethyl methyl carbonate (EMC) was used.
- the laminated lithium ion secondary battery was completed by sealing the opening of the aluminum laminate back so that the current extraction tabs connected to both electrodes were led out under vacuum conditions.
- the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4) is 256 mm, the length of the outer dimension in the y direction (y 4 in FIG. 4 ) is 210 mm, and the height in the z direction is high.
- the thickness was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 except for the sealing portion of the exterior member 16 is 231 mm in the x-direction length (x 3 in FIG. 4).
- the length in the y direction (y 3 in FIG. 4) was 200 mm.
- the size of the portion formed by the contact portion 161 and the flat portions 162a and 164a of the exterior member 16 is the length in the x direction (x 2 in FIG. 4).
- the length in the y direction (y 2 in FIG. 4) was 194 mm.
- the size of the exterior member 17 was the same as that of the exterior member 16.
- the size of the stacked power generation element 18 is such that the length in the x direction (x 1 in FIG. 4) is 215 mm, the length in the y direction (y 1 in FIG. 4) is 190 mm, and the length in the z direction (FIG. 4).
- the length obtained by doubling d) was 8 mm.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 280 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- capacitance of the secondary battery 1 is confirmed, and the capacity
- the secondary battery 1 was evaluated by calculating (discharge capacity) ⁇ 100%).
- Example 1 The secondary battery 1 manufactured as described above is referred to as Example 1.
- Example 2 In the secondary battery 1 according to Example 2, the size of the upper surface portion of the exterior member 16 is such that the length in the x direction (x 2 in FIG. 4) is 223 mm and the length in the y direction (y 2 in FIG. 4). It was set to 192 mm. Other sizes and the number of electrode layers are the same as those in the first embodiment.
- Example 3 In the secondary battery 1 according to Example 3, the size of the exterior member 16 is such that the length in the x direction of the outer dimension (x 4 in FIG. 4 ) is 260 mm, and the length in the y direction of the outer dimension (in FIG. 4). y 4 ) was 210 mm, and the height in the z direction was 4 mm.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 284 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Example 4 In the secondary battery 1 according to Example 4, the size of the exterior member 16 is such that the length in the x direction of the outer dimension (x 4 in FIG. 4 ) is 260 mm, and the length in the y direction of the outer dimension (in FIG. 4). y 4 ) was 208 mm, and the height in the z direction was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 235 mm and the length in the y direction (y 3 in FIG. 4) is 198 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length in the x direction of the secondary battery 1 including the electrode terminals 14 and 15 was 284 mm
- the length (width) in the y direction was 208 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Example 5 In the secondary battery 1 according to Example 5, the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4 ) is 250 mm, and the length of the outer dimension in the y direction (in FIG. 4). y 4 ) was 210 mm, and the height in the z direction was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 225 mm and the length in the y direction (y 3 in FIG. 4) is 200 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 274 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Example 6 In the secondary battery 1 according to Example 6, the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4 ) is 250 mm, and the length of the outer dimension in the y direction (in FIG. 4). y 4 ) was 210 mm, and the height in the z direction was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 225 mm and the length in the y direction (y 3 in FIG. 4) is 200 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 274 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Example 7 In the secondary battery 1 according to Example 7, the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4 ) is 255 mm, and the length of the outer dimension in the y direction (in FIG. 4). y 4 ) was 210 mm, and the height in the z direction was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the x-direction length (x 3 in FIG. 4) is 230 mm, and the y-direction length (y 3 in FIG. 4) is 200 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 279 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Example 8 In the secondary battery 1 according to Example 8, the size of the exterior member 16 is such that the outer dimension in the x direction (x 4 in FIG. 4 ) is 253 mm, and the outer dimension in the y direction (in FIG. 4). y 4 ) was 210 mm, and the height in the z direction was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 228 mm, and the length in the y direction (y 3 in FIG. 4) is 200 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 277 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Example 9 In the secondary battery 1 according to Example 9, the size of the main surface of the positive electrode plate 11 was 205 mm in length and 110 mm in width.
- the main surface of the negative electrode plate 13 had a length of 209 mm and a width of 114 mm.
- the size of the separator was 213 mm in length and 118 mm in width.
- the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4) is 246 mm, the length of the outer dimension in the y direction (y 4 in FIG. 4 ) is 130 mm, and the height in the z direction is high.
