Cell stack arrangement and battery module
Patent Information
- Application Number
- DE102024124580
- Authority / Receiving Office
- DE · DE
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-10-10
- Filing Date
- 2024-08-28
- Publication Date
- 2025-04-10
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
BACKGROUNDTechnical FieldThe present invention relates to a cell stack assembly and a battery module.Prior ArtHitherto, a battery cell has been studied in which a plurality of electrode assemblies each consisting of a cathode, an anode and a separator are stacked and bundled with a tape.For example, Japanese Patent Application Publication No. 2016-15 212 describes a secondary battery including a stack of alternately stacked cathodes and anodes with separators interposed therebetween and including a tape for fixing the stack. The tape includes a pair of flat surface adhesion portions provided at two end portions and respectively adhered to the two outermost layers of the stack assembly, and an intermediate portion positioned between the pair of flat surface adhesion portions and adhered to a lateral end edge of each layer of the stack assembly. The flat surface adhesion portions have a conical shape with an acute angle at the front end thereof.Heretofore, the fixing has been performed by winding fixing tape on electrode assemblies constituting a battery and on a laminated outer package covering the electrode assemblies. Examples of the fixing tape include an inner fixing tape wound on an outer circumferential surface of the electrode assemblies on the inner side of the laminated outer package and an outer fixing tape wound on an outer circumferential surface of the laminated outer package. However, when the fixing tape is wound, it leads to an increase in thickness around the thickness of the fixing tape, and accordingly there is room for improvement in volumetric efficiency.The present invention provides a cell stack assembly with higher volumetric efficiency and a battery module with such a cell stack assembly.A cell stack assembly of a first aspect of the present invention is a cell stack assembly having a plurality of stacked battery cells. Each of the battery cells includes an electrode assembly, a laminated outer package covering the electrode assembly and enclosing the electrode assembly inside, and a fixing tape including at least one of an inner fixing tape wound in a circumferential direction on an outer circumferential surface of the electrode assembly on an inner side of the laminated outer package or an outer fixing tape wound in a circumferential direction on an outer circumferential surface of the laminated outer package. When considering the direction in which the plurality of battery cells are stacked as a stacking direction, the fixing tape is wound so that the winding positions of the fixing tape do not overlap in the stacking direction for at least one adjacent pair of the battery cells.A cell stack assembly of a second aspect of the present invention is the cell stack assembly of the first aspect, wherein the fixing belt includes only the inner fixing belt, and the inner fixing belt is wound so that the winding positions of the inner fixing belt do not overlap in the stacking direction for at least an adjacent pair of the battery cells.A cell stack assembly of a third aspect of the present invention is the cell stack assembly of the first aspect, wherein the fixing belt includes only the outer fixing belt, and the outer fixing belt is wound so that the winding positions of the outer fixing belt do not overlap in the stacking direction for at least an adjacent pair of the battery cells.A cell stack assembly of a fourth aspect of the present invention is the cell stack assembly of the first aspect, wherein the fixing belt includes the inner fixing belt and the outer fixing belt, and the inner fixing belt and the outer fixing belt are wound such that the winding positions of the inner fixing belt and the winding positions of the outer fixing belt do not overlap in the stacking direction for at least an adjacent pair of the battery cells.A cell stack assembly of a fifth aspect of the present invention is the cell stack assembly of the fourth aspect, wherein the fixing tape is wound so that the winding positions of the inner fixing tape and the winding positions of the outer fixing tape do not overlap in a single battery cell of the battery cells.A cell stack assembly of a sixth aspect of the present invention is the cell stack assembly according to any one of the first aspect to the fifth aspect, wherein the fixing tape is wound so that the winding positions of the fixing tape overlap in the stacking direction for none of the battery cells adjacent to each other.A cell stack assembly of a seventh aspect of the present invention is the cell stack assembly according to any one of the first aspect to the sixth aspect, wherein the fixing tape is wound such that the winding positions of the fixing tape do not overlap in the stacking direction for any of the battery cells.A battery module of an eighth aspect of the present invention includes a cell stack assembly according to any one of the first aspect to