Battery module

Abstract

To provide a battery module in which each of a plurality of battery cells can be positioned for a case that forms a unit including the battery cells.SOLUTION: A plurality of battery cells 100 are arranged side by side in a first direction and each have a prismatic shape. A case 140 accommodates the plurality of battery cells 100 and supports the plurality of battery cells in at least a first direction, the case forming a unit 10 including the plurality of battery cells 100. The case 140 includes a first end portion 162 and a second end portion 152 arranged side by side and facing each other in a second direction orthogonal to the first direction. The first end portion 162 is provided with a biasing portion 163 that is deformed, when one battery cell 100 of the plurality of battery cells 100 is inserted into the case 140, to bias the battery cell 100 toward the second end portion 152 of the case 140. The second end portion 152 is provided with a reference surface 153 to position the battery cell 100 in the second direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present technology relates to a battery module. [Background technology]

[0002] Japanese Patent Application Laid-Open No. 2017-162810 (Patent Document 1) is a prior art document that discloses the configuration of a battery module. The battery module described in Patent Document 1 secures battery cells and separators with plates having pins, and battery cell units made by stacking battery cells and separators are restrained by a frame.

[0003] Japanese Patent Application Laid-Open No. 2017-37789 (Patent Document 2) is a prior art document that discloses the configuration of a battery module. The battery module described in Patent Document 2 has a protrusion on one side of the battery cell or separator and a recess on the other side, and by fitting the protrusion and recess together, it prevents misalignment of stacked battery cells. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-162810 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-37789 Summary of the Invention [Problem to be solved by the invention]

[0005] In some battery module configurations, a single unit is formed by housing multiple battery cells in a case, and the multiple units are arranged and constrained in the stacking direction of the battery cells. In this case, the battery module configurations described in Patent Documents 1 and 2 do not allow the individual battery cells to be positioned relative to the case.

[0006] The present technology has been made to solve the above-mentioned problems, and aims to provide a battery module that can position battery cells relative to a case that forms a unit including multiple battery cells. [Means for solving the problem]

[0007] The present technology provides the following battery module. [1] a plurality of battery cells arranged side by side in a first direction and each having a rectangular shape; a case that houses the plurality of battery cells and supports them in at least the first direction, forming a unit that includes the plurality of battery cells; the case includes a first end and a second end that are aligned and opposed to each other in a second direction that is perpendicular to the first direction; a biasing portion is provided at the first end portion, the biasing portion being deformed when one of the plurality of battery cells is inserted into the case, thereby biasing the battery cell toward the second end portion of the case; The battery module has a reference surface at the second end for positioning the battery cell in the second direction. [2] The battery module according to [1], wherein the biasing portion undergoes plastic deformation when the battery cell is inserted into the case. [3] The battery module according to [1] or [2], wherein the battery cells are inserted into the case along a third direction perpendicular to the first direction and the second direction. [4] The battery module according to [3], wherein a tapered portion extending along the third direction is provided so as to be continuous with the biasing portion or the reference surface. [5] The battery module according to any one of [1] to [4], wherein the biasing portion is a rib that protrudes from the first end toward a housing of the battery cell. [6] The battery module according to [5], wherein the rib is integrally formed with the case. [7] The battery module according to [5] or [6], wherein the rib is inclined at an angle of 20° to 45° with respect to the first direction. [Effects of the Invention]

[0008] According to this technology, the battery cells are pressed by the biasing portion and pressed against a reference surface provided on the case, thereby positioning the battery cells relative to the case that forms a unit including multiple battery cells. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a configuration of a battery module according to an embodiment of the present technology; [Figure 2] 1 is a perspective view showing an internal configuration of a battery module according to an embodiment of the present technology; [Figure 3] 1 is a perspective view showing a configuration of a unit included in a battery module according to an embodiment of the present technology; [Figure 4] 1 is a perspective view showing a configuration of a battery cell included in a battery module according to an embodiment of the present technology; [Figure 5] 1 is a cross-sectional view showing a configuration of a case included in a battery module according to an embodiment of the present technology; [Figure 6] 6 is a perspective view of the case of FIG. 5 as seen from the direction of arrow VI. [Figure 7] 1 is a cross-sectional view showing a configuration of a biasing portion included in a battery module according to an embodiment of the present technology; DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present technology will be described. Note that the same or corresponding parts are denoted by the same reference characters, and description thereof may not be repeated.

