Battery pack

Abstract

A battery pack (10) includes a battery module (100), a heat-insulating and insulating sheet (400) at least a part of which is freely disposed with respect to the battery module (100), and an upper plate (230) that restricts movement of the at least a part of the heat-insulating and insulating sheet (400).

Description

Technical Field

[0001] This invention relates to a battery pack. Background Technology

[0002] In recent years, various battery packs have been developed. A battery pack includes at least one battery module.

[0003] Patent document 1 describes a battery module. The battery module includes: an electrical isolation plate with holes for welding aluminum strips; and a cover integrally formed with the electrical isolation plate and foldable relative to the electrical isolation plate.

[0004] Patent document 2 describes a battery assembly. The battery assembly includes a battery pack and side plates disposed on both sides of the battery pack and equipped with hooks. An aerogel felt is disposed on the outer side of the battery assembly. A hanging ring is disposed on the upper part of the aerogel felt, and the hanging ring is connected to the hooks on the side plates.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Chinese Utility Model Registration No. 213660570 Specification

[0008] Patent Document 2: Specification of Chinese Utility Model Registration No. 208460835 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] In the event of a battery module malfunction, high-temperature gases or flames may sometimes be generated from the battery module. Additionally, high-voltage electrical components are sometimes located within the battery pack. To protect the components surrounding the battery module from the effects of these gases, flames, or high-voltage electrical components, thermal insulation materials such as heat-insulating sheets are sometimes used. During the manufacturing of battery packs, it is sometimes necessary to improve the workability of installing these thermal insulation materials.

[0011] One example of the object of the present invention is to improve the workability of installing thermal insulation materials. Other objects of the present invention will become apparent from the description herein.

[0012] Technical means to solve the problem

[0013] One aspect of the present invention is described below.

[0014] 1. A battery pack, comprising:

[0015] Battery module;

[0016] Thermal insulation material, at least a portion of which is freely configurable relative to the battery module; and

[0017] A structure that restricts the movement of at least a portion of the thermal insulation material.

[0018] 2. The battery pack according to 1, wherein at least a gap exists between the thermal insulation material and the structure.

[0019] 3. The battery pack according to 1 or 2, wherein the structure at least partially has a frame for housing the battery module.

[0020] 4. The battery pack according to any one of 1 to 3, wherein the thermal insulation material is mounted on a member that at least partially overlaps with the battery module.

[0021] The effects of the invention

[0022] According to the present invention, the workability of installing thermal insulation materials can be improved. Attached Figure Description

[0023] [ Figure 1 [This is a plan view of the battery pack in the embodiment with the top plate removed.]

[0024] [ Figure 2 [ ] is a perspective view of the battery module and its surroundings in the implementation method.

[0025] [ Figure 3 ] is along Figure 2 A cross-sectional view of line AA.

[0026] [ Figure 4 [Illustration 1] is a view of the upper surface of the protrusion in the embodiment.

[0027] [ Figure 5 [ ] is a view of the upper surface of the slit of the fixed piece in the embodiment. Detailed Implementation

[0028] Hereinafter, embodiments of the present invention will be described using the accompanying drawings. In all the drawings, the same reference numerals are used to denote the same components, and descriptions are omitted where appropriate.

[0029] Figure 1 This is a plan view of the battery pack 10 in an embodiment where the upper plate 230 has been removed. Figure 2 This is a perspective view of the battery module 100 and its surroundings according to the implementation method. Figure 3 It is along Figure 2 A cross-sectional view of line AA.

[0030] In this embodiment, the battery pack 10 is mounted in a vehicle. Specifically, the battery pack 10 is mounted between the front and rear wheels of the vehicle. Hereinafter, unless otherwise specified, the description will assume that the battery pack 10 is mounted in a vehicle. However, the battery pack 10 can also be used for applications other than automobiles.

