Battery, battery module, and method for manufacturing battery

Abstract

The invention relates to a battery, a battery module and a manufacturing method of the battery. Provided is a battery (10) in a state in which an electrode body (30) including an electrode and a separator and an exterior body (20A, 20B) disposed around the electrode body (30) are constrained by a constraining member, the battery (10) being characterized in that the electrode body (30) has an adhesive portion in which the electrode is adhered to the separator and an unadhesive portion in which the electrode is not adhered to the separator, and the exterior body (20A, 20B) is disposed around the electrode body (30). At least a portion of the non-bonded portion of the electrode body (30) coincides with a portion (40) of the battery constrained by the constraining member.

Description

Technical Field

[0001] The present disclosure relates to a battery, a battery module, and a method for manufacturing a battery. Background Art

[0002] Generally, a lithium ion secondary battery is manufactured by injecting an electrolyte into an outer casing containing an electrode assembly including electrodes and a separator. In order to ensure the close contact between the electrodes and the separator and to maintain a constant distance between the electrodes, the electrodes are sometimes bonded to the separator.

[0003] On the other hand, when the electrode is in a state of being bonded to the separator, it is difficult for the electrolyte to penetrate into the electrode body, and improvement of the efficiency of the electrolyte injection work has become a problem.

[0004] As a method for improving the permeability of the electrolyte solution to the electrode body, Patent Document 1, for example, proposes providing a portion where the electrode and the separator are not bonded when bonding the electrode constituting the electrode body to the separator.

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2002-15773 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the battery described in Patent Document 1, there is a possibility that a predetermined distance between the electrodes cannot be maintained at a portion where the electrodes are not bonded to the separator.

[0010] An object of one embodiment of the present disclosure is to provide a battery having excellent permeability of an electrolyte solution into an electrode body and capable of maintaining a good distance between electrodes, a battery module including the battery, and a method for manufacturing the battery.

[0011] Solutions to Solve Problems

[0012] Means for solving the above-mentioned problems include the following embodiments.

[0013] <1> A battery comprising an electrode body and an outer casing and constrained by a constraining member, wherein the electrode body comprises an electrode and a separator, and the outer casing is disposed around the electrode body, wherein:

[0014] The electrode body has a bonding portion where the electrode is bonded to the separator and a non-bonding portion where the electrode is not bonded to the separator.

[0015] At least a portion of the unbonded portion of the electrode body coincides with a portion of the battery that is constrained by the constraining member.

[0016] <2> The battery according to <1>, wherein all of the unbonded portion of the electrode body coincides with a portion of the battery constrained by the constraining member.

[0017] <3> The battery according to <1> or <2>, wherein the unbonded portion of the electrode assembly completely coincides with a portion of the battery constrained by the constraining member.

[0018] A battery module, comprising the battery according to any one of <1> to <3>.

[0019] <5> A method for manufacturing a battery, wherein the battery is the battery described in any one of <1> to <3>, wherein the method for manufacturing the battery comprises:

[0020] A step of preparing an electrode body having a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator;

[0021] A step of disposing an outer casing around the electrode body;

[0022] a step of supplying an electrolyte solution into the interior of the outer casing; and

[0023] A step of disposing a restraining member around the outer casing.

[0024] <6> A method for manufacturing a battery, wherein the battery is the battery described in any one of <1> to <3>, wherein the method for manufacturing the battery comprises:

[0025] A step of preparing an electrode body having a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator;

[0026] The step of disposing a restraining member around the electrode body;

[0027] A step of disposing an outer casing around the electrode body having a restraining member disposed therearound; and

[0028] A step of supplying an electrolyte solution into the interior of the outer casing.

[0029] Effects of the Invention

[0030] According to one embodiment of the present disclosure, there are provided a battery having excellent permeability of an electrolyte solution into an electrode body and capable of maintaining a good distance between electrodes, a battery module including the battery, and a method for manufacturing the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a cross-sectional view schematically showing an example of the battery of the present disclosure.

[0032] Figure 2This is a cross-sectional view schematically showing an example of the battery of the present disclosure.

[0033] Figure 3 This is a cross-sectional view schematically showing an example of the battery of the present disclosure.

[0034] Figure 4 This is a graph showing the evaluation results of the permeability of the electrode assembly.

