Battery pack
The battery pack design with a varying cover length and shielding structure addresses the issue of substance intrusion, ensuring effective protection against water and dust ingress.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- AESC JAPAN LTD
- Filing Date
- 2025-10-22
- Publication Date
- 2026-05-07
AI Technical Summary
Existing battery packs face challenges in preventing the intrusion of external substances such as water and dust through the gaps between partitions and covers surrounding battery cells.
A battery pack design featuring a housing with a partition wall, a plate covering the battery cell, and a cover bent relative to the plate, where the cover's length is varied to prevent substance intrusion, and a shielding structure is embedded or provided in the gaps to block external substances.
Effectively suppresses the ingress of external substances into the battery pack, enhancing protection and reliability.
Smart Images
Figure JP2025037154_07052026_PF_FP_ABST
Abstract
Description
Battery pack
[0001] The present invention relates to a battery pack.
[0002] In recent years, various battery packs have been developed. A battery pack includes a battery cell and a housing that houses the battery cell.
[0003] Patent Document 1 describes a battery pack. The battery pack includes a plurality of battery cells and a case that houses the plurality of battery cells. The case has a first member that constitutes a lid portion of the case and a second member that constitutes a bottom portion of the case. The first member and the second member each include a first portion and a second portion that sandwich a seal portion provided along a side wall of the case.
[0004] Patent Document 2 describes a sealing structure of a battery pack. The sealing structure includes a side beam and an upper lid.
[0005] Japanese Unexamined Patent Application Publication No. 2023-72919 Chinese Utility Model Patent Specification No. 220138509
[0006] The housing of the battery pack may have a partition that is at least partially located around the battery cell, a plate that covers the battery cell, and a cover that is bent with respect to the plate and at least partially covers the partition. In such a housing, it may be required to suppress the intrusion of external substances such as water and dust into the battery pack through the gap between the partition and the cover that covers the partition.
[0007] An example of the object of the present invention is to suppress the intrusion of external substances into the battery pack through the gap between a partition that is at least partially located around the battery cell and a cover that covers the partition. Other objects of the present invention will become apparent from the description herein.
[0008] One aspect of the present invention is as follows: 1. A battery pack comprising: a battery cell; and a housing for housing the battery cell, wherein the housing has a partition wall at least partially located around the battery cell; a plate covering the battery cell; and a cover bent relative to the plate to at least partially cover the partition wall, wherein the length of one part of the cover is less than the length of the other part of the cover; and the housing has a structure for preventing the intrusion of external substances into the gap between the partition wall and the part of the cover. 2. The battery pack according to 1, wherein the structure shields the gap from the outside of the gap. 3. The battery pack according to 1, wherein the structure is embedded in the gap. 4. The battery pack according to any one of 1 to 3, wherein the part of the cover is bent relative to the corner of the outer circumference of the plate. 5. The battery pack according to any one of 1 to 4, wherein the other part of the cover is bent relative to the straight portion of the outer circumference of the plate. 6. A battery pack according to any one of 1 to 5, wherein the gap between the partition and the other part of the cover is at least partially open. 7. A battery pack according to 1 or 2, wherein the structure covers the gap, and at least a part of the structure has at least one of a bent shape along the partition and a curved shape along the partition.
[0009] According to the above embodiment of the present invention, it is possible to suppress the intrusion of external substances into the battery pack through the gap between a partition wall located at least partially around the battery cell and a cover that covers the partition wall.
[0010] This is a perspective view of a battery pack according to an embodiment. This is an enlarged perspective view of the first recess and its surrounding area in the housing according to an embodiment. This is a cross-sectional view along line A-A in Figure 2. This is a cross-sectional view along line B-B in Figure 2. This is a cross-sectional view along line C-C in Figure 2. This is a diagram showing a modified example of Figure 4. This is a diagram illustrating a shielding body according to another modified example.
[0011] Embodiments and modified examples of the present invention will be described below with reference to the drawings. In all drawings, similar components are denoted by the same reference numerals, and their descriptions are omitted as appropriate.