[0011] In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present technology is not necessarily limited to those numbers, amounts, etc., unless otherwise specified. Furthermore, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. Furthermore, the present technology is not necessarily limited to those that achieve all of the effects and advantages mentioned in the present embodiments.

[0012] In this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain feature is included, other features may or may not be included.

[0013] Furthermore, when geometric terms and terms expressing positional and directional relationships are used in this specification, such as "parallel," "orthogonal," "45° diagonal," "coaxial," and "along," these terms allow for manufacturing errors and slight variations. When terms expressing relative positional relationships, such as "upper side" and "lower side," are used in this specification, these terms are used to indicate relative positional relationships in a single state, and the relative positional relationships can be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, by turning the entire mechanism upside down).

[0014] In this specification, the term "battery" is not limited to lithium-ion batteries, but may include other batteries such as nickel-metal hydride batteries and sodium-ion batteries. In this specification, the term "electrode" may collectively refer to a positive electrode and a negative electrode.

[0015] The "battery module" can be installed in hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs), etc. However, the use of the "battery module" is not limited to in-vehicle use.

[0016] In the drawings, the direction in which the positive and negative terminals of the battery cells are aligned is the X direction as the second direction, the direction in which multiple battery cells are stacked is the Y direction as the first direction, and the height direction of the battery module is the Z direction as the third direction.

[0017] Fig. 1 is a perspective view showing a configuration of a battery module according to an embodiment of the present technology, and Fig. 2 is a perspective view showing an internal configuration of a battery module according to an embodiment of the present technology.

[0018] First, we will explain the overall structure of the battery module 1. As shown in Figures 1 and 2, the battery module 1 includes a plurality of units 10, end plates 20, restraining members 30, bus bars 40, cover members 60, gas ducts 70, and terminal members 80.

[0019] The plurality of units 10 are arranged side by side in a first direction (Y direction). Six of the plurality of units 10 according to this embodiment are arranged side by side in the Y direction. The number of the plurality of units 10 is not particularly limited as long as it is two or more.

[0020] The plurality of units 10 are sandwiched between two end plates 20. The plurality of units 10 according to this embodiment are pressed against the end plates 20 and are restrained between the two end plates 20.

[0021] The end plates 20 are provided at both ends of the multiple units 10 in the Y direction. The end plates 20 are fixed to a base such as a pack case that houses the battery modules 1. The end plates 20 are made of, for example, aluminum or iron.

[0022] The restraining members 30 are provided on both ends of the multiple units 10 and end plates 20 in the X direction. When the restraining members 30 are engaged with the end plates 20 while a compressive force in the Y direction is applied to the multiple units 10 and end plates 20 arranged side by side, and the compressive force is then released, a tensile force acts on the restraining members 30 connecting the two end plates 20. In reaction to this, the restraining members 30 press the two end plates 20 in a direction that brings them closer to each other. As a result, the restraining members 30 restrain the multiple units 10 in a first direction (Y direction).

[0023] The restraining member 30 includes a plate-shaped portion 300, a first flange portion 320, and a second flange portion 330. The restraining member 30 is made of, for example, iron.

[0024] The plate-shaped portion 300 is a member extending in the Y direction. A plurality of openings 310 are provided in the plate-shaped portion 300. The plurality of openings 310 are provided at intervals in the Y direction. The openings 310 are constituted by through-holes that penetrate the plate-shaped portion 300 in the X direction.

[0025] The first flange portion 320 wraps around from the side surface of the plurality of units 10 to the top surface of the plurality of units 10. By providing the first flange portion 320, the rigidity of the restraint member 30, which is formed relatively thin, can be ensured.

[0026] The second flange portion 330 is connected to both ends of the plate-shaped portion 300 in the Y direction. The second flange portion 330 is fixed to the end plate 20. The second flange portion 330 is fixed to the end plate 20 by a known fixing method such as bolt fastening. In this way, the restraint member 30 connects the two end plates 20 to each other.

