Monocell stack and battery module

Abstract

The present invention provides a single cell laminate in which a plurality of battery cells are laminated, each battery cell having: an electrode body; a laminated outer packaging body which covers the electrode body and encloses the electrode body in the interior of the laminated outer packaging body; and at least one of an inner side fixing band and an outer side fixing band, the inner side fixing band is wound around the outer peripheral surface of the electrode body in the circumferential direction on the inner side of the laminated outer packaging body, and the outer side fixing band is wound around the outer peripheral surface of the laminated outer packaging body in the circumferential direction. When a direction in which the plurality of battery cells are stacked is defined as a stacking direction, the fixing tape is wound such that winding positions of the fixing tape do not overlap in the stacking direction between at least one group of adjacent battery cells.

Description

Technical Field

[0001] The present disclosure relates to a single cell stack and a battery module. Background Art

[0002] In the past, a battery cell has been studied in which an electrode assembly including a plurality of positive electrodes, negative electrodes, and separators stacked together is bound by a tape.

[0003] For example, Japanese Patent Gazette No. 2016-15212 discloses a secondary battery, which includes a stack in which positive electrodes and negative electrodes are alternately stacked with a separator, and a tape for fixing the stack, wherein the tape has a pair of planar adhesive portions arranged at both ends and respectively adhered to the two outermost layers of the stack, and a middle portion located between the pair of planar adhesive portions and adhered to the side edge of each layer of the stack, and the planar adhesive portion has a gradually tapering shape with an acute angle at the front end.

[0004] In the past, the electrode bodies constituting the battery and the laminated outer packaging bodies covering the electrode bodies were fixed by winding a fixing tape. The fixing tape includes an inner fixing tape wound around the outer peripheral surface of the electrode body inside the laminated outer packaging body and an outer fixing tape wound around the outer peripheral surface of the laminated outer packaging body. However, in the case of winding the fixing tape, since the thickness is increased by an amount equivalent to that of the fixing tape, there is still room for improvement in improving the volume efficiency. Summary of the invention

[0005] The present disclosure provides a single cell stack having improved volumetric efficiency, and a battery module having the single cell stack.

[0006] The first type of single cell stack disclosed in the present invention is a single cell stack formed by stacking multiple battery cells, the battery cells comprising: an electrode body; a stacking outer packaging body, the stacking outer packaging body covering the electrode body and sealing the electrode body inside; and at least one of an inner fixing band and an outer fixing band, the inner fixing band being circumferentially wound around the outer peripheral surface of the electrode body on the inner side of the stacking outer packaging body, and the outer fixing band being circumferentially wound around the outer peripheral surface of the stacking outer packaging body, and when the direction in which the multiple battery cells are stacked is taken as the stacking direction, the fixing band is wound so that the winding positions of the fixing bands do not overlap in the stacking direction between at least one group of adjacent battery cells.

[0007] The second aspect of the single cell stack of the present disclosure is, in the first aspect of the single cell stack, characterized in that the fixing belt only includes the inner fixing belt, which is wound so that the winding positions of the inner fixing belts do not overlap in the stacking direction between at least one group of adjacent battery cells.

[0008] The third aspect of the single cell stack of the present disclosure is that in the first aspect of the single cell stack, the fixing belt only has the outer fixing belt, and the outer fixing belt is wound so that the winding positions of the outer fixing belts do not overlap in the stacking direction between at least one group of adjacent battery cells.

[0009] The fourth type of single cell stack disclosed in the present invention comprises, in the first type of single cell stack, an inner fixing band and an outer fixing band as the fixing band, and the inner fixing band and the outer fixing band are wound so that the winding position of the inner fixing band and the winding position of the outer fixing band do not overlap in the stacking direction between at least one group of adjacent battery cells.

[0010] A fifth aspect of the present disclosure provides the cell stack according to the fourth aspect, wherein the fixing tape is wound so that a winding position of the inner fixing tape and a winding position of the outer fixing tape do not overlap in one battery cell.