[0031] In the figures, for illustrative purposes, the X, Y, and Z directions are shown. The X direction indicates the front-to-back direction of the battery pack 10. The Y direction is orthogonal to the X direction. The Z direction indicates the left-to-right direction of the battery pack 10. The Z direction is orthogonal to both the X and Y directions. The Z direction indicates the up-and-down direction of the battery pack 10. The arrows pointing to the X, Y, and Z directions indicate the front, left, and up directions of the battery pack 10, respectively. Figure 1 In the diagram, a white circle with a black dot in the Z-direction indicates an arrow pointing in the Z-direction extending from the depths of the paper towards the foreground. Figure 3 In the diagram, a white circle with a black dot in the X direction indicates an arrow pointing in the X direction extending from the depths of the paper toward the foreground. However, the relationship between the X, Y, and Z directions and the front-back, left-right, and up-down directions of the battery pack 10 is not limited to this example.

[0032] In this embodiment, the forward / backward, left / right, and up / down directions of the battery pack 10 are determined by the vehicle on which the battery pack 10 is mounted. The X, Y, and Z directions indicate the forward / backward, left / right, and up / down directions of the vehicle, respectively. Arrows pointing to the X, Y, and Z directions indicate the forward, left, and up directions of the vehicle, respectively. However, the relationship between the forward / backward, left / right, and up / down directions of the battery pack 10 and the forward / backward, left / right, and up / down directions of the vehicle is not limited to this example.

[0033] Hereinafter, as needed, the side indicated by the arrow representing the X direction will be called the +X side, and the opposite side will be called the -X side. Hereinafter, as needed, the side indicated by the arrow representing the Y direction will be called the +Y side, and the opposite side will be called the -Y side. Hereinafter, as needed, the side indicated by the arrow representing the Z direction will be called the +Z side, and the opposite side will be called the -Z side.

[0034] Reference Figure 1 And refer to as needed Figure 2 and Figure 3 The battery pack 10 of the embodiment will be described.

[0035] like Figure 1 As shown, the battery pack 10 includes multiple battery modules 100 and a frame 200.

[0036] exist Figure 1In the example shown, the four battery modules 100 are arranged in 2 rows and 2 columns in the X and Y directions, respectively. The number and arrangement of the battery modules 100 are not limited to [specific configuration details]. Figure 1 The quantity and configuration are shown. For example, the number of battery modules 100 mounted on the battery pack 10 may be only one. Alternatively, the battery pack 10 may include, for example, five or more battery modules 100.

[0037] Each battery module 100 has multiple battery cells (not shown) stacked in a direction perpendicular to the Z direction. The multiple battery cells are electrically connected to each other by series, parallel, or a combination of series and parallel. Figure 1 The battery modules 100 shown depict the shape of the frame housing individual battery cells (not shown). Figure 1 In the example shown, the frame is in the shape of a generally cuboid with a bottom surface, which, when viewed from the Z direction, is in the shape of a generally quadrilateral with a pair of long sides extending in the X direction and another pair of sides extending in the Y direction.

[0038] like Figures 1-3 As shown, the frame 200 has a lower plate 210, side frames 220, an upper plate 230, and a support frame 240. The lower plate 210 and side frames 220 are sometimes collectively referred to as the lower housing. The upper plate 230 is sometimes referred to as the upper housing. The frame 200 houses multiple battery modules 100.

[0039] The lower plate 210 is configured approximately perpendicular to the Z-direction. Multiple battery modules 100 have their surfaces relative to the +Z side of the lower plate 210 located on the +Z side. For example... Figure 1 As shown, the lower plate 210 is a generally rectangular shape having a pair of long sides that are substantially parallel in the X direction and a pair of short sides that are substantially parallel in the Y direction. The shape of the lower plate 210 is not limited to... Figure 1 The example shown.

[0040] The side frame 220 extends circumferentially around the Z-direction from the +Z side of the lower plate 210. Viewed from the Z-direction, the side frame 220 surrounds the area where the multiple battery modules 100 are located.

[0041] The upper plate 230 is located on the +Z side relative to the multiple battery modules 100 and the side frame 220. Viewed from the Z direction, the lower plate 210 and the upper plate 230 have approximately the same shape. Figure 2 and Figure 3In the diagram, the portion of the upper plate 230 surrounding the battery module 100 is selectively shown. The portion of the side frame 220 that overlaps with the upper plate 230 in the Z direction is fastened to each other by fasteners such as bolts (not shown). With the portion of the side frame 220 that overlaps with the upper plate 230 in the Z direction fastened to each other, the lower plate 210, the side frame 220, and the upper plate 230 form a receiving space for accommodating multiple battery modules 100.

