Battery cover, battery cover precursor, and battery cover assembly method
The battery cover design addresses the need for fewer components and better heat insulation by using interlocking lid wall portions that engage directly, reducing the number of parts and minimizing heat flow.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- 3M INNOVATIVE PROPERTIES CO
- Filing Date
- 2022-03-18
- Publication Date
- 2026-05-22
AI Technical Summary
Conventional battery covers require additional components like fasteners or adhesives to maintain the lid wall in a closed state, increasing the number of parts and allowing heat to flow through gaps between the lid and side walls.
A battery cover design featuring interlocking lid wall portions that engage directly with each other, reducing the need for separate fasteners or adhesives, and incorporating foldable walls to minimize gaps and enhance heat insulation.
The design achieves a reduction in components while improving heat insulation by eliminating the need for additional fasteners or adhesives and minimizing gaps between wall portions.
Smart Images
Figure 0007863989000001 
Figure 0007863989000002 
Figure 0007863989000003
Abstract
Description
Technical Field
[0001] The present invention relates to a battery cover, a precursor of the battery cover, and a method for assembling the battery cover.
Background Art
[0002] As a conventional battery cover, the one described in Patent Document 1 is known. This battery cover has a side wall portion surrounding the four sides of the battery and a lid wall portion covering the upper surface of the battery. The lid wall portion is fixed by a fastener in a state of covering the upper surface of the battery.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the battery cover as described above, the lid wall portion could not be fixed in a closed state without using a separate member such as a fastener. Therefore, there has been a demand for a battery cover that can reduce the number of components and can close the lid wall portion without necessarily using a separate member such as a fastener or an adhesive. Further, in the battery cover as described above, there is a problem that heat flows in from the gap between the lid wall portion and the side wall portion. On the other hand, increasing the fasteners or adhesives to block the gap causes a problem of increasing the number of parts.
[0005] Therefore, an object of the present invention is to provide a battery cover, a precursor of the battery cover, and a method for assembling the battery cover that can reduce the number of components while improving heat insulation.
Means for Solving the Problems
[0006] A battery cover according to one aspect of the present invention is a battery cover that covers a battery and is created by assembling a plurality of wall portions, comprising: a first side wall portion and a second side wall portion that face each other in a first direction when assembled; a third side wall portion and a fourth side wall portion that face each other in a second direction perpendicular to the first direction between the first side wall portion and the second side wall portion when assembled; and a first lid wall portion, a second lid wall portion and a third lid wall portion that are foldable and fixed to each of the ends of the first side wall portion, the second side wall portion and the third side wall portion in a third direction perpendicular to the first and second directions, wherein the first lid wall portion and the third lid wall portion each have engaging portions that directly engage with each other when assembled, and the second lid wall portion is held by the third lid wall portion when assembled.
[0007] A precursor of a battery cover according to one aspect of the present invention is the precursor of a battery cover described above, wherein the first side wall portion, the second side wall portion, the third side wall portion, and the fourth side wall portion are fixed so as to be bendable toward each other so as to form an annular shape when viewed from a third direction, and each of the first side wall portion, the second side wall portion, the third side wall portion, the fourth side wall portion, the first lid wall portion, the second lid wall portion, and the third lid wall portion spreads out toward each other in a flat plate shape or overlaps toward each other.