[0011] A sixth aspect of the present disclosure is the single cell stack according to any one of the first to fifth aspects, wherein the fixing tape is wound so that the winding positions of the fixing tape do not overlap in the stacking direction between all the adjacent battery cells.

[0012] A seventh aspect of the present disclosure is the single cell stack according to any one of the first to sixth aspects, wherein the fixing tape is wound so that the winding positions of the fixing tape do not overlap in the stacking direction between all the battery cells.

[0013] A battery module according to an eighth aspect of the present disclosure includes the single cell stack according to any one of the first to seventh aspects.

[0014] According to the present disclosure, a cell stack having improved volume efficiency and a battery module having the cell stack can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic perspective view showing one electrode body and an inner fixing band in a cell stack according to the first embodiment.

[0016] Figure 2 Yes means Figure 1 The figure shows a schematic side view of a battery cell in which an electrode body and an inner fixing band are further enclosed by a laminated outer casing.

[0017] Figure 3 This is a schematic side view showing a single cell stack according to the first embodiment.

[0018] Figure 4 This is a schematic side view showing a battery cell in which one electrode body and a stacked outer casing in a single-cell stack according to a second embodiment are fixed by an outer fixing tape.

[0019] Figure 5 It is a schematic side view showing a single cell stack according to the second embodiment.

[0020] Figure 6 It is a schematic side view showing a single cell stack according to the third embodiment.

[0021] Figure 7 It is a schematic side view showing a single cell stack according to a modified example.

[0022] Figure 8 It is a schematic plan view showing the main parts of a vehicle.

[0023] Fig. 9 This is a schematic three-dimensional diagram of a battery module.

[0024] Fig.10 This is a plan view of the battery module with the upper cover removed.

[0025] Fig.11 This is a schematic diagram of a battery cell housed in a battery module as viewed from the thickness direction. DETAILED DESCRIPTION

[0026] Hereinafter, an embodiment as an example of the present disclosure will be described. These descriptions and examples are for illustrating the embodiment and do not limit the scope of the invention.

[0027] In the numerical range recorded in stages in this manual, the upper limit or lower limit recorded in a numerical range can also be replaced by the upper limit or lower limit of the numerical range recorded in other stages. In addition, in the numerical range recorded in this manual, the upper limit or lower limit of its numerical range can also be replaced by the value shown in the embodiment.

[0028] The single cell stack according to the embodiment of the present disclosure is a single cell stack formed by stacking a plurality of battery cells. The battery cell comprises: an electrode body; a stacked outer package, the stacked outer package covering the electrode body and enclosing the electrode body inside; and at least one of an inner fixing band and an outer fixing band, the inner fixing band being wound around the outer peripheral surface of the electrode body along the circumferential direction on the inner side of the stacked outer package, and the outer fixing band being wound around the outer peripheral surface of the stacked outer package along the circumferential direction.

[0029] Furthermore, when the stacking direction is defined as the stacking direction, the fixing tape is wound between at least one set of adjacent battery cells so that the winding positions of the fixing tape do not overlap in the stacking direction.

[0030] For example, when the battery cells have only inner fixing bands as fixing bands, the inner fixing bands are wound between at least one set of adjacent battery cells so that the winding positions of the inner fixing bands do not overlap in the stacking direction.

[0031] Furthermore, when the battery cells have only the outer fixing bands as the fixing bands, the outer fixing bands are wound between at least one set of adjacent battery cells so that the wound positions of the outer fixing bands do not overlap in the stacking direction.

[0032] Furthermore, when the battery cell has an inner fixing band and an outer fixing band as fixing bands, the inner fixing band and the outer fixing band are wound between at least one set of adjacent battery cells, and the winding positions of the inner fixing band and the outer fixing band do not overlap in the stacking direction.

[0033] Conventionally, a battery uses a single cell stack, which includes an electrode body and a stacked outer package covering the electrode body, and the electrode body and the stacked outer package are stacked. The electrode body in the single cell stack is fixed by a fixing belt. Examples of the fixing belt include an inner fixing belt wound around the outer peripheral surface of the electrode body in the circumferential direction on the inner side of the stacked outer package, and an outer fixing belt wound around the outer peripheral surface of the stacked outer package in the circumferential direction.