[0035] Figure 5 This is a diagram schematically showing an example of application of a battery to an electric vehicle.

[0036] Figure 6 This is a diagram schematically showing an example of the structure of a battery module.

[0037] Figure 7 This is a diagram schematically showing an example of the structure of a battery module.

[0038] Figure 8 This is a diagram schematically showing an example of the structure of a battery cell included in a battery module. DETAILED DESCRIPTION

[0039] In the present disclosure, a numerical range expressed using "to" means a range including the numerical values ​​described before and after "to" as the minimum value and the maximum value, respectively.

[0040] In the numerical range recorded in stages in the present disclosure, the upper limit or lower limit recorded in a certain numerical range can also be replaced by the upper limit or lower limit of the numerical range recorded in other stages. In the numerical range recorded in the present disclosure, the upper limit or lower limit recorded in a certain numerical range can also be replaced by the value shown in the embodiment.

[0041] In the present disclosure, the term "process" includes not only an independent process but also a process that cannot be clearly distinguished from other processes as long as the intended purpose of the process can be achieved.

[0042] In the present disclosure, when an embodiment is described with reference to the drawings, the structure of the embodiment is not limited to the structure shown in the drawings. In addition, the sizes of components in each figure are conceptual, and the relative relationship between the sizes of the components is not limited to this.

[0043] <Battery>

[0044] A first embodiment of the present disclosure provides a battery, the battery comprising an electrode body and an outer casing and being restrained by a restraining member, the electrode body comprising an electrode and a separator, the outer casing being arranged around the electrode body, wherein:

[0045] The electrode body has a bonding portion where the electrode is bonded to the separator and a non-bonding portion where the electrode is not bonded to the separator.

[0046] At least a portion of the unbonded portion of the electrode body coincides with a portion of the battery that is constrained by the constraining member.

[0047] In the battery of the present disclosure, the electrode body has a bonded portion where the electrode and the separator are bonded and a non-bonded portion where the electrode and the separator are not bonded. Therefore, compared with an electrode body where the electrode and the separator are completely bonded, good permeability of the electrolyte can be ensured.

[0048] Moreover, in the battery of the present disclosure, at least a portion of the unbonded portion of the electrode is consistent with the portion of the battery constrained by the constraining member. That is, at least a portion of the unbonded portion of the electrode is in a state of being compressed by the constraining member. Therefore, the distance between the electrodes at at least a portion of the unbonded portion of the electrode can be well maintained.

[0049] Hereinafter, the electrode body, the exterior body, and the restraining member included in the battery of the present disclosure will be described.

[0050] (Electrode body)

[0051] The type of electrode body is not particularly limited and can be selected according to the scale and purpose of the battery.

[0052] As the electrode body, for example, a stacked body in which electrodes (negative electrode and positive electrode) and a separator disposed between the electrodes are stacked can be used.

[0053] The number of electrodes and separators included in the electrode body is not particularly limited and can be selected according to the scale and purpose of the battery.

[0054] The size of the electrode body is not particularly limited and can be selected according to the scale and purpose of the battery. For example, the area of ​​the main surface of the electrode body can be from 50 cm 2 ~50000cm 2 The thickness of the electrode body can be selected from a range of 5 mm to 50 mm.

[0055] As the electrode, for example, an electrode in which a layer containing an electrode active material is formed on one surface or both surfaces of a current collector can be used.

[0056] As the separator, for example, a microporous film made of a resin such as polyethylene can be used.

[0057] The electrode body has a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator.

[0058] The bonding of the electrode and the separator can be performed, for example, by heating the adhesive while it is arranged between the electrode and the separator.

[0059] As the adhesive, for example, polyvinylidene fluoride (PVdF), a hot-melt acrylic resin, or the like can be used.

[0060] When the electrode body includes a plurality of electrodes and a plurality of separators, electrodes bonded to separators and electrodes not bonded to separators may coexist at the same location of the electrode body, or all electrodes may be bonded to separators at the same location of the electrode body.

[0061] In the present disclosure, a portion where at least one electrode is bonded to the separator is referred to as a "bonded portion", and a portion where neither electrode is bonded to the separator is referred to as a "non-bonded portion".

[0062] From the viewpoint of ensuring the permeability of the electrolyte, the ratio of the unbonded portion to the area of ​​the main surface of the electrode body is preferably 1% or more, more preferably 5% or more, and even more preferably 10% or more.