[0012] Figure 1 is a perspective view of the battery pack 10 according to the embodiment. Figure 2 is an enlarged perspective view of the first recess 202 and its surrounding area in the housing 200 according to the embodiment. Figure 3 is a cross-sectional view along line A-A in Figure 2. Figure 4 is a cross-sectional view along line B-B in Figure 2. Figure 5 is a cross-sectional view along line C-C in Figure 2.
[0013] In this embodiment, the battery pack 10 is mounted in an automobile. Specifically, the battery pack 10 is mounted between the front and rear wheels of the automobile. Hereafter, unless otherwise specified, the battery pack 10 will be described as being mounted in an automobile. However, the battery pack 10 can also be applied to applications other than automobiles.
[0014] Figures 1 to 5 show the X-axis, Y-axis, and Z-axis, respectively, for illustrative purposes. The X-axis indicates the front-to-back direction of the battery pack 10. The Y-axis is one of the directions perpendicular to the X-axis. The Y-axis indicates the left-to-right direction of the battery pack 10. The Z-axis is a direction perpendicular to both the X-axis and Y-axis. The Z-axis indicates the up-to-down direction of the battery pack 10. The directions indicated by the tip of the X-axis arrow, the Y-axis arrow, and the Z-axis arrow indicate the front, left, and up directions of the battery pack 10, respectively. The relationship between the X-axis, Y-axis, and Z-axis and the front-to-back, left-to-right, and up-to-down directions of the battery pack 10 is not limited to this example.
[0015] In this embodiment, the front-to-back, left-to-right, and up-to-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 represent the front-to-back, left-to-right, and up-to-down directions of the vehicle, respectively. The directions indicated by the tip of the X-axis arrow, the Y-axis arrow, and the Z-axis arrow indicate the front, left, and up directions of the vehicle, respectively. However, the relationship between the front-to-back, left-to-right, and up-to-down directions of the battery pack 10 and the front-to-back, left-to-right, and up-to-down directions of the vehicle is not limited to this example.
[0016] Unless otherwise specified, the +X side refers to the side indicated by the tip of the arrow indicating the X axis, and the -X side refers to the opposite side of the side indicated by the tip of the arrow indicating the X axis. Unless otherwise specified, the +Y side refers to the side indicated by the tip of the arrow indicating the Y axis, and the -Y side refers to the opposite side of the side indicated by the tip of the arrow indicating the Y axis. Unless otherwise specified, the +Z side refers to the side indicated by the tip of the arrow indicating the Z axis, and the -Z side refers to the opposite side of the side indicated by the tip of the arrow indicating the Z axis.
[0017] As shown in Figure 1, the battery pack 10 according to this embodiment comprises a plurality of battery modules 100 and a housing 200.
[0018] In the example shown in Figure 1, the battery pack 10 comprises four battery modules 100 arranged in two rows and two columns in the X and Y directions, respectively, and one battery module 100 arranged on the -X side relative to the four battery modules 100. The number and arrangement of the battery modules 100 are not limited to the example shown in Figure 1. In the example shown in Figure 1, each battery module 100 has a plurality of battery cells 102 stacked in the Y direction. In the example shown in Figure 1, each battery cell 102 has a longitudinal direction in the X direction, a short direction in the Z direction, and a thickness direction in the Y direction. In each battery module 100, the plurality of battery cells 102 are electrically connected in series, parallel, or a combination of series and parallel. The number and arrangement of the plurality of battery cells 102 in each battery module 100 are not limited to the example shown in Figure 1.
[0019] Each battery module 100 may have a separate housing for housing multiple battery cells 102, in addition to the housing 200. Specifically, each battery module 100 may be housed in the housing 200 with its multiple battery cells 102 housed in a different housing from the housing 200. Alternatively, each battery module 100 does not need to have a housing for housing multiple battery cells 102. Specifically, the multiple battery cells 102 of each battery module 100 may be directly housed in the housing 200.
[0020] The housing 200 houses multiple battery modules 100. As shown in Figure 1, the housing 200 has a lower plate 210, a side frame 220, and an upper case 230.