the seventh aspect.The present invention is capable of providing a cell stack assembly having increased volumetric efficiency and a battery module having such a cell stack assembly.BRIEF DESCRIPTION OF THE DRAWINGSExemplary embodiments of the present invention will be described in detail based on the following drawings, in which: FIG. 1 is a schematic perspective view illustrating a single electrode assembly and an inner fixing band of a cell stack assembly according to a first embodiment; FIG. 2 is a schematic side view illustrating a battery cell in which the single electrode assembly and the inner fixing band shown in FIG. 1 are further enclosed by a laminated outer package; FIG. 3 is a schematic side view illustrating the cell stack assembly according to a first embodiment; FIG. 4 is a schematic side view illustrating a battery cell in which a single electrode assembly and a laminated outer package have been fixed by an outer fixing tape in a cell stack assembly according to a second embodiment; FIG. 5 is a schematic side view illustrating a cell stack assembly according to the second embodiment; FIG. 6 is a schematic side view illustrating a cell stack assembly according to a third embodiment; FIG. 7 is a schematic side view illustrating a cell stack assembly according to a modified example; FIG. 8 is a schematic plan view illustrating relevant parts of a vehicle; FIG. 9 is a schematic perspective view of a battery module; FIG. 10 is a plan view showing a state in which a lid of a battery module has been removed; and FIG. 11 is a schematic illustration of a battery cell accommodated in a battery module, viewed along a thickness direction.DETAILED DESCRIPTIONThe following is a description of exemplary embodiments that are examples of the present invention. This description and examples are merely for the purpose of illustrating examples of the exemplary embodiments, and do not limit the scope of the invention.In the stepwise numerical ranges referred to in the present specification, the upper value or the lower value of a given numerical range may be replaced with the upper value or the lower value of another one of the stepwise numerical ranges. Moreover, in the numerical ranges referred to in the present specification, the upper value or the lower value of these numerical ranges may be replaced with a value given in an example.A cell stack assembly according to an exemplary embodiment of the present invention is a cell stack assembly configured of a plurality of stacked battery cells. These battery cells each include an electrode assembly, a laminated outer package covering the electrode assembly and enclosing the electrode assembly inside, and a fixing tape including at least one of an inner fixing tape wound circumferentially around an outer circumferential surface of the electrode assembly on the inner side of the laminated outer package and an outer fixing tape wound circumferentially around an outer circumferential surface of the laminated outer package.When considering a direction in which the plurality of battery cells are stacked as a stacking direction, the winding positions of the fixing tapes in the stacking direction do not overlap for at least a pair of battery cells that are adjacent to each other and wound with the fixing tape.For example, in cases where the battery cells include only one inner fixing tape as the fixing tape, the inner fixing tape is wound so that positions at which the inner fixing tape is wound do not overlap in the stacking direction for at least a pair of battery cells that are adjacent to each other.Moreover, in cases where the battery cells include only outer fixing tapes as fixing tapes, the outer fixing tape is wound so that the positions at which the outer fixing tape is wound do not overlap in the stacking direction for at least a pair of adjacent battery cells.Moreover, in cases where the battery cells include both inner fixing tapes and outer fixing tapes as fixing tapes, the inner fixing tapes and the outer fixing tapes are wound so that all winding positions of the outer fixing tapes and all winding positions of the inner fixing tapes do not overlap in the stacking direction for at least a pair of adjacent battery cells.Heretofore, in batteries, cell stack assemblies were used, each cell comprising an electrode assembly and a laminated outer package covering the electrode assembly, and the electrode assemblies and the laminated outer packages were stacked. The electrode assemblies in the cell stack assembly are fixed with fixing tape.Examples of fixing tapes include, for example, an inner fixing tape wound circumferentially around an outer circumferential surface of the electrode assembly on the inner side laminated outer package, and an outer fixing tape wound circumferentially around an outer circumferential surface of the laminated outer package.However, when winding with fixing tape, the total thickness of the cell stack assembly also increases due to the increase in the thickness of the fixing tape, and there is room for improvement in volumetric efficiency.To solve this problem, in a cell stack assembly according to an exemplary embodiment of the present invention, the