[0063] From the viewpoint of maintaining a good distance between electrodes, the ratio of the unbonded portion to the area of ​​the main surface of the electrode body is preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less.

[0064] When the unbonded portion is provided in a pattern on the electrode body, the form of the pattern is not particularly limited, and may be, for example, in the form of lines, dots, grids, or a combination thereof.

[0065] As a method for providing the unbonded portion in a pattern on the electrode body, for example, a method of pressing the electrode body with a roller having recesses on its surface can be cited. By this method, the unbonded portion in a pattern corresponding to the shape of the recesses of the roller can be provided on the electrode body.

[0066] In the battery of the present disclosure, at least a portion of the unbonded portion of the electrode body coincides with a portion of the battery constrained by the constraining member.

[0067] In the present disclosure, a portion of the battery that is restrained by a restraining member is also referred to as a “restraint portion” of the battery.

[0068] From the viewpoint of maintaining a good distance between electrodes at the unbonded portion of the electrode body, it is preferred that more than 50%, more than 60%, more than 70%, more than 80%, more than 90% or 100% (i.e., all unbonded portions) of the total area of ​​the unbonded portion of the electrode body be consistent with the restraint portion of the battery.

[0069] From the viewpoint of maintaining a good distance between electrodes at the unbonded portion of the electrode body, it is preferred that the unbonded portion of the electrode body completely coincide with the constrained portion of the battery.

[0070] That is, it is preferred that all of the unbonded portions of the electrode body coincide with the constrained portion of the battery, and that no unbonded portion of the electrode body exists in the portion of the battery that does not coincide with the constrained portion.

[0071] (outer body)

[0072] The type of the outer casing is not particularly limited as long as it can accommodate the electrode assembly.

[0073] As the outer casing, a laminate having a heat seal layer and a metal layer containing a metal such as aluminum (so-called laminate film) may be used. That is, the battery of the present disclosure may be a battery using a laminate film as an outer casing (so-called laminate battery).

[0074] The outer casing may be a single member or may be composed of two or more members. For example, when the outer casing is a sheet-like object, the outer casing may be composed of one sheet-like object or two sheet-like objects.

[0075] (Constraint member)

[0076] The type of the restraining member is not particularly limited as long as it can restrain the battery.

[0077] From the viewpoint of workability when the restraining member is arranged around the outer body, it is preferable to use a tape as the restraining member. The width of the tape is not particularly limited, and can be selected from a range of 5 mm to 100 mm, for example.

[0078] The restraining member may also have heat shrinkability. If the restraining member has heat shrinkability, the restraining member disposed around the outer body will shrink due to heating, and the battery can be compressed by the restraining member. The heat source for heating can be the heat generated by the charging and discharging of the battery, or the heat provided by a heater or the like during the manufacture of the battery.

[0079] Examples of the material of the heat-shrinkable restraining member include polyamide (nylon), polypropylene, polyester, polyethylene, polyethylene terephthalate, and polystyrene.

[0080] In the battery disclosed herein, the configuration of the parts constrained by the constraining member is not particularly limited. For example, the parts constrained by the constraining member may be dispersedly configured at 1 to 10 parts of the periphery of the battery or electrode body. Alternatively, the constraining member may be configured to cover the entire periphery of the battery or electrode body.

[0081] <Battery Module>

[0082] A second embodiment of the present disclosure is a battery module including the above-mentioned battery.

[0083] In the present disclosure, a battery module refers to an object including a collection of a plurality of batteries (cells). The number of batteries included in one battery module is not particularly limited, and may be within a range of 5 to 30, for example.

[0084] The form in which the batteries included in the battery module are constrained by the constraining member is not particularly limited. For example, the constraining member may be arranged on at least one selected from the periphery of the assembly of multiple batteries included in the battery module, the periphery of each battery included in the assembly, or the periphery of the electrode body of each battery included in the assembly.

[0085] <Battery Manufacturing Method>

[0086] A third embodiment of the present disclosure is a method for manufacturing a battery according to the first embodiment, wherein the method for manufacturing a battery comprises:

[0087] A step of preparing an electrode body having a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator;

[0088] A step of disposing an outer casing around the electrode body;

[0089] a step of supplying an electrolyte solution into the interior of the outer casing; and

[0090] A step of disposing a restraining member around the outer casing.

