Battery pack

Abstract

To provide a battery pack capable of improving an impact resistance without accordance with a complication of a structure.SOLUTION: A battery pack comprises: a battery; a battery module having a battery holder holding the battery; and a battery case housing the battery module. The battery module includes: a first outer surface; and a second outer surface that is opposite to the first outer surface. The battery case includes: a first inner surface that is oppositely arranged with the first outer surface, and is warped to the first outer surface side; and a second inner surface that is oppositely arranged to the second outer surface, and is warped to the second outer surface side. The battery module is supported by the first and second inner surfaces by the warping of the first inner surface and the warping of the second inner surface.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present technology relates to battery packs. [Background technology]

[0002] As electronic devices have become widespread, development of batteries as power sources for these devices has progressed. In this case, a battery pack including multiple batteries has been proposed to allow easy and safe handling of the multiple batteries.

[0003] Various studies have been conducted on technologies related to the configuration of battery packs. For example, Patent Document 1 discloses a technology in which an elastic spring is provided between an exterior case and a battery module that houses multiple batteries in order to improve impact resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-273180 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the invention described in Patent Document 1, the elastic spring is provided integrally with the exterior case or the battery module, which makes the mold structure for molding the exterior case or the battery module complex. It is desirable to provide a battery pack that can improve impact resistance without complicating the structure. [Means for solving the problem]

[0006] A battery pack according to an embodiment of the present technology includes a battery module having a battery and a battery holder that holds the battery, and a battery case that houses the battery module. The battery module has a first outer surface and a second outer surface that faces the first outer surface. The battery case has a first inner surface that is disposed opposite the first outer surface and warped toward the first outer surface, and a second inner surface that is disposed opposite the second outer surface and warped toward the second outer surface. The battery module is supported by the first inner surface and the second inner surface by the warping of the first inner surface and the warping of the second inner surface. Effect of the Invention

[0007] In the battery pack according to one embodiment of the present technology, the battery module is supported by the first and second inner surfaces by the warping of the first and second inner surfaces provided on the battery case. As a result, when a large impact such as a drop is applied to the battery pack, the impact is mitigated or absorbed by the warping of at least one of the first and second inner surfaces. As a result, it is possible to protect the battery module from the impact. Meanwhile, in this battery pack, a large impact such as a drop is mitigated or absorbed by the warping of the first and second inner surfaces. In this way, in this battery pack, instead of providing a new component such as an elastic spring, the inner surface of the existing battery case is given the function of mitigating or absorbing the shock. Moreover, only the inner surface of the existing battery case is provided with a warp, and no complicated structure is provided. Therefore, the impact resistance can be improved without complicating the structure. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a perspective configuration example of a battery pack according to an embodiment of the present technology. [Diagram 2] FIG. 2 is a perspective view showing an example of the configuration of the contents of the battery pack of FIG. [Diagram 3] FIG. 3 is a perspective view showing an example of the structure of the battery pack in FIG. [Figure 4] FIG. 4 is a diagram illustrating an example of a cross-sectional configuration of the battery holder in FIG. [Diagram 5] FIG. 5 is a diagram illustrating an example of a cross-sectional configuration of the battery pack in FIG. 1 taken along the line AA. [Figure 6] FIG. 6 is a diagram illustrating an example of a cross-sectional configuration of the battery pack in FIG. 1 as viewed in the direction of the arrow BB. [Figure 7] FIG. 7 is a diagram illustrating an example of a cross-sectional configuration in the direction of the arrow AA in FIG. 1 when a battery module is removed from the battery pack. [Figure 8] FIG. 8 is a diagram illustrating an example of a cross-sectional configuration in the direction of arrow BB when a battery module is removed from the battery pack in FIG. [Figure 9] FIG. 9 is a diagram illustrating an example of a cross-sectional configuration of the battery pack in FIG. 1 as viewed in the direction of the arrow CC. [Figure 10] FIG. 10 is a diagram illustrating an example of a cross-sectional configuration of the battery pack in FIG. 1 as viewed in the direction of the arrow DD. [Figure 11] FIG. 11 is a perspective view illustrating an example of the configuration of the lower case in FIG. [Figure 12] FIG. 12 is a perspective view illustrating an example of the configuration of the upper case in FIG. [Figure 13] FIG. 13 is a diagram for explaining the function of the exterior case in FIG. 1 when the battery pack in FIG. 1 falls to the ground. [Figure 14] FIG. 14 is a diagram illustrating a modification of the cross-sectional configuration example of FIG. [Figure 15] FIG. 15 is a diagram illustrating a modification of the cross-sectional configuration example of FIG. [Figure 16] FIG. 16 is a diagram illustrating a modification of the cross-sectional configuration example of FIG. [Figure 17] FIG. 17 is a diagram illustrating a modification of the cross-sectional configuration example of FIG. [Figure 18] FIG. 18 is a perspective view illustrating a modified example of the battery pack of FIG. [Figure 19] FIG. 19 is a perspective view showing an example of the structure of the battery pack shown in FIG. 18 in an exploded view. [Figure 20] FIG. 20 is a diagram showing an example of the planar configuration of the inner top surface side of the upper case of FIG. [Figure 21]FIG. 21 is a diagram illustrating a modification of the cross-sectional configuration example of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present technology will be described in detail with reference to the drawings. The description will be given in the following order. 1. Embodiment (FIGS. 1 to 13) 1-1.Configuration 1-2.Function 1-3.Effects 2. Variations 2-1. Modification A (Fig. 14, Fig. 15) 2-2. Modification B (Fig. 16, Fig. 17) 2-3. Modification C (Figs. 18 to 20) 2-4. Modification D (Fig. 21)

[0010] <1. Embodiment> First, a battery pack 1 according to an embodiment of the present technology will be described.

[0011] The battery pack 1 described here is a power source equipped with a plurality of batteries, and is applied to various uses such as electronic devices. The uses of the battery pack 1 will be described in detail later. The type of battery is not particularly limited, and may be a primary battery or a secondary battery. The type of secondary battery is not particularly limited, and specifically, may be a lithium ion secondary battery that obtains battery capacity by utilizing the absorption and release of lithium ions. The number of batteries is not particularly limited, and may be set arbitrarily. The following describes the case where the battery is a secondary battery (lithium ion secondary battery). That is, the battery pack 1 described below is a power source equipped with a plurality of secondary batteries.

[0012] [1-1. Configuration] Fig. 1 shows an example of a perspective configuration of a battery pack 1 according to an embodiment of the present technology. Fig. 2 shows an example of a perspective configuration of contents of the battery pack 1. Fig. 3 shows an example of an exploded perspective configuration of the battery pack 1.

[0013] 1 and 2, the battery pack 1 includes an exterior case 10 and a battery module 20 housed in the exterior case 10. The battery module 20 includes a control board 30. The control board 30 is connected to, for example, positive and negative terminals of each battery 40 (described below), and includes circuits that measure the voltage of each battery 40, detect the remaining capacity of each battery 40, and measure the current output from each battery 40 to detect the presence or absence of an overcurrent.