[0021] As shown in Figure 1, the lower plate 210 is positioned substantially perpendicular to the Z direction. In the example shown in Figure 1, when viewed from the Z direction, the lower plate 210 has a substantially rectangular shape with a pair of long sides substantially parallel to the X direction and a pair of short sides substantially parallel to the Y direction, with its four corners cut off. In other words, when viewed from the Z direction, the lower plate 210 has a substantially octagonal shape. The shape of the lower plate 210 is not limited to the example shown in Figure 1.
[0022] As shown in Figures 2 to 5, the side frame 220 includes a base frame 222 and a protrusion 224. The base frame 222 is located on the +Z side relative to the outer circumference of the +Z side surface of the lower plate 210, except for the first recess 202 and second recess 204 of the housing 200, which will be described later. The protrusion 224 protrudes from the +Z side surface of the base frame 222 toward the +Z side. As shown in Figures 3 to 5, the outer surface of the base frame 222 toward the Z direction is located further out of the housing 200 in a direction perpendicular to the Z direction than the outer surface of the protrusion 224 toward the Z direction. Therefore, as shown in Figures 3 to 5, a step is formed between the outer circumference of the base frame 222 toward the Z direction and the outer circumference of the protrusion 224 toward the Z direction in a direction perpendicular to the Z direction. Viewed from the Z direction, the side frame 220 surrounds a plurality of battery modules 100 toward the Z direction. Therefore, the side frame 220 is a partition wall that is at least partially located around the multiple battery modules 100 in the Z direction.
[0023] As shown in Figure 2, the upper case 230 includes a base plate 232 and a cover 234.
[0024] The base plate 232 is positioned approximately perpendicular to the Z direction. The base plate 232 is located on the +Z side with respect to the multiple battery modules 100 and the protrusions 224. The portion of the base plate 232 that overlaps with the protrusions 224 in the Z direction is fastened to each other by multiple fasteners 240, with a seal (not shown in Figures 1 to 5) positioned between the +Z side of the protrusions 224 and the -Z side of the base plate 232. In the example shown in Figure 2, each fastener 240 has a bolt. With the portion of the base plate 232 that overlaps with the protrusions 224 in the Z direction fastened to each other, the base plate 232 covers the +Z side portion of the multiple battery modules 100. With the protrusion 224 and the portion of the base plate 232 that overlaps with the protrusion 224 in the Z direction fastened together, the lower plate 210, side frame 220, and upper case 230 define a housing space for accommodating multiple battery modules 100.
[0025] The cover 234 is bent toward the -Z side with respect to the outer circumference of the base plate 232 in the Z direction. Hereafter, unless otherwise specified, the outer circumference of the base plate 232 refers to the outer circumference of the base plate 232 in the Z direction. As shown in Figures 3 to 5, when the protrusion 224 and the portion of the base plate 232 that overlaps with the protrusion 224 in the Z direction are fastened together, the cover 234 covers the outer surface of the protrusion 224 in the Z direction. By covering the outer surface of the protrusion 224 in the Z direction, the cover 234 can prevent the intrusion of external substances such as water and dust into the inside of the battery pack 10 through the gap between the +Z side of the protrusion 224 and the -Z side of the cover 234. In the example shown in Figures 3 to 5, the cover 234 is positioned substantially parallel to the Z direction. However, the cover 234 may be tilted at an angle with respect to the Z direction. In the examples shown in Figures 1 and 2, when viewed from the +Z side, the outer circumference of the base plate 232 and the cover 234 extend substantially along the outer surface of the base frame 222 in the Z direction.
[0026] As shown in Figure 1, the side frame 220 and the upper case 230 define a first recess 202 and a second recess 204. The first recess 202 is recessed so that the corner between the +X side and the -Y side of the lower plate 210 is exposed. In the example shown in Figure 1, when viewed from the Z direction, the first recess 202 has a roughly right-angle shape. However, when viewed from the Z direction, the first recess 202 may have a corner shape at an angle other than a right angle. The second recess 204 is recessed so that the corner between the +X side and the +Y side of the lower plate 210 is exposed. In the example shown in Figure 1, when viewed from the Z direction, the second recess 204 has a roughly right-angle shape. However, when viewed from the Z direction, the second recess 204 may have a corner shape at an angle other than a right angle.