[0091] In the present embodiment, the method for obtaining the electrode body having the bonded portion where the electrode and the separator are bonded and the unbonded portion where the electrode and the separator are not bonded is not particularly limited, and can be carried out by a known method.

[0092] For example, an adhesive may be disposed at a predetermined location between the electrode and the separator, and heating and pressurization may be performed as necessary to bond the electrode and the separator.

[0093] In the present embodiment, the method of placing the outer casing around the electrode body is not particularly limited. For example, when a laminate film is used as the outer casing, the outer casing can be placed around the electrode body by the following method 1 or method 2.

[0094] Method 1: A method in which the electrode body is disposed between a laminate film folded in half or between two laminate films stacked together, and the laminate films surrounding the electrode body are joined by heat sealing;

[0095] Method 2: A method in which a laminate film folded in half or two laminate films stacked together are joined around their peripheries by heat sealing, and the electrode body is disposed in a space surrounded by the joined portions of the laminate films.

[0096] If necessary, a concave portion for accommodating the electrode body may be formed in the laminate film.

[0097] In the present embodiment, the method of supplying the electrolyte solution into the interior of the outer casing is not particularly limited, and can be carried out by a known method.

[0098] The supply of the electrolyte solution may be performed in a state where the outer casing is arranged so that the opening of the outer casing housing the electrode assembly (the electrolyte solution injection port) faces upward when viewed in the gravity direction.

[0099] From the viewpoint of improving the permeability of the electrolyte solution into the electrode body, the internal space of the outer casing may be depressurized before supplying the electrolyte solution.

[0100] In this embodiment, since the electrode body is provided with an unbonded portion where the electrode is not bonded to the separator, the internal space of the outer body can be depressurized smoothly compared to a case where the electrode body is not provided with an unbonded portion, and the electrolyte can be smoothly infiltrated into the electrode body.

[0101] The supply of the electrolyte solution to the internal space of the outer casing may be performed all at once or in multiple times.

[0102] The method of sealing the opening of the outer casing after supplying the electrolyte is not particularly limited, and the method can be carried out by a known method.

[0103] In the present embodiment, the method of arranging the restraint member around the exterior body is not particularly limited, and can be implemented by a known method.

[0104] The position where the restraining member is disposed is not particularly limited as long as it coincides with at least a portion of the unbonded portion of the electrode assembly where the electrode and the separator are not bonded.

[0105] In the present embodiment, the order of performing the step of supplying the electrolyte solution into the interior of the outer casing and the step of disposing the restraint member around the outer casing is not particularly limited, and either step may be performed first.

[0106] A fourth embodiment of the present disclosure is a method for manufacturing a battery according to the first embodiment, wherein the method for manufacturing a battery comprises:

[0107] A step of preparing an electrode body having a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator;

[0108] The step of disposing a restraining member around the electrode body;

[0109] A step of disposing an outer casing around the electrode body having a restraining member disposed therearound; and

[0110] A step of supplying an electrolyte solution into the interior of the outer casing.

[0111] The manufacturing method of the fourth embodiment can be implemented in the same manner as the manufacturing method of the third embodiment, except that the restraint member is disposed around the electrode body instead of being disposed around the outer casing.

[0112] In the manufacturing method of the fourth embodiment, in addition to arranging the restraint member around the electrode body, a restraint member may be arranged around the outer casing.

[0113] The battery of the present disclosure will be described with reference to the accompanying drawings.

[0114] Figure 1 This is a cross-sectional view schematically showing an example of the battery of the present disclosure.

[0115] Figure 1 The battery 10 shown includes a first external housing 20A, a second external housing 20B, and an electrode assembly 30 disposed between the first external housing 20A and the second external housing 20B.

[0116] The first outer casing 20A and the second outer casing 20B constitute an outer casing that accommodates the electrode body 30 by joining their respective portions corresponding to the periphery of the electrode body 30 to each other.

[0117] The battery 10 includes a restraint portion 40 restrained by a restraint member (not shown) disposed on the outer periphery of the battery 10 (ie, outside the outer casing).

[0118] The battery 10 may be further restrained by a restraining member disposed on the outer periphery of the electrode body 30 (ie, inside the outer casing).