fixing tape is wound so that the winding positions of the fixing tapes do not overlap in the stacking direction for at least a pair of adjacent battery cells. If the winding positions of the fixing tapes in adjacent battery cells were to overlap, the thickness would increase by two fixing tapes. In contrast, in the cell stack assembly according to an exemplary embodiment of the present invention, the winding positions of the fixing tapes do not overlap with adjacent battery cells, and the increased proportion of the total thickness of the cell stack assembly due to the fixing tapes can be suppressed. Thereby, the thickness of the cell stack assembly can be reduced by suppressing the overlap of the fixing bands, whereby the volumetric efficiency can be increased and a higher energy density can be obtained.Note that, in the cell stack assembly according to an exemplary embodiment of the present invention, the fixing tapes may be wound so that the winding positions of the fixing tapes in the stacking direction do not overlap for at least one pair of battery cells that are adjacent to each other as stated above. However, the fixing tapes are preferably wound such that the winding positions of the fixing tapes do not overlap in the stacking direction for any of the adjacent battery cells. More preferably, the fixing tapes are wound such that the winding positions of the fixing tapes do not overlap in the stacking direction for any of the battery cells.The following is a description of an embodiment (a first embodiment) of a cell stack assembly according to an exemplary embodiment of the present invention with reference to the drawings.Each of the drawings mentioned below is only schematically illustrated, and the sizes and shapes of the individual portions are illustrated and exaggerated as appropriate for better understanding.FIG. 1 is a schematic perspective view of a cell stack assembly according to the first embodiment, and shows a single electrode assembly and an inner fixing belt. FIG. 2 is a schematic side view of the single electrode assembly and the inner fixing tape illustrated in FIG. 1, and illustrates the battery cell further enclosed by a laminated outer package in a side view viewed from a side surface direction of the electrode assembly (the direction X in FIG. 1 ).The electrode assembly 4 illustrated in FIGS. 1 and 2 is formed in a substantially rectangular plate shape. Although not illustrated in the drawings, the electrode assembly 4 includes a cathode, an anode, and a separator disposed between the cathode and the anode. Note that the electrode assembly 4 may include a structure in which a plurality of laminated structures each including a cathode, an anode, and a separator are further stacked in an arrow direction Y (stacking direction).The electrode assembly 4 includes corresponding terminals (tabs) 26 on side surfaces in the longitudinal direction (arrow direction Z). In the present embodiment, the terminals 26 are provided, for example, at positions offset to one side from a short-direction center (arrow direction X) of a battery cell 20.There are 5 inner fixing tapes 41 to 45 which are attached so as to be wound one full revolution each around the outer circumferential surface of the electrode assembly 4. Each of the inner fixing tapes 41 to 45 is wound one full revolution on the four surfaces of the electrode assembly 4 on which the terminals 26 are not provided. In cases where the electrode assembly 4 has a structure in which a plurality of laminated structures each including a cathode, an anode, and a separator are further stacked in the stacking direction (arrow direction Y), the plurality of laminated structures are bundled by winding the inner fixing tapes 41 to 45 around the outer periphery thereof.The electrode assembly 4 fixed by the five inner fixing tapes 41 to 45 is then covered, as shown in FIG. 2, by a laminating film 28 serving as an example of a laminated outer package and enclosed in the interior thereof. Note that FIG. 2 is a side view illustrating the inside of the laminating film 28.Note that FIGS. 1 and 2 illustrate an embodiment in which the electrode assembly 4 is fixed by the five inner fixing tapes 41 to 45, but there is no limitation thereto, and the number of inner fixing tapes wound around a single electrode assembly 4 should be one or more.In the cell stack assembly according to the first embodiment, a plurality of the battery cells illustrated in FIGS. 1 and 2 are further stacked as illustrated in FIG. 3. FIG. 3 is a schematic side view illustrating a cell stack assembly according to the first embodiment, and is a side view viewed from a side surface direction (X direction in FIG. 1 ) of the electrode assembly. Note that FIG. 3 is a side view illustrating the internal spaces of the laminate films.As illustrated in FIG. 3, a cell stack assembly 200 includes a stacked structure of three battery cells 20A, 20B, 20C. The winding positions of the fixing tapes do not overlap in the stacking direction for all the battery cells that are adjacent to each other, namely, the adjacent battery cell 20A and the battery cell 20B, and the adjacent battery cell 20B and the battery cell 