[0027] 2, busbar 40 is made of a conductor and includes a first busbar portion (not shown), a second busbar portion 420, and a third busbar portion 430.

[0028] The first busbar portion (not shown) electrically connects the multiple battery cells in the unit 10 to each other. The second busbar portion 420 electrically connects the battery cell arranged at one end in the Y direction to the positive terminal member 80. The third busbar portion 430 electrically connects the battery cell arranged at the other end in the Y direction to the negative terminal member 80.

[0029] 1, the cover member 60 protects the electrical connections of the battery module 1. The cover member 60 is located above the units 10 and covers conductors such as the bus bars 40. The gas duct 70 extends in the Y direction. The gas duct 70 is disposed between the multiple units 10 and the cover member 60 in the Z direction.

[0030] The terminal members 80 are arranged on both sides of the multiple units 10 arranged side by side in the Y direction. The terminal members 80 are provided at positions that substantially overlap the end plates 20 when viewed from the Z direction. The terminal members 80 connect the battery module 1 to external wiring such as cables (not shown) that are arranged outside the battery module 1.

[0031] Next, a description will be given of the structure of the unit 10. Fig. 3 is a perspective view showing the configuration of a unit included in a battery module according to an embodiment of the present technology.

[0032] As shown in FIG. 3, each of the plurality of units 10 includes a plurality of battery cells 100 and a case 140 .

[0033] Each unit 10 includes two or more battery cells 100. The unit 10 according to an embodiment of the present technology includes two battery cells 100, which is an even number. The number of battery cells 100 included in each of the multiple units 10 is not particularly limited as long as it is two or more. The number of battery cells 100 included in each of the multiple units 10 may also be an odd number.

[0034] The plurality of battery cells 100 are arranged side by side in a first direction (Y direction). Two of the plurality of battery cells 100 according to an embodiment of the present technology are arranged side by side in the Y direction. The arrangement direction of the plurality of units 10 and the arrangement direction of the plurality of battery cells 100 in each of the plurality of units 10 are the same direction.

[0035] The case 140 has a rectangular parallelepiped appearance. The case 140 houses a plurality of battery cells 100 and supports them in at least a first direction (Y direction). The case 140 is formed of a resin such as polypropylene. As shown in FIGS. 1 and 2, the case 140 is compressed in the first direction (Y direction) by a restraining member 30.

[0036] As shown in FIG. 3, the case 140 has a front wall portion 150, a rear wall portion 160, a first side wall portion 170, a second side wall portion 171, and an upper surface portion 180.

[0037] The front wall portion 150 is a surface adjacent to one of the restraining members 30. A first duct portion 151 is provided on the front wall portion 150. The first duct portion 151 protrudes from the front wall portion 150 toward the one of the restraining members 30. The first duct portion 151 is provided so as to penetrate the front wall portion 150 in the X direction.

[0038] The rear wall portion 160 is a surface that faces the front wall portion 150 in the X direction, with multiple battery cells 100 sandwiched between them. A second duct portion 161 is provided on the rear wall portion 160. The second duct portion 161 protrudes from the rear wall portion 160 toward the other restraint member 30. The second duct portion 161 is provided so as to penetrate the rear wall portion 160 in the X direction. The second duct portion 161 communicates with the first duct portion 151 by a cooling medium passage, which will be described later.

[0039] The first side wall portion 170 and the second side wall portion 171 are arranged side by side in the first direction (Y direction) and face each other.

[0040] The top surface portion 180 includes a plurality of wall portions 181, an engagement surface 182, and a plurality of hole portions 183. The plurality of wall portions 181 are erected in the Z direction. The plurality of wall portions 181 define an installation location for the bus bar 40. The engagement surface 182 is engaged with a first flange portion 320 of the restraint member 30. The plurality of hole portions 183 are provided so that the electrode terminal 110 and the gas release valve 130, which will be described later, are exposed from the top surface portion 180.

[0041] FIG. 4 is a perspective view showing a configuration of a battery cell included in a battery module according to an embodiment of the present technology.

[0042] 4, the battery cell 100 is, for example, a lithium ion battery. The battery cell 100 has a rectangular shape. The output density of the battery cell 100 is, for example, about 8000 W / L or more. The voltage of the battery cell 100 is, for example, about 1.0 V or more.