[0008] A method for assembling a battery cover according to one aspect of the present invention is a method for assembling the above-described battery cover, comprising: a first step of arranging a precursor of the battery cover such that a first side wall portion and a second side wall portion face each other in a first direction, and a third side wall portion and a fourth side wall portion face each other in a second direction; a second step of bending a first lid wall portion relative to the first side wall portion; a third step of bending a third lid wall portion relative to the third side wall portion to engage with the first lid wall portion; and a fourth step of bending a second lid wall portion relative to the second side wall portion to hold it with the third lid wall portion. [Effects of the Invention]
[0009] According to the present invention, it is possible to provide a battery cover that can reduce the number of components, a precursor for the battery cover, and a method for assembling the battery cover. [Brief explanation of the drawing]
[0010] [Figure 1] This is a perspective view showing the battery cover in an intermediate assembly state. [Figure 2] This is a perspective view showing the battery cover in its assembled state. [Figure 3] This is a perspective view showing the battery cover in its assembled state. [Figure 4] This is a schematic plan view illustrating the state of the lid wall during assembly. [Figure 5] This is a schematic plan view illustrating the state of the lid wall during assembly. [Figure 6] This is a schematic plan view illustrating the state of the lid wall during assembly. [Figure 7] This is a cross-sectional view of the plate-like members that make up each wall of the battery cover. [Figure 8] This is a cross-sectional view near the opening. [Figure 9] This is a diagram showing a precursor to the battery cover. [Modes for carrying out the invention]
[0011] Embodiments of the present invention will be described in detail below with reference to the drawings.
[0012] Figures 1 to 3 are perspective views showing a battery cover 1 according to an embodiment of the present invention. Figure 1 is a perspective view showing the battery cover 1 in an intermediate assembly state. Figures 2 and 3 are perspective views showing the battery cover 1 in a completed assembly state. The battery cover 1 is created by assembling a plurality of wall sections. The battery cover 1 is created by assembling a precursor 100 of the battery cover 1. The battery cover 1 is a component that covers the battery. In the following description, XYZ coordinates will be used for explanation. The X-axis direction (first direction) is an arbitrarily set direction. The Y-axis direction (second direction) is a direction perpendicular to the X-axis direction. The Z-axis direction (third direction) is a direction perpendicular to both the X-axis direction and the Y-axis direction.
[0013] As shown in Figure 1, the battery cover 1 comprises a first side wall portion 2A, a second side wall portion 2B, a third side wall portion 2C, and a fourth side wall portion 2D. The first side wall portion 2A and the second side wall portion 2B face each other in the X-axis direction when assembled. The first side wall portion 2A is positioned on the negative side in the X-axis direction. The second side wall portion 2B is positioned on the positive side in the X-axis direction. The third side wall portion 2C and the fourth side wall portion 2D face each other in the Y-axis direction when assembled. The third side wall portion 2C is positioned on the negative side in the Y-axis direction. The fourth side wall portion 2D is positioned on the positive side in the Y-axis direction. Each side wall portion 2A, 2B, 2C, and 2D is approximately rectangular in shape. The Y-axis length of side wall portions 2A and 2B is longer than the X-axis length of side wall portions 2C and 2D.
[0014] The negative end of the first side wall portion 2A in the Y-axis direction and the negative end of the third side wall portion 2C in the X-axis direction are fixedly connected at the fold line portion 4A so as to be foldable, and are folded perpendicular to each other during assembly. The positive end of the first side wall portion 2A in the Y-axis direction and the negative end of the fourth side wall portion 2D in the X-axis direction are fixedly connected at the fold line portion 4B so as to be foldable, and are folded perpendicular to each other during assembly. The negative end of the second side wall portion 2B in the Y-axis direction and the positive end of the third side wall portion 2C in the X-axis direction are fixedly connected at the fold line portion 4C so as to be foldable, and are folded perpendicular to each other during assembly. The positive end of the second side wall portion 2B in the Y-axis direction and the positive end of the fourth side wall portion 2D in the X-axis direction are fixedly connected at the fold line portion 4D so as to be foldable, and are folded perpendicular to each other during assembly.
[0015] During assembly, the negative ends of the side wall portions 2A, 2B, 2C, and 2D in the Z-axis direction are arranged at the same position in the Z-axis direction. Steps are formed at the positive ends of the third side wall portion 2C and the fourth side wall portion 2D in the Z-axis direction. Therefore, among the positive ends of the third side wall portion 2C and the fourth side wall portion D in the Z-axis direction, the positive region E1 in the X-axis direction is arranged on the positive side in the Z-axis direction than the negative region E2 in the X-axis direction. The positive end of the first side wall portion 2A in the Z-axis direction is arranged at the same position as the positive end of the region E1 of the side wall portions 2C and 2D in the Z-axis direction. The positive end of the second side wall portion 2B in the Z-axis direction is arranged at the same position as the positive end of the region E2 of the side wall portions 2C and 2D in the Z-axis direction.