20C. Specifically, the winding positions of the inner fixing tapes 41A, 42A, 43A, 44A, 45A of the adjacent battery cell 20A do not overlap in the stacking direction with the inner fixing tapes 41B, 42B, 43B, 44B, 45B of the adjacent battery cell 20B adjacent to the adjacent battery cell 20A. In addition, the winding positions of the inner fixing tapes 41B, 42B, 43B, 44B, 45B of the adjacent battery cell 20B do not overlap in the stacking direction with the inner fixing tapes 41C, 42C, 43C, 44C, 45C of the adjacent battery cell 20C adjacent to the adjacent battery cell 20B.Moreover, the respective winding positions of the fixing tapes in the stacking direction do not overlap for any of the battery cells, namely, between the battery cell 20A, the battery cell 20B, and the battery cell 20C. Specifically, the winding positions of all the inner fixing tapes 41A, 42A, 43A, 44A, 45A of the adjacent battery cell 20A, the inner fixing tapes 41B, 42B, 43B, 44B, 45B of the battery cell 20B, the inner fixing tapes 41C, 42C, 43C, 44C, 45C of the battery cell 20C do not overlap in the stacking direction.This means that in the cell stack arrangement 200 illustrated in FIG. 3, the increased proportion of the total thickness of the cell stack arrangement due to the fixing belt can be suppressed. This thereby enables a reduction in the thickness of the cell stack assembly, enables an improvement in the volumetric efficiency, and enables a higher energy density to be achieved.Next, a description will be given of another embodiment (a second embodiment) of the cell stack assembly according to an exemplary embodiment of the present invention with reference to the drawings.FIG. 4 is a schematic side view of a cell stack assembly according to a second embodiment illustrating a battery cell in which a single electrode assembly and a laminated outer package have been fixed by outer fixing tapes.The electrode assembly 4 shown in FIG. 4 has corresponding terminals (tabs) 26 on the side surfaces in the longitudinal direction. The electrode assembly 4 is then covered by the laminating film 28 serving as an example of a laminated outer package and enclosed in the interior thereof. Note that FIG. 4 is a side view illustrating the inside of the laminating film 28.Five outer fixing tapes 61 to 65 are attached to the electrode assembly 4 enclosed in the laminating film 28 so as to be wound one full turn each on the outer circumferential surface of the laminating film 28. Each of the outer fixing tapes 61 to 65 is completely wound around the four sides of the laminating film 28 where no terminals 26 are located.Note that, although an embodiment in which the laminating film 28 has been fixed by the five outer fixing tapes 61 to 65 is illustrated in FIG. 4, there is no limitation thereto, and the number of outer fixing tapes wound on the laminating film 28 should be one or more.In the cell stack assembly according to the second embodiment, a plurality of the battery cells illustrated in FIG. 4 are stacked as illustrated in FIG. 5. FIG. 5 is a schematic side view illustrating a cell stack assembly according to the second embodiment in a side view from a side surface direction of the electrode assembly. Note that FIG. 5 is a side view illustrating the internal spaces of the laminating films.As shown in FIG. 5, a cell stack assembly 220 includes a stacked structure of three battery cells 22A, 22B, 22C. The winding positions of the fixing tapes do not overlap in the stacking direction for all the battery cells that are adjacent to each other, namely, between the adjacent battery cell 22A and the battery cell 22B and between the adjacent battery cell 22B and the battery cell 22C. Specifically, the winding positions of the outer fixing tapes 61A, 62A, 63A, 64A, 65A of the battery cell 22A in the stacking direction do not overlap with the outer fixing tapes 61B, 62B, 63B, 64B, 65B of the battery cell 22B adjacent to the battery cell 22A. In addition, the winding positions of the outer fixing tapes 61B, 62B, 63B, 64B, 65B of the battery cell 22B in the stacking direction do not overlap with the outer fixing tapes 61C, 62C, 63C, 64C, 65C of the battery cell 22C adjacent to the battery cell 22B.Moreover, the winding positions of the fixing tapes in the stacking direction do not overlap for any of the battery cells, namely, between the battery cell 22A, the battery cell 22B, and the battery cell 22C. Specifically, the winding positions of the outer fixing tapes 61A, 62A, 63A, 64A, 65A of the battery cell 22A, the outer fixing tapes 61B, 62B, 63B, 64B, 65B of the battery cell 22B, and the outer fixing tapes 61C, 62C, 63C, 64C, 65C of the battery cell 22C do not overlap in the stacking direction.This means that in the cell stack arrangement 220 illustrated in FIG. 5, the increased proportion of the total thickness of the cell stack arrangement can be suppressed on account of the fixing bands. This can reduce the overall thickness of the cell stack assembly, which increases volumetric efficiency and enables higher energy density to be achieved.Next, a description will be given of another embodiment (a third embodiment) of a cell stack assembly according to an exemplary