[0042] like Figure 1 As shown, viewed from the Z-direction, the support frame 240 extends in a frame shape that at least partially surrounds each battery module 100. The two sides of each battery module 100 in the Y-direction correspond to the support frame 240, and are fastened to each other by fasteners such as bolts (not shown). With the portions of each battery module 100 and the portions of the support frame 240 fastened to each other, each battery module 100 and the frame 200 are mounted together.

[0043] Reference Figure 2 and Figure 3 This section describes the battery module 100 and its surrounding components. (Regarding...) Figure 2 and Figure 3 The description of the battery module 100 shown can be applied to Figure 1 Any one of the multiple battery modules 100 mounted on the battery pack 10 shown. Figure 2 and Figure 3 The X, Y, and Z directions shown do not need to be separated from each other. Figure 1 The X, Y, and Z directions shown are consistent. For example, Figure 2 and Figure 3 The battery module 100 shown can also be used in Figure 2 and Figure 3 The X and Y directions shown are respectively with Figure 1 As shown, the Y and X directions are aligned when mounted on Figure 1 The battery pack 10 shown.

[0044] like Figure 2 and Figure 3 As shown, the battery pack 10 also includes: a bracket 300, a heat-insulating sheet 400, and wiring 500. (As shown...) Figure 2 and Figure 3 As shown, the upper plate 230 includes: a first plate portion 231, a second plate portion 232, a third plate portion 233, a fourth plate portion 234, and a fifth plate portion 235. (As...) Figure 2 As shown, the support 300 includes: a first support portion 310, a second support portion 320 and a third support portion 330.

[0045] like Figure 2 and Figure 3As shown, the first support portion 310 is located on the +Z side relative to the battery module 100. The first support portion 310 is formed as a member that at least partially overlaps with the battery module 100 in the Z direction. Figure 2 In the example shown, the first support portion 310 is configured approximately perpendicular to the Z-direction. The shape and configuration of the first support portion 310 are not limited to... Figure 2 The example shown.

[0046] like Figure 2 As shown, a plurality of protrusions 340 are provided on the +Z side surface of the first support portion 310. Figure 2 In the example shown, two protrusions 340 are provided on the +Y side of the +Z side surface of the first support portion 310. Figure 2 In the example shown, with the two protrusions 340 arranged in the X direction, the wiring 500 extends through both wirings 500 in the X direction. The wiring 500 is, for example, a wiring harness electrically connected to the battery module 100, or a wiring harness electrically connected to an electrical component such as a voltage detection device electrically connected to the battery module 100. Figure 2 In the example shown, with the wiring 500 and each of the protrusions 340 installed together, the wiring is routed along the X direction via two protrusions 340. The number and arrangement of the protrusions 340, or the number and routing of the wiring 500, are not limited to [specific details needed]. Figure 2 The example shown. For example, the number of protrusions 340 may be only one, or it may be more than three. The wiring 500 may be routed not only along the X direction, but also along any direction perpendicular to the Z direction. Two or more wirings 500 may be routed on the +Z side relative to the +Z side of the first support portion 310. The +Z side relative to the +Z side of the first support portion 310 may also replace the wiring 500 or on which electronic components such as printed circuit boards (PCBs) are placed.

[0047] like Figure 2 As shown, the second bracket portion 320 and the third bracket portion 330 are located on the +X side and -X side respectively relative to the battery module 100. Figure 2 As shown, the second support portion 320 and the third support portion 330 extend from the +X side end and the -X side end of the first support portion 310, respectively. Figure 2 In the example shown, the second support portion 320 and the third support portion 330 are arranged substantially perpendicular to the X direction. The shape and arrangement of the second support portion 320 and the third support portion 330 are not limited to... Figure 2 The example shown.

[0048] like Figure 2 and Figure 3As shown, with the first plate portion 231 located at least partially between the first bracket portion 310 and the battery module 100, it is positioned on the +Z side relative to the battery module 100. Figure 2 and Figure 3 In the example shown, the first plate portion 231 is configured approximately perpendicular to the Z-direction. The shape and configuration of the first plate portion 231 are not limited to... Figure 1 The example shown.