[0016] Further, the battery cover 1 includes a first lid wall portion 3A, a second lid wall portion 3B, a third lid wall portion 3C, and a fourth lid wall portion 3D that are fixedly connected to the positive ends of the first side wall portion 2A, the second side wall portion 2B, the third side wall portion 2C, and the fourth side wall portion 2D in the Z-axis direction so as to be foldable.
[0017] The positive end of the first side wall 2A in the Z-axis direction and the negative end of the first lid wall 3A in the Z-axis direction are fixed at a fold line 5A so as to be bendable, and are bent so as to be perpendicular to each other during assembly (see Figure 2). The positive end of the second side wall 2B in the Z-axis direction and the negative end of the second lid wall 3B in the Z-axis direction are fixed at a fold line 5Ba so as to be bendable, and are bent so as to be inclined to each other during assembly (see Figure 2). The second lid wall 3B has a fold line 5Bb, and when assembled, it folds at this fold line 5Bb so that the second lid wall 3B is positioned perpendicular to the second side wall 2B. The positive end of the third side wall 2C in the Z-axis direction and the negative end of the third lid wall 3C in the Z-axis direction are fixed at a fold line 5C so as to be bendable, and are bent so as to be perpendicular to each other during assembly (see Figure 2). The positive end of the fourth side wall portion 2D in the Z-axis direction and the negative end of the fourth lid wall portion 3D in the Z-axis direction are fixed at the fold portion 5D so as to be foldable, and are folded perpendicular to each other during assembly (see Figure 2).
[0018] Next, the shapes of each lid wall portion 3A, 3B, 3C, and 3D will be described. Unless otherwise specified, the shapes of each lid wall portion 3A, 3B, 3C, and 3D will be described based on the state before folding as shown in Figure 1. The first lid wall portion 3A has a rectangular main body portion 7 extending from the first side wall portion 2A toward the positive side in the Z-axis direction, and a rectangular projection piece 8 extending from the main body portion 7 toward the positive side in the Z-axis direction. The length of the main body portion 7 in the Y-axis direction is approximately the same as the length of the first side wall portion in the Y-axis direction. The length of the main body portion 7 in the Z-axis direction is approximately the same as the length of the region E1 of the side wall portions 2C and 2D in the X-axis direction. The projection piece 8 is positioned at the central position of the main body portion 7 in the Y-axis direction.
[0019] The first lid wall portion 3A has a pair of rectangular openings 9 in the main body portion 7. The pair of openings 9 are arranged to be spaced apart from each other in the Y-axis direction. The pair of openings 9 extend such that the X-axis direction is the longitudinal direction. Also, at the negative-side end in the Y-axis direction of the opening 9 on the negative side in the Y-axis direction and at the positive-side end in the Y-axis direction of the opening 9 on the positive side in the Y-axis direction, widened portions 9a that are locally widened are formed. These openings 9 function as engaging portions 10 for directly engaging with the lid wall portions 3C and 3D during assembly.
[0020] The third lid wall portion 3C has a trapezoidal shape that extends in the positive Z-axis direction from the region E1 of the first side wall portion 2A. The positive-side end of the third lid wall portion 3C in the X-axis direction extends linearly in the positive Z-axis direction. The negative-side end of the third lid wall portion 3C in the Z-axis direction has the same size in the X-axis direction as the region E1. At the negative-side end of the third lid wall portion 3C in the X-axis direction, an inclined edge portion 11 that slopes toward the positive X-axis direction as it goes toward the positive Z-axis direction is formed. The inclined edge portion 11 is arranged to be inclined with respect to the Y-axis direction during assembly (see FIG. 2). At the positive-side end of the third lid wall portion 3C in the Z-axis direction, a widened portion 12 that is locally widened is formed. This widened portion 12 functions as an engaging portion 10 for directly engaging with the first lid wall portion 3A during assembly. Note that the fourth lid wall portion 3D has the same shape as the third lid wall portion 3C.