[0034] However, when the fixing tape is wound, the thickness increases by an amount corresponding to the thickness of the fixing tape, and the thickness of the entire cell stack increases. Therefore, there is still room for improvement in terms of volume efficiency.

[0035] In contrast, in the single cell stack according to the embodiment of the present disclosure, the fixing tape is wound between at least one group of adjacent battery cells, and the winding position of the fixing tape does not overlap in the stacking direction. In the case where the winding positions of the fixing tapes between adjacent battery cells overlap, the thickness increases by an amount equivalent to two fixing tapes. However, in the single cell stack according to the embodiment of the present disclosure, the positions of the fixing tapes do not overlap in adjacent battery cells, and the increase in the thickness of the single cell stack as a whole caused by the fixing tape can be suppressed. In this way, by suppressing the overlap of the fixing tapes, the thickness of the single cell stack can be reduced, the volume efficiency can be improved, and the energy density can be improved.

[0036] In addition, in the single cell stack according to the embodiment of the present disclosure, as long as the fixing tape is wound between at least one group of adjacent battery cells, the winding position of the fixing tape does not overlap in the stacking direction as described above. However, preferably, the fixing tape is wound between all adjacent battery cells, and the winding position of the fixing tape does not overlap in the stacking direction. Furthermore, more preferably, the fixing tape is wound between all battery cells, and the winding position of the fixing tape does not overlap in the stacking direction.

[0037] Next, one mode (first mode) of a single cell stack according to an embodiment of the present disclosure will be described using the drawings.

[0038] Each of the drawings shown below is a schematic diagram, and the size and shape of each part are appropriately exaggerated for easy understanding.

[0039] Figure 1 This is a schematic perspective view showing one electrode body and an inner fixing band in a cell stack according to the first embodiment. Figure 2 Yes means Figure 1 The schematic side view of a battery cell in which an electrode body and an inner fixing band are further laminated and sealed with an outer packaging body is shown, viewed from the side direction of the electrode body ( Figure 1 Side view (in the X direction).

[0040] Figure 1 and Figure 2 The electrode body 4 shown is formed into a substantially rectangular plate shape. Although not shown in the figure, the electrode body 4 has a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. In addition, the electrode body 4 may also have a structure in which a stacked structure having a positive electrode, a negative electrode, and a separator is further stacked in multiple layers in the arrow Y direction (stacking direction).

[0041] The electrode body 4 has a terminal (electrode piece) 26 on each side surface in the longitudinal direction (arrow Z direction). In the present embodiment, as an example, the terminal 26 is provided at a position offset from the center in the short direction (arrow X direction) of the battery cell 20 .

[0042] Five inner fixing tapes 41 to 45 are attached to the outer peripheral surface of the electrode body 4 in a manner of being wound around one circle. The inner fixing tapes 41 to 45 are all wound around one circle with respect to the four surfaces of the electrode body 4 on which the terminals 26 are not provided. In the case where the electrode body 4 has a structure in which a stacked structure having a positive electrode, a negative electrode, and a separator is further stacked in multiple layers in the stacking direction (arrow Y direction), the stacked structure is restrained by winding the inner fixing tapes 41 to 45 around the outer periphery.

[0043] Furthermore, the electrode body 4 fixed by the five inner fixing bands 41 to 45 is as shown in FIG. Figure 2As shown, it is covered with a laminate film 28 as an example of a laminate outer package and sealed inside. Figure 2 It is a side view showing the inside of the laminated film 28 .

[0044] In addition, Figure 1 and Figure 2 In FIG. 1 , the electrode body 4 is fixed by five inner fixing tapes 41 to 45 , but the present invention is not limited thereto, and the number of inner fixing tapes wound around one electrode body 4 may be one or more.

[0045] According to the single cell stack of the first embodiment, further, Figure 1 and Figure 2 The battery cells shown in Figure 3 Multiple layers are shown stacked. Figure 3 is a schematic side view showing a single cell stack according to the first embodiment, viewed from the side of the electrode body ( Figure 1 In addition, Figure 3 It is a side view showing the inside of the laminated film.