embodiment of the present invention with reference to the drawings.FIG. 6 is a schematic side view illustrating a cell stack assembly according to the third embodiment in a side view from a side surface direction of an electrode assembly. Note that FIG. 6 is a side view illustrating the internal spaces of the laminating films.The following is a first description of a single battery cell 24D in a cell stack assembly 240 shown in FIG. 6. The electrode assembly 4 in the single battery cell 24D includes corresponding terminals (tabs) 26 on the side surfaces in the longitudinal direction thereof. Three inner fixing tapes 41D to 43D are attached so as to be wound one full revolution each around the outer circumferential surface of the electrode assembly 4. Each of the inner fixing tapes 41D to 43D is wound one full revolution around the four surfaces of the electrode assembly 4 where the terminals 26 are not provided.The electrode assembly 4 fixed by the three inner fixing tapes 41D to 43D is then covered with a laminating film 28 serving as an example of a laminated outer package and enclosed in the interior thereof. In addition, three outer fixing tapes 61D to 63D are attached to the electrode assembly 4 enclosed in the laminating film 28 so as to be wound one full revolution around the outer circumferential surface of the laminating film 28. Each of the outer fixing tapes 61D to 63D is wound one full revolution around the four surfaces of the laminating film 28 where the terminals 26 are not present.Namely, the battery cell 24D is fixed by the inner fixing tapes 41D to 43D directly wound on the outer circumferential surface of the electrode assembly 4 and by the outer fixing tapes 61D to 63D wound on the outer circumferential surface of the laminating film 28.Note that the battery cells 24D, 24E, 24F illustrated in FIG. 6 are each illustrated for an embodiment fixed by three inner fixing tapes and three outer fixing tapes, but there is no limitation thereto. The number of the inner fixing tapes wound around a single electrode assembly 4 may be one or more, and also the number of the outer fixing tapes wound around the laminating film 28 should be one or more.The cell stack assembly 240 according to the third embodiment includes a stacked structure of three battery cells 24D, 24E, 24F. The winding positions of the fixing tapes do not overlap in the stacking direction for any of the adjacent battery cells, namely, between the adjacent battery cell 24D and the battery cell 24E and between the adjacent battery cell 24E and the battery cell 24F. Specifically, the winding positions of the inner fixing tapes 41D, 42D, 43D and the outer fixing tapes 61D, 62D, 63D of the battery cell 24D in the stacking direction do not overlap with the winding positions of the inner fixing tapes 41E, 42E, 43E and the outer fixing tapes 61E, 62E, 63E of the battery cell 24E adjacent to the battery cell 24D. In addition, the winding positions of the inner fixing tapes 41E, 42E, 43E and the outer fixing tapes 61E, 62E, 63E of the battery cell 24E in the stacking direction do not overlap with the winding positions of the inner fixing tapes 41F, 42F, 43F and the outer fixing tapes 61F, 62F, 63F of the battery cell 24F adjacent to the battery cell 24E.Moreover, the winding positions of the fixing tapes in the stacking direction do not overlap for any of the battery cells, namely, between the adjacent battery cell 24D, the battery cell 24E, and the battery cell 24F. Specifically, the winding positions in the stacking direction do not overlap for the inner fixing tapes 41D, 42D, 43D and the outer fixing tapes 61D, 62D, 63D of the battery cell 24D, the inner fixing tapes 41E, 42E, 43E and the outer fixing tapes 61E, 62E, 63E of the battery cell 24E, and the inner fixing tapes 41F, 42F, 43F and the outer fixing tapes 61F, 62F, 63F of the battery cell 24F.This means that in the cell stack arrangement 240 illustrated in FIG. 6, the proportion of the total thickness of the cell stack arrangement which is increased by the fixing belt can be suppressed. This can reduce the thickness of the cell stack assembly, which increases volumetric efficiency and enables higher energy density to be achieved.Note that, in the cell stack assembly 240 for the single battery cell 24D illustrated in FIG. 6, the winding positions of the inner fixing tapes 41D, 42D, 43D do not overlap with the winding positions of the outer fixing tapes 61D, 62D, 63D. Also, in the single battery cell 24E, the winding positions of the inner fixing tapes 41E, 42E, 43E do not overlap with the winding positions of the outer fixing tapes 61E, 62E, 63E, and also in the single battery cell 24F, the winding positions of the inner fixing tapes 41F, 42F, 43F do not overlap with the winding positions of the outer fixing tapes 61F, 62F, 63F.This means that in the cell stack assembly 240 illustrated in FIG. 6, the increased proportion of the total thickness of the cell stack assembly due to the winding positions of the inner fixing bands and the outer fixing bands of a single battery cell can be suppressed. This can reduce the thickness of the cell stack assembly, which increases volumetric efficiency and enables