Cell lamination body and battery module

Abstract

To provide a cell lamination body which has a volumetric efficiency enhanced.SOLUTION: In a cell lamination body, a plurality of battery cells having an electrode body, a laminate outer casing sealed into an internal part so as to cover the electrode body, and at least one fixing tape of an inner side fixing tape wound in a peripheral direction to an outer peripheral surface of the electrode body in an inner side of the laminate outer casing and an outer side fixing tape wound in the peripheral direction to the outer peripheral surface of the laminate outer casing are laminated. In the case where a direction in which the plurality of battery cells are laminated is defined as a lamination direction, the fixing tape is wound so that positions of winding of the fixing tape do not overlap with each other in the lamination direction in both of at least a pair of adjacent battery cells.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] 2. Description of the Related Art Battery cells in which electrode assemblies, each of which is made up of a plurality of stacked positive electrodes, negative electrodes, and separators, are bound together with tape, have been under study.

[0003] For example, Patent Document 1 discloses a secondary battery including a laminate in which positive electrodes and negative electrodes are alternately stacked with separators between them, and a tape for fixing the laminate, the tape having a pair of flat attachment portions provided at both ends and attached to both outermost layers of the laminate, respectively, and an intermediate portion located between the pair of flat attachment portions and attached to the side edges of each layer of the laminate, the flat attachment portions having a tapered shape with an acute angle at the tip. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-15212 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, the electrode body constituting a battery and the laminated exterior body covering the electrode body have been fixed by wrapping a fixing tape around them. Examples of the fixing tape include an inner fixing tape wrapped around the outer circumferential surface of the electrode body inside the laminated exterior body, and an outer fixing tape wrapped around the outer circumferential surface of the laminated exterior body. However, when the fixing tape is wrapped around the battery, the thickness of the battery increases by the amount of the fixing tape, leaving room for improvement in the volumetric efficiency.

[0006] The present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide a cell stack with improved volumetric efficiency, and a battery module having the cell stack. [Means for solving the problem]

[0007] Means for solving the above problems include the following aspects. <1> An electrode body; A laminate exterior body that covers and encloses the electrode body; At least one of an inner fixing tape wound circumferentially around the outer circumferential surface of the electrode body inside the laminate exterior body and an outer fixing tape wound circumferentially around the outer circumferential surface of the laminate exterior body; A cell stack in which a plurality of battery cells having the above structure are stacked, When the direction in which the battery cells are stacked is defined as the stacking direction, the fixing tape is wrapped around at least one pair of adjacent battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction. <2> The fixing tape includes only the inner fixing tape, the inner fixing tape is wound around at least one pair of adjacent battery cells such that the winding positions of the inner fixing tape do not overlap in the stacking direction; <1> The cell stack according to claim 1. <3> The fixing tape includes only the outer fixing tape, the outer fixing tape is wound around at least one pair of adjacent battery cells such that the winding positions of the outer fixing tape do not overlap in the stacking direction; <1> The cell stack according to claim 1. <4> The fixing tape includes the inner fixing tape and the outer fixing tape, the inner fixing tape and the outer fixing tape are wound such that the winding positions of the inner fixing tape and the winding positions of the outer fixing tape do not overlap in the stacking direction between at least one pair of adjacent battery cells; <1> The cell stack according to claim 1. <5> the fixing tape is wound such that a winding position of the inner fixing tape does not overlap a winding position of the outer fixing tape in one of the battery cells; <4> The cell stack according to claim 1. <6> the fixing tape is wound around all the adjacent battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction; <1> ~ <5> 13. The cell stack according to claim 12 . <7> the fixing tape is wound around all of the battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction; <1> ~ <6> 13. The cell stack according to claim 12 . <8> <1> ~ <7> 13. A battery module comprising the cell stack according to claim 12. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a cell stack with improved volumetric efficiency, and a battery module having the cell stack. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic perspective view showing one electrode assembly and an inner fixing tape in a cell stack according to the first embodiment. [Diagram 2] 2 is a schematic side view showing a battery cell in which one electrode body and an inner fixing tape shown in FIG. 1 are further encapsulated in a laminate exterior body. FIG. [Diagram 3] FIG. 1 is a schematic side view showing a cell stack according to a first embodiment. [Figure 4]11 is a schematic side view showing a battery cell in which one electrode assembly and a laminate exterior body are fixed by an outer fixing tape in a cell stack according to a second embodiment. FIG. [Diagram 5] FIG. 4 is a schematic side view showing a cell stack according to a second embodiment. [Figure 6] FIG. 11 is a schematic side view showing a cell stack according to a third embodiment. [Figure 7] FIG. 11 is a schematic side view showing a cell stack according to a modified example. [Figure 8] FIG. 2 is a schematic plan view showing a main part of the vehicle. [Figure 9] FIG. 2 is a schematic perspective view of a battery module. [Figure 10] FIG. 2 is a plan view of the battery module with the top cover removed. [Figure 11] 3 is a schematic diagram of a battery cell accommodated in a battery module as viewed from the thickness direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment that is an example of the present disclosure will be described. These descriptions and examples are merely illustrative of the embodiment, and are not intended to limit the scope of the invention. In the present specification, the upper or lower limit of one numerical range may be replaced with the upper or lower limit of another numerical range. In addition, in the present specification, the upper or lower limit of the numerical range may be replaced with a value shown in the examples.