[0046] like Figure 3 As shown, the single cell stack 200 has a structure in which three battery cells 20A, 20B, and 20C are stacked. Furthermore, between all adjacent battery cells, that is, between adjacent battery cells 20A and 20B, and between adjacent battery cells 20B and 20C, the winding positions of the fixing bands do not overlap in the stacking direction. Specifically, the winding positions of the inner fixing bands 41A, 42A, 43A, 44A, and 45A in the battery cell 20A and the inner fixing bands 41B, 42B, 43B, 44B, and 45B in the battery cell 20B adjacent to the battery cell 20A do not overlap in the stacking direction. The winding positions of the inner fixing bands 41B, 42B, 43B, 44B, and 45B in the battery cell 20B and the inner fixing bands 41C, 42C, 43C, 44C, and 45C in the battery cell 20C adjacent to the battery cell 20B do not overlap in the stacking direction.

[0047] Furthermore, among all the battery cells, that is, among the battery cells 20A, 20B, and 20C, the winding positions of the fixing bands do not overlap in the stacking direction. Specifically, the winding positions of the inner fixing bands 41A, 42A, 43A, 44A, and 45A in the battery cell 20A, the inner fixing bands 41B, 42B, 43B, 44B, and 45B in the battery cell 20B, and the inner fixing bands 41C, 42C, 43C, 44C, and 45C in the battery cell 20C do not overlap in the stacking direction.

[0048] Therefore, in Figure 3In the cell stack 200 shown, the increase in thickness of the cell stack as a whole due to the fixing tape can be suppressed. This can reduce the thickness of the cell stack, improve volume efficiency, and increase energy density.

[0049] Next, another embodiment (second embodiment) of the cell stack according to the embodiment of the present disclosure will be described using the drawings.

[0050] Figure 4 This is a schematic side view showing a battery cell in which one electrode body and a stacked outer casing are fixed by an outer fixing tape in a single cell stack according to a second embodiment.

[0051] Figure 4 The electrode body 4 shown has terminals (electrode pieces) 26 on each side in the longitudinal direction. The electrode body 4 is covered with a laminate film 28 as an example of a laminate outer package and sealed inside. Figure 4 It is a side view showing the inside of the laminated film 28 .

[0052] The electrode body 4 enclosed in the laminate film 28 is provided with five outer fixing tapes 61 to 65 wound around the outer peripheral surface of the laminate film 28. The outer fixing tapes 61 to 65 are wound around the four surfaces of the laminate film 28 where the terminals 26 are not present.

[0053] In addition, Figure 4 2 shows a mode in which the laminated film 28 is fixed by five outer fixing tapes 61 to 65 , but the present invention is not limited thereto, and the number of outer fixing tapes wound around the laminated film 28 may be one or more.

[0054] According to the second embodiment of the single cell stack, further, Figure 4 The battery cells shown are Figure 5 Multiple layers are shown stacked. Figure 5 1 is a schematic side view showing a single cell stack according to the second embodiment, and is a side view viewed from the side of the electrode body. Figure 5 It is a side view showing the inside of the laminated film.

[0055] like Figure 5As shown, the single battery stack 220 has a structure in which three battery cells 22A, 22B, and 22C are stacked. Furthermore, between all adjacent battery cells, that is, between adjacent battery cells 22A and 22B, and between adjacent battery cells 22B and 22C, the winding positions of the fixing bands do not overlap in the stacking direction. Specifically, the winding positions of the outer fixing bands 61A, 62A, 63A, 64A, and 65A in the battery cell 22A and the outer fixing bands 61B, 62B, 63B, 64B, and 65B in the battery cell 22B adjacent to the battery cell 22A do not overlap in the stacking direction. The outer fixing bands 61B, 62B, 63B, 64B, 65B in the battery cell 22B and the outer fixing bands 61C, 62C, 63C, 64C, 65C in the battery cell 22C adjacent to the battery cell 22B are not wound at positions overlapping in the stacking direction.