[0027] As shown in Figure 1, an inlet 212 is provided at the corner exposed from the first recess 202 of the lower plate 210. In other words, the first recess 202 makes it possible to create a space for arranging the inlet 212. The inlet 212 is configured to allow coolant to flow from the inlet 212 into a cooling channel provided inside the lower plate 210. As shown in Figure 1, an outlet 214 is provided at the corner exposed from the second recess 204 of the lower plate 210. In other words, the second recess 204 makes it possible to create a space for arranging the outlet 214. The outlet 214 is configured to allow coolant to flow from the cooling channel provided inside the lower plate 210. By flowing coolant from the inlet 212 to the outlet 214 into the cooling channel inside the lower plate 210, multiple battery modules 100 can be cooled.
[0028] The upper case 230 is formed by pressing the cover 234 relative to the base plate 232. In the pressing process, in order to suppress breakage of the portion of the cover 234 that is bent relative to the corner of the outer circumference of the base plate 232, the length in the Z direction of the portion of the cover 234 that is bent relative to the corner of the outer circumference of the base plate 232 may be less than the length in the Z direction of the portion of the cover 234 that is bent relative to the straight portion of the outer circumference of the base plate 232. In particular, the length in the Z direction of the portion of the cover 234 that is bent relative to the concave corner of the outer circumference of the base plate 232 may be less than the length in the Z direction of the portion of the cover 234 that is bent relative to the convex corner of the outer circumference of the base plate 232. Hereafter, unless otherwise specified, the length of each part of the cover 234 refers to the length from the base end of the cover 234 that connects to the outer circumference of the base plate 232 to the tip of the cover 234 that is located away from the outer circumference of the base plate 232. In this embodiment, the cover 234 is arranged substantially parallel to the Z direction from its base to its tip. Therefore, in this embodiment, the length of each part of the cover 234 is the length of each part of the cover 234 in the Z direction.
[0029] Referring to Figures 2 to 5, examples of the portion of the cover 234 that is bent relative to the straight outer edge of the base plate 232, the portion of the cover 234 that is bent relative to the concave corner of the outer edge of the base plate 232, and the portion of the cover 234 that is bent relative to the convex corner of the outer edge of the base plate 232 will be explained.
[0030] In the example shown in Figure 2, the outer circumference of the base plate 232 includes a first straight section 232a, a second straight section 232b, a third straight section 232c, a fourth straight section 232d, a concave corner 232e, a first convex corner 232f, and a second convex corner 232g. The first straight section 232a and the second straight section 232b constitute sides substantially parallel to the Y direction and sides substantially parallel to the X direction of the first recess 202, respectively. The third straight section 232c extends from the -Y side end of the first straight section 232a toward the -X side away from the first recess 202. The fourth straight section 232d extends from the +X side end of the second straight section 232b toward the +Y side away from the first recess 202. The concave corner 232e is located between the first straight section 232a and the second straight section 232b. The first convex corner 232f is located between the first straight section 232a and the third straight section 232c. The second convex corner 232g is located between the second straight section 232b and the fourth straight section 232d. In the example shown in Figure 2, when viewed from the Z direction, the concave corner 232e, the first convex corner 232f, and the second convex corner 232g are approximately right angles. However, when viewed from the Z direction, the concave corner 232e, the first convex corner 232f, and the second convex corner 232g may have angular shapes at angles other than right angles.
[0031] In the example shown in Figure 2, the cover 234 includes a first straight cover 234a, a second straight cover 234b, a third straight cover 234c, a fourth straight cover 234d, a concave corner cover 234e, a first convex corner cover 234f, and a second convex corner cover 234g. The first straight cover 234a, the second straight cover 234b, the third straight cover 234c, the fourth straight cover 234d, the concave corner cover 234e, the first convex corner cover 234f, and the second convex corner cover 234g are bent relative to the first straight section 232a, the second straight section 232b, the third straight section 232c, the fourth straight section 232d, the concave corner section 232e, the first convex corner section 232f, and the second convex corner section 232g, respectively.