[0011] <Cell stack> A cell stack according to an embodiment of the present disclosure is a cell stack in which a plurality of battery cells are stacked together, the battery cell having an electrode assembly, a laminate exterior body that covers the electrode assembly and encloses it therein, and at least one of an inner fixing tape wound circumferentially around the outer circumferential surface of the electrode assembly inside the laminate exterior body and an outer fixing tape wound circumferentially around the outer circumferential surface of the laminate exterior body. When the direction in which the multiple battery cells are stacked is defined as the stacking direction, the fixing tape is wrapped around at least one pair of adjacent battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction.

[0012] For example, when a battery cell has only an inner fixing tape as the fixing tape, the inner fixing tape is wrapped around at least one pair of adjacent battery cells so that the winding positions of the inner fixing tape do not overlap in the stacking direction. Furthermore, when the battery cells have only an outer fixing tape as the fixing tape, the outer fixing tape is wrapped around at least one pair of adjacent battery cells so that the winding positions of the outer fixing tape do not overlap in the stacking direction. Furthermore, when the battery cell has an inner fixing tape and an outer fixing tape as fixing tapes, the inner fixing tape and the outer fixing tape are wound so that, for at least one pair of adjacent battery cells, none of the winding positions of the inner fixing tape and the outer fixing tape overlap in the stacking direction.

[0013] Conventionally, in batteries, a cell stack has been used, which has an electrode body and a laminated exterior body covering the electrode body, and in which the electrode body and the laminated exterior body are stacked. The electrode body in the cell stack is fixed with a fixing tape. Examples of the fixing tape include an inner fixing tape wound in the circumferential direction around the outer circumferential surface of the electrode body inside the laminated exterior body, and an outer fixing tape wound in the circumferential direction around the outer circumferential surface of the laminated exterior body. However, when the fixing tape is wound around the cell stack, the thickness of the cell stack increases due to the thickness of the fixing tape, and therefore there is room for improvement in improving the volumetric efficiency.

[0014] In contrast, in the cell stack according to the embodiment of the present disclosure, 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 pair of adjacent battery cells. If the winding positions of the fixing tape overlap between adjacent battery cells, the thickness will increase by the amount of two sheets of fixing tape. However, in the cell stack according to the embodiment of the present disclosure, the positions of the fixing tape do not overlap between adjacent battery cells, and the increase in the thickness of the entire cell stack due to the fixing tape can be suppressed. In this way, by suppressing the overlap of the fixing tape, the thickness of the cell stack can be reduced, the volumetric efficiency can be improved, and the energy density can be increased.

[0015] In the cell stack according to the embodiment of the present disclosure, as described above, it is sufficient that the fixing tape is wrapped around at least one pair of adjacent battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction. However, it is preferable that the fixing tape is wrapped around all adjacent battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction. Furthermore, it is more preferable that the fixing tape is wrapped around all battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction.

[0016] First aspect Hereinafter, one aspect (first aspect) of a cell stack according to an embodiment of the present disclosure will be described with reference to the drawings. The drawings shown below are schematic diagrams, and the size and shape of each part are appropriately exaggerated to make them easier to understand.