[0056] Furthermore, the winding positions of the fixing bands of all the battery cells, that is, the battery cells 22A, 22B, and 22C, do not overlap in the stacking direction. Specifically, the winding positions of the outer fixing bands 61A, 62A, 63A, 64A, and 65A of the battery cell 22A, the outer fixing bands 61B, 62B, 63B, 64B, and 65B of the battery cell 22B, and the outer fixing bands 61C, 62C, 63C, 64C, and 65C of the battery cell 22C do not overlap in the stacking direction.

[0057] Therefore, in Figure 5 In the cell stack 220 shown, the increase in thickness of the cell stack as a whole due to the fixing tape can be suppressed. This can reduce the thickness of the cell stack, improve volume efficiency, and increase energy density.

[0058] Next, another embodiment (third embodiment) of the cell stack according to the embodiment of the present disclosure will be described using the drawings.

[0059] Figure 6 1 is a schematic side view showing a single cell stack according to the third embodiment, and is a side view viewed from the side of the electrode body. Figure 6 It is a side view showing the inside of the laminated film.

[0060] First, for Figure 6The present invention will be described with reference to a battery cell 24D in the single cell stack 240 shown in FIG. The electrode body 4 in the battery cell 24D has a terminal (electrode piece) 26 on each side in the longitudinal direction. In addition, three inner fixing bands 41D to 43D are attached in a manner of being wound around the outer peripheral surface of the electrode body 4. The inner fixing bands 41D to 43D are all wound around the four surfaces of the electrode body 4 where the terminal 26 is not provided.

[0061] The electrode body 4 fixed by the three inner fixing tapes 41D to 43D is covered with a laminate film 28 as an example of a laminated outer package and sealed inside. Furthermore, the electrode body 4 sealed in the laminate film 28 is provided with three outer fixing tapes 61D to 63D attached to the outer peripheral surface of the laminate film 28 in a manner of being wound around one circle. The outer fixing tapes 61D to 63D are all wound around four surfaces of the laminate film 28 where the terminals 26 are not present.

[0062] That is, the battery cell 24D is fixed by the inner fixing tapes 41D to 43D directly wound around the outer peripheral surface of the electrode body 4 and the outer fixing tapes 61D to 63D wound around the outer peripheral surface of the laminate film 28 .

[0063] in addition, Figure 6 The battery cells 24D, 24E, and 24F shown in the figure are all fixed by three inner fixing bands and three outer fixing bands, but the present invention is not limited to this. The number of inner fixing bands wound around one electrode body 4 only needs to be one or more, and the number of outer fixing bands wound around the laminate film 28 only needs to be one or more.

[0064] The single cell stack 240 according to the third embodiment has a structure in which three battery cells 24D, 24E, and 24F are stacked. Furthermore, between all adjacent battery cells, that is, between adjacent battery cells 24D and battery cells 24E, and between adjacent battery cells 24E and battery cells 24F, the winding positions of the fixing bands do not overlap in the stacking direction. Specifically, the winding positions of the inner fixing bands 41D, 42D, 43D and the outer fixing bands 61D, 62D, and 63D in the battery cell 24D and the inner fixing bands 41E, 42E, 43E and the outer fixing bands 61E, 62E, and 63E in the battery cell 24E adjacent to the battery cell 24D do not overlap in the stacking direction. The winding positions of the inner fixing bands 41E, 42E, 43E and the outer fixing bands 61E, 62E, 63E in the battery cell 24E and the inner fixing bands 41F, 42F, 43F and the outer fixing bands 61F, 62F, 63F in the battery cell 24F adjacent to the battery cell 24E do not overlap in the stacking direction.

[0065] Furthermore, among all the battery cells, that is, among the battery cells 24D, 24E, and 24F, the winding positions of the fixing bands do not overlap in the stacking direction. Specifically, the winding positions of the inner fixing bands 41D, 42D, 43D and the outer fixing bands 61D, 62D, 63D in the battery cell 24D, the inner fixing bands 41E, 42E, 43E and the outer fixing bands 61E, 62E, 63E in the battery cell 24E, and the inner fixing bands 41F, 42F, 43F and the outer fixing bands 61F, 62F, 63F in the battery cell 24F do not overlap in the stacking direction.