[0014] The exterior case 10 is composed of a lower case 10a and an upper case 10b, for example, as shown in Fig. 3. An opening end 12a of the lower case 10a and an opening end 12b of the upper case 10b are butted against each other to form a storage space for storing the battery module 20. Fig. 3 shows an example in which the storage space for storing the battery module 20 is formed by a space surrounded by the lower case 10a and a space surrounded by the upper case 10b.

[0015] The exterior case 10 has a shape capable of housing a battery module 20. The exterior case 10 (for example, the lower case 10a) is provided with an external terminal 11 connected to a control board 30. A plurality of batteries 40 are connected to the external terminal 11 via the control board 30.

[0016] The exterior case 10 is made of a resin material such as polyethylene (PE), polypropylene (PP), polycarbonate (PC), modified polyphenylene ether (mPPE), polyamide (PA), polybutylene terephthalate (PBT), acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS), polyacetal (POM), etc. The exterior case 10 may be made of a resin material in which a conductive material such as a metal or a conductive filler is dispersed. The resin material in this case may be the above-mentioned resin material.

[0017] The battery module 20 has a plurality of batteries 40 and a plurality of metal tabs 60. The plurality of batteries 40 are electrically connected via the plurality of metal tabs 60. For example, when a portion of the plurality of batteries 40 are connected in series with each other by the plurality of metal tabs 60, and the plurality of batteries 40 connected in series with each other are referred to as a series unit, the plurality of series units are connected in parallel with each other by the plurality of metal tabs 60. Note that the connection of the plurality of batteries 40 is not limited to the above. Each metal tab 60 is, for example, formed of a metallic lead plate.

[0018] As shown in FIG. 4, the battery 40 has a first end surface 40a and a second end surface 40b facing each other, a positive electrode 41 provided on the first end surface 40a, and a negative electrode 42 provided on the second end surface 40b. FIG. 4 shows a cross-sectional configuration example of a plurality of batteries 40 and a battery holder 50 supporting the plurality of batteries 40. The battery 40 has, for example, a cylindrical shape in which the first end surface 40a and the second end surface 40b extend in a direction facing each other, and the first end surface 40a and the second end surface 40b are each circular. The shape of the battery 40 is not limited to a cylindrical shape. The shapes of the first end surface 40a and the second end surface 40b are not limited to a circular shape.

[0019] The positive electrode 41 is made of a metal material. The positive electrode 41 has a protruding shape at the first end face 40a. The negative electrode 42 is made of a metal material. The negative electrode 42 forms a flat surface at the second end face 40b.

[0020] Assume that the multiple batteries 40 are arranged in a two-dimensional direction perpendicular to the longitudinal direction of the batteries 40 (the direction in which the positive electrode 41 and the negative electrode 42 of the batteries 40 face each other). In this case, the first end surface 40a of one battery 40 (first battery) among the multiple batteries 40 provided in the battery pack 1 and the second end surface 40b of another battery 40 (second battery) among the multiple batteries 40 provided in the battery pack 1 are arranged in the same plane. For example, the multiple first end surfaces 40a and the multiple second end surfaces 40b are arranged alternately in the same plane. The multiple metal tabs 60 are arranged so as to face each other across the multiple batteries 40 provided in the battery pack 1 from the longitudinal direction of the batteries 40. The metal tabs 60 are electrically connected to the positive electrode 41 at the first end surface 40a of the first battery and the negative electrode 42 at the second end surface 40b of the second battery.

[0021] In this specification, the "longitudinal direction of battery 40" refers to a direction parallel to the direction in which positive electrode 41 and negative electrode 42 face each other when battery 40 has a columnar shape extending in a direction in which positive electrode 41 and negative electrode 42 face each other. In this specification, the "arrangement direction of battery 40" refers to a direction perpendicular to the direction in which positive electrode 41 and negative electrode 42 face each other when battery 40 has a columnar shape extending in a direction in which positive electrode 41 and negative electrode 42 face each other.

[0022] The battery module 20 further has a battery holder 50 capable of supporting a plurality of batteries 40. The battery holder 50 is composed of a pair of holders 50a and 50b, as shown in Figures 3 and 4, for example. Both holders 50a and 50b have a common structure. Figure 4 shows an example of the cross-sectional structure of holder 50b.

[0023] Each of the holders 50a and 50b has a side plate portion 51, for example, as shown in Fig. 4. The side plate portion 51 of the holder 50a and the side plate portion 51 of the holder 50b are disposed opposite each other in the longitudinal direction of each battery 40. In the holders 50a and 50b, the side plate portion 51 has an opening portion 52 at a position opposite the positive electrode 41 and the negative electrode 42 of each battery 40. Therefore, the positive electrode 41 or the negative electrode 42 is exposed in the opening portion 52.

[0024] As shown in Fig. 4, each of the holders 50a and 50b has a support portion 53 that supports the plurality of batteries 40 in a tiered manner with a predetermined gap therebetween. Fig. 4 illustrates an example in which the support portion 53 is provided to support the plurality of batteries 40 in two tiers, a bottom tier and a top tier. The bottom tier is the layer that is the lowest when the battery pack 1 (battery module 20) is viewed in a direction as shown in Fig. 4. The top tier is the layer that is the highest when the battery pack 1 (battery module 20) is viewed in a direction as shown in Fig. 4.

[0025] One end of the support portion 53 is connected to the side plate portion 51, and the other end of the support portion 53 forms an opening 54. The support portion 53 is provided with a storage portion 55 connected to the openings 52 and 54. A part of the battery 40 is stored in the storage portion 55.

[0026] FIG. 5 shows an example of a cross-sectional configuration of the battery pack 1 in FIG. 1 as viewed in the direction of the arrow AA. FIG. 6 shows an example of a cross-sectional configuration of the battery pack 1 in FIG. 1 as viewed in the direction of the arrow BB. FIG. 7 shows an example of a cross-sectional configuration of the battery pack 1 in FIG. 1 as viewed in the direction of the arrow AA when the battery module 20 is removed from the battery pack 1 in FIG. 1. FIG. 8 shows an example of a cross-sectional configuration of the battery pack 1 in FIG. 1 as viewed in the direction of the arrow BB when the battery module 20 is removed from the battery pack 1 in FIG. 1. FIG. 9 shows an example of a cross-sectional configuration of the battery pack 1 in FIG. 1 as viewed in the direction of the arrow CC. FIG. 10 shows an example of a cross-sectional configuration of the battery pack 1 in FIG. 1 as viewed in the direction of the arrow DD. FIG. 11 shows an example of a perspective configuration of the lower case 10a in FIG. 1. FIG. 12 shows an example of a perspective configuration of the upper case 10b in FIG. 1.

[0027] In the battery module 20, the length in a direction parallel to one arrangement direction of the batteries 40 (for example, the short side direction of the batteries 40 in FIG. 5) is longer than the length in a direction parallel to the longitudinal direction of the batteries 40. Hereinafter, the direction parallel to one arrangement direction of the batteries 40 (for example, the short side direction of the batteries 40 in FIG. 5) will be referred to as the "longitudinal direction of the battery module 20". In addition, the direction parallel to the longitudinal direction of the batteries 40 will be referred to as the "short side direction of the battery module 20". The battery module 20 has a pair of outer surfaces S3, S4 extending in a direction (longitudinal direction of the battery module 20) parallel to one arrangement direction of the batteries 40 (for example, the short side direction of the batteries 40 in FIG. 5). The outer surface S3 corresponds to, for example, the surfaces of the multiple metal tabs 60 arranged in the same plane. The outer surface S4 corresponds to, for example, the surfaces of the multiple metal tabs 60 arranged in the same plane at a position opposite to the outer surface S3 via the multiple batteries 40.