[0049] like Figure 2 and Figure 3 As shown, with the second plate portion 232 located at least partially between the second bracket portion 320 and the battery module 100, it is positioned on the +X side relative to the battery module 100. Figure 2 and Figure 3 As shown, the third plate portion 233 is located on the -X side relative to the battery module 100 when the third support portion 330 is at least partially located between the battery module 100 and the third plate portion 233. Figure 2 and Figure 3 In the example shown, the second plate portion 232 and the third plate portion 233 are arranged substantially perpendicular to the X direction. The shape and arrangement of the second plate portion 232 and the third plate portion 233 are not limited to... Figure 1 The example shown.

[0050] like Figure 2 As shown, the fourth plate portion 234 and the fifth plate portion 235 are located on the +Y side and -Y side respectively relative to the battery module 100. Figure 2 In the example shown, the fourth plate portion 234 and the fifth plate portion 235 are arranged substantially perpendicular to the Y direction. The shape and arrangement of the fourth plate portion 234 and the fifth plate portion 235 are not limited to... Figure 2 and Figure 3 The example shown.

[0051] The thermal insulation sheet 400 is a thermal insulation material used for the following purposes: protecting components surrounding the battery module 100 from the effects of relatively high-temperature gases or flames generated by the battery module 100 in the event of an malfunction; and protecting components surrounding the battery module 100 from the effects of high-voltage electrical components in the case of high-voltage electrical components located in the battery pack 10. The thermal insulation sheet 400 has both thermal insulation and electrical insulation properties. The thermal insulation sheet 400 is, for example, an aerogel felt. However, the thermal insulation sheet 400 is not limited to the materials exemplified herein, as long as it is a material capable of protecting components surrounding the battery module 100 from the effects of the gases or flames and the high-voltage electrical components. The thermal insulation sheet 400 is at least partially bendable. Therefore, the thermal insulation sheet 400 can be easily deformed depending on the shape of the location where it is installed. However, the thermal insulation sheet 400 may also be inflexible.

[0052] like Figure 2 and Figure 3 As shown, the thermal insulation sheet 400 includes a fixed sheet portion 410 and an extendable sheet portion 420. For example... Figure 2 and Figure 3 As shown, the portion of the fixing plate 410 relative to the +Z side of the surface of the first bracket 310 on the +Y side is located on the +Z side. Figure 2 and Figure 3 As shown, the lead-out portion 420 extends from the +Y side end of the fixing portion 410 and hangs down from the +Y side end of the fixing portion 410 toward the -Z side. Figure 2 and Figure 3 As shown, the heat-insulating sheet 400 at least partially covers the battery module 100 and the bracket 300 when the portion of the fixed sheet portion 410 relative to the +Z side of the first bracket portion 310 is at least partially located on the +Z side, and the lead-out sheet portion 420 hangs down from the +Y side end of the fixed sheet portion 410 toward the -Z side. Therefore, the heat-insulating sheet 400 can protect the portion of the upper plate 230 located around the battery module 100 from the gas or flame and the high-voltage components.

[0053] like Figure 2 As shown, the fixing plate portion 410 and the first support portion 310 are mounted to each other with multiple protrusions 340 penetrating through the fixing plate portion 410 in the Z direction. Thus, the multiple protrusions 340 form a structure that holds the fixing plate portion 410 in place while the heat insulation sheet 400 at least partially covers the battery module 100 and the support 300. By using the multiple protrusions 340 to hold the fixing plate portion 410 in place, the first support portion 310 and the fixing plate portion 410 can be mounted to each other without the need for adhesive to bond them together. Therefore, the workability of installing the heat insulation sheet 400 is improved compared to using adhesive. Furthermore, without the need for adhesive, damage such as adhesive melting caused by gas or flame generated from the battery module 100 can be eliminated, and peeling of the fixing plate portion 410 from the first support portion 310 due to adhesive damage can be prevented. Therefore, compared to the use of adhesives, even if gas or flame is generated from the battery module 100, the fixing plate portion 410 and the first bracket portion 310 can be easily kept in a state where they are mounted to each other by the multiple protrusions 340.