[0021] The second lid wall portion 3B has a rectangular main body portion 16 that extends in the positive Z-axis direction from the second side wall portion 2B, and substantially rectangular protruding pieces 17A and 17B that extend from both sides of the main body portion 16 in the Y-axis direction. The length of the main body portion 16 in the Y-axis direction is substantially the same as the length of the protruding piece 8 of the first lid wall portion 3A in the Y-axis direction. The main body portion 16 is arranged at the central position in the Y-axis direction of the second side wall portion 2B. In the main body portion 16, a fold line portion 5Bb is formed at a position spaced apart from the fold line portion 5Ba in the positive Z-axis direction. The protruding pieces 17A and 17B are arranged at the ends of the main body portion 16 in the Z-axis direction and protrude toward the negative side and the positive side in the Y-axis direction, respectively.
[0022] Next, with reference to Figures 4 to 6, the states of the lid wall sections 3A, 3B, 3C, and 3D during assembly will be described. Figure 4 shows the first lid wall section 3A in a folded state, with the other lid wall sections 3B, 3C, and 3D omitted. Figure 5 shows the lid wall sections 3C and 3D in a further folded state, with the second lid wall section 3B omitted. Figure 6 shows the second lid wall section 3B in a further folded state.
[0023] As shown in Figure 4, the first lid wall portion 3A is folded vertically at the fold portion 5A so that the first lid wall portion 3A is positioned to spread parallel to the XY plane. As shown in Figure 5, the lid wall portions 3C and 3D are folded vertically at the fold portions 5C and 5D so that the lid wall portions 3C and 3D are positioned to spread parallel to the XY plane. At this time, the lid wall portions 3C and 3D are positioned to overlap the first lid wall portion 3A from the positive side in the Z-axis direction. In addition, both ends of the wide portion 12 of the lid wall portions 3C and 3D in the X-axis direction are inserted into the respective openings 9. As a result, the first lid wall portion 3A and the lid wall portions 3C and 3D directly engage with each other via the engaging portion 10 during assembly. The state of direct engagement means that the lid wall portions 3A, 3C, and 3D are connected to each other using only the shapes of the lid wall portions 3A, 3C, and 3D, without using any other components such as fasteners or adhesives.
[0024] As shown in Figure 6, the second lid wall portion 3B is folded at the folds 5Ba and 5Bb so that it is positioned to spread parallel to the XY plane. At this time, the second lid wall portion 3B is positioned to overlap the first lid wall portion 3A and the lid walls 3C and 3D from the positive side in the Z-axis direction. At this time, the second lid wall portion 3B is held by the lid walls 3C and 3D. The second lid wall portion 3B is inserted into the gap between the overlapping first lid wall portion 3A and the lid walls 3C and 3D. Here, the lid walls 3C and 3D have inclined edges 11 that are inclined with respect to the Y-axis direction at the point where they hold the second lid wall portion 3B. Therefore, the protruding piece 17A of the second lid wall portion 3B enters the gap between the third lid wall portion 3C and the first lid wall portion 3A from the position of the inclined edge portion 11 and is held in place by being sandwiched between the third lid wall portion 3C and the first lid wall portion 3A. The protruding piece 17B of the second lid wall portion 3B enters the gap between the fourth lid wall portion 3D and the first lid wall portion 3A from the position of the inclined edge portion 11 and is held in place by being sandwiched between the fourth lid wall portion 3D and the first lid wall portion 3A.
[0025] As described above, the second lid wall portion 3B is held by the first lid wall portions 3A and 3C, 3D, so that, as shown in Figure 2, the positive end of the battery cover 1 in the Z-axis direction is covered by the lid wall portions 3A, 3B, 3C, 3D. At this time, openings 19A, 19B are formed between the area E2 of the lid wall portions 3C, 3D and the main body portion 16 of the second lid wall portion 3B. These openings 19A, 19B allow the terminals of the battery located inside the battery cover 1 to be exposed to the outside. As shown in Figure 3, the negative end of the battery cover 1 in the Z-axis direction is open over its entire surface.