[0028] In the lower case 10a, the length in a direction parallel to the longitudinal direction of the battery module 20 is longer than the length in a direction parallel to the lateral direction of the battery module 20. The lower case 10a is provided with a pair of inner surfaces S1, S2 extending in a direction parallel to the longitudinal direction of the battery module 20 (longitudinal direction of the lower case 10a). The inner surfaces S1, S2 are arranged to sandwich the multiple batteries 40 from the longitudinal direction of the batteries 40. The lower case 10a is further provided with a pair of inner surfaces Sa, Sb extending in a direction parallel to the lateral direction of the battery module 20 (lateral direction of the lower case 10a). The inner surface S1 contacts the inner surfaces Sa, Sb at a corner of the lower case 10a. The inner surface S2 contacts the inner surfaces Sa, Sb at a corner of the lower case 10a.

[0029] The inner surface S1 is provided at a position facing a part of the outer surface S3, and is warped toward the outer surface S3 (inside the lower case 10a). The part of the inner surface S1 that is warped toward the outer surface S3 (inside the lower case 10a) includes a part of the opening end 12a, for example, as shown in Figs. 5, 7, and 11. That is, the opening end 12a is formed with a warp that protrudes toward the outer surface S3 (inside the lower case 10a). The inner surface S1 is formed with a warp that protrudes toward the outer surface S3 (inside the lower case 10a) not only when the battery module 20 is housed in the lower case 10a, as shown in Fig. 5, but also when the battery module 20 is removed from the lower case 10a, as shown in Figs. 7 and 11.

[0030] The inner surface S2 is provided at a position facing a part of the outer surface S4, and is warped toward the outer surface S4 side (inside the lower case 10a). The part of the inner surface S2 warped toward the outer surface S4 side (inside the lower case 10a) includes a part of the opening end 12a, for example, as shown in Figs. 5, 7, and 11. That is, the opening end 12a is formed with a warp protruding toward the outer surface S4 side (inside the lower case 10a). The inner surface S2 is formed with a warp protruding toward the outer surface S4 side (inside the lower case 10a) not only when the battery module 20 is housed in the lower case 10a, as shown in Fig. 5, but also when the battery module 20 is removed from the lower case 10a, as shown in Figs. 7 and 11. Therefore, the battery module 20 is supported (sandwiched) by the inner surface S1 and the inner surface S2, as shown in Fig. 5, for example. The warping of the inner surface S1 and the inner surface S2 can be formed, for example, by generating a shrinkage stress through temperature control when resin molding the lower case 10a.

[0031] In the upper case 10b, the length in a direction parallel to the longitudinal direction of the battery module 20 is longer than the length in a direction parallel to the lateral direction of the battery module 20. The upper case 10b is provided with a pair of inner surfaces S5, S6 extending in a direction parallel to the longitudinal direction of the battery module 20 (longitudinal direction of the upper case 10b). The inner surfaces S5, S6 are arranged to sandwich the plurality of batteries 40 from the longitudinal direction of the batteries 40. The upper case 10b is further provided with a pair of inner surfaces Sc, Sd extending in a direction parallel to the lateral direction of the battery module 20 (lateral direction of the upper case 10b). The inner surface S5 is in contact with the inner surfaces Sc, Sd at a corner of the upper case 10b. The inner surface S6 is in contact with the inner surfaces Sc, Sd at a corner of the upper case 10b.

[0032] The inner surface S5 is provided at a position facing a part of the outer surface S3, and is warped toward the outer surface S3 (inside the upper case 10b). The part of the inner surface S5 that is warped toward the outer surface S3 (inside the upper case 10b) includes the opening end 12b, for example, as shown in Figs. 5, 7, and 11. That is, the opening end 12b is formed with a warp that protrudes toward the outer surface S3 (inside the upper case 10b). The inner surface S5 is formed with a warp that protrudes toward the outer surface S3 (inside the upper case 10b) not only when the battery module 20 is housed in the upper case 10b, as shown in Fig. 5, but also when the battery module 20 is removed from the upper case 10b, as shown in Figs. 7 and 11.

[0033] The inner surface S6 is provided at a position facing a part of the outer surface S4, and is warped toward the outer surface S4 side (inside the upper case 10b). The part of the inner surface S6 warped toward the outer surface S4 side (inside the upper case 10b) includes the opening end 12b, for example, as shown in Figs. 5, 7, and 11. That is, the opening end 12b is formed with a warp protruding toward the outer surface S4 side (inside the upper case 10b). The inner surface S6 is formed with a warp protruding toward the outer surface S4 side (inside the upper case 10b) not only when the battery module 20 is housed in the upper case 10b, as shown in Fig. 5, but also when the battery module 20 is removed from the upper case 10b, as shown in Figs. 7 and 11. Therefore, the battery module 20 is supported (sandwiched) by the warp of the inner surface S5 and the warp of the inner surface S6, as shown in Fig. 5, for example. The warping of the inner surfaces S5 and S6 can be formed, for example, by generating a shrinkage stress through temperature control when upper case 10b is resin-molded.

[0034] The inner surface S1 and the outer surface S3 are in contact with each other with a predetermined pressure due to the warping of the inner surface S1, and a gap G1 is formed around the contact portion P1 between the inner surface S1 and the outer surface S3, separating the inner surface S1 and the outer surface S3. The contact portion P1 is provided, for example, at the opening end 12a. The inner surface S2 and the outer surface S4 are in contact with each other with a predetermined pressure due to the warping of the inner surface S2, and a gap G2 is formed around the contact portion P2 between the inner surface S2 and the outer surface S4, separating the inner surface S2 and the outer surface S4. The contact portion P2 is provided, for example, at the opening end 12a.

[0035] The inner surface S5 and the outer surface S3 are in contact with each other with a predetermined pressure due to the warping of the inner surface S5, and a gap G3 is formed around the contact portion P3 between the inner surface S5 and the outer surface S3, separating the inner surface S5 and the outer surface S3. The contact portion P3 is provided, for example, at the opening end 12b. The inner surface S6 and the outer surface S4 are in contact with each other with a predetermined pressure due to the warping of the inner surface S6, and a gap G4 is formed around the contact portion P4 between the inner surface S6 and the outer surface S4, separating the inner surface S5 and the outer surface S4. The contact portion P4 is provided, for example, at the opening end 12b.