[0054] In this embodiment, the protrusion 340 for mounting the wiring 500 is formed as a structure for locking the fixing piece 410. Therefore, the structure of the bracket 300 can be simplified compared to having separate structures for mounting the wiring 500 and for locking the fixing piece 410. However, the structure for mounting the wiring 500 and the structure for locking the fixing piece 410 can also be provided separately. The structure for locking the fixing piece 410 is not limited to the protrusion 340 that passes through the fixing piece 410. For example, the structure for locking the fixing piece 410 can be a bolt such as a double-ended bolt that fixes the fixing piece 410 to the first bracket portion 310, or a clamping member that holds the fixing piece 410 in the first bracket portion 310.

[0055] like Figure 2 and Figure 3 As shown, the -Y side of the lead-out plate 420 and the +Y side of the battery module 100 are not mounted to each other. Therefore, the lead-out plate 420 is not constrained by the battery module 100. Thus, the lead-out plate 420 is at least partially freely configurable relative to the battery module 100. Therefore, the lead-out plate 420 can move at least partially freely relative to the battery module 100 as long as it is not restricted by components different from those of the battery module 100.

[0056] like Figure 2 and Figure 3 As shown, with the upper plate 230 at least partially covering the battery module 100 and the bracket 300, the lead-out portion 420 is at least partially located in the gap between the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate portion 234. Thus, the fourth plate portion 234 is configured to restrict the movement of the lead-out portion 420 towards the +Y side. Therefore, by adjusting the distance in the Y direction between the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate portion 234, the permissible sway of the lead-out portion 420 between the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate portion 234 caused by vibrations of the vehicle carrying the battery pack 10 can be adjusted. Furthermore, by restricting the movement of the lead-out sheet 420 using the fourth plate portion 234, the lead-out sheet 420 can be positioned between the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate portion 234 without the need for adhesive to bond the lead-out sheet 420 to the battery module 100 or the fourth plate portion 234. Therefore, the workability of installing the heat insulation sheet 400 is improved compared to the case where adhesive is used.

[0057] exist Figure 2 and Figure 3In the example shown, the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate portion 234 are close enough to restrict the movement of the lead-out piece 420 towards the +Y side, but not close enough to compress the lead-out piece 420 in the Y direction by the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate portion 234. Thus, as... Figure 2 As shown, at least partially, a gap exists between the +Y side surface of the lead-out tab 420 and the -Y side surface of the fourth plate 234. This gap forms a space where air can exist. Therefore, compared to bonding the lead-out tab 420 and the fourth plate 234 together with an adhesive, the fourth plate 234 can be easily insulated from heat by the gap, protecting it from the effects of gases or flames emitted from the battery module 100 toward the fourth plate 234. However, the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate 234 can also approach each other to the extent that the lead-out tab 420 is at least partially compressed in the Y direction by the +Y side surface of the battery module 100 and the -Y side surface of the fourth plate 234.

[0058] The structure for restricting the movement of the lead-out piece 420 towards the +Y side is not limited to the fourth plate 234. The structure for restricting the movement of the lead-out piece 420 towards the +Y side may also be provided separately from the upper plate 230.

[0059] Figure 4 This is a view of the upper surface of the protrusion 340 in the embodiment. Figure 5 This is a view of the upper surface of the slit 430 of the fixing piece 410 in the embodiment. Figure 4 and Figure 5 The X, Y, and Z directions shown do not need to be separated from each other. Figure 2 and Figure 3 The X, Y, and Z directions shown are consistent. For example, Figure 4 and Figure 5 The protrusion 340 and the fixing piece 410 shown can be Figure 4 and Figure 5 The X and Y directions shown are respectively with Figure 2 and Figure 3 The configuration is shown with the Y and X directions aligned.