[0043] The battery cell 100 according to this embodiment includes an electrode terminal 110, a housing 120, and a gas release valve .

[0044] The electrode terminals 110 are formed on the housing 120. The electrode terminals 110 include a positive terminal 111 and a negative terminal 112 as two electrode terminals 110 arranged along the second direction (X direction).

[0045] The positive electrode terminal 111 and the negative electrode terminal 112 are provided apart from each other in the second direction (X direction). The positive electrode terminal 111 and the negative electrode terminal 112 are provided on both sides of the gas duct 70 in the second direction (X direction). The positive electrode terminal 111 and the negative electrode terminal 112 are joined to the bus bar 40 by laser welding or the like.

[0046] The housing 120 has a rectangular parallelepiped shape and forms the exterior of the battery cell 100. An electrode assembly and an electrolyte (not shown) are housed in the housing 120. The housing 120 has a sealing plate 121 on its top. The sealing plate 121 seals the electrode assembly and the electrolyte inside the housing 120.

[0047] The gas exhaust valve 130 is provided on the sealing plate 121. When the internal pressure of the housing 120 exceeds a predetermined value due to gas generated inside the housing 120, the gas exhaust valve 130 exhausts the gas to the outside of the housing 120. The gas from the gas exhaust valve 130 flows through the gas duct 70 and is exhausted to the outside of the battery module 1.

[0048] Fig. 5 is a cross-sectional view showing a configuration of a case included in a battery module according to an embodiment of the present technology, and Fig. 6 is a perspective view of the case of Fig. 5 as viewed from the direction of arrow VI.

[0049] 5 and 6, case 140 includes a first end 162 and a second end 152 that are aligned and face each other in a second direction (X direction) that is perpendicular to the first direction (Y direction). In this embodiment, first end 162 is located on the inner surface of rear wall 160. In this embodiment, second end 152 is located on the inner surface of front wall 150.

[0050] The first end 162 is provided with a biasing portion 163 and a first tapered portion 164. The second end 152 is provided with a first reference surface 153 and a second tapered portion 155.

[0051] The biasing portion 163 according to this embodiment is a rib that protrudes from the first end portion 162 toward the housing 120 of the battery cell 100. The rib that is the biasing portion 163 is molded integrally with the case 140.

[0052] The first tapered portion 164 extends along the third direction (Z direction). The first tapered portion 164 is provided so as to be continuous with the biasing portion 163. The first tapered portion 164 is inclined toward the front wall portion 150 as it approaches the biasing portion 163.

[0053] The first reference surface 153 is located at the end of a first extending portion 154 that is provided at the second end portion 152 and extends toward the first end portion 162 .

[0054] The second tapered portion 155 extends along the third direction (Z direction). The second tapered portion 155 is provided so as to be continuous with the first reference surface 153. The second tapered portion 155 is inclined toward the rear wall portion 160 as it approaches the first reference surface 153.

[0055] A second reference surface 185 is provided on the top surface 180 of the case 140. Specifically, the top surface 180 has two second extending portions 186L, 186R. The two second extending portions 186L, 186R extend in the Z direction. One second extending portion 186L is disposed on the first end portion 162 side. The other second extending portion 186R is disposed on the second end portion 152 side. One second reference surface 185L is provided on one second extending portion 186L. The other second reference surface 185R is provided on the other second extending portion 186R.

[0056] FIG. 7 is a cross-sectional view showing a configuration of a biasing portion included in a battery module according to an embodiment of the present technology.

[0057] 7, a rib that is an urging portion 163 according to an embodiment of the present technology is inclined at an inclination angle A1 with respect to a first direction (Y direction). The inclination angle A1 of the urging portion 163 is an angle at which a middle line 163c that continuously connects the middle points between a first side edge 163a and a second side edge 163b that constitute the rib is inclined from the first direction (Y direction) in a cross-sectional view of the XY plane.

[0058] By tilting the biasing portion 163 from the first direction (Y direction), it is possible to prevent the biasing portion 163 from buckling and being damaged when the battery cell 100 is inserted into the case 140.