[0036] The contact portion P1 between the inner surface S1 and the outer surface S3 is disposed in a central region R1 of the inner surface S1 excluding both ends of the inner surface S1 when the opening end 12a is viewed in plan. The central region R1 is a region facing the central battery 40 in the arrangement direction of the batteries 40 and the two batteries 40 on both sides of the central battery 40 (i.e., a total of three batteries 40) among the multiple batteries 40 included in the battery module 20 when the opening end 12a is viewed in plan, as shown in FIG. 5, for example. The contact portion P1 is disposed at a position on a center line AX1 connecting the center portion of the inner surface S1 and the center portion of the inner surface S2 when the opening end 12a is viewed in plan, as shown in FIG. 5, for example. The contact portion P1 is disposed at a position on the center line AX1 of the battery module 20, as shown in FIG. 5, for example. Further, for example, as shown in Fig. 5, when the opening end 12a is viewed in plan, the contact portion P1 is disposed at the center portion (position on the center line AX2) of the battery module 20 in the longitudinal direction of the battery module 20. For example, when the opening end 12a is viewed in plan, the contact portion P1 is disposed at the center portion (position on the center line AX2) of the outer surface S3 of the battery module 20. For example, as shown in Fig. 5, the center line AX1 and the center line AX2 may coincide with each other.

[0037] A central portion of the inner surface S1 when opening end 12a is viewed in plan is located at a position of the inner surface S1 when opening end 12a is viewed in plan, equidistant from both ends of the inner surface S1. A central portion of the inner surface S2 when opening end 12a is viewed in plan is located at a position of the inner surface S2 when opening end 12a is viewed in plan, equidistant from both ends of the inner surface S2. A central portion of the battery module 20 in the longitudinal direction when opening end 12a is viewed in plan is located at a position of the battery module 20 in the longitudinal direction when opening end 12a is viewed in plan.

[0038] The contact portion P2 between the inner surface S2 and the outer surface S4 is disposed in a central region R2 of the inner surface S2 excluding both ends of the inner surface S2 when the opening end 12a is viewed in a plan view. The central region R2 is a region that faces the central battery 40 in the arrangement direction of the batteries 40 and the two batteries 40 on both sides of the battery 40 (i.e., a total of three batteries 40) among the multiple batteries 40 included in the battery module 20 when the opening end 12a is viewed in a plan view, as shown in FIG. 5, for example. The contact portion P2 is disposed at a position on the center line AX1 when the opening end 12a is viewed in a plan view, as shown in FIG. 5, for example. The contact portion P2 is further disposed at a central portion (position on the center line AX2) in the longitudinal direction of the battery module 20 when the opening end 12a is viewed in a plan view, as shown in FIG. The contact portion P2 is disposed at a central portion (position on the center line AX2) of the outer surface S4 of the battery module 20 when the opening end 12a is viewed in a plan view, for example. The contact portion P2 is disposed at a central portion (position on the center line AX2) of the outer surface S4 of the battery module 20 when the opening end 12a is viewed in a plan view, as shown in FIG.

[0039] The contact portion P3 between the inner surface S5 and the outer surface S3 is disposed in a central region R3 of the inner surface S5 excluding both ends of the inner surface S5 when the opening end 12b is viewed in plan. The central region R3 is a region that faces the central battery 40 in the arrangement direction of the batteries 40 and the two batteries 40 on both sides of the central battery 40 (i.e., a total of three batteries 40) among the multiple batteries 40 included in the battery module 20 when the opening end 12b is viewed in plan, as shown in FIG. 6, for example. The contact portion P3 is disposed at a position on a center line AX3 that connects the center portion of the inner surface S5 and the center portion of the inner surface S6 when the opening end 12b is viewed in plan, as shown in FIG. 6, for example. The contact portion P3 is disposed at a position on the center line AX3 of the battery module 20, as shown in FIG. 6, for example. Further, for example, as shown in Fig. 6, when the opening end 12b is viewed in plan, the contact portion P3 is disposed at the center portion (position on the center line AX2) of the battery module 20 in the longitudinal direction of the battery module 20. For example, when the opening end 12b is viewed in plan, the contact portion P3 is disposed at the center portion (position on the center line AX2) of the outer surface S3 of the battery module 20. For example, as shown in Fig. 6, the center line AX3 and the center line AX2 may coincide with each other.

[0040] A central portion of inner surface S5 when opening end 12b is viewed in plan is located at a position of inner surface S5 when opening end 12b is viewed in plan, equidistant from both ends of inner surface S5. A central portion of inner surface S6 when opening end 12b is viewed in plan is located at a position of inner surface S6 when opening end 12b is viewed in plan, equidistant from both ends of inner surface S6. A central portion of battery module 20 in the longitudinal direction when opening end 12b is viewed in plan is located at a position of battery module 20 in the longitudinal direction, equidistant from both ends of battery module 20 when opening end 12b is viewed in plan.

[0041] The contact portion P4 between the inner surface S6 and the outer surface S4 is disposed in a central region R4 of the inner surface S6 excluding both ends of the inner surface S6 when the opening end 12b is viewed in plan view. The central region R4 is a region that faces the central battery 40 in the arrangement direction of the batteries 40 and the two batteries 40 on both sides of the central battery 40 (i.e., a total of three batteries 40) among the multiple batteries 40 included in the battery module 20 when the opening end 12b is viewed in plan view, as shown in FIG. 6, for example. The contact portion P4 is disposed at a position on the center line AX3 of the battery module 20 when the opening end 12b is viewed in plan view, as shown in FIG. 6, for example. The contact portion P4 is further disposed at a central portion (position on the center line AX2) in the longitudinal direction of the battery module 20 when the opening end 12b is viewed in plan view, as shown in FIG. 6, for example. The contact portion P4 is disposed in the center portion of the outer surface S4 of the battery module 20 (at a position on the center line AX2) when the open end 12b is viewed in plan, for example.

[0042] The apex T1 of the inner surface S1 is located in the central region R1 when the battery module 20 is removed from the lower case 10a, as shown in FIG. 7, for example. The apex T1 of the inner surface S1 is located at a position on the center line AX1 of the opening end 12a. The apex T2 of the inner surface S2 is located at a position on the center line AX1 of the opening end 12a, as shown in FIG. 7, for example. When the battery module 20 is removed from the lower case 10a, the apex T2 of the inner surface S2 is located at a position on the center line AX1 of the opening end 12a. When the battery module 20 is removed from the lower case 10a, the apex T1 and T2 may be located at positions on the center line AX1 of the opening end 12a, and the distance between the apex T1 and the apex T2 may be the shortest distance between the inner surface S1 and the inner surface S2.

[0043] The apex T1 of the inner surface S1 may correspond to, for example, the contact portion P1 described above. The apex T2 of the inner surface S2 may correspond to, for example, the contact portion P2 described above. In these cases, the apexes T1 and T2 may be provided at a position on the center line AX1 of the opening end 12a, the apex T1 may be in contact with a position on the center line AX2 of the outer surface S3, and the apex T2 may be in contact with a position on the center line AX2 of the outer surface S4.

[0044] The apex T3 of the inner surface S5 is located in the central region R3 when the battery module 20 is removed from the upper case 10b, as shown in FIG. 8, for example. The apex T3 of the inner surface S5 is located at a position on the center line AX3 of the opening end 12b. The apex T4 of the inner surface S6 is located at a position on the center line AX3 of the opening end 12b, as shown in FIG. 8, for example. When the battery module 20 is removed from the upper case 10b, the apex T3 and T4 may be located at positions on the center line AX3 of the opening end 12b, and the distance between the apex T3 and the apex T4 may be the shortest distance between the inner surface S3 and the inner surface S4.