[0017] Fig. 1 is a schematic perspective view showing one electrode assembly and an inner fixing tape in a cell stack according to the first embodiment. Fig. 2 is a schematic side view showing a battery cell in which one electrode assembly and the inner fixing tape shown in Fig. 1 are further encapsulated in a laminate exterior body, as viewed from the side direction of the electrode assembly (the X direction in Fig. 1). The electrode body 4 shown in Figures 1 and 2 is formed in a substantially rectangular plate shape. Although not shown, the electrode body 4 has a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The electrode body 4 may have a structure in which a laminated structure having a positive electrode, a negative electrode, and a separator is further laminated in the direction of the arrow Y (stacking direction).

[0018] The electrode body 4 has terminals (tabs) 26 on each of the longitudinal side surfaces. In this embodiment, as an example, the terminals 26 are provided at positions offset to one side from the center of the battery cell 20 in the short side direction (arrow X direction).

[0019] Five inner fixing tapes 41-45 are attached so as to be wrapped around the entire circumference of the outer circumferential surface of the electrode body 4. Each of the inner fixing tapes 41-45 is wrapped around the entire circumference of the four surfaces of the electrode body 4 on which the terminals 26 are not provided. When the electrode body 4 has a structure in which a laminate structure having a positive electrode, a negative electrode, and a separator is further laminated in the lamination direction (arrow Y direction), the inner fixing tapes 41-45 are wrapped around the outer circumferential surface to bundle the laminated structures. The electrode body 4 fixed by the five inner fixing tapes 41 to 45 is covered with and enclosed inside a laminate film 28, which is an example of a laminate exterior body, as shown in Fig. 2. Note that Fig. 2 shows a side view showing the inside of the laminate film 28.

[0020] Although Figures 1 and 2 show an embodiment in which the electrode body 4 is fixed with five inner fixing tapes 41 to 45, this is not limited to this, and the number of inner fixing tapes wrapped around one electrode body 4 may be one or more.

[0021] The cell stack according to the first embodiment further includes a plurality of battery cells, each of which is shown in Figures 1 and 2, stacked as shown in Figure 3. Figure 3 is a schematic side view showing the cell stack according to the first embodiment, as seen from the side direction of the electrode body (X direction in Figure 1). Note that Figure 3 shows a side view showing the inside of the laminate film.

[0022] 3, the cell stack 200 has a structure in which three battery cells 20A, 20B, and 20C are stacked. The winding positions of the fixing tapes do not overlap in the stacking direction between any of the adjacent battery cells, that is, between the adjacent battery cells 20A and 20B, and between the adjacent battery cells 20B and 20C. Specifically, the winding positions of the inner fixing tapes 41A, 42A, 43A, 44A, and 45A of the battery cell 20A and the inner fixing tapes 41B, 42B, 43B, 44B, and 45B of the battery cell 20B adjacent to the battery cell 20A do not overlap in the stacking direction. Furthermore, the winding positions of the inner fixing tapes 41B, 42B, 43B, 44B, and 45B of the battery cell 20B and the inner fixing tapes 41C, 42C, 43C, 44C, and 45C of the battery cell 20C adjacent to the battery cell 20B do not overlap in the stacking direction. Furthermore, the winding positions of the fixing tapes do not overlap in the stacking direction among all of the battery cells, that is, among battery cell 20A, battery cell 20B, and battery cell 20C. Specifically, the winding positions of the inner fixing tapes 41A, 42A, 43A, 44A, and 45A in battery cell 20A, the inner fixing tapes 41B, 42B, 43B, 44B, and 45B in battery cell 20B, and the inner fixing tapes 41C, 42C, 43C, 44C, and 45C in battery cell 20C do not all overlap in the stacking direction. 3, the increase in the overall thickness of the cell stack 200 due to the fixing tape can be suppressed, which allows the thickness of the cell stack to be reduced, improving the volumetric efficiency and increasing the energy density.

[0023] Second aspect Next, another embodiment (second embodiment) of the cell stack according to the embodiment of the present disclosure will be described with reference to the drawings.

[0024] FIG. 4 is a schematic side view showing a battery cell in a cell stack according to the second embodiment, in which one electrode assembly and a laminate exterior body are fixed by an outer fixing tape. The electrode body 4 shown in Fig. 4 has terminals (tabs) 26 on each of the longitudinal side surfaces. The electrode body 4 is covered with and enclosed inside a laminate film 28, which is an example of a laminate exterior body. Note that Fig. 4 shows a side view showing the inside of the laminate film 28.