[0059] The inclination angle A1 of the urging portion 163 is inclined at an angle of 20° to 45° with respect to the first direction (Y direction) before the battery cell 100 is inserted into the case 140. The inclination angle A1 of the urging portion 163 is preferably 30°. This makes it possible to prevent cracks from occurring in the urging portion 163 when the urging portion 163 is deformed.

[0060] The urging portion 163 has a tapered shape that widens toward its base. This prevents the urging portion 163 from breaking at its base when the urging portion 163 is deformed by inserting the battery cell 100 into the case 140. In addition, because the urging portion 163 is connected to the rear wall portion 160 at its base by a curved shape R, the urging portion 163 is further prevented from breaking at its base.

[0061] The width W1 of the tip of the urging portion 163 is, for example, 0.25 mm. The width W2, when the curved shape R of the base of the urging portion 163 is not taken into consideration, is, for example, 0.42 mm. The height H in the second direction (X direction) from the rear wall portion 160 to the tip of the urging portion 163 is, for example, 1 mm. The area occupied by the urging portion 163 inside the case 140 can be made as small as possible, while the urging portion 163 can press the battery cell 100 inside the case 140.

[0062] Next, we will explain how to position the battery cell 100 relative to the case 140 when the battery cell 100 is inserted into the case 140. As shown in Figures 5 and 6, the battery cell 100 is inserted into the case 140 along the third direction (Z direction).

[0063] Before the battery cell 100 is inserted, the distance in the second direction (X direction) between the urging portion 163 and the first reference surface 153 is shorter than the length in the second direction (X direction) of the battery cell 100. Therefore, when the battery cell 100 is inserted into the case 140, the urging portion 163 deforms toward the rear wall portion 160. In this embodiment, the tip of the urging portion 163 deforms in the direction of the arrow in FIG.

[0064] 5, as a reaction to the deformation of the urging portion 163 toward the rear wall portion 160, the urging portion 163 presses the battery cell 100 in the second direction (X direction). In other words, the urging portion 163 urges the battery cell 100 toward the second end 152 of the case 140. In this embodiment, the urging portion 163 undergoes plastic deformation when the battery cell 100 is inserted into the case 140.

[0065] Due to this deformation, the biasing portion 163 presses the battery cell 100 with a load of, for example, 80 N to 100 N. The load of the biasing portion 163 is preferably a load that does not exceed the compressive load that the sealing plate 121 of the battery cell 100 can withstand.

[0066] The first reference surface 153 positions the battery cell 100 in the second direction (X direction). The battery cell 100 is urged toward the first reference surface 153 by the urging portion 163, and the battery cell 100 is pressed against the first reference surface 153, so that the battery cell 100 is positioned in the second direction (X direction) relative to the case 140. The battery cell 100 is fixed between the urging portion 163 and the first reference surface 153 because the distance between the urging portion 163 and the first reference surface 153 in the second direction (X direction) before the battery cell 100 is inserted is shorter than the length of the battery cell 100.

[0067] The battery cell 100 inserted into the case 140 abuts against the second reference surface 185. This positions the battery cell 100 in the third direction (Z direction).

[0068] In the battery module 1 according to an embodiment of the present technology, the biasing portion 163 presses the battery cell 100, and the battery cell 100 is pressed against the first reference surface 153 provided on the case 140, thereby positioning the battery cell 100 relative to the case 140 that forms the unit 10 including a plurality of battery cells 100. As a result, when joining a bus bar 40 or the like to the electrode terminal 110 of the battery cell 100 housed in the case 140, no misalignment of the battery cell 100 occurs relative to the case 140, making it easier to join the electrode terminal 110 and the bus bar 40.

[0069] In the battery module 1 according to an embodiment of the present technology, the biasing portion 163 can be plastically deformed to reliably position the battery cell 100 relative to the case 140.

[0070] In a battery module 1 according to one embodiment of the present technology, by inserting the battery cell 100 into the case 140 along the third direction (Z direction), the battery cell 100 can be positioned while being clamped by the case 140 in the second direction (X direction) perpendicular to the insertion direction of the battery cell 100, and therefore the battery cell 100 can be positioned while being fixed to the case 140.

[0071] In a battery module 1 according to one embodiment of the present technology, by providing a first tapered portion 164 and a second tapered portion 155 in the case 140, the battery cell 100 can be inserted into the case 140 along the tapered shape, thereby improving the ease of inserting the battery cell 100 into the case 140.