[0026] Here, as shown in Figure 7, each plate-shaped member 20 constituting the wall portion of the battery cover 1 comprises an intermediate layer 21 and outer layers 22, 23. The material of the intermediate layer 21 may be, for example, nonwoven fabric, felt, urethane foam, microfiber, perforated film, fine particle bed, open-cell foam, fiberglass, net, woven fabric, or a combination thereof. The outer layers 22, 23 may be made of a material that prevents liquids such as water from entering the inside of the battery cover 1, and may be, for example, meltblown nonwoven fabric, spunbond nonwoven fabric, film, foil layer, or a combination thereof. Here, the plate-shaped member 20 has a compressed thin portion 24 and an uncompressed non-processed portion 26. In each wall portion shown in Figures 1 to 3, the thicker portion is the unprocessed portion 26, and the thinner portion is the thin portion 24. The thin portion 24 is formed at the edge of each wall portion.
[0027] As shown in Figure 1, the wide portion 12 of the lid wall portions 3C and 3D, which is the engaging portion 10, is subjected to compression to become a thin-walled portion 24. In addition, the protruding pieces 17A and 17B of the second lid wall portion 3B are subjected to compression to become a thin-walled portion 24.
[0028] As shown in Figures 1 and 2, the battery cover 1 has an opening 30 that opens from the internal space to the outside during assembly. The opening 30 is formed at the corner between the second side wall portion 2B and the third side wall portion 2C. At this corner, the opening 30 is formed to extend in the Z-axis direction. Also, as shown in Figure 3, the battery cover 1 has an opening 31 that opens from the internal space to the outside during assembly. The opening 31 is formed at the corner between the first side wall portion 2A and the fourth side wall portion 2D. At this corner, the opening 30 is formed to extend in the Z-axis direction.
[0029] As shown in Figure 8(a), the opening 30 is formed by cutting out the end of the third side wall portion 2C. The edge 30a of the opening 30 on the third side wall portion 2C side and the edge 30b on the second side wall portion 2B side face each other. Of these, a wall portion 32 is formed on the edge 30b on the second side wall portion 2B side, rising from the opening 30. The wall portion 32 has a configuration that is an extension of the second side wall portion 2B.
[0030] As shown in Figure 8(b), the opening 31 is formed by cutting out the end of the fourth side wall 2D and the end of the first side wall 2A. The edge 31a of the opening 31 on the fourth side wall 2D side and the edge 31b on the first side wall 2A side face each other. Of these, the fourth side wall 2D has a wall portion 33 that rises from the opening 31. The wall portion 33 rises inclined relative to the fourth side wall 2D.
[0031] Next, with reference to Figure 9, the precursor 100 of the battery cover 1 will be described. Here, the XYZ coordinates are assumed to maintain the positional relationship with the first side wall portion 2A and the second side wall portion 2B from the assembled state. In the precursor 100, as shown in Figure 9(b), the first side wall portion 2A, the second side wall portion 2B, the third side wall portion 2C, and the fourth side wall portion 2D are fixed in a bendable manner so as to form an annular shape when viewed from the Z-axis direction. Also, in the precursor 100, as shown in Figure 9(a), the first side wall portion 2A, the second side wall portion 2B, the third side wall portion 2C, the fourth side wall portion 2D, the first lid wall portion 3A, the second lid wall portion 3B, the third lid wall portion 3C, and the fourth lid wall portion 3D each spread out or overlap each other in a flat plate shape. In the example shown in Figure 9(a), the first side wall portion 2A, the fourth side wall portion 2D, the first lid wall portion 3A, and the fourth lid wall portion 3D are spread out from each other in a flat, plate-like manner. The second side wall portion 2B, the third side wall portion 2C, the second lid wall portion 3B, and the third lid wall portion 3C are spread out from each other in a flat, plate-like manner. The first side wall portion 2A, the fourth side wall portion 2D, the first lid wall portion 3A, and the fourth lid wall portion 3D overlap with the second side wall portion 2B, the third side wall portion 2C, the second lid wall portion 3B, and the third lid wall portion 3C.