[0066] Therefore, in Figure 6 In the illustrated cell stack 240 , the increase in thickness of the cell stack as a whole due to the fixing tape can be suppressed. Therefore, the thickness of the cell stack can be reduced, the volume efficiency can be improved, and the energy density can be improved.

[0067] In addition, Figure 6 In the illustrated single cell stack 240, in one battery cell 24D, the winding positions of the inner fixing bands 41D, 42D, 43D do not overlap with the winding positions of the outer fixing bands 61D, 62D, 63D. Similarly, in one battery cell 24E, the winding positions of the inner fixing bands 41E, 42E, 43E do not overlap with the winding positions of the outer fixing bands 61E, 62E, 63E. Furthermore, in one battery cell 24F, the winding positions of the inner fixing bands 41F, 42F, 43F do not overlap with the winding positions of the outer fixing bands 61F, 62F, 63F.

[0068] Therefore, in Figure 6 In the cell stack 240 shown, the increase in thickness of the cell stack as a whole caused by the winding positions of the inner and outer fixing bands in one battery cell can be suppressed. Thus, the thickness of the cell stack can be reduced, the volume efficiency can be improved, and the energy density can be increased.

[0069] Here, in Figure 3 The first embodiment of the single cell stack shown in FIG. Figure 5 The single cell stack of the second embodiment shown in FIG. Figure 6 In the third embodiment of the single battery stack, the winding positions of the fixing tapes do not overlap in the stacking direction between all the battery cells, but the invention is not limited thereto. For example, the winding positions of the fixing tapes do not overlap in the stacking direction between all the adjacent battery cells, while the winding positions of the fixing tapes overlap in the stacking direction in a portion of the non-adjacent battery cells.

[0070] For example, Figure 7 The single battery stack 222 shown has a structure in which three battery cells 22L, 22M, and 22N are stacked. Furthermore, between all adjacent battery cells, that is, between adjacent battery cells 22L and battery cells 22M, and between adjacent battery cells 22M and battery cells 22N, the winding positions of the fixing bands do not overlap in the stacking direction. Specifically, the winding positions of the outer fixing bands 61L, 62L, 63L, 64L, and 65L in the battery cell 22L and the outer fixing bands 61M, 62M, 63M, 64M, and 65M in the battery cell 22M adjacent to the battery cell 22L do not overlap in the stacking direction. In addition, the winding positions of the outer fixing bands 61M, 62M, 63M, 64M, and 65M in the battery cell 22M and the outer fixing bands 61N, 62N, 63N, 64N, and 65N in the battery cell 22N adjacent to the battery cell 22M do not overlap in the stacking direction. On the other hand, the outer fixing bands 61L, 62L, 63L, 64L, 65L in the battery cell 22L and the outer fixing bands 61N, 62N, 63N, 64N, 65N in the battery cell 22N not adjacent to the battery cell 22L are wound at positions overlapping in the stacking direction.

[0071] like Figure 7 As shown, by not having the winding positions of the fixing tapes overlap each other in the stacking direction between all adjacent battery cells, the increase in thickness of the entire battery stack caused by the fixing tapes can be suppressed. This can reduce the thickness of the battery stack, improve volume efficiency, and increase energy density.

[0072] In addition, Figure 3 The first embodiment of the single cell stack shown in FIG. Figure 5 The single cell stack of the second embodiment shown in FIG. Figure 6 The third type of single cell stack shown in the figure shows an example of a single cell stack in which three battery cells are stacked, but the present invention is not limited thereto. For example, the number of battery cells stacked in the single cell stack may be 2 or more, 10 or more battery cells may be stacked, or 20 or more battery cells may be stacked.

[0073] In any of the above cases, the fixing belt is wound between at least one group of adjacent battery cells, and the winding positions of the fixing belt do not overlap in the stacking direction. In addition, preferably, the fixing belt is wound between all adjacent battery cells, and the winding positions of the fixing belt do not overlap in the stacking direction. Furthermore, more preferably, the fixing belt is wound between all battery cells, and the winding positions of the fixing belt do not overlap in the stacking direction.