- the thickness was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 221 mm and the length in the y direction (y 3 in FIG. 4) is 120 mm. It was. As for the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG. 4) was 2211 mm, and the length in the y direction (y 2 in FIG. 4) was 114 mm. The length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 270 mm, the length (width) in the y direction was 130 mm, and the length (thickness) in the z direction was 8 mm. Other sizes are the same as those in the first embodiment.
- Example 10 In the secondary battery 1 according to Example 10, the size of the main surface of the positive electrode plate 11 was 205 mm in length and 110 mm in width.
- the main surface of the negative electrode plate 13 had a length of 209 mm and a width of 114 mm.
- the size of the separator was 213 mm in length and 118 mm in width.
- the size of the outer member 16 the length of the x-direction of the outer size of the (x 4 in FIG. 4) and 250 mm, length in the y direction of the outer size of the (y 4 in FIG. 4) and 130 mm, in the z-direction height
- the thickness was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 225 mm and the length in the y direction (y 3 in FIG. 4) is 120 mm. It was. As for the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG. 4) was 215 mm, and the length in the y direction (y 2 in FIG. 4) was 112 mm. The length in the x direction of the secondary battery 1 including the electrode terminals 14 and 15 was 274 mm, the length (width) in the y direction was 130 mm, and the length (thickness) in the z direction was 8 mm. Other sizes are the same as those in the first embodiment.
- Example 11 In the secondary battery 1 according to Example 11, the size of the main surface of the positive electrode plate 11 was 205 mm in length and 110 mm in width.
- the main surface of the negative electrode plate 13 had a length of 209 mm and a width of 114 mm.
- the size of the separator was 213 mm in length and 118 mm in width.
- the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4) is 240 mm, the length of the outer dimension in the y direction (y 4 in FIG. 4 ) is 130 mm, and the height in the z direction is high.
- the thickness was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 215 mm, and the length in the y direction (y 3 in FIG. 4) is 120 mm. It was. As for the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG. 4) was 211 mm, and the length in the y direction (y 2 in FIG. 4) was 112 mm. The length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 264 mm, the length (width) in the y direction was 130 mm, and the length (thickness) in the z direction was 8 mm. Other sizes are the same as those in the first embodiment.
- the size of the exterior member 16 is such that the length in the x direction of the outer dimension (x 4 in FIG. 4 ) is 250 mm, and the length in the y direction of the outer dimension (in FIG. 4). the y 4) and 210 mm, and a 4mm height in the z direction.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 225 mm and the length in the y direction (y 3 in FIG. 4) is 200 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 274 mm
- the length (width) in the y direction was 210 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- the outer member 16 has an outer dimension in the x direction (x 4 in FIG. 4 ) of 250 mm and an outer dimension in the y direction (in FIG. 4).
- y 4 was 216 mm
- the height in the z direction was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 225 mm and the length in the y direction (y 3 in FIG. 4) is 206 mm. It was.
- the size of the upper surface portion of the exterior member 16 the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 274 mm
- the length (width) in the y direction was 216 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Comparative Example 3 In the secondary battery 1 according to Comparative Example 3, the size of the exterior member 16 is such that the outer dimension in the x direction (x 4 in FIG. 4 ) is 264 mm and the outer dimension in the y direction (in FIG. 4). y 4 ) was 208 mm, and the height in the z direction was 4 mm. The size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 239 mm, and the length in the y direction (y 3 in FIG. 4) is 198 mm. It was. As for the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 288 mm
- the length (width) in the y direction was 208 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Comparative Example 4 In the secondary battery 1 according to Comparative Example 4, the size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4 ) is 264 mm, and the length of the outer dimension in the y direction (in FIG. 4). y 4 ) was 208 mm, and the height in the z direction was 4 mm. The size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 239 mm, and the length in the y direction (y 3 in FIG. 4) is 198 mm. It was. As for the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG.
- the length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 288 mm
- the length (width) in the y direction was 208 mm
- the length (thickness) in the z direction was 8 mm.
- Other sizes are the same as those in the first embodiment.
- Comparative Example 5 In the secondary battery 1 according to Comparative Example 5, the size of the main surface of the positive electrode plate 11 was 205 mm in length and 110 mm in width. The main surface of the negative electrode plate 13 had a length of 209 mm and a width of 114 mm. The size of the separator was 213 mm in length and 118 mm in width. The size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4) is 240 mm, the length of the outer dimension in the y direction (y 4 in FIG. 4 ) is 136 mm, and the height in the z direction is high. The thickness was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 215 mm and the length in the y direction (y 3 in FIG. 4) is 126 mm. It was. Regarding the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG. 4) was 209 mm, and the length in the y direction (y 2 in FIG. 4) was 118 mm. The length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 264 mm, the length (width) in the y direction was 136 mm, and the length (thickness) in the z direction was 8 mm. Other sizes are the same as those in the first embodiment.