[0032] Next, the assembly method of the battery cover 1 will be described. The assembly method of the battery cover 1 includes a side wall unfolding step (first step) in which each side wall portion 2A, 2B, 2C, and 2D is unfolded from the precursor 100. In the side wall unfolding step, the first side wall portion 2A and the second side wall portion 2B are positioned facing each other in the X-axis direction from the precursor 100 of the battery cover 1, and the third side wall portion 2C and the fourth side wall portion 2D are positioned facing each other in the Y-axis direction. As a result, the battery cover 1 is in the state shown in Figure 1.
[0033] Next, the assembly method for the battery cover 1 includes a lid bending step (second step) in which the first lid wall portion 3A is bent relative to the first side wall portion 2A. As a result, as shown in Figure 4, the first lid wall portion 3A is perpendicular to the first side wall portion 2A. Next, the assembly method for the battery cover 1 includes an engagement step (third step) in which the third lid wall portion 3C is bent relative to the third side wall portion 2C and engages with the first lid wall portion 3A, and the fourth lid wall portion 3D is bent relative to the fourth side wall portion 2D and engages with the first lid wall portion 3A. As a result, as shown in Figure 5, the wide portions 12 of the lid wall portions 3C and 3D engage with the respective openings 9 of the first lid wall portion 3A. Next, the assembly method for the battery cover 1 includes a holding step (fourth step) in which the second lid wall portion 3B is bent relative to the second side wall portion 2B and held by the third lid wall portion 3C and the fourth lid wall portion 3D. As a result, as shown in Figure 6, the protruding pieces 17A and 17B of the second lid wall portion 3B are held by the third lid wall portion 3C and the fourth lid wall portion 3D. Thus, the battery cover 1 is assembled.
[0034] Next, the effects and advantages of the battery cover 1 according to this embodiment will be explained. Here, "2C, 3C" are considered to be the "third side wall portion, third lid wall portion" in the claim, and "2D, 3D" are considered to be the "fourth side wall portion, fourth lid wall portion" in the claim. However, this correspondence is merely for convenience, and the same effects and advantages will be obtained even if "2C, 3C" are considered to be the "fourth side wall portion, fourth lid wall portion" in the claim, and "2D, 3D" are considered to be the "third side wall portion, third lid wall portion" in the claim.
[0035] First, a battery cover relating to a comparative example will be described. An example of a battery cover relating to a comparative example is the battery cover shown in Japanese Patent Publication No. 2017-527488. This battery cover does not have a lid wall connected to the side walls 2B, 2C, and 2D, and only has a lid wall connected to the first side wall. Furthermore, this lid wall is fixed to the second side wall via a fastener. Such a battery cover has the problem that a fastener is required to close the lid wall, which increases the number of parts. In addition, a gap is formed between the side walls 2B, 2C, and 2D and the lid wall, which makes it easier for heat to flow in. Furthermore, because the side walls 2C and 2D do not have a lid wall that functions as a rib, the side walls 2C and 2D deform by bulging outward, further increasing the gap. Adding other components such as fasteners or adhesives to reduce such a gap further increases the number of parts.
[0036] In contrast, the battery cover 1 according to this embodiment is a battery cover 1 that covers a battery and is created by assembling a plurality of wall portions, comprising: a first side wall portion 2A and a second side wall portion 2B that face each other in the X-axis direction (first direction) during assembly; and a third side wall portion 2C and a fourth side wall portion 2D that face each other in the Y-axis direction (second direction) perpendicular to the X-axis direction between the first side wall portion 2A and the second side wall portion 2B during assembly. The battery cover 1 also comprises a first lid wall portion 3A, a second lid wall portion 3B, and a third lid wall portion 3C that are foldable and fixed to each of the ends of the first side wall portion 2A, the second side wall portion 2B, and the third side wall portion 2C in the Z-axis direction (third direction) perpendicular to the X-axis direction and the Y-axis direction. The first lid wall portion 3A and the third lid wall portion 3C each have engaging portions 10 that directly engage with each other during assembly, and the second lid wall portion 3B is held by the third lid wall portion 3C during assembly.