higher energy density to be achieved.Although the cell stack assembly of the first embodiment illustrated in FIG. 3, the cell stack assembly of the second embodiment illustrated in FIG. 5, and the cell stack assembly of the third embodiment illustrated in FIG. 6 all illustrate embodiments in which the winding positions of the fixing belts do not overlap for any of the battery cells in the stacking direction, there is no limitation thereto. For example, a configuration may be adopted in which the winding positions of the fixing tapes in the stacking direction for none of the adjacent battery cells overlap and the winding positions of the fixing tapes in the stacking direction for some of the non-adjacent battery cells overlap.For example, a cell stack assembly 222 illustrated in FIG. 7 includes a stack structure of three battery cells 22L, 22M, 22N. The winding positions of the fixing tapes do not overlap in the stacking direction for any of the adjacent battery cells, namely, between the adjacent battery cell 22L and the battery cell 22M and between the adjacent battery cell 22M and the battery cell 22N. Specifically, the winding positions of the outer fixing tapes 61L, 62L, 63L, 64L, 65L of the battery cell 22L in the stacking direction do not overlap with the outer fixing tapes 61M, 62M, 63M, 64M, 65M of the battery cell 22M adjacent to the battery cell 22L. In addition, the winding positions of the outer fixing tapes 61M, 62M, 63M, 64M, 65M of the battery cell 22M in the stacking direction do not overlap with the outer fixing tapes 61N, 62N, 63N, 64N, 65N of the battery cell 22N adjacent to the battery cell 22M. However, the winding positions of the outer fixing tapes 61L, 62L, 63L, 64L, 65L of the battery cell 22L overlap with the winding positions of the outer fixing tapes 61N, 62N, 63N, 64N, 65N of the battery cell 22N that is not adjacent to the battery cell 22L in the stacking direction,As illustrated in FIG. 7, by adopting a configuration in which the winding positions of the fixing tapes do not overlap in the stacking direction for all the battery cells adjacent to each other, the increased proportion of the total thickness of the cell stack assembly due to the fixing tapes can be suppressed. This can reduce the thickness of the cell stack assembly, increase volumetric efficiency, and achieve higher energy density.Moreover, the cell stack assembly of the first embodiment illustrated in FIG. 3, the cell stack assembly of the second embodiment illustrated in FIG. 5, and the cell stack assembly of the third embodiment illustrated in FIG. 6 are examples of stacked cell stack assemblies configured of three battery cells, but are not limited thereto. For example, the number of battery cells stacked in a cell stack arrangement should be two or more, and there may be ten or more stacked battery cells, and there may also be twenty or more stacked battery cells.Also in each of these cases, the fixing tapes are wound so that the winding positions of the fixing tapes do not overlap in the stacking direction for at least a pair of adjacent battery cells. Note that the fixing tapes are preferably wound so that the winding positions of the fixing tapes do not overlap in the stacking direction for all the adjacent battery cells. More preferably, the fixing tapes are wound such that the winding positions of the fixing tapes do not overlap in the stacking direction for any of the battery cells.Next, a description will be given of a battery module, a battery pack, and a vehicle having a cell stack assembly according to an exemplary embodiment of the present invention.FIG. 8 is a schematic plan view illustrating relevant parts of a vehicle 100 equipped with a battery pack 10 according to an exemplary embodiment. As illustrated in FIG. 8, the vehicle 100 is a battery electric vehicle (BEV) having the battery pack 10 installed under the floor thereof. Note that the arrow UP, the arrow FR, and the arrow LH in each of the drawings respectively point upward in the vehicle height direction, forward in the vehicle front-rear direction, and leftward in the vehicle width direction. Unless specifically stated otherwise, the front and rear, left and right and up and down directions used in the following explanation refer to front and rear in the vehicle front-rear direction, left and right in the vehicle width direction, and up and down in the vehicle height direction, respectively.As an example of the vehicle 100 of the present exemplary embodiment, a DC / DC converter 102, an electric compressor 104, and a PTC heater 106 are disposed further toward the vehicle front side than the battery pack 10.The DC output of the battery pack 10 is voltage-regulated by the DC-DC converter 102 and then supplied to the electric compressor 104, the PTC heater 106, the inverter 112, and the like. The rear wheels are rotated by current supplied to the motor 108 via the inverter 112 to drive the vehicle 100.A charging port 116 is provided at a right side portion of a rear portion of the vehicle 100, and current from the charging port 116 can accumulate in the battery pack 10 through the charger 114 by being connected to a charging plug of an external charger, not