[0045] The apex T3 of the inner surface S5 may correspond to, for example, the contact portion P3 described above. The apex T4 of the inner surface S6 may correspond to, for example, the contact portion P4 described above. In these cases, the apexes T3 and T4 may be provided at a position on the center line AX3 of the opening end 12b, the apex T3 may be in contact with a position on the center line AX2 of the outer surface S4, and the apex T4 may be in contact with a position on the center line AX2 of the outer surface S4.

[0046] For example, as shown in FIG. 9, the gap G1 is wider near the inner bottom surface S7 of the lower case 10a than near the opening end 12a. This is because there is no warp and no contact portion P1 on the inner surface S1 near the inner bottom surface S7 of the lower case 10a. As a result, the outer surface S3 is separated from the lower case 10a (inner surface S1) near the inner bottom surface S7 of the lower case 10a and does not have a contact portion (contact portion P1) with the inner surface S1. For example, as shown in FIG. 9, the gap G2 is wider near the inner bottom surface S7 of the lower case 10a than near the opening end 12a. This is because there is no warp and no contact portion P2 on the inner surface S2 near the inner bottom surface S7 of the lower case 10a. As a result, the outer surface S4 is separated from the lower case 10a (the inner surface S2) near the inner bottom surface S7 of the lower case 10a, and does not have a contact portion (contact portion P2) with the inner surface S2.

[0047] For example, as shown in FIG. 10, the gap G3 is wider near the inner top surface S8 of the upper case 10b than near the opening end 12b. This is because there is no warp and no contact portion P3 on the inner surface S5 near the inner top surface S8 of the upper case 10b. As a result, the outer surface S3 is separated from the upper case 10b (inner surface S5) near the inner top surface S8 of the upper case 10b, and does not have a contact portion (contact portion P3) with the inner surface S5. For example, as shown in FIG. 10, the gap G4 is wider near the inner top surface S8 of the upper case 10b than near the opening end 12b. This is because there is no warp and no contact portion P4 on the inner surface S6 near the inner top surface S8 of the upper case 10b. As a result, the outer surface S4 is separated from the upper case 10b (the inner surface S6) near the inner top surface S8 of the upper case 10b, and does not have a contact portion (contact portion P4) with the inner surface S6.

[0048] [1-2. Function] Next, a description will be given of the function, particularly the impact resistance, of the battery pack 1. Fig. 13 is a diagram for explaining the function of the exterior case 10 when the battery pack 1 is dropped to the ground 100.

[0049] Assume that the battery pack 1 falls and hits the ground 100, and a large impact is applied to the exterior case 10 of the battery pack 1. At this time, the battery module 20 in the battery pack 1 is supported (sandwiched) by the warping of the inner surfaces S1 and S2 of the exterior case 10, and is also supported (sandwiched) by the warping of the inner surfaces S5 and S6, as shown in, for example, Figs. 5 and 6. Furthermore, gaps G1, G2, G3, and G4 are provided between the battery module 20 and the exterior case 10. Therefore, the large impact applied to the exterior case 10 is mitigated or absorbed by the displacement of the warping of the inner surfaces (e.g., the warping of the inner surfaces S2 and S6) close to the ground 100, as shown in, for example, Fig. 13, and is not directly transmitted to the battery module 20 in the battery pack 1. In other words, the warping of the inner surfaces (e.g., the warping of the inner surfaces S2 and S6) of the exterior case 10 functions as a buffer against the impact applied from the outside. As a result, the battery modules 20 in the battery pack 1 are protected from impacts applied from the outside by the warping of the inner surface of the exterior case 10 (for example, the warping of the inner surfaces S2, S6).

[0050] [1-3. Effects] Next, the effects of the battery pack 1 will be described.

[0051] In this embodiment, the battery module 20 is supported by the inner surfaces S1, S2, S5, and S6 of the exterior case 10 due to the warping of the inner surfaces S1, S2, S5, and S6. As a result, when a large impact such as a drop is applied to the battery pack 1, the impact is mitigated or absorbed by the warping of the inner surfaces S1, S2, S5, and S6. As a result, it is possible to protect the battery module 20 from the impact. Meanwhile, in this battery pack 1, a large impact such as a drop is mitigated or absorbed by the warping of the inner surfaces S1, S2, S5, and S6. In this way, in this battery pack 1, instead of providing new parts, the inner surfaces S1, S2, S5, and S6 of the existing exterior case 10 are given the function of mitigating or absorbing the shock. Moreover, only the inner surface of the existing exterior case 10 is provided with a warp, and no complicated structure is provided. Therefore, the impact resistance can be improved without complicating the structure.

[0052] In this embodiment, the inner surface S1 and the outer surface S3 are in contact with each other due to the warping of the inner surface S1, and a gap G1 is formed around the contact portion P1 between the inner surface S1 and the outer surface S3, separating the inner surface S1 and the outer surface S3. The inner surface S2 and the outer surface S4 are in contact with each other due to the warping of the inner surface S2, and a gap G2 is formed around the contact portion P2 between the inner surface S2 and the outer surface S4, separating the inner surface S2 and the outer surface S4. The inner surface S5 and the outer surface S3 are in contact with each other due to the warping of the inner surface S5, and a gap G3 is formed around the contact portion P3 between the inner surface S5 and the outer surface S3, separating the inner surface S5 and the outer surface S3. The inner surface S6 and the outer surface S4 are in contact with each other due to the warping of the inner surface S6, and a gap G4 is formed around the contact portion P4 between the inner surface S6 and the outer surface S4, separating the inner surface S5 and the outer surface S4.

[0053] 13, a large impact applied to the exterior case 10 is mitigated or absorbed by the displacement of the inner surface warp (e.g., the warp of the inner surfaces S2 and S6) close to the ground 100, and the impact is not directly transmitted to the battery module 20 in the battery pack 1. In other words, the inner surface warp (e.g., the warp of the inner surfaces S2 and S6) of the exterior case 10 functions as a buffer against impacts applied from the outside. As a result, the battery module 20 in the battery pack 1 can be protected from impacts applied from the outside by the inner surface warp (e.g., the warp of the inner surfaces S2 and S6) of the exterior case 10.