- Comparative Example 6 In the secondary battery 1 according to Comparative Example 6, the size of the main surface of the positive electrode plate 11 was 205 mm in length and 110 mm in width. The main surface of the negative electrode plate 13 had a length of 209 mm and a width of 114 mm. The size of the separator was 213 mm in length and 118 mm in width. The size of the exterior member 16 is such that the length of the outer dimension in the x direction (x 4 in FIG. 4) is 254 mm, the length of the outer dimension in the y direction (y 4 in FIG. 4 ) is 128 mm, and the height in the z direction is high. The thickness was 4 mm.
- the size of the internal space of the secondary battery 1 that seals the power generation element 18 is such that the length in the x direction (x 3 in FIG. 4) is 229 mm, and the length in the y direction (y 3 in FIG. 4) is 118 mm. It was. As for the size of the upper surface portion of the exterior member 16, the length in the x direction (x 2 in FIG. 4) was 217 mm, and the length in the y direction (y 2 in FIG. 4) was 112 mm. The length of the secondary battery 1 including the electrode terminals 14 and 15 in the x direction was 278 mm, the length (width) in the y direction was 128 mm, and the length (thickness) in the z direction was 8 mm. Other sizes are the same as those in the first embodiment.
- the long side and the short side of the electrode represent the length of the long side and the short side of the laminated surface of the electrode plate, respectively.
- FIG. 7 shows the capacity retention ratio with respect to L A / L B for the secondary batteries 1 according to Examples 1 to 8 and Comparative Examples 1 to 4 (the size of the laminated surface of the electrode plates is 215 ⁇ 190).
- FIG. 8 shows the capacity retention ratio with respect to L A / L B for the secondary batteries 1 according to Examples 9 to 11 and Comparative Examples 5 and 6 (the size of the laminated surface of the electrode plates is 205 ⁇ 110).
- a high capacity maintenance ratio (capacity maintenance ratio of 80% or more) could be obtained.
- a high capacity retention rate (capacity retention rate of 80% or more) is obtained after using 1 1000 cyc. I was able to.
- a high capacity maintenance ratio (capacity maintenance ratio of 80% or more) can be obtained after using 1000 cyc. It was. Further, in the secondary battery in which the parameters (a A , a B , d) are defined so as to satisfy the formula (4), 1 should obtain a high capacity maintenance ratio (capacity maintenance ratio of 80% or more) after using 1000 cyc. I was able to.
- the parameter (L A, L B) has the formula (1) does not satisfy the secondary battery 1 (Comparative Examples 1-6), after using 1000 cycles, resulted in capacity retention is poor.
- FIG. 9 shows the evaluation results of the value of L A / d for b and the value of L B / d for b for Examples 1 to 11 and Comparative Examples 4 and 6.
- the horizontal axis indicates b, and the vertical axis indicates L / d.
- L in the vertical axis is obtained by replacing the L A and L B, respectively.
- Example 1 A represents the value of L A / d for b
- Example 1 B represents the value of L B / d for b.
- Other examples and comparative examples are similarly represented. Note that Comparative Examples 1, 2, and 5 are not shown in the condition 1 because L A / d ⁇ L B / d is not satisfied.
- the minimum value and the maximum value of L / d with respect to b are respectively defined within the range of 4 ⁇ b ⁇ 10.
- the minimum value is a ratio of b and L / d that represents the shape of the surplus space that can provide a desired capacity retention rate (for example, 80%) even in a secondary battery after a predetermined number of times. .
- the capacity maintenance rate is a desired capacity maintenance rate. Less than.
- the maximum value represents the shape of the surplus space that can make the battery reaction uniform by the ratio of b and L / d.
- the value of L / d for b is greater than or equal to the maximum value, the volume of the surplus space becomes too large, the battery reaction becomes non-uniform, and the durability of the battery decreases.
- Example 1 to 11 and Comparative Examples 4 and 6 the value of a A / d for b and the value of a B / d for b were also evaluated.
- the evaluation results are shown in FIG. A vertical axis is obtained by replacing each of a A and a B.
- the display of Example 1 A etc. is the same as that of FIG.
- Comparative Examples 1, 2, and 5 are not shown in the condition 2 because a A / d ⁇ a B / d is not satisfied.