[0074] Next, a battery module, a battery pack, and a vehicle including a cell stack according to an embodiment of the present disclosure will be described using the drawings.

[0075] Figure 8 FIG. 1 is a schematic plan view showing the main parts of a vehicle 100 to which the battery pack 10 according to the embodiment is applied. Figure 8 As shown, the vehicle 100 is an electric vehicle (BEV) in which the battery pack 10 is mounted under the floor. In addition, the arrows UP, FR, and LH in each figure respectively represent the upper side in the vehicle vertical direction, the front side in the vehicle front-back direction, and the left side in the vehicle width direction. When the front-back, left-right, up-down and down directions are used for explanation, unless otherwise stated, they represent the front-back in the vehicle front-back direction, the left-right in the vehicle width direction, and the up-down in the vehicle vertical direction.

[0076] The vehicle 100 of the present embodiment, as an example, is provided with a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 at a position closer to the front side of the vehicle than the battery pack 10. In addition, a motor 108, a gear box 110, an inverter 112, and a charger 114 are provided at a position closer to the rear side of the vehicle than the battery pack 10.

[0077] The DC current output from the battery pack 10 is regulated in voltage by the DC / DC converter 102 and then supplied to the electric compressor 104, the PTC heater 106, the inverter 112, etc. In addition, the rear wheels rotate and the vehicle 100 travels by supplying electric power to the motor 108 via the inverter 112.

[0078] A charging port 116 is provided on the right side of the rear portion of the vehicle 100 . A charging plug of an external charging device (not shown) is connected to the charging port 116 , thereby allowing electric power to be stored in the battery pack 10 via the charger 114 .

[0079] In addition, the configuration and structure of each component constituting the vehicle 100 are not limited to the above structure. For example, it can also be applied to a hybrid vehicle (HV: Hybrid Vehicle) or a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle) equipped with an engine. In addition, in the present embodiment, it is a rear-wheel drive vehicle with an electric motor 108 mounted at the rear of the vehicle, but it is not limited to this. It can also be a front-wheel drive vehicle with an electric motor 108 mounted at the front of the vehicle, and a pair of electric motors 108 can also be mounted at the front and rear of the vehicle. Furthermore, it can also be a vehicle equipped with an in-wheel motor on each wheel.

[0080] Here, the battery pack 10 is configured to include a plurality of battery modules 11. In the present embodiment, as an example, 10 battery modules 11 are provided. Specifically, on the right side of the vehicle 100, five battery modules 11 are arranged in the vehicle front-rear direction, and on the left side of the vehicle 100, five battery modules 11 are arranged in the vehicle front-rear direction. In addition, the battery modules 11 are electrically connected to each other.

[0081] Fig. 9 1 is a schematic three-dimensional diagram of the battery module 11. Fig. 9 As shown, the battery module 11 is formed into a substantially rectangular parallelepiped shape with the vehicle width direction as the length direction. In addition, the outer shell of the battery module 11 is formed of an aluminum alloy. For example, an aluminum casting is joined to both ends of an aluminum alloy extrusion by laser welding or the like, thereby forming the outer shell of the battery module 11.

[0082] A pair of voltage terminals 12 and a connector 14 are provided at both ends of the battery module 11 in the vehicle width direction. A flexible printed circuit board 22 described later is connected to the connector 14. In addition, bus bars (not shown) are welded to both ends of the battery module 11 in the vehicle width direction.

[0083] The battery module 11 has a length MW in the vehicle width direction of, for example, 350 mm to 600 mm, a length ML in the vehicle front-rear direction of, for example, 150 mm to 250 mm, and a height MH in the vehicle up-down direction of, for example, 80 mm to 110 mm.

[0084] Fig.10 FIG. 1 is a plan view of the battery module 11 with the upper cover removed. Fig.10 As shown, a plurality of battery cells 20 are housed in an aligned state inside the battery module 11. In the present embodiment, as an example, 24 battery cells 20 are aligned in the vehicle front-rear direction and bonded to each other.