illustrated.Note that the configuration, the configuration, and the like of each component configuring the vehicle 100 are not limited to the configuration described above. For example, the application may be to a hybrid vehicle (HV) or a plug-in hybrid electric vehicle (PHEV) with an internal combustion engine mounted thereon. In addition, although the present exemplary embodiment is intended for a rear wheel drive vehicle in which the motor 108 is installed in a rear portion of the vehicle, there is no limitation thereto, and the application may be applied to a front wheel drive vehicle in which the motor 108 is installed in a front portion of the vehicle, or a pair of the motors 108 may be installed at the front and rear sides of the vehicle. In addition, the application may be applied to a vehicle including an in-wheel motor for each wheel.The battery pack 10 is configured with a plurality of battery modules 11 in this case. As an example, in the present exemplary embodiment, ten battery modules 11 are provided. Specifically, five of the battery modules 11 are arranged along the right side of the vehicle 100 in the vehicle front-rear direction, and five of the battery modules 11 are arranged along the left side of the vehicle 100 in the vehicle front-rear direction. The respective battery modules 11 are electrically connected to each other.FIG. 9 is a schematic perspective view of the battery module 11. An outer shell of the battery module 11 is formed of an aluminum alloy. For example, an outer shell of the battery module 11 is formed by joining aluminum die casting to both edges of an extruded member made of an aluminum alloy using laser welding or the like.A pair of voltage terminals 12 and a connector 14 are respectively provided at each of both end portions of the battery module 11 in the vehicle width direction. A flexible printed circuit 22, which will be described later, is connected to the connectors 14. An unillustrated bus bar is welded to each of both end portions of the battery module 11 in the vehicle width direction.A length MW of the battery module 11 in the vehicle width direction is, for example, 350 mm to 600 mm, a length ML in the vehicle front-rear direction is, for example, 150 mm to 250 mm, and a height MH in the vehicle height direction is, for example, 80 mm to 110 mm.FIG. 10 is a plan view of a state in which a lid of the battery module 11 has been removed. As illustrated in FIG. 10, a plurality of battery cells 20 are accommodated in an arranged state inside the battery module 11. As an example of the present exemplary embodiment, 24 of the battery cells 20 are arranged along the vehicle front-rear direction and are adhered to each other.The flexible printed circuit 22 is disposed over the battery cells 20. The flexible printed circuit 22 is formed in a band shape and has a longitudinal direction along the vehicle width direction, and a thermistor 24 is provided at each of both end portions of the flexible printed circuit 22. The thermistors 24 do not adhere to the battery cells 20 and are configured to be pressed toward the battery cell 20 side by the lid of the battery module 11.Moreover, one or more pieces of an unillustrated shock absorbing material is / are accommodated inside the battery module 11. The shock absorbing material may be, for example, a thin sheet-shaped member capable of elastically deforming and having a thickness direction along the arrangement direction of the battery cells 20, the shock absorbing material being disposed between the adjacent battery cells 20. As an example of the present exemplary embodiment, respective parts of the shock absorbing material are disposed at both end portions in the longitudinal direction of the battery module 11 and at a central portion thereof in the longitudinal direction.FIG. 11 is a schematic diagram of the battery cell 20 accommodated in the battery module 11 as viewed along the thickness direction of the battery cell 20. The electrode assembly is configured by laminating a cathode, an anode, and a separator, which are sealed by a laminating film 28.As an example of the present exemplary embodiment, a case portion of the electrode assembly is formed by folding and adhering the laminating film 28 having an embossed sheet shape. It should be appreciated that while both a single shell single shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell single-shell.The upper ends at the both end portions in the longitudinal direction of the battery cell 20 are bent over an angular outer profile. In addition, the upper end portions of the battery cell 20 are also bent.Respective terminals (tabs) 26 are provided at the both end portions in the longitudinal direction of the battery cell 20. As an example of the present exemplary embodiment, the terminals 26 are provided at positions offset downward from a height direction center of the battery cell 20. The terminals 26 are connected to the respective unillustrated bus bar by laser welding or the like.A length CW 1 of the battery cell 20 in the vehicle width direction is, for example, 530 mm to 600 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 mm to 900 mm, or 1000 mm or more, a length CW 2 of a region where the electrode assembly is located is, for example, 500 mm to 520 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 mm to 900 mm, or 1000 mm or more, and a height CH of the battery cell 20 is, for example, 80 mm to 110 mm, or 110 mm to 140 mm. The thickness of the battery cell 20 is 5.0 mm to 7.0 mm, 7.0 mm to 9.0 mm, or 9.0 mm to 11.0 mm, and the height TH of the terminals 26 is 40 mm to 50 mm, 50 mm to 60 mm, or 60 mm to 70 mm.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2016-15 212 A