[0060] like Figure 4 As shown, viewed from the Z direction, protrusion 340 has an approximate "n" shape. Figure 4In the example shown, the protrusion 340 includes a first extension 342, a second extension 344, and a third extension 346. Viewed from the Z direction, the first extension 342 extends in the Y direction. The first extension 342 is configured approximately perpendicular to the X direction. Viewed from the Z direction, the second extension 344 extends from the +Y side end of the first extension 342 toward the +X side. The second extension 344 is configured approximately perpendicular to the Y direction. Viewed from the Z direction, the third extension 346 extends from the -Y side end of the first extension 342 toward the +X side. The third extension 346 is configured approximately perpendicular to the Y direction. Compared to the case where the second extension 344 and the third extension 346 are not additionally provided on the first extension 342, the strength of the protrusion 340 can be improved when the second extension 344 and the third extension 346 are additionally provided on the first extension 342.

[0061] like Figure 5 As shown, the fixing piece 410 defines a slit 430. Viewed from the Z direction, the slit 430 is approximately H-shaped. The slit 430 includes a first slit portion 432, a second slit portion 434, and a third slit portion 436. Viewed from the Z direction, the first slit portion 432 extends in the Y direction. Viewed from the Z direction, the second slit portion 434 branches into a first branch 434a extending from the +Y side end of the first slit portion 432 toward the +X side, and a second branch 434b extending from the +Y side end of the first slit portion 432 toward the -X side. Viewed from the Z direction, the third slit portion 436 branches into a third branch 436a extending from the -Y side end of the first slit portion 432 toward the +X side, and a fourth branch 436b extending from the -Y side end of the first slit portion 432 toward the -X side.

[0062] The protrusion 340 and the fixing piece 410 are interlocked when the first extension 342 passes through the first slit 432 in the Z direction, the second extension 344 passes through the second slit 434 in the Z direction, and the third extension 346 passes through the third slit 436 in the Z direction. The Y-direction dimensions of the first extension 342 and the first slit 432 are designed to be approximately equal. The X-direction dimensions of the second extension 344 and the second slit 434 are designed to be approximately equal. The X-direction dimensions of the third extension 346 and the third slit 436 are designed to be approximately equal. Therefore, when the protrusion 340 and the slit 430 are formed as designed, and the portion between the fourth branch 436b and the second branch 434b of the fixing piece 410 is flipped up along the -X side of the first extension 342 toward the +Z side, the protrusion 340 and the fixing piece 410 are interlocked.

[0063] When the slit 430, viewed from the Z direction, excludes the second branch 434b and the fourth branch 436b and has the same shape as the protrusion 340, the flip-up portion of the part between the second slit 434 and the second slit 434 of the fixing piece 410 becomes larger in the X direction, and the force that holds the protrusion 340 and the fixing piece 410 together sometimes becomes weaker. However, in Figure 4 and Figure 5 In the example shown, the foldable portion of the fixing piece 410 between the second slit portion 434 and the third slit portion 436 can be divided into: the portion between the first branch portion 434a and the third branch portion 436a of the fixing piece 410, and the portion between the second branch portion 434b and the fourth branch portion 436b of the fixing piece 410. Therefore, compared to the case where the slit 430 does not include the second branch portion 434b and the fourth branch portion 436b and has the same shape as the protrusion 340, the force for locking the protrusion 340 and the fixing piece 410 together can be enhanced.

[0064] When the slit 430, viewed from the Z direction, excludes the second branch 434b and the fourth branch 436b and has the same shape as the protrusion 340, if the fixing piece 410 is pulled towards the +X side due to factors such as the tolerances of the protrusion 340 and the fixing piece 410, stress tends to concentrate around the corner between the -X side surface of the first extension 342 of the protrusion 340 and the +Y side surface of the second extension 344, and around the corner between the -X side surface of the first extension 342 of the protrusion 340 and the -Y side surface of the third extension 346, making the fixing piece 410 more prone to breakage. However, in Figure 4 and Figure 5 In the example shown, even if the fixing plate 410 is pulled towards the +X side, the portion between the second branch 434b and the fourth branch 436b of the fixing plate 410 will be flipped up. Therefore, compared to the case where the slit 430 and the protrusion 340 have the same shape when viewed from the Z direction, the fixing plate 410 is less likely to break even when it is pulled towards the +X side.