[0032] As shown in Figures 3 to 5, the Z-direction length L2 of the concave corner cover 234e and the Z-direction length L3 of the first convex corner cover 234f are less than the Z-direction length L1 of the first straight cover 234a. As shown in Figures 4 and 5, the Z-direction length L2 of the concave corner cover 234e is less than the Z-direction length L3 of the first convex corner cover 234f. The reason is as follows.
[0033] In the press working process for bending the cover 234 relative to the base plate 232, it is necessary to give the bend from the base plate 232 to the cover 234 a certain radius of curvature in order to suppress fracture of the upper case 230 due to the press working. The radius of curvature of the bend from the base plate 232 to the cover 234 needs to be larger in the concave corner cover 234e and the first convex corner cover 234f than in the first straight cover 234a. Therefore, the Z-direction length L2 of the concave corner cover 234e and the Z-direction length L3 of the first convex corner cover 234f are less than the Z-direction length L1 of the first straight cover 234a. Also, the radius of curvature of the bend from the base plate 232 to the cover 234 needs to be larger in the concave corner cover 234e than in the first convex corner cover 234f. Therefore, the length L2 of the concave corner cover 234e in the Z direction is less than the length L3 of the first convex corner cover 234f in the Z direction.
[0034] Figures 3 to 5 show the relationship between the Z-direction length L1 of the first straight cover 234a, the Z-direction length L2 of the concave corner cover 234e, and the Z-direction length L3 of the first convex corner cover 234f. The relationship between these lengths, explained with reference to Figures 3 to 5, is applicable to the general relationship between the lengths of straight covers such as the first straight cover 234a, the second straight cover 234b, the third straight cover 234c, and the fourth straight cover 234d, the lengths of concave corner covers such as the concave corner cover 234e, and the lengths of convex corner covers such as the first convex corner cover 234f and the second convex corner cover 234g.
[0035] As shown in Figures 2 and 4, a shielding body 250 is provided between the concave corner cover 234e and the surrounding portion of the base frame 222 that surrounds the concave corner cover 234e. As shown in Figure 4, the shielding body 250 blocks the gap between the ridge 224 and the concave corner cover 234e from the outside of the gap. Therefore, the shielding body 250 is structured to prevent the intrusion of external substances such as water and dust into the gap between the ridge 224 and the concave corner cover 234e. As described above, in this embodiment, the length L2 in the Z direction of the concave corner cover 234e needs to be relatively short due to the press processing required to bend the cover 234 relative to the base plate 232. In this embodiment, even if the length L2 in the Z direction of the concave corner cover 234e is relatively short, the intrusion of external substances into the battery pack 10 through the gap between the ridge 224 and the concave corner cover 234e can be suppressed by providing the shielding body 250. In the example shown in Figure 4, a gap exists between the side of the concave corner cover 234e on which the shielding body 250 is located and the side of the shielding body 250 on which the concave corner cover 234e is located. This gap allows for a larger dimensional tolerance for both the concave corner cover 234e and the shielding body 250. However, the side of the concave corner cover 234e on which the shielding body 250 is located and the side of the shielding body 250 on which the concave corner cover 234e is located may be in contact with each other.
[0036] The shielding body 250 is not particularly limited as long as it can prevent external substances from entering the inside of the battery pack 10 through the gap between the protrusion 224 and the concave corner cover 234e. The shielding body 250 is, for example, a sheet such as tape that can be adhered to the concave corner cover 234e and the peripheral portion of the base frame 222 that surrounds the concave corner cover 234e. This sheet may be flexible. Alternatively, the shielding body 250 may be a metal plate welded to the concave corner cover 234e and the peripheral portion of the base frame 222 that surrounds the concave corner cover 234e.