[0025] Five outer fixing tapes 61-65 are arranged on the electrode body 4 enclosed in the laminate film 28 and are attached so as to be wrapped around the outer circumferential surface of the laminate film 28. Each of the outer fixing tapes 61-65 is wrapped around the four surfaces of the laminate film 28 on which no terminals 26 are present. Although FIG. 4 shows an embodiment in which the laminate film 28 is fixed with five outer fixing tapes 61 to 65, this is not limited to this, and the number of outer fixing tapes wrapped around the laminate film 28 may be one or more.

[0026] The cell stack according to the second embodiment further includes a plurality of battery cells as shown in Fig. 4 stacked together as shown in Fig. 5. Fig. 5 is a schematic side view showing the cell stack according to the second embodiment, as viewed from the side of the electrode assembly. Note that Fig. 5 shows a side view showing the inside of the laminate film.

[0027] 5, the cell stack 220 has a structure in which three battery cells 22A, 22B, and 22C are stacked. The winding positions of the fixing tapes do not overlap in the stacking direction between any of the adjacent battery cells, that is, between the adjacent battery cells 22A and 22B, and between the adjacent battery cells 22B and 22C. Specifically, the winding positions of the outer fixing tapes 61A, 62A, 63A, 64A, and 65A of the battery cell 22A and the outer fixing tapes 61B, 62B, 63B, 64B, and 65B of the battery cell 22B adjacent to the battery cell 22A do not overlap in the stacking direction. Furthermore, the wrapping positions of the outer fixing tapes 61B, 62B, 63B, 64B, and 65B of the battery cell 22B and the outer fixing tapes 61C, 62C, 63C, 64C, and 65C of the battery cell 22C adjacent to the battery cell 22B do not overlap in the stacking direction. Furthermore, the winding positions of the fixing tapes do not overlap in the stacking direction among all the battery cells, that is, among the battery cells 22A, 22B, and 22C. Specifically, the winding positions of the outer fixing tapes 61A, 62A, 63A, 64A, and 65A in the battery cell 22A, the outer fixing tapes 61B, 62B, 63B, 64B, and 65B in the battery cell 22B, and the outer fixing tapes 61C, 62C, 63C, 64C, and 65C in the battery cell 22C do not all overlap in the stacking direction. 5, the increase in the overall thickness of the cell stack caused by the fixing tape can be suppressed, thereby reducing the thickness of the cell stack, improving volumetric efficiency, and increasing energy density.

[0028] Third aspect Next, another embodiment (third embodiment) of the cell stack according to the embodiment of the present disclosure will be described with reference to the drawings.

[0029] Fig. 6 is a schematic side view showing a cell stack according to a third embodiment, as viewed from a side of the electrode assembly, showing the inside of the laminate film.

[0030] First, one battery cell 24D in the cell stack 240 shown in Fig. 6 will be described. The electrode body 4 in the battery cell 24D has terminals (tabs) 26 on each of the longitudinal side surfaces. Three inner fixing tapes 41D-43D are attached to the outer circumferential surface of the electrode body 4 so as to be wrapped around the entire circumference. Each of the inner fixing tapes 41D-43D is wrapped around the four surfaces of the electrode body 4 on which the terminals 26 are not provided. The electrode body 4 fixed by the three inner fixing tapes 41D-43D is covered with and enclosed inside a laminate film 28, which is an example of a laminate exterior body. Furthermore, the electrode body 4 enclosed in the laminate film 28 has three outer fixing tapes 61D-63D attached so as to be wrapped around the outer circumferential surface of the laminate film 28. Each of the outer fixing tapes 61D-63D is wrapped around the four surfaces of the laminate film 28 on which no terminals 26 are present. That is, the battery cell 24D is fixed by inner fixing tapes 41D to 43D wrapped directly around the outer peripheral surface of the electrode body 4, and outer fixing tapes 61D to 63D wrapped around the outer peripheral surface of the laminate film .

[0031] 6 shows battery cells 24D, 24E, and 24F each fixed with three inner fixing tapes and three outer fixing tapes, this is not limited to this. The number of inner fixing tapes wound around one electrode body 4 needs to be one or more, and the number of outer fixing tapes wound around laminate film 28 needs to be one or more.