[0037] The battery cover 1 according to this embodiment includes lid walls 3A, 3B, and 3C fixed to each side wall 2A, 2B, and 2C. In this way, since lid walls are provided not only on the first side wall 2A but also on the other side walls 2B and 2C, the gap formed on the upper surface of the battery cover 1 can be reduced. Furthermore, the first lid wall 3A and the third lid wall 3C each have engaging parts 10 that directly engage with each other during assembly. Therefore, the lid walls 3A and 3C can be fixed in a closed state without using separate components such as fasteners or adhesives by engaging with each other. Also, the second lid wall 3B is held by the third lid wall 3C during assembly. Therefore, the second lid wall 3B can be fixed in a closed state without using separate components such as fasteners or adhesives by being held by the third lid wall 3C. As a result, the number of components can be reduced while improving heat insulation.
[0038] The battery cover 1 may further include a fourth lid wall portion 3D that is foldable and fixed to one end of the fourth side wall portion 2D in the Z-axis direction. In this case, the gap on the upper side of the fourth side wall portion 2D can be reduced.
[0039] The second lid wall portion 3B may be inserted into the gap between the overlapping first lid wall portion 3A and the third lid wall portion 3C. In this case, the third lid wall portion 3C can easily hold the second lid wall portion 3B simply by inserting it into the gap.
[0040] The second lid wall portion 3B may have protruding pieces 17A and 17B that project toward the third lid wall portion 3C. In this case, the second lid wall portion 3B can be easily inserted into the gap between the first lid wall portion 3A and the third lid wall portion 3C.
[0041] The third lid wall portion 3C may have an inclined edge portion 11 that is inclined with respect to the Y-axis direction at the location where it holds the second lid wall portion 3B. In this case, the second lid wall portion 3B can be easily inserted into the gap between the first lid wall portion 3A and the third lid wall portion 3C.
[0042] The portion of the second lid wall portion 3B that is held by the third lid wall portion 3C (protruding piece 17A) may be compressed. In this case, the second lid wall portion 3B can be easily inserted into the gap between the first lid wall portion 3A and the third lid wall portion 3C.
[0043] The engagement portion 10 of the third lid wall portion 3C may be subjected to compression treatment. In this case, it becomes easier to engage the second lid wall portion 3B with the first lid wall portion 3A.
[0044] The battery cover 1 has openings 30 and 31 that open from the internal space to the outside during assembly, and one of a pair of opposing edges of the openings 30 and 31 may have walls 32 and 33 that rise from the openings 30 and 31. In this case, the battery cover 1 can dissipate heat from the internal space to the outside through the openings 30 and 31. In addition, the walls 32 and 33 can prevent external heat from entering through the openings 30 and 31.
[0045] A precursor 100 of the battery cover 1 according to one aspect of this embodiment is the precursor 100 of the battery cover 1 described above, wherein the first side wall portion 2A, the second side wall portion 2B, the third side wall portion 2C, and the fourth side wall portion 2D are fixed so as to be bendable toward each other so as to form an annular shape when viewed from the Z-axis direction, and each of the first side wall portion 2A, the second side wall portion 2B, the third side wall portion 2C, the fourth side wall portion 2D, the first lid wall portion 3A, the second lid wall portion 3B, and the third lid wall portion 3C spreads out toward each other in a flat plate shape or overlaps.
[0046] According to this precursor for battery cover 1, the battery cover 1 described above can be easily assembled, and the same functions and effects as those of battery cover 1 can be obtained.
[0047] A method for assembling the battery cover 1 according to one aspect of this embodiment is a method for assembling the battery cover 1 described above, comprising: a first step of arranging the precursor 100 of the battery cover 1 so that the first side wall portion 2A and the second side wall portion 2B face each other in the X-axis direction, and the third side wall portion 2C and the fourth side wall portion 2D face each other in the Y-axis direction; a second step of bending the first lid wall portion 3A relative to the first side wall portion 2A; a third step of bending the third lid wall portion 3C relative to the third side wall portion 2C to engage with the first lid wall portion 3A; and a fourth step of bending the second lid wall portion 3B relative to the second side wall portion 2B to hold it in place by the third lid wall portion 3C.