- the definition of the minimum and maximum values of a / d for b is the same as the minimum and maximum values of L / d for b.
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Abstract
Description
1≦LA/LB≦2 (1)
1≦aA/aB≦7 (2)
NMC複合酸化物(LiNi0.5Mn0.3Co0.2O2(平均粒子径:10μm))を90重量%、導電助剤としてケッチェンブラックを5重量%、バインダーとしてポリフッ化ビニリデン(PVdF)を5重量%、およびスラリー粘度調整溶媒であるNMPを適量混合して、正極活物質スラリーを調整し、得られた正極活物質スラリーを集電体であるアルミニウム箔(厚さ20μm)に塗布し、120℃乾燥後、ロールプレス機で圧縮成型して、正極活物質層18mg/cm2の正極板11を作製した。裏面にも同様に正極活物質層を形成し、正極集電体の両面に正極活物質層が形成されてなる正極板11を作製した。なお、正極板11の主面の大きさは、長さ215mmとし、幅190mmとした。
負極活物質として、人造グラファイト96.5重量%、バインダーとしてカルボキシメチルセルロースのアンモニウム塩1.5重量%およびスチレンブタジエン共重合体ラテックス2.0重量%を精製水中に分散させて負極活物質スラリーを調整した。この負極活物質スラリーを負極集電体となる銅箔(厚さ10μm)に塗布し、120℃乾燥後、ロールプレス機で圧縮成型して、負極活物質層10mg/cm2の負極板13を作製した。裏面にも同様に負極活物質層を形成し、負極集電体の両面に負極活物質層が形成されてなる負極板13を作製した。なお、負極板13の主面の大きさは、長さ219mmとし、幅194mmとした。
上記で作製した正極と、上記で作製した負極とを、セパレータを介して交互に積層(正極20層、負極21層)することによって発電要素18を作製した。セパレータの大きさは、長さ223mmとし、幅198mmとした。
完成した二次電池1を、25℃に設定した恒温槽で、0.2C_CCCV充電(上限電圧4.15V 8時間)を行った後、0.2C_CC放電(下限電圧2.5Vcut)を行い、初回の充放電容量を確認した。また、体積(アルキメデス法)、厚み測定を実施した。
<耐久試験>
完成した二次電池1に対し、45℃に設定した恒温槽において、1C_CCCV充電(上限電圧4.15V、2時間)、1C_CC放電(下限電圧2.5Vcut)を1000cyc実施した。そして、充放電を1000cyc実施した後に、二次電池1の充放電容量を確認し、初回の充放電容量に対する容量維持率((初回の充放電容量)/(充放電を1000cyc実施した後の充放電容量)×100%)を演算することで、二次電池1を評価した。
上記のように作製した二次電池1を実施例1とする。
実施例2に係る二次電池1では、外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を223mmとし、y方向の長さ(図4のy2)を192mmとした。それ以外の大きさ及び電極の層数は実施例1と同じである。
実施例3に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を260mmとし、外寸のy方向の長さ(図4のy4)を210mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を235mmとし、y方向の長さ(図4のy3)を200mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を225mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは284mmとし、y方向の長さ(幅)は210mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例4に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を260mmとし、外寸のy方向の長さ(図4のy4)を208mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を235mmとし、y方向の長さ(図4のy3)を198mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を225mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは284mmとし、y方向の長さ(幅)は208mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例5に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を250mmとし、外寸のy方向の長さ(図4のy4)を210mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を225mmとし、y方向の長さ(図4のy3)を200mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を221mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは274mmとし、y方向の長さ(幅)は210mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例6に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を250mmとし、外寸のy方向の長さ(図4のy4)を210mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を225mmとし、y方向の長さ(図4のy3)を200mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を217mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは274mmとし、y方向の長さ(幅)は210mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例7に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を255mmとし、外寸のy方向の長さ(図4のy4)を210mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を230mmとし、y方向の長さ(図4のy3)を200mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を221mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは279mmとし、y方向の長さ(幅)は210mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例8に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を253mmとし、外寸のy方向の長さ(図4のy4)を210mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を228mmとし、y方向の長さ(図4のy3)を200mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を219mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは277mmとし、y方向の長さ(幅)は210mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例9に係る二次電池1では、正極板11の主面の大きさは、長さ205mmとし、幅110mmとした。負極板13の主面の大きさは、長さ209mmとし、幅114mmとした。セパレータの大きさは、長さ213mmとし、幅118mmとした。外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を246mmとし、外寸のy方向の長さ(図4のy4)を130mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を221mmとし、y方向の長さ(図4のy3)を120mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を2211mmとし、y方向の長さ(図4のy2)を114mmとした。電極端子14、15を含めた二次電池1のx方向の長さは270mmとし、y方向の長さ(幅)は130mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例10に係る二次電池1では、正極板11の主面の大きさは、長さ205mmとし、幅110mmとした。負極板13の主面の大きさは、長さ209mmとし、幅114mmとした。セパレータの大きさは、長さ213mmとし、幅118mmとした。外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を250mmとし、外寸のy方向の長さ(図4のy4)を130mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を225mmとし、y方向の長さ(図4のy3)を120mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を215mmとし、y方向の長さ(図4のy2)を112mmとした。電極端子14、15を含めた二次電池1のx方向の長さは274mmとし、y方向の長さ(幅)は130mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
実施例11に係る二次電池1では、正極板11の主面の大きさは、長さ205mmとし、幅110mmとした。負極板13の主面の大きさは、長さ209mmとし、幅114mmとした。セパレータの大きさは、長さ213mmとし、幅118mmとした。外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を240mmとし、外寸のy方向の長さ(図4のy4)を130mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を215mmとし、y方向の長さ(図4のy3)を120mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を211mmとし、y方向の長さ(図4のy2)を112mmとした。電極端子14、15を含めた二次電池1のx方向の長さは264mmとし、y方向の長さ(幅)は130mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
比較例1に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を250mmとし、外寸のy方向の長さ(図4のy4)を210mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を225mmとし、y方向の長さ(図4のy3)を200mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を217mmとし、y方向の長さ(図4のy2)を196mmとした。電極端子14、15を含めた二次電池1のx方向の長さは274mmとし、y方向の長さ(幅)は210mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
比較例2に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を250mmとし、外寸のy方向の長さ(図4のy4)を216mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を225mmとし、y方向の長さ(図4のy3)を206mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を217mmとし、y方向の長さ(図4のy2)を196mmとした。電極端子14、15を含めた二次電池1のx方向の長さは274mmとし、y方向の長さ(幅)は216mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
比較例3に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を264mmとし、外寸のy方向の長さ(図4のy4)を208mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を239mmとし、y方向の長さ(図4のy3)を198mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を229mmとし、y方向の長さ(図4のy2)を194mmとした。電極端子14、15を含めた二次電池1のx方向の長さは288mmとし、y方向の長さ(幅)は208mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
比較例4に係る二次電池1では、外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を264mmとし、外寸のy方向の長さ(図4のy4)を208mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を239mmとし、y方向の長さ(図4のy3)を198mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を227mmとし、y方向の長さ(図4のy2)を192mmとした。電極端子14、15を含めた二次電池1のx方向の長さは288mmとし、y方向の長さ(幅)は208mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