[0054] In this embodiment, among the inner surfaces S1, S2, S5, and S6, the portions that are warped inward of the exterior case 10 are formed in the portions that include the opening ends 12a and 12b. This allows the inner surfaces S1, S2, S5, and S6 to have a large amount of warping, so that the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0055] In this embodiment, the contact portion P1 between the inner surface S1 and the outer surface S3 is disposed in a central region R1 of the inner surface S1 excluding both ends of the inner surface S1 when the opening end 12a is viewed in a plan view. The contact portion P2 between the inner surface S2 and the outer surface S4 is disposed in a central region R2 of the inner surface S2 excluding both ends of the inner surface S2 when the opening end 12a is viewed in a plan view. The contact portion P3 between the inner surface S5 and the outer surface S3 is disposed in a central region R3 of the inner surface S5 excluding both ends of the inner surface S5 when the opening end 12b is viewed in a plan view. The contact portion P4 between the inner surface S6 and the outer surface S4 is disposed in a central region R4 of the inner surface S6 excluding both ends of the inner surface S6 when the opening end 12b is viewed in a plan view. This allows the warping amount of the inner surfaces S1, S2, S5, and S6 to be increased, so that the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0056] In this embodiment, when the opening end 12a is viewed in plan with the battery module 20 removed from the lower case 10a, the apex T1 of the inner surface S1 and the apex T2 of the inner surface S2 are located on the center line AX1 of the opening end 12a. Furthermore, when the opening end 12b is viewed in plan with the battery module 20 removed from the upper case 10b, the apex T3 of the inner surface S5 and the apex T4 of the inner surface S6 are located on the center line AX3 of the opening end 12b. This allows the warping of the inner surfaces S1, S2, S5, and S6 to be increased, so that the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0057] In this embodiment, when the open end 12a is viewed in plan, the apex T1 of the inner surface S1 and the apex T3 of the inner surface S5 are in contact with the center portion of the outer surface S3 (position on the center line AX2). Furthermore, when the open end 12b is viewed in plan, the apex T2 of the inner surface S2 and the apex T4 of the inner surface S6 are in contact with the center portion of the outer surface S4 (position on the center line AX2). This allows the warping amount of the inner surfaces S1, S2, S5, and S6 to be increased, and further allows the battery module 20 to be supported in a well-balanced manner by the inner surfaces S1, S2, S5, and S6. As a result, the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0058] In this embodiment, the outer surface S3 is separated from the lower case 10a (inner surface S1) near the inner bottom surface S7 of the lower case 10a, and separated from the upper case 10b (inner surface S5) near the inner top surface S8 of the upper case 10b. The outer surface S4 is separated from the lower case 10a (inner surface S2) near the inner bottom surface S7 of the lower case 10a, and separated from the upper case 10b (inner surface S6) near the inner top surface S8 of the upper case 10b. Here, there is almost no warping near the inner bottom surface S7 of the lower case 10a on the inner surface S1, near the inner bottom surface S7 of the upper case 10b on the inner surface S2, near the inner top surface S8 of the upper case 10b on the inner surface S5, and near the inner top surface S8 of the upper case 10b on the inner surface S6, and there is almost no function of mitigating or absorbing shock. However, as described above, the outer surfaces S3 and S4 are separated from these locations and do not receive impacts directly from these locations, thereby protecting the battery module 20 in the battery pack 1 from large external impacts.

[0059] In the present embodiment, the inner surfaces S1 and S2 are arranged to sandwich the multiple batteries 40 in the longitudinal direction of the batteries 40. This makes it possible to protect the positive electrodes 41 and negative electrodes 42, which are parts of the batteries 40 that are vulnerable to shock.

[0060] <2. Modifications> Next, a modification of the battery pack 1 according to the above embodiment will be described.

[0061] (2-1. Variation A) In the above embodiment, the center line AX2 of the battery module 20 may be provided at a position different from the center line AX1, for example, as shown in Figs. 14 and 15. Fig. 14 shows a modified example of the cross-sectional configuration example of Fig. 5. Fig. 15 shows a modified example of the cross-sectional configuration example of Fig. 6. Even in such a case, when the position of the center line AX2 is within the central region R1, the battery module 20 can be supported in a well-balanced manner by the inner surfaces S1, S2, S5, and S6. As a result, the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0062] (2-2. Variation B) In the above embodiment and its modified examples, for example, as shown in Figs. 16 and 17, the inner surfaces Sa, Sb of the lower case 10a and the inner surfaces Sc, Sd of the upper case 10b may also be warped. Fig. 16 shows a modified example of the cross-sectional configuration example of Fig. 5. Fig. 17 shows a modified example of the cross-sectional configuration example of Fig. 6. The inner surfaces Sa, Sc are provided at a position facing the outer surface S12 of the battery module 20. The inner surfaces Sb, Sd are provided at a position facing the outer surface S11 of the battery module 20. The outer surfaces S11, S12 are arranged to sandwich the plurality of batteries 40 from the arrangement direction of the batteries 40.

[0063] In this case, the battery module 20 in the battery pack 1 can be protected even if the battery pack 1 falls from the side of the inner surface Sa of the lower case 10a and the inner surface Sc of the upper case 10b, or from the side of the inner surface Sb of the lower case 10a and the inner surface Sd of the upper case 10b.

[0064] (2-3. Variation C) In the above-described embodiment and its modified examples, the upper case 10b may be in the form of a lid, for example, as shown in Fig. 18, Fig. 19, and Fig. 20. Fig. 18 shows a modified perspective configuration of the battery pack 1. Fig. 19 shows an example of an exploded perspective configuration of the battery pack 1 in Fig. 18. Fig. 20 shows an example of a planar configuration of the inner top surface S8 side of the upper case 10b in Fig. 19.

[0065] In this modification, the space surrounded by the lower case 10a forms a storage space for storing the battery module 20, and the upper case 10b serves to seal the storage space from the outside space. At this time, as shown in FIG. 20, for example, the inner surfaces S5 and S6 of the upper case 10b are not warped as shown in the above embodiment.

[0066] In this modification, the battery module 20 is supported by the inner surfaces S1 and S2 of the exterior case 10 due to the warping of the inner surfaces S1 and S2. As a result, when a large impact such as a drop is applied to the battery pack 1, the impact is mitigated or absorbed by the warping of the inner surfaces S1 and S2. As a result, it is possible to protect the battery module 20 from the impact. Meanwhile, in this battery pack 1, a large impact such as a drop is mitigated or absorbed by the warping of the inner surfaces S1 and S2. In this way, in this battery pack 1, instead of providing a new part, the inner surfaces S1 and S2 of the existing exterior case 10 are given the function of mitigating or absorbing the shock. Moreover, only the inner surface of the existing exterior case 10 is provided with a warp, and no complicated structure is provided. Therefore, the impact resistance can be improved without complicating the structure.

[0067] In this modification, the contact portion P1 between the inner surface S1 and the outer surface S3 is disposed in a central region R1 of the inner surface S1 excluding both ends of the inner surface S1 when the opening end 12a is viewed in plan. The contact portion P2 between the inner surface S2 and the outer surface S4 is disposed in a central region R2 of the inner surface S2 excluding both ends of the inner surface S2 when the opening end 12a is viewed in plan. This allows the amount of warping of the inner surfaces S1 and S2 to be increased, so that the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0068] In this modification, when the open end 12a is viewed in plan with the battery module 20 removed from the lower case 10a, the apex T1 of the inner surface S1 and the apex T2 of the inner surface S2 are located on the center line AX1 of the open end 12a. This allows the inner surfaces S1 and S2 to be warped to a greater extent, so that the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0069] In this modification, when the open end 12a is viewed in plan, the apex T1 of the inner surface S1 is in contact with the center portion of the outer surface S3 (position on the center line AX2). Furthermore, when the open end 12b is viewed in plan, the apex T2 of the inner surface S2 is in contact with the center portion of the outer surface S4 (position on the center line AX2). This allows the amount of warping of the inner surfaces S1 and S2 to be increased, and further allows the battery module 20 to be supported in a well-balanced manner by the inner surfaces S1 and S2. As a result, the battery module 20 in the battery pack 1 can be protected from large external impacts.