[0048] According to this assembly method for the battery cover 1, the battery cover 1 described above can be easily assembled, and the same functions and effects as the battery cover 1 can be obtained.
[0049] The present invention is not limited to the embodiments described above.
[0050] For example, the shape and size of the battery cover 1 according to the above embodiment are merely examples and may be modified as appropriate without departing from the spirit of the present invention.
[0051] For example, either the third lid wall portion 3C or the fourth lid wall portion 3D may be omitted.
[0052] To secure the lid wall, additional components such as fasteners or adhesives may be added, provided that the number of parts does not increase excessively. [Explanation of Symbols]
[0053] 1...Battery cover, 2A...First side wall, 2B...Second side wall, 2C...Third side wall, 2D...Fourth side wall, 3A...First lid wall, 3B...Second lid wall, 3C...Third lid wall, 3D...Fourth lid wall, 10...Engaging part, 11...Inclined edge, 17A,17B...Protruding piece, 30,31...Opening, 32,33...Wall, 100...Precursor.
Claims
1. A battery cover that covers a battery, created by assembling multiple wall sections, During assembly, the first side wall portion and the second side wall portion are arranged facing each other in the first direction, During assembly, a third side wall portion and a fourth side wall portion are formed between the first side wall portion and the second side wall portion, facing each other in a second direction perpendicular to the first direction, The first side wall portion, the second side wall portion, and the third side wall portion are each foldably fixed to one end of the first direction and the third direction perpendicular to the second direction, The first lid wall portion and the third lid wall portion each have engaging portions that directly engage with each other during assembly. The second lid wall portion is a battery cover that is held in place by the third lid wall portion during assembly.
2. The battery cover according to claim 1, further comprising a fourth lid wall portion that is foldable and fixed to one end of the fourth side wall portion in the third direction.
3. The battery cover according to claim 1 or 2, wherein the second lid wall portion is inserted into the gap between the overlapping first lid wall portion and the third lid wall portion.
4. The battery cover according to any one of claims 1 to 3, wherein the second lid wall portion has a protruding piece that projects toward the third lid wall portion.
5. The battery cover according to any one of claims 1 to 4, wherein the third lid wall portion has an inclined edge portion that is inclined with respect to the second direction at a portion that holds the second lid wall portion.
6. The battery cover according to any one of claims 1 to 5, wherein the portion of the second lid wall that is held by the third lid wall is subjected to compression treatment.
7. The battery cover according to any one of claims 1 to 6, wherein the engagement portion of the third lid wall portion is subjected to compression treatment.
8. A battery cover according to any one of claims 1 to 7, wherein the battery cover has an opening that opens from the internal space to the outside when assembled, and a wall portion is formed on one of a pair of opposing edges of the opening that rises from the opening.
9. A precursor for a battery cover according to any one of claims 1 to 8, The first side wall portion, the second side wall portion, the third side wall portion, and the fourth side wall portion are fixed in such a way that they form an annular shape when viewed from the third direction, so as to be bendable relative to each other. A precursor to a battery cover, wherein the first side wall portion, the second side wall portion, the third side wall portion, the fourth side wall portion, the first lid wall portion, the second lid wall portion, and the third lid wall portion each spread out or overlap each other in a flat plate shape.
10. A method for assembling a battery cover according to any one of claims 1 to 8, A first step involves arranging the battery cover precursor such that the first side wall portion and the second side wall portion face each other in the first direction, and the third side wall portion and the fourth side wall portion face each other in the second direction, A second step of bending the first lid wall portion relative to the first side wall portion, A third step involves bending the third lid wall portion relative to the third side wall portion to engage with the first lid wall portion, A method for assembling a battery cover, comprising a fourth step of bending the second lid wall portion relative to the second side wall portion and holding it in place with the third lid wall portion.