[0032] The cell stack 240 according to the third embodiment has a structure in which three battery cells 24D, 24E, and 24F are stacked. The winding positions of the fixing tapes of all the adjacent battery cells, that is, the adjacent battery cells 24D and 24E, and the adjacent battery cells 24E and 24F, do not overlap in the stacking direction. Specifically, the winding positions of the inner fixing tapes 41D, 42D, and 43D and the outer fixing tapes 61D, 62D, and 63D of the battery cell 24D do not overlap with the winding positions of the inner fixing tapes 41E, 42E, and 43E and the outer fixing tapes 61E, 62E, and 63E of the battery cell 24E adjacent to the battery cell 24D in the stacking direction. Furthermore, the winding positions of 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 adjacent to the battery cell 24E do not overlap in the stacking direction. Furthermore, the winding positions of the fixing tapes do not overlap in the stacking direction among all the battery cells, that is, among the battery cells 24D, 24E, and 24F. Specifically, the winding positions of the inner fixing tapes 41D, 42D, and 43D and the outer fixing tapes 61D, 62D, and 63D in the battery cell 24D, the inner fixing tapes 41E, 42E, and 43E and the outer fixing tapes 61E, 62E, and 63E in the battery cell 24E, and the inner fixing tapes 41F, 42F, and 43F and the outer fixing tapes 61F, 62F, and 63F in the battery cell 24F do not all overlap in the stacking direction. 6, the increase in the overall thickness of the cell stack caused by the fixing tape can be suppressed, and the thickness of the cell stack can be reduced, improving the volumetric efficiency and increasing the energy density.

[0033] 6, in one battery cell 24D, 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. Similarly, in one 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 further, in one 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. 6, it is possible to suppress an increase in the thickness of the entire cell stack caused by the winding positions of the inner fixing tape and the outer fixing tape in one battery cell. This makes it possible to reduce the thickness of the cell stack, improve volumetric efficiency, and increase energy density.

[0034] Modifications Here, in the cell stack of the first embodiment shown in Fig. 3, the cell stack of the second embodiment shown in Fig. 5, and the cell stack of the third embodiment shown in Fig. 6, the wrapping positions of the fixing tape do not overlap in the stacking direction for all the battery cells, but this is not limited to this. For example, the wrapping positions of the fixing tape may not overlap in the stacking direction for all adjacent battery cells, while the wrapping positions of the fixing tape may overlap in the stacking direction for some of the non-adjacent battery cells.

[0035] For example, the cell stack 222 shown in Fig. 7 has a structure in which three battery cells 22L, 22M, and 22N are stacked. The winding positions of the fixing tapes of all adjacent battery cells, that is, the adjacent battery cells 22L and 22M, and the adjacent battery cells 22M and 22N, do not overlap in the stacking direction. Specifically, the winding positions of the outer fixing tapes 61L, 62L, 63L, 64L, and 65L of the battery cell 22L and the outer fixing tapes 61M, 62M, 63M, 64M, and 65M of the battery cell 22M adjacent to the battery cell 22L do not overlap in the stacking direction. Furthermore, the winding positions of the outer fixing tapes 61M, 62M, 63M, 64M, and 65M of the battery cell 22M and the outer fixing tapes 61N, 62N, 63N, 64N, and 65N of the battery cell 22N adjacent to the battery cell 22M do not overlap in the stacking direction. On the other hand, the winding positions of the outer fixing tapes 61L, 62L, 63L, 64L, and 65L of the battery cell 22L and the outer fixing tapes 61N, 62N, 63N, 64N, and 65N of the battery cell 22N not adjacent to the battery cell 22L do overlap in the stacking direction. As shown in Figure 7, the wrapping positions of the fixing tape between all adjacent battery cells do not overlap in the stacking direction, which makes it possible to suppress the increase in thickness of the entire cell stack caused by the fixing tape. This makes it possible to reduce the thickness of the cell stack, improve volumetric efficiency, and increase energy density.

[0036] In addition, the cell stack of the first embodiment shown in Fig. 3, the cell stack of the second embodiment shown in Fig. 5, and the cell stack of the third embodiment shown in Fig. 6 are all examples of cell stacks in which three battery cells are stacked, but the present invention is not limited to this. For example, the number of battery cells stacked in the cell stack may be two or more, and 10 or more battery cells may be stacked, or 20 or more battery cells may be stacked. In either case, the fixing tape is wound such that the winding positions of the fixing tape do not overlap in the stacking direction between at least one pair of adjacent battery cells. Note that it is preferable that the fixing tape is wound such that the winding positions of the fixing tape do not overlap in the stacking direction between all adjacent battery cells. Furthermore, it is more preferable that the fixing tape is wound such that the winding positions of the fixing tape do not overlap in the stacking direction between all battery cells.