[0072] In a battery module 1 according to one embodiment of the present technology, the biasing portion 163 is configured as a rib, which allows the battery cell 100 to be biased with a simple configuration, compared to when a spring is used for the biasing portion 163.

[0073] In a battery module 1 according to one embodiment of the present technology, by integrally molding a rib as a biasing portion 163 into the case 140, the number of parts can be reduced without using other parts to press the battery cells 100.

[0074] In a battery module 1 according to one embodiment of the present technology, the inclination angle of the rib that is the biasing portion 163 is set to be greater than or equal to 20° and less than or equal to 45°, thereby making it possible to configure the biasing portion 163 so that it is less likely to be damaged by deformation and so that the biasing portion 163 can easily press against the battery cell 100.

[0075] The biasing portion 163 is not limited to a rib, and may be, for example, a leaf spring. Also, the biasing portion 163 is integrally molded with the case 140, but the case 140 and the biasing portion 163 may be provided separately. Furthermore, the biasing portion 163 is plastically deformed by inserting the battery cell 100 into the case 140, but it may also be deformed only elastically.

[0076] Furthermore, in one embodiment of the present technology, the first end 162 and the second end 152 are located on the inner surface of the case 140, but this configuration is not limited to this. The first end 162 and the second end 152 may be located on another configuration attached to the case 140. Furthermore, the battery cell 100 is configured to be biased in the second direction (X direction) and positioned, but this configuration is not limited to this, and the battery cell 100 may be configured to be biased in a third direction (Z direction) and positioned in the third direction (Z direction).

[0077] Although the embodiments of the present technology have been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present technology is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0078] REFERENCE SIGNS LIST 1 battery module, 10 unit, 20 end plate, 30 restraint member, 40 bus bar, 60 cover member, 70 gas duct, 80 terminal member, 100 battery cell, 110 electrode terminal, 111 positive electrode terminal, 112 negative electrode terminal, 120 housing, 121 sealing plate, 130 gas release valve, 140 case, 150 front wall portion, 151 first duct portion, 152 second end portion, 153 first reference surface, 154 first extension portion, 155 second tapered portion, 160 rear wall portion, 161 second duct portion, 162 first end portion, 163 biasing portion, 163a first side edge, 163b second side edge, 163c intermediate line, 164 first tapered portion, 170 first side wall portion, 171 second side wall portion, 180 Upper surface portion, 181 wall portion, 182 engagement surface, 183 hole portion, 185, 185L, 185R second reference surface, 186L, 186R second extension portion, 300 plate-shaped portion, 310 opening, 320 first flange portion, 330 second flange portion, 420 second bus bar portion, 430 third bus bar portion.

Claims

1. a plurality of battery cells arranged side by side in a first direction, each having a rectangular shape; a plurality of cases that house the plurality of battery cells and support them in at least the first direction, and form a plurality of units each including the plurality of battery cells; the plurality of units are arranged side by side in the first direction, each of the plurality of cases includes a first end and a second end that are aligned and opposed to each other in a second direction that is perpendicular to the first direction; a plurality of biasing portions are provided at the first end of each of the plurality of cases, and each biases each of the plurality of battery cells toward the second end of the case by deforming when each of the plurality of battery cells is inserted; a reference surface for positioning the battery cells in the second direction is provided at the second end of each of the cases.

2. The battery module according to claim 1 , wherein each of the plurality of biasing portions undergoes plastic deformation when each of the plurality of battery cells is inserted into the case.

3. 3. The battery module according to claim 1, wherein each of the plurality of battery cells is inserted into the case along a third direction that is perpendicular to the first direction and the second direction.

4. The battery module according to claim 3 , wherein the tapered portion extending along the third direction is provided so as to be continuous with the biasing portion or the reference surface.

5. 3 . The battery module according to claim 1 , wherein each of the plurality of biasing portions is a rib that protrudes from the first end toward the housing of each of the plurality of battery cells.

6. The battery module according to claim 5 , wherein the rib is integrally formed with the case.

7. The battery module according to claim 5 , wherein the rib is inclined at an angle of 20° to 45° with respect to the first direction.

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