[0070] (2-4. Variation D) In the above embodiment and its modified examples, the battery pack 1 may include a cushioning material 70, for example, as shown in FIG. 21. The cushioning material 70 is made of a cushioning material such as sponge. For example, as shown in FIG. 21, the cushioning material 70 is disposed between the outer surface S3 and the inner surface S1, and between the outer surface S4 and the inner surface S2. The cushioning material 70 is provided, for example, to prevent a decrease in reliability due to dimensional variations of the exterior case 10 and the battery module 20. Even in this case, as in the above embodiment, the battery module 20 is held (sandwiched) by at least the inner surfaces S1 and S2 of the inner surfaces S1, S2, S3, and S4 through the cushioning material 70 due to warping of at least the inner surfaces S1 and S2 of the inner surfaces S1, S2, S3, and S4.

[0071] As a result, when a large shock such as a drop is applied to the battery pack 1, the shock is mitigated or absorbed by the warping of at least the inner surfaces S1 and S2 among the inner surfaces S1, S2, S3, and S4. As a result, it is possible to protect the battery module 20 from the shock. Meanwhile, in this battery pack 1, a large shock such as a drop is mitigated or absorbed by the warping of at least the inner surfaces S1 and S2 among the inner surfaces S1, S2, S3, and S4. In this way, in this battery pack 1, instead of providing a new part, at least the inner surfaces S1 and S2 among the inner surfaces S1, S2, S3, and S4 of the existing exterior case 10 are provided with a function of mitigating or absorbing shock. Moreover, only the inner surface of the existing exterior case 10 is provided with a warp, and no complicated structure is provided. Therefore, the shock resistance can be improved without complicating the structure.

[0072] The present technology has been described above using a number of embodiments and their modified examples. However, the present technology is not limited to the aspects described in the above-mentioned embodiments, and various modifications of the present technology are possible.

[0073] Specifically, the battery structure of the secondary battery has been described as being cylindrical (cylinder type), but the battery structure of the secondary battery applied to the battery pack of the present technology is not particularly limited. Specifically, the battery structure of the secondary battery may be rectangular or coin type. In addition, the secondary battery may have a wound structure or another structure such as a laminated structure.

[0074] Although lithium is used as the electrode reactant of the secondary battery, the type of the electrode reactant is not particularly limited. Specifically, the electrode reactant may be other Group 1 elements in the long periodic table such as sodium and potassium, Group 2 elements in the long periodic table such as magnesium and calcium, or other light metals such as aluminum.

[0075] The effects described in this specification are merely examples, and the effects of the present technology are not limited to the effects described in this specification. Therefore, other effects may be obtained with respect to the present technology.

[0076] The present technology can also be configured as follows. <1> a battery module having a battery and a battery holder for holding the battery; an exterior case that houses the battery module; Equipped with The battery module includes: A first outer surface; a second outer surface opposite to the first outer surface; having The outer case is A first inner surface disposed opposite the first outer surface and warped toward the first outer surface; a second inner surface disposed opposite the second outer surface and warped toward the second outer surface; having The battery module is sandwiched between the first inner surface and the second inner surface by the warping of the first inner surface and the warping of the second inner surface. Battery pack. <2> a battery module having a battery and a battery holder for holding the battery; an exterior case that houses the battery module; Equipped with The battery module includes: A first outer surface; a second outer surface opposite to the first outer surface; having The outer case is a first inner surface that is pressed into contact with the first outer surface; a second inner surface that is pressed into contact with the second outer surface; having a contact portion between the first outer surface and the first inner surface is surrounded by a first gap separating the first outer surface and the first inner surface, A contact portion between the second outer surface and the second inner surface is surrounded by a second gap separating the second outer surface and the second inner surface. Battery pack. <3> The outer case is a first case having a first open end; a second case having a second open end; having the first case and the second case are shaped so that a storage space for the battery module can be formed surrounded by the first case and the second case by butting the first opening end and the second opening end against each other, The battery module is disposed in the accommodation space, The first inner surface is a third inner surface formed in a portion of the inner surface of the first case that includes a part of the first open end and that is warped toward the first outer surface; a fourth inner surface formed in a portion of the inner surface of the second case that includes a part of the second opening end and that is warped toward the first outer surface; The present invention relates to a method for manufacturing a computer-implemented ... The second inner surface is a fifth inner surface formed in a portion of the inner surface of the first case that includes a part of the first open end and that is warped toward the second outer surface; a sixth inner surface formed in a portion of the inner surface of the second case that includes a part of the second opening end and that is warped toward the second outer surface; It is composed of <1> or <2> The battery pack according to claim 1 . <4> a first contact portion between the third inner surface and the first outer surface is disposed in a first central region of the third inner surface excluding both ends of the third inner surface when the first opening end is viewed in a plan view; a second contact portion between the fourth inner surface and the first outer surface is disposed in a second central region of the fourth inner surface excluding both ends of the fourth inner surface when the second opening end is viewed in a plan view; a third contact portion between the fifth inner surface and the second outer surface is disposed in a third central region of the fifth inner surface excluding both ends of the fifth inner surface when the first opening end is viewed in a plan view; A fourth contact portion between the sixth inner surface and the second outer surface is disposed in a fourth central region of the sixth inner surface excluding both ends of the sixth inner surface when the second opening end is viewed in a plan view. <3> The battery pack according to claim 1 . <5> when the first opening end is viewed in a plan view with the battery module removed from the exterior case, a vertex of the third inner surface and a vertex of the fifth inner surface are located on a center line of the first opening end, When the second opening end is viewed in a plan view with the battery module removed from the exterior case, a vertex of the fourth inner surface and a vertex of the sixth inner surface are located on a center line of the second opening end. <3> or <4> The battery pack according to claim 1 . <6> When the first opening end is viewed in a plan view, a vertex of the third inner surface and a vertex of the fourth inner surface are in contact with a central portion of the first outer surface, When the second opening end is viewed in a plan view, a vertex of the fifth inner surface and a vertex of the sixth inner surface are in contact with a central portion of the second outer surface. <5> The battery pack according to claim 1 . <7> The outer case is a first case having a first open end; a second case having a second open end; having the first case and the second case are shaped so that a storage space for the battery module can be formed surrounded by the first case and the second case by butting the first opening end and the second opening end against each other, The battery module is disposed in the accommodation space, The first inner surface and the second inner surface are each formed in a portion of the first case that includes a part of the first open end, and are not formed in the second case. <1> The battery pack according to claim 1 . <8> a first contact portion of the first inner surface that contacts the first outer surface is disposed in a first central region of the first inner surface excluding both ends of the first inner surface when the first opening end is viewed in a plan view; A second contact portion of the second inner surface that contacts the second outer surface is disposed in a second central region of the second inner surface excluding both ends of the second inner surface when the first opening end is viewed in a plan view. <7> The battery pack according to claim 1 . <9> when the first opening end is viewed in a plan view with the battery module removed from the exterior case, an apex of the first inner surface is located on a center line of the first opening end, When the second opening end is viewed in a plan view with the battery module removed from the exterior case, an apex of the second inner surface is located on a center line of the second opening end. <8> The battery pack according to claim 1 . <10> When the first open end is viewed in plan, an apex of the first inner surface is in contact with a central portion of the first outer surface, When the second open end is viewed in plan, a vertex of the second inner surface is in contact with a central portion of the second outer surface. <9> The battery pack according to claim 1 . <11> the first outer surface is separated from the first inner surface near an inner bottom surface and an inner top surface of the exterior case, and does not have a contact portion with the first inner surface; The second outer surface is separated from the second inner surface near an inner bottom surface and an inner top surface of the exterior case, and does not have a contact portion with the second inner surface. <1> Or <10> 13. The battery pack according to claim 12, <12> The battery is in a columnar shape, The battery module includes a plurality of the batteries arranged side by side in a two-dimensional direction perpendicular to a longitudinal direction of the batteries, The first inner surface and the second inner surface are disposed to sandwich the plurality of batteries from the longitudinal direction of the batteries. <1> Or <11> 13. The battery pack according to claim 12, [Explanation of symbols]