[0037] In the example shown in Figure 2, the shielding body 250 is not provided at least partially on the first straight cover 234a, the second straight cover 234b, the third straight cover 234c, the fourth straight cover 234d, the first convex corner cover 234f, and the second convex corner cover 234g. Therefore, the gaps between the ridge 224 and the first straight cover 234a, the gap between the ridge 224 and the second straight cover 234b, the gap between the ridge 224 and the third straight cover 234c, the gap between the ridge 224 and the fourth straight cover 234d, the gap between the ridge 224 and the first convex corner cover 234f, and the gap between the ridge 224 and the second convex corner cover 234g are at least partially open. Therefore, compared to the case where the shielding body 250 is provided over the entire cover 234, the cost of the shielding body 250 and the complexity of the work involved in providing the shielding body 250 can be reduced. For example, if the length L1 in the Z direction of the first straight cover 234a is long enough to prevent external substances from entering the battery pack 10 through the gap between the protrusion 224 and the first straight cover 234a, then even if the shielding body 250 is not provided on the first straight cover 234a, the entry of external substances into the battery pack 10 through the gap between the protrusion 224 and the first straight cover 234a can be suppressed. The same applies to straight covers other than the first straight cover 234a. If the length L3 in the Z direction of the first convex corner cover 234f is not long enough to prevent external substances from entering the battery pack 10 through the gap between the protrusion 224 and the first convex corner cover 234f, then the shielding body 250 may be provided on the first convex corner cover 234f in the same manner as the concave corner cover 234e. The same applies to convex corner covers other than the first convex corner cover 234f. In other words, whether or not to provide a shielding body 250 on the cover 234 is determined according to the length of the cover 234 in the Z direction.
[0038] In the example shown in Figure 2, the shielding body 250 has a central portion 252 and two bent portions 254.
[0039] The central portion 252 is provided in the concave corner cover 234e and in the concave corner portion of the base frame 222 that is recessed substantially along the concave corner cover 234e. The +Z side portion of the central portion 252 covers the gap between the base frame 222 and the concave corner cover 234e. Therefore, the central portion 252 can prevent external substances such as water and dust from entering the gap between the protrusion 224 and the concave corner cover 234e.
[0040] One of the bent portions 254 has a shape that is bent relative to the central portion 252 and is provided along the first straight cover 234a and the outer circumferential surface of the base frame 222 that extends substantially along the first straight cover 234a. Therefore, the bent portion 254 has a bent shape that is bent along the first straight cover 234a and the outer circumferential surface of the base frame 222 that extends substantially along the first straight cover 234a. The bent portion 254 and the outer circumferential surface of the base frame 222 are joined, for example, by welding. Therefore, the side frame 220 and the shielding body 250 can be firmly fixed together.
[0041] The other bent portion 254 has a shape that is bent relative to the central portion 252 and is provided along the second straight cover 234b and the outer circumferential surface of the base frame 222 that extends substantially along the second straight cover 234b. Thus, the bent portion 254 has a bent shape that is bent along the second straight cover 234b and the outer circumferential surface of the base frame 222 that extends substantially along the second straight cover 234b. The bent portion 254 and the outer circumferential surface of the base frame 222 are joined, for example, by welding. Thus, the side frame 220 and the shielding body 250 can be firmly fixed together.
[0042] Each bent portion 254 may be formed by being bent with respect to the central portion 252. For example, by bending sheet metal, the central portion 252 and the two bent portions 254 may be formed. Alternatively, the shielding body 250 may be molded such that each bent portion 254 has a shape bent with respect to the central portion 252. In such molding, without bending each bent portion 254 with respect to the central portion 252, at the time of completion of molding, each bent portion 254 has a shape bent with respect to the central portion 252.
[0043] FIG. 6 is a diagram showing a modified example of FIG. 4.
[0044] As shown in FIG. 6, a filler 260 may be embedded in the gap between the protrusion 224 and the concave corner cover 234e. The filler 260 is, for example, a caulking material. The filler 260 has a structure for preventing the intrusion of external substances into the gap between the protrusion 224 and the concave corner cover 234e. Therefore, even if the length L2 of the concave corner cover 234e in the Z direction is relatively short, by providing the filler 260, it is possible to suppress the intrusion of external substances into the inside of the battery pack 10 through the gap between the protrusion 224 and the concave corner cover 234e.
[0045] FIG. 7 is a diagram for explaining a shielding body 250 according to another modified example. The shielding body 250 according to another modified example is the same as the shielding body 250 according to the embodiment, except for the following points. In FIG. 7, the white circle with a black dot indicating the Z-axis shows that the tip of the arrow of the Z-axis is directed in front of the paper surface.