[0119] Although not shown, the electrode body 30 includes a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator, and at least a portion of the non-bonded portion is disposed in the restraining portion 40 .

[0120] Figure 2 This is a cross-sectional view schematically showing an example of the battery of the present disclosure.

[0121] exist Figure 2 The battery 10 shown in the figure has a restraining portion 40 restrained by a restraining member arranged on the outer periphery of the electrode body 30 (that is, inside the outer casing), and Figure 1 The batteries 10 shown are identical.

[0122] Figure 3 It is a cross-sectional view schematically showing one form of the battery of the present disclosure, and showing a state in which an assembly of a plurality of batteries 10 is restrained by a restraining member.

[0123] exist Figure 3In the assembly of batteries 10 shown, the restraint portion 40 may be in a state of being restrained by restraint members arranged on the periphery of the assembly of batteries 10, or in a state of being restrained by restraint members arranged on the periphery of each battery 10, or in a state of being restrained by restraint members arranged on the periphery of an electrode body included in each battery 10, or in a state of a combination of the above situations.

[0124] <Evaluation of the permeability of the electrode body>

[0125] The permeability of the electrolyte solution into the electrode body in which the electrode and the separator were bonded together and the electrode body in which the electrode and the separator were not bonded together were compared.

[0126] Specifically, an electrode body having a stacked structure with 7 positive electrode layers and 8 negative electrode layers was produced using a diaphragm having a PVdF-based adhesive layer on both sides (adhered) or a diaphragm having an Al2O3-based heat-resistant layer on one side (not bonded). The size of the diaphragm is 144.9 cm × 80.7 cm. A laminated battery (5Ah) was produced using this electrode body, and an electrolyte was added. CT images of the laminated battery were taken every hour from the time the electrolyte was added, and the penetration distance of the electrolyte was investigated. Figure 4 The results are shown in .

[0127] like Figure 4 As shown, the electrode body in a state where the electrode is not bonded to the separator (non-bonded) has a longer permeation distance per unit time than the electrode body in which the electrode is bonded to the separator (bonded), and is superior in permeability.

[0128] <Battery application examples>

[0129] The battery of the present disclosure may also be mounted on an electric vehicle. Hereinafter, an example in which the battery of the present disclosure is applied to an electric vehicle will be described with reference to the accompanying drawings. In the following description, the "battery cell 20" corresponds to the battery of the present disclosure.

[0130] Figure 5 1 is a schematic top view showing the main parts of a vehicle 100 to which a battery pack 10 including the battery of the present disclosure is applied. Figure 5 As shown, the vehicle 100 is an electric vehicle (BEV) equipped with a battery pack 10 under the floor. In addition, the arrow UP, arrow FR, and arrow LH in each figure respectively 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. When the front-rear, left-right, and up-down directions are used for description, unless otherwise specified, they are assumed to indicate the front-rear direction of the vehicle front-rear direction, the left-right direction of the vehicle width direction, and the up-down direction of the vehicle.

[0131] As an example, the vehicle 100 is provided with a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 on the vehicle front side relative to the battery pack 10. In addition, a motor 108, a gear box 110, an inverter 112, and a charger 114 are provided on the vehicle rear side relative to the battery pack 10.

[0132] The DC current output from battery pack 10 is supplied to electric compressor 104, PTC heater 106, inverter 112, etc. after the voltage is adjusted by DC / DC converter 102. In addition, by supplying power to motor 108 via inverter 112, rear wheels are rotated and vehicle 100 travels.

[0133] A charging port 116 is provided at the right side of the rear portion of the vehicle 100 . By connecting a charging plug of an external charging device (not shown) to the charging port 116 , electric power can be stored in the battery pack 10 via the charger 114 .

[0134] In addition, the configuration and structure of each component constituting the vehicle 100 are not limited to the above-mentioned 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, a rear-wheel drive vehicle is provided in which the motor 108 is mounted at the rear of the vehicle, but it is not limited to this. It can be provided as a front-wheel drive vehicle in which the motor 108 is mounted at the front of the vehicle, or a pair of motors 108 can be mounted at the front and rear of the vehicle. Moreover, it can also be a vehicle with an in-wheel motor in each wheel.