[0077] 1...battery pack, 10...outer case, 10a...lower case, 10b...upper case, 11...external terminal, 12a, 12b...opening end, 20...battery module, 30...control board, 40...battery, 40a...first end face, 40b...second end face, 41...positive electrode, 42...negative electrode, 50...battery holder, 50a, 50b...holder, 51...side plate portion, 52...opening, 53...support portion, 54...opening, 55...accommodation part, 60...metal tab, 70...buffer material, 100...ground, AX1,AX2,AX3...center line, G1,G2...gap, P1,P2,P3,P4...contact part, R1,R2,R3, R4...central area, S1, S2, S5, S6, Sa, Sb, Sc, Sd...inner surface, S3, S4, S11, S12...outer surface, S7...inner bottom surface, S8...inner top surface, T1, T2, T3, T4... vertex.

Claims

1. a battery module having a battery and a battery holder for holding the battery; an exterior case that houses the battery module; Equipped with The battery module includes: A first outer surface; a second outer surface opposite to the first outer surface; having The outer case is a first inner surface disposed opposite the first outer surface and warped toward the first outer surface; a second inner surface disposed opposite the second outer surface and warped toward the second outer surface; having The battery module is sandwiched between the first inner surface and the second inner surface by the warping of the first inner surface and the warping of the second inner surface. Battery pack.

2. a battery module having a battery and a battery holder for holding the battery; an exterior case that houses the battery module; Equipped with The battery module includes: A first outer surface; a second outer surface opposite to the first outer surface; having The outer case is a first inner surface that is pressed into contact with the first outer surface; a second inner surface that is pressed into contact with the second outer surface; having a contact portion between the first outer surface and the first inner surface is surrounded by a first gap separating the first outer surface and the first inner surface, A contact portion between the second outer surface and the second inner surface is surrounded by a second gap separating the second outer surface and the second inner surface. Battery pack.

3. The outer case is a first case having a first open end; a second case having a second open end; and having the first case and the second case are shaped so that a storage space for the battery module can be formed surrounded by the first case and the second case by butting the first open end and the second open end against each other; The battery module is disposed in the accommodation space, The first inner surface is a third inner surface formed in a portion of the inner surface of the first case that includes a part of the first open end and that is warped toward the first outer surface; a fourth inner surface formed in a portion of the inner surface of the second case that includes a part of the second opening end and that is warped toward the first outer surface; The present invention relates to a method for manufacturing a computer-implemented ... The second inner surface is a fifth inner surface formed in a portion of the inner surface of the first case that includes a part of the first open end and that is warped toward the second outer surface; a sixth inner surface formed in a portion of the inner surface of the second case that includes a part of the second opening end and that is warped toward the second outer surface; It is composed of The battery pack according to claim 1 .

4. a first contact portion between the third inner surface and the first outer surface is disposed in a first central region of the third inner surface excluding both ends of the third inner surface when the first opening end is viewed in a plan view; a second contact portion between the fourth inner surface and the first outer surface is disposed in a second central region of the fourth inner surface excluding both ends of the fourth inner surface when the second opening end is viewed in a plan view; a third contact portion between the fifth inner surface and the second outer surface is disposed in a third central region of the fifth inner surface excluding both ends of the fifth inner surface when the first opening end is viewed in a plan view; A fourth contact portion between the sixth inner surface and the second outer surface is disposed in a fourth central region of the sixth inner surface excluding both ends of the sixth inner surface when the second opening end is viewed in a plan view. The battery pack according to claim 3 .

5. when the first opening end is viewed in a plan view with the battery module removed from the exterior case, a vertex of the third inner surface and a vertex of the fifth inner surface are provided on a center line of the first opening end, When the second opening end is viewed in a plan view with the battery module removed from the exterior case, a vertex of the fourth inner surface and a vertex of the sixth inner surface are provided on a center line of the second opening end. The battery pack according to claim 3 .

6. When the first opening end is viewed in a plan view, a vertex of the third inner surface and a vertex of the fourth inner surface are in contact with a central portion of the first outer surface, When the second opening end is viewed in a plan view, a vertex of the fifth inner surface and a vertex of the sixth inner surface are in contact with a central portion of the second outer surface. The battery pack according to claim 5 .

7. The outer case is a first case having a first open end; a second case having a second open end; and having the first case and the second case are shaped so that a storage space for the battery module can be formed surrounded by the first case and the second case by butting the first open end and the second open end against each other; The battery module is disposed in the accommodation space, The first inner surface and the second inner surface are each formed in a portion of the first case that includes a part of the first open end, and are not formed in the second case. The battery pack according to claim 1 .

8. a first contact portion of the first inner surface that contacts the first outer surface is disposed in a first central region of the first inner surface excluding both ends of the first inner surface when the first opening end is viewed in a plan view; A second contact portion of the second inner surface that contacts the second outer surface is disposed in a second central region of the second inner surface excluding both ends of the second inner surface when the first opening end is viewed in a plan view. The battery pack according to claim 7.

9. when the first opening end is viewed in a plan view with the battery module removed from the exterior case, an apex of the first inner surface is provided on a center line of the first opening end, When the second opening end is viewed from above with the battery module removed from the exterior case, an apex of the second inner surface is provided on a center line of the second opening end. The battery pack according to claim 8.

10. When the first open end is viewed in plan, an apex of the first inner surface is in contact with a central portion of the first outer surface, When the second open end is viewed in plan, a vertex of the second inner surface is in contact with a central portion of the second outer surface. The battery pack according to claim 9.

11. the first outer surface is separated from the first inner surface near an inner bottom surface and an inner top surface of the exterior case, and does not have a contact portion with the first inner surface; The second outer surface is separated from the second inner surface near an inner bottom surface and an inner top surface of the exterior case, and does not have a contact portion with the second inner surface. The battery pack according to claim 1 or 2.

12. The battery is in a columnar shape, The battery module includes a plurality of the batteries arranged side by side in a two-dimensional direction perpendicular to a longitudinal direction of the batteries, The first inner surface and the second inner surface are disposed to sandwich the plurality of batteries from the longitudinal direction of the batteries. The battery pack according to claim 1 or 2.

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