[0046] As shown in FIG. 7, when viewed from the +Z side, the shielding body 250 may be curved in a substantially arc shape. In the example shown in FIG. 7, the substantially central portion of the arc of the shielding body 250 covers the gap between the base frame 222 and the concave corner cover 234e. One end of the arc of the shielding body 250 has a curved shape along the first linear cover 234a and the outer peripheral surface of the base frame 222 that extends substantially along the first linear cover 234a. The one end of the shielding body 250 and the outer peripheral surface of the base frame 222 are joined by, for example, welding. Therefore, the side frame 220 and the shielding body 250 can be firmly fixed. The other end of the arc of the shielding body 250 has a curved shape along the second linear cover 234b and the outer peripheral surface of the base frame 222 that extends substantially along the second linear cover 234b. The other end of the shielding body 250 and the outer peripheral surface of the base frame 222 are joined by, for example, welding. Therefore, the side frame 220 and the shielding body 250 can be firmly fixed.
[0047] The curvature of the shielding body 250 may be formed by bending a flat sheet metal. Alternatively, the shielding body 250 may be molded so that the shielding body 250 has a curved shape. In such molding, without bending the members constituting the shielding body 250, at the completion of molding, the shielding body 250 has a curved shape.
[0048] As described above, the embodiments and modifications of the present invention have been described with reference to the drawings. These are examples of the present invention, and various configurations other than the above can also be adopted.
[0049] In the embodiment, a first recess 202 is formed to dispose the inlet 212, and a second recess 204 is formed to dispose the outlet 214. However, the recesses corresponding to the first recess 202 and the second recess 204 may be formed for purposes different from the arrangement of the inlet 212 or the outlet 214. For example, the recess may be formed to dispose an electronic component in the space formed by the recess. Alternatively, the recess may be formed to dispose a component of an automobile on which the battery pack 10 is mounted in the space formed by the recess.
[0050] This application claims priority based on Japanese Patent Application No. 2024-192775, filed on November 1, 2024, and incorporates all of its disclosures herein.
[0051] 10 Battery pack, 100 Battery module, 102 Battery cell, 200 Housing, 202 First recess, 204 Second recess, 210 Lower plate, 212 Inlet, 214 Outlet, 220 Side frame, 222 Base frame, 224 Protrusion, 230 Upper case, 232 Base plate, 232a First straight section, 232b Second straight section, 232c Third straight section, 232d Fourth straight section, 232e Concave corner section, 232f First convex corner section, 232g Second convex corner section, 234 Cover, 234a First straight cover, 234b Second straight cover, 234c Third straight cover, 234d Fourth straight cover, 234e Concave corner cover, 234f First convex corner cover, 234g Second convex corner cover, 240 Fastener, 250 Shielding body, 252 central section, 254 folded section, 260 filler material
Claims
1. A battery pack comprising: a battery cell; and a housing for housing the battery cell, wherein the housing has a partition wall at least partially located around the battery cell; a plate covering the battery cell; and a cover bent relative to the plate to at least partially cover the partition wall, wherein the length of one portion of the cover is less than the length of the other portion of the cover; and the housing has a structure for preventing the intrusion of external substances into the gap between the partition wall and the portion of the cover.
2. The battery pack according to claim 1, wherein the structure shields the gap from the outside of the gap.
3. The battery pack according to claim 1, wherein the structure is embedded in the gap.
4. The battery pack according to any one of claims 1 to 3, wherein the portion of the cover is bent relative to the corner of the outer circumference of the plate.
5. The battery pack according to any one of claims 1 to 3, wherein the other portion of the cover is bent relative to the straight portion of the outer circumference of the plate.
6. The battery pack according to any one of claims 1 to 3, wherein the gap between the partition and the other part of the cover is at least partially open.
7. The battery pack according to claim 1 or 2, wherein the structure covers the gap, and at least a portion of the structure has at least one of a bent shape along the partition wall and a curved shape along the partition wall.
Citation Information
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