比較例5に係る二次電池1では、正極板11の主面の大きさは、長さ205mmとし、幅110mmとした。負極板13の主面の大きさは、長さ209mmとし、幅114mmとした。セパレータの大きさは、長さ213mmとし、幅118mmとした。外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を240mmとし、外寸のy方向の長さ(図4のy4)を136mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を215mmとし、y方向の長さ(図4のy3)を126mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を209mmとし、y方向の長さ(図4のy2)を118mmとした。電極端子14、15を含めた二次電池1のx方向の長さは264mmとし、y方向の長さ(幅)は136mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
比較例6に係る二次電池1では、正極板11の主面の大きさは、長さ205mmとし、幅110mmとした。負極板13の主面の大きさは、長さ209mmとし、幅114mmとした。セパレータの大きさは、長さ213mmとし、幅118mmとした。外装部材16の大きさは、外寸のx方向の長さ(図4のx4)を254mmとし、外寸のy方向の長さ(図4のy4)を128mmとし、z方向の高さを4mmとした。また、発電要素18を封止する二次電池1の内部空間の大きさは、x方向長さ(図4のx3)を229mmとし、y方向の長さ(図4のy3)を118mmとした。外装部材16の上面部分の大きさは、x方向長さ(図4のx2)を217mmとし、y方向の長さ(図4のy2)を112mmとした。電極端子14、15を含めた二次電池1のx方向の長さは278mmとし、y方向の長さ(幅)は128mmとし、z方向の長さ(厚さ)は8mmとした。それ以外の大きさは実施例1と同じである。
11…正極板
12…負極板
13…セパレータ
16、17…外装部材
161、171…当接部
162、164、172、174…延在部
163、175…封止部
Claims (6)
- 板状の複数の電極を、セパレータを介して積層した積層型発電要素と、
前記積層型発電要素及び電解液を封止しつつ、前記複数の電極の積層方向からみて長辺及び短辺の矩形の形状に形成された一対の外装部材とを備え、
前記一対の外装部材のうち少なくとも一方の外装部材は、
前記複数の電極のうち最上層に位置する最上層電極と当接する当接面を含む当接部と、
前記外装部材の外周の位置に前記外装部材同士で重なる封止部と、
前記当接部から前記封止部に延在する延在部とを有し、
1≦LA/LB≦2 を満たす
ことを特徴とする扁平型二次電池。
ただし、前記長辺と平行で、かつ、前記積層方向に沿った面により前記扁平型二次電池を切った第1断面において、LAは、前記長辺に対して平行な方向で両端に位置する一対の前記延在部の長さの平均であり、
前記短辺と平行で、かつ、前記積層方向に沿った面により前記扁平型二次電池を切った第2断面において、LBは、前記短辺に対して平行な方向で両端に位置する一対の前記延在部の長さの平均である。 - 請求項1記載の扁平型二次電池において、
LA/d≧LB/dを満たし、かつ、
4≦b≦10の範囲内で、bに対するLA/dの値及びbに対するLB/dの値が、第1直線と第2直線との間にある
ことを特徴とする扁平型二次電池。
ただし、
dは前記複数の電極のうち複数の前記封止部の間に位置する前記電極から前記最上層電極までの前記積層型発電要素の厚さであり、
bは前記複数の電極のうち複数の前記封止部の間に位置する電極から前記封止部までの長さであり、
前記第1直線は、bに対するLA/dの最小値の特性、又は、bに対するLB/dの最小値の特性を示し、
前記第2直線は、bに対するLA/dの最大値の特性、又は、bに対するLB/dの最大値の特性を示す。 - 請求項1又は2記載の扁平型二次電池において、
前記封止部は、前記当接面と平行な平行面を含む平面部を有し、
1≦aA/aB≦7 を満たす
ことを特徴とする扁平型二次電池。
ただし、前記第1断面において、aAは前記長辺に対して平行な方向で両端に位置する一対の前記平面部の長さの平均であり、
前記第2断面において、aBは前記短辺に対して平行な方向で両端に位置する一対の前記平面部の長さの平均である。 - 請求項1~3のいずれか一項に記載の扁平型二次電池において、
前記封止部は、前記当接面と平行な平行面を含む平面部を有し、
aA/d≧aB/dを満たし、かつ
4≦b≦10の範囲内で、bに対するaA/dの値及びbに対するaB/dの値が、第3直線と第4直線との間にある
ことを特徴とする扁平型二次電池。
ただし、
dは前記複数の電極のうち複数の前記封止部の間に位置する前記電極から前記最上層電極までの前記積層型発電要素の厚さであり、
bは前記複数の電極のうち複数の前記封止部の間に位置する電極から前記封止部までの長さであり、
前記第3直線は、bに対するaA/dの最小値の特性、又は、bに対するaB/dの最小値の特性を示し、
前記第4直線は、bに対するaA/dの最大値の特性又はbに対するaB/dの最大値の特性を示す。 - 請求項1~4のいずれか一項に記載の扁平型二次電池において、
前記扁平型二次電池は、定格容量に対する電池面積(電池外装体まで含めた電池の投影面積)の比の値が5cm2/Ah以上であり、かつ、定格容量が3Ah以上である
ことを特徴とする扁平型二次電池。 - 請求項1~4のいずれか一項に記載の扁平型二次電池において、
前記電極の積層面の縦横比として定義される前記電極のアスペクト比が1~3である
ことを特徴とする扁平型二次電池。
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CN106165144B (zh) | 2018-10-23 |
JPWO2015156167A1 (ja) | 2017-04-13 |
EP3131135A1 (en) | 2017-02-15 |
KR20160130827A (ko) | 2016-11-14 |
US20170025710A1 (en) | 2017-01-26 |
JP6281635B2 (ja) | 2018-02-21 |
EP3131135B1 (en) | 2018-10-31 |
US10431852B2 (en) | 2019-10-01 |
EP3131135A4 (en) | 2017-02-15 |
KR101917488B1 (ko) | 2018-11-09 |
CN106165144A (zh) | 2016-11-23 |
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