[0037] Next, a battery module, a battery pack, and a vehicle having a cell stack according to an embodiment of the present disclosure will be described with reference to the drawings.

[0038] (Overall configuration of vehicle 100) Fig. 8 is a schematic plan view showing a main part of a vehicle 100 to which a battery pack 10 according to an embodiment is applied. As shown in Fig. 8, the vehicle 100 is an electric vehicle (BEV: Battery Electric Vehicle) in which the battery pack 10 is mounted under the floor. Note that the arrows UP, FR, and LH in each figure indicate the upper side in the vehicle vertical direction, the front side in the vehicle front-rear direction, and the left side in the vehicle width direction, respectively. When describing using the front-rear, left-right, up-down directions, they refer to the front-rear in the vehicle front-rear direction, the left-right in the vehicle width direction, and the up-down in the vehicle vertical direction, unless otherwise specified.

[0039] As an example, in the vehicle 100 of this embodiment, a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 are disposed on the vehicle front side of the battery pack 10. In addition, a motor 108, a gear box 110, an inverter 112, and a charger 114 are disposed on the vehicle rear side of the battery pack 10.

[0040] The direct current output from the battery pack 10 has its voltage adjusted by a DC / DC converter 102, and is then supplied to an electric compressor 104, a PTC heater 106, an inverter 112, etc. In addition, power is supplied to a motor 108 via the inverter 112, causing the rear wheels to rotate and causing the vehicle 100 to run.

[0041] A charging port 116 is provided on the right side at the rear of the vehicle 100, and by connecting a charging plug of an external charging facility (not shown) to the charging port 116, power can be stored in the battery pack 10 via the charger 114.

[0042] The arrangement and structure of each component constituting the vehicle 100 are not limited to the above-mentioned configuration. For example, the present invention may be applied to a hybrid vehicle (HV: Hybrid Vehicle) equipped with an engine or a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle). In addition, in the present embodiment, the vehicle is a rear-wheel drive vehicle in which the motor 108 is mounted at the rear of the vehicle, but the present invention is not limited to this. The vehicle may be a front-wheel drive vehicle in which the motor 108 is mounted at the front of the vehicle, or a pair of motors 108 may be mounted at the front and rear of the vehicle. Furthermore, the vehicle may be equipped with an in-wheel motor on each wheel.

[0043] Here, the battery pack 10 is configured to include a plurality of battery modules 11. As an example in this embodiment, ten battery modules 11 are provided. Specifically, five battery modules 11 are arranged on the right side of the vehicle 100 in the vehicle front-rear direction, and five battery modules 11 are arranged on the left side of the vehicle 100 in the vehicle front-rear direction. In addition, each battery module 11 is electrically connected.

[0044] Fig. 9 is a schematic perspective view of the battery module 11. As shown in Fig. 9, the battery module 11 is formed in a substantially rectangular parallelepiped shape with the vehicle width direction as the longitudinal direction. The outer shell of the battery module 11 is formed of an aluminum alloy. For example, the outer shell of the battery module 11 is formed by joining aluminum die castings to both ends of an aluminum alloy extrusion material by laser welding or the like.

[0045] 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, which will be 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.

[0046] The length MW of the battery module 11 in the vehicle width direction is, for example, 350 mm to 600 mm, the length ML in the vehicle front-rear direction is, for example, 150 mm to 250 mm, and the height MH in the vehicle up-down direction is, for example, 80 mm to 110 mm.

[0047] Fig. 10 is a plan view of the battery module 11 with the top cover removed. As shown in Fig. 10, a plurality of battery cells 20 are housed in an arranged state inside the battery module 11. In this embodiment, as an example, 24 battery cells 20 are arranged in the front-rear direction of the vehicle and bonded to one another.

[0048] A flexible printed circuit (FPC) 22 is disposed on the battery cells 20. The flexible printed circuit 22 is formed in a strip shape with the vehicle width direction as the longitudinal direction, and a thermistor 24 is provided on each of both ends of the flexible printed circuit 22. The thermistor 24 is not bonded to the battery cells 20, and is configured to be pressed towards the battery cells 20 by the upper lid of the battery module 11.