[0065] exist Figure 4 and Figure 5In the example shown, even if the fixing piece 410 is pulled towards the -X side due to factors such as the tolerances of the protrusion 340 and the fixing piece 410, the portion between the first branch 434a and the third branch 436a of the fixing piece 410 will be flipped up. Therefore, compared to the case where the portion between the first branch 434a and the third branch 436a of the fixing piece 410 is not flipped up, even if the fixing piece 410 is pulled towards the -X side, stress is less likely to concentrate around the +X side end of the second extension 344 and the +X side end of the third extension 346 on the fixing piece 410. As a result, compared to the case where the portion between the first branch 434a and the third branch 436a of the fixing piece 410 is not flipped up, the fixing piece 410 is less likely to break.

[0066] When the slit 430, viewed from the Z direction, excludes the second branch 434b and the fourth branch 436b and has the same shape as the protrusion 340, if the fixing piece 410 is pulled towards the -Y side due to factors such as the tolerances of the protrusion 340 and the fixing piece 410, stress tends to concentrate around the corner between the -X side surface of the first extension 342 and the +Y side surface of the second extension 344 of the protrusion 340, making the fixing piece 410 more prone to breakage. However, in Figure 4 and Figure 5 In the example shown, the second slit portion 434 branches into a first branch portion 434a and a second branch portion 434b. Therefore, even if the fixing piece portion 410 is pulled towards the -Y side, compared to the case where the slit 430 and the protrusion 340 have the same shape when viewed from the Z direction, the stress around the corner between the -X side surface of the first extension 342 of the protrusion 340 and the +Y side surface of the second extension 344 is less likely to concentrate on the fixing piece portion 410. Therefore, compared to the case where the slit 430 and the protrusion 340 have the same shape when viewed from the Z direction, even if the fixing piece portion 410 is pulled towards the -Y side, the fixing piece portion 410 is less likely to break. The same applies when the fixing piece portion 410 is pulled towards the +Y side due to factors such as the tolerances of the protrusion 340 and the fixing piece portion 410.

[0067] The shape of slit 430 is not limited to Figure 5 The example shown. For instance, viewed from the Z direction, slit 430 may also exclude the second branch 434b and the fourth branch 436b, and have a shape substantially the same as that of the protrusion 340. The respective branches of the second slit portion 434 and the third slit portion 436 are not limited to Figure 5 The example shown illustrates this. Viewed from the Z direction, the multiple branches of the second slit 434 can branch in different directions from each other. The same applies to the third slit 436.

[0068] The embodiments of the present invention have been described above with reference to the accompanying drawings, but these are merely examples of the present invention, and various other structures may also be employed.

[0069] This application claims priority based on Japanese Patent Application No. 2024-051251, filed on March 27, 2024, the entire contents of which are incorporated herein by reference.

[0070] Explanation of icon numbers

[0071] 10: Battery Pack

[0072] 100: Battery Module

[0073] 200: Frame

[0074] 210: Lower board

[0075] 220: Side frame

[0076] 230: On the board

[0077] 231: First section

[0078] 232: Second section

[0079] 233: Third Board Section

[0080] 234: Fourth Board Section

[0081] 235: Fifth section

[0082] 240: Supporting Frame

[0083] 300: Bracket

[0084] 310: First support section

[0085] 320: Second support section

[0086] 330: Third support section

[0087] 340: Protrusion

[0088] 342: First Extension

[0089] 344: Second Extension

[0090] 346: Third Extension

[0091] 400: Thermal insulation sheet

[0092] 410: Fixed plate part

[0093] 420: Introduction to the film section

[0094] 430: Slit

[0095] 432: First slit section

[0096] 434: Second slit

[0097] 434a: First Branch

[0098] 434b: Second Branch

[0099] 436: Third slit

[0100] 436a: Third Branch

[0101] 436b: Fourth Branch

[0102] 500: Wiring

Claims

1. A battery pack, comprising: Battery module; Thermal insulation material, at least a portion of which is freely configured relative to the battery module; as well as A structure that restricts the movement of at least a portion of the thermal insulation material.

2. The battery pack according to claim 1, wherein at least a gap exists between the thermal insulation material and the structure.

3. The battery pack according to claim 1 or 2, wherein the structure at least partially has a frame for housing the battery module.

4. The battery pack according to any one of claims 1 to 3, wherein the thermal insulation material is mounted on a member that at least partially overlaps with the battery module.

Images