[0003]
Claims
A cell stack assembly (200, 220, 222, 240) comprising: a plurality of stacked battery cells (20A, 20B, 20C, 22A, 22B, 22C, 22L, 22M, 22N, 24D, 24E, 24F) each comprising: an electrode assembly (4); a laminated outer package (28) covering the electrode assembly (4) and enclosing the electrode assembly (4) inside; and a fixing tape comprising at least one of an inner fixing tape (41A, 41B, 41C, 41D, 41E, 41F, 42A, 42B, 42C, 42D, 42E, 42F, 43A, 43B, 43C, 43D, 43E, 43F, 44, 44A, 44B, 44C, 45, 45A, 45B, 45c) wound in a circumferential direction on an outer circumferential surface of the electrode assembly (4) at an inner side of the laminated outer package (28), or an outer fixing tape (61, 61A, 61B, 61C, 61D, 61E, 61F, 61L, 61M, 61N, 62, 62A, 62B, 62C, 62D, 62E, 62F, 62L, 62M, 62N, 63, 63A, 63B, 63C, 63D, 63E, 63F, 63L, 63M, 63N, 64, 64A, 64B, 64C, 64L, 64M, 64N, 65, 65A, 65B, 65C, 65L, 65M, 65N) wound in the circumferential direction on an outer circumferential surface of the laminated outer package (28), wherein: when a direction is zero, in which the plurality of battery cells (20A, 20B, 20C, 22A, 22B, 22C, 22L, 22M, 22N, 24D, 24E, 24F) are stacked as the stacking direction, the fixing tape is wound so that the winding positions of the fixing tape do not overlap in the stacking direction for at least an adjacent pair of the battery cells (20A, 20B, 20C, 22A, 22B, 22C, 22L, 22M, 22N, 24D, 24E, 24F).The cell stack assembly of claim 1, wherein: the fixing tape comprises only the inner fixing tape (41A, 41B, 41C, 41D, 41E, 41F, 42A, 42B, 42C, 42D, 42E, 42F, 43A, 43B, 43C, 43D, 43E, 43F, 44, 44A, 44B, 44C, 45, 45A, 45B, 45C); and the inner fixing tape (41A, 41B, 41C, 41D, 41E, 41F, 42A, 42B, 42C, 42D, 42E, 42F, 43A, 43B, 43C, 43D, 43E, 43F, 44, 44A, 44B, 44C, 45, 45A, 45B, 45C) is so wound, that the winding positions of the inner fixing belt (41A, 41B, 41C, 41D, 41E, 41F, 42A, 42B, 42C, 42D, 42E, 42F, 43A, 43B, 43C, 43D, 43E, 43F, 44A, 44B, 44C, 45A, 45B, 45C) in the stacking direction do not overlap for at least an adjacent pair of the battery cells (20A, 20B, 20C).The cell stack assembly of claim 1, wherein: the fixing belt comprises only the outer fixing belt (61A, 61B, 61C, 61D, 61E, 61F, 61L, 61M, 61N, 62A, 62B, 62C, 62D, 62E, 62F, 62L, 62M, 62N, 63A, 63B, 63C, 63D, 63E, 63F, 63L, 63M, 63N, 64A, 64B, 64C, 64L, 64M, 64N, 65A, 65B, 65C, 65L, 65M, 65N); and the outer fixing belt (61A, 61B, 61C, 61D, 61E, 61F, 61L, 61M, 61N, 62A, 62B, 62C, 62D, 62E, 62F, 62L, 62m, 62n, 63a, 63b, 63c, 63d, 63e, 63f, 63l, 63m, 63n, 64a, 64b, 64c, 64l, 64m, 64n, 65a, 65b, 65c, 65l, 65m, 65n) is wound so that the winding positions of the outer fixing tape (61A, 61B, 61C, 61D, 61E, 61F, 61L, 61M, 61N, 62A, 62B, 62C, 62D, 62E, 62F, 62L, 62M, 62N, 63A, 63B, 63C, 63D, 63E, 63F, 63L, 63M, 63N, 64A, 64B, 64C, 64L, 64M, 64N, 65A, 65B, 65C, 65L, 65 m, 65 n) do not overlap in the stacking direction for at least one adjacent pair of the battery cells ( 22A, 22B, 22C, 22L, 22M, 22N).The cell stack assembly of claim 1, wherein: the fixing belt comprises the inner fixing belt (41D, 41E, 41F, 42D, 42E, 42F, 43D, 43E, 43F) and the outer fixing belt (61D, 61E, 61F, 62D, 62E, 62F, 63D, 63E, 63F); and the inner fixing tape (41D, 41E, 41F, 42D, 42E, 42F, 43D, 43E, 43F) and the outer fixing tape (61D, 61E, 61F, 62D, 62E, 62F, 63D, 63E, 63F) are wound such that the winding positions of the inner fixing tape (41D, 41E, 41F, 42D, 42E, 42F, 43D, 43E, 43F) and the winding positions of the outer fixing tape (61D, 61E, 61F, 62D, 62E, 62F, 63D, 63E, 63F) do not overlap in the stacking direction for at least one adjacent pair of the battery cells (24D, 24E, 24F).The cell stack assembly according to claim 4, wherein the fixing tape is wound such that the winding positions of the inner fixing tape (41D, 41E, 41F, 42D, 42E, 42F, 43D, 43E, 43F) and the winding positions of the outer fixing tape (61D, 61E, 61F, 62D, 62E, 62F, 63D, 63E, 63F) do not overlap in a single battery cell of the battery cells (24D, 24E, 24F).The cell stack assembly according to claim 1, wherein the fixing tape is wound such that the winding positions of the fixing tape in the stacking direction do not overlap for any of the battery cells (20A, 20B, 20C, 22A, 22B, 22C, 22L, 22M, 22N, 24D, 24E, 24F) adjacent to each other.The cell stack assembly according to claim 6, wherein the fixing tape is wound such that the winding positions of the fixing tape in the stacking direction do not overlap for any of the battery cells (20A, 20B, 20C, 22A, 22B, 22C, 24D, 24E, 24F).A battery module (11) comprising a cell stack assembly (200, 220, 222, 240) according to any one of claims 1 to 7.