[0049] One or more cushioning materials (not shown) are housed inside the battery module 11. For example, the cushioning materials are elastically deformable thin plate-like members, and are arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 being the thickness direction. As an example in this embodiment, cushioning materials are arranged at both ends of the battery module 11 in the longitudinal direction and in the central portion in the longitudinal direction.

[0050] Fig. 11 is a schematic diagram of a battery cell 20 housed in a battery module 11, viewed from the thickness direction. As shown in Fig. 11, the battery cell 20 is formed in a substantially rectangular plate shape, and houses an electrode body (not shown) inside. The electrode body is configured by laminating a positive electrode, a negative electrode, and a separator, and is sealed with a laminate film 28.

[0051] In this embodiment, as an example, the housing portion for the electrode body is formed by folding and pasting an embossed sheet-like laminate film 28. Note that although both a single cup embossed structure in which embossing is performed at one place and a double cup embossed structure in which embossing is performed at two places can be adopted, the present embodiment adopts a single cup embossed structure with a drawing depth of about 8 mm to 10 mm.

[0052] The upper ends of the battery cells 20 at both ends in the longitudinal direction are bent to form corners. The upper end of the battery cells 20 is also bent.

[0053] Here, terminals (tabs) 26 are provided at both longitudinal ends of the battery cell 20. In this embodiment, as an example, the terminals 26 are provided at positions offset downward from the vertical center of the battery cell 20. The terminals 26 are joined to a bus bar (not shown) by laser welding or the like.

[0054] 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 to 900 mm, 1000 mm or more, the length CW2 of the region in which the electrode body is housed is, for example, 500 mm to 520 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 to 900 mm, 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. The thickness of the battery cell 20 is 5.0 mm to 7.0 mm, 7.0 mm to 9.0 mm, 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, 60 mm to 70 mm. [Explanation of symbols]

[0055] 4 Electrode body, 10 Battery pack, 11 Battery module, 12 Voltage terminal, 14 Connector, 20, 20A, 20B, 20C, 22, 22A, 22B, 22C, 22L, 22M, 22N, 24D, 24E, 24F Battery cell, 22 Flexible printed circuit board, 24 Thermistor, 26 Terminal, 28 Laminate film, 41, 41A, 41B, 41C, 41D, 41E, 41F, 42, 42A, 42B, 42C, 42D, 42E, 42F, 43, 43A, 43B, 43C, 43D, 43E, 43F, 44, 44A, 44B, 44C, 45, 45A, 45B, 45C Inner 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 Outer fixing tape, 100 Vehicle, 102 Converter, 104 Electric compressor, 106 Heater, 108 Motor, 110 Gearbox, 112 Inverter, 114 Charger, 116 Charging port, 200, 220, 222, 240 cell stack

Claims

1. An electrode body; A laminate exterior body that covers and encloses the electrode body; At least one of an inner fixing tape wound circumferentially around the outer circumferential surface of the electrode body inside the laminate exterior body and an outer fixing tape wound circumferentially around the outer circumferential surface of the laminate exterior body; A cell stack in which a plurality of battery cells having the above structure are stacked, When the direction in which the battery cells are stacked is defined as the stacking direction, the fixing tape is wrapped around at least one pair of adjacent battery cells such that the winding positions of the fixing tape do not overlap in the stacking direction.

2. The fixing tape includes only the inner fixing tape, The cell stack according to claim 1 , wherein the inner fixing tape is wrapped around at least one pair of adjacent battery cells such that the winding positions of the inner fixing tape do not overlap in the stacking direction.

3. The fixing tape includes only the outer fixing tape, The cell stack according to claim 1 , wherein the outer fixing tape is wrapped around at least one pair of adjacent battery cells such that the wrapping positions of the outer fixing tape do not overlap in the stacking direction.

4. The fixing tape includes the inner fixing tape and the outer fixing tape, 2. The cell stack according to claim 1, wherein the inner fixing tape and the outer fixing tape are wound such that the winding positions of the inner fixing tape and the outer fixing tape do not overlap in the stacking direction between at least one pair of adjacent battery cells.

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

6. The cell stack according to claim 1 , wherein the fixing tape is wrapped around all of the adjacent battery cells such that the wrapping positions of the fixing tape do not overlap in the stacking direction.

7. The cell stack according to claim 6 , wherein the fixing tape is wrapped around all of the battery cells such that the wrapping positions of the fixing tape do not overlap in the stacking direction.

8. A battery module comprising the cell stack according to any one of claims 1 to 7.

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