[0135] 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, five battery modules 11 are arranged on the right side of the vehicle 100 along the vehicle front-rear direction, and five battery modules 11 are arranged on the left side of the vehicle 100 along the vehicle front-rear direction. In addition, each battery module 11 is electrically connected.

[0136] Figure 6 1 is a schematic three-dimensional diagram of the battery module 11. Figure 6 As shown, the battery module 11 is formed into a substantially rectangular parallelepiped shape with the vehicle width direction as the long side direction. In addition, the outer shell of the battery module 11 is formed of an aluminum alloy. For example, an aluminum die 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.

[0137] 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. Bus bars (not shown) are welded to both ends of the battery module 11 in the vehicle width direction.

[0138] 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.

[0139] Figure 7 FIG. 1 is a top view of the battery module 11 after the upper cover is removed. Figure 7 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.

[0140] 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 long side 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.

[0141] 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 long side direction.

[0142] Figure 8 2 is a schematic diagram of a battery cell 20 housed in a battery module 11 as viewed from the thickness direction. Figure 8 As shown, the battery cell 20 is formed in a substantially rectangular plate shape, and an electrode body (not shown) is accommodated therein. The electrode body is formed by laminating a positive electrode, a negative electrode, and a separator, and is sealed by a laminate film 22 .

[0143] In this embodiment, as an example, the accommodating portion of the electrode body is formed by folding and laminating the embossed sheet-shaped laminate film 22. The laminate film 22 may have any structure of a single cup embossed structure in which the embossing is performed at one location or a double cup embossed structure in which the embossing is performed at two locations. The laminate film 22 in one embodiment has a single cup embossed structure with a drawing depth of about 8 mm to 10 mm.

[0144] The upper ends of both ends of the battery cell 20 in the longitudinal direction are bent, and the corners form an outer shape. In addition, the upper end of the battery cell 20 is bent, and a fixing band 24 is wound around the upper end of the battery cell 20 along the longitudinal direction.

[0145] Terminals (tabs) 26 are provided at both ends of the battery cell 20 in the longitudinal direction. In the present 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 bus bars (not shown) by laser welding or the like.

[0146] For example, the length CW1 of the battery cell 20 in the vehicle width direction is 530mm~600mm, 600mm~700mm, 700mm~800mm, 800~900mm or 1000mm or more, the length CW2 of the area accommodating the electrode body is 500mm~520mm, 600mm~700mm, 700mm~800mm, 800~900mm or 1000mm or more, the height CH is 80mm~110mm or 110mm~140mm, the thickness is 5.0mm~7.0mm, 7.0mm~9.0mm or 9.0mm~11.0mm, and the height TH of the terminal 26 is 40mm~50mm, 50mm~60mm or 60mm~70mm.

Claims

1. A battery, comprising an electrode body and an outer casing and being constrained by a constraining member, wherein the electrode body comprises an electrode and a separator, and the outer casing is arranged around the electrode body, wherein: The electrode body has a bonding portion where the electrode is bonded to the separator and a non-bonding portion where the electrode is not bonded to the separator. At least a portion of the unbonded portion of the electrode body coincides with a portion of the battery that is constrained by the constraining member.

2. The battery according to claim 1, wherein The entirety of the unbonded portion of the electrode body coincides with the portion of the battery restrained by the restraining member.

3. The battery according to claim 1, wherein The unbonded portion of the electrode body completely coincides with the portion of the battery restrained by the restraining member.

4. A battery module, wherein: The battery module includes the battery according to any one of claims 1 to 3.

5. A method for manufacturing a battery, wherein the battery is the battery according to any one of claims 1 to 3, wherein: The manufacturing method of the battery comprises: A step of preparing an electrode body having a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator; A step of disposing an outer casing around the electrode body; a step of supplying an electrolyte solution into the interior of the outer casing; and A step of disposing a restraining member around the outer casing.

6. A method for manufacturing a battery, wherein the battery is the battery according to any one of claims 1 to 3, wherein: The manufacturing method of the battery comprises: A step of preparing an electrode body having a bonded portion where the electrode is bonded to the separator and a non-bonded portion where the electrode is not bonded to the separator; The step of disposing a restraining member around the electrode body; A step of disposing an outer casing around the electrode body having a restraining member disposed therearound; and A step of supplying an electrolyte solution into the interior of the outer casing.

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