[0085] A flexible printed circuit (FPC) 22 is disposed on the battery cell 20. The flexible printed circuit 22 is formed in a strip shape with the vehicle width direction as the longitudinal direction, and thermistors 24 are provided at both ends of the flexible printed circuit 22. The thermistor 24 is not bonded to the battery cell 20, but is pressed toward the battery cell 20 by the upper cover of the battery module 11.

[0086] In addition, one or more buffers (not shown) are accommodated inside the battery module 11. For example, the buffer is a thin plate-shaped member that can be elastically deformed and is arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 as the thickness direction. In this embodiment, as an example, buffers are arranged at both ends and the center of the battery module 11 in the longitudinal direction.

[0087] Fig.11 2 is a schematic diagram of a battery cell 20 housed in a battery module 11 as viewed from the thickness direction. Fig.11 As shown, the battery cell 20 is formed in a substantially rectangular plate shape, and contains an electrode body (not shown) inside. The electrode body is formed by laminating a positive electrode, a negative electrode, and a separator, and is sealed by a lamination film 28.

[0088] In this embodiment, as an example, the receiving portion of the electrode body is formed by folding and laminating the embossed sheet-shaped laminated film 28. In addition, two structures can be adopted, namely, a single embossed structure in which embossing is performed at one location and a double embossed structure in which embossing is performed at two locations. In this embodiment, a single embossed structure with a drawing depth of about 8 mm to 10 mm is used.

[0089] The upper ends of both ends of the battery cell 20 in the longitudinal direction are bent to form an angular shape. In addition, the upper end of the battery cell 20 is bent.

[0090] Here, terminals (electrode pieces) 26 are provided at both ends of the battery cell 20 in the longitudinal direction. In this embodiment, as an example, the terminals 26 are provided below the vertical center of the battery cell 20. The terminals 26 are joined to bus bars (not shown) by laser welding or the like.

[0091] The length CW1 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, the length CW2 of the region accommodating the electrode body 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 the height CH of the battery cell 20 is, for example, 80 mm to 110 mm, 110 mm to 140 mm. In addition, 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 terminal 26 is 40 mm to 50 mm, 50 mm to 60 mm, or 60 mm to 70 mm.

Claims

1. A single battery stack, formed by stacking a plurality of battery cells, wherein the battery cells have: Electrode body; a laminated outer package that covers the electrode body and seals the electrode body therein; and At least one of the inner fixing belt and the outer fixing belt, the inner fixing belt is wound around the outer peripheral surface of the electrode body along the circumferential direction inside the stacked outer packaging body, and the outer fixing belt is wound around the outer peripheral surface of the stacked outer packaging body along the circumferential direction, wherein, When the direction in which the plurality of battery cells are stacked is taken 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 between at least one set of adjacent battery cells.

2. The single cell stack according to claim 1, wherein: As the fixing belt, only the inner fixing belt is provided, The inner fixing band is wound so that the winding positions of the inner fixing band do not overlap in the stacking direction between at least one set of adjacent battery cells.

3. The single cell stack according to claim 1, wherein: As the fixing belt, only the outer fixing belt is provided, The outer fixing band is wound so that the wound positions of the outer fixing band do not overlap in the stacking direction between at least one set of adjacent battery cells.

4. The single cell stack according to claim 1, wherein: As the fixing belt, there are the inner fixing belt and the outer fixing belt, The inner fixing band and the outer fixing band are wound so that the wound positions of the inner fixing band and the outer fixing band do not overlap in the stacking direction between at least one set of adjacent battery cells.

5. The single cell stack according to claim 4, wherein: The fixing tape is wound so that a winding position of the inner fixing tape and a winding position of the outer fixing tape in one battery cell do not overlap.

6. The single cell stack according to claim 1, wherein: The fixing tape is wound so that the winding positions of the fixing tape do not overlap in the stacking direction between all the adjacent battery cells.

7. The single cell stack according to claim 6, wherein: The fixing tape is wound so that the wound positions of the fixing tape do not overlap with each other in the stacking direction among all the battery cells.

8. A battery module, wherein: A single cell stack according to any one of claims 1 to 7.

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