Resin housing

Abstract

To couple parts with each other without bending a fitting piece away from the parts in a resin housing including a plurality of parts to be coupled with each other.SOLUTION: A resin case 2 comprises: a top plate part 2a; a side wall part 2b which is erected on a surface of the top plate part 2a; and a projection 2c which protrudes from a surface of the side wall part 2b. A resin cover 3 comprises: a bottom plate part 3a which is disposed oppositely to the top plate part 2a so as to form a clearance between the bottom plate part and the top plate part 2a; and a fitting piece 3b which is erected on a surface of the bottom plate part 3a and disposed oppositely with a face of the side wall part 2b where the projection 2c is provided. In the fitting piece 3b, an insertion / removal slit 30 is provided which is formed in an extension direction that is a direction in which the fitting piece 3b extends from the surface of the bottom plate part 3a, and of which one end is made into an open end such that the projection 2c can be inserted / removed in the extension direction. The fitting piece includes a pair of holding pieces 31 for holding the projection 2c inserted into the insertion / removal slit 30 therebetween in a direction orthogonal to a direction in which the projection 2c protrudes from the surface of the side wall part 2b.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a resin housing. [Background technology]

[0002] For example, Patent Document 1 discloses a resin housing that includes a resin case and a resin cover attached to the resin case. As disclosed in Patent Document 1, in various electronic devices, electronic components and electronic circuits are housed in a resin housing in a state where they are incorporated into a printed circuit board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-194987 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a mating piece is provided on the resin cover, and a mating protrusion is provided on the resin case. The mating piece of the resin cover is fitted into the mating protrusion of the resin case, thereby holding and fixing the resin cover to the resin case. When attaching the resin cover to the resin case, the mating piece needs to bend in a direction away from the resin case. If the mating piece needs to be bent in a direction away from the resin case, the thickness of the mating piece needs to be thin, which makes it difficult to increase the rigidity of the mating piece. This requires, for example, providing multiple mating pieces. In other words, in a resin housing having multiple parts that are fastened together, as in Patent Document 1, providing a mating piece that bends relative to one part so as to move away from the other part makes it difficult to ensure the rigidity of the mating piece.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a plastic housing having multiple parts that are fastened to each other, which can fasten the parts together without bending the mating pieces so that they are separated from the parts. [Means for solving the problem]

[0006] The present invention employs the following configuration as a means for solving the above problems.

[0007] A first aspect of the present invention is a plastic housing having a first part and a second part that are fastened to each other, wherein the first part has a first flat plate portion, a standing plate portion standing on the surface of the first flat plate portion, and a protrusion protruding from the surface of the standing plate portion, and the second part has a second flat plate portion that is arranged opposite the first flat plate portion so as to form a gap between it and the first flat plate portion, and a fitting piece that is arranged opposite the surface of the standing plate portion on which the protrusion is provided, and the fitting piece is formed along an extension direction in which the fitting piece extends from the surface of the second flat plate portion, and is provided with an insertion / removal slit that allows the protrusion to be inserted and removed in the extension direction, and has a pair of clamping pieces that clamp the protrusion inserted into the insertion / removal slit from a direction perpendicular to the direction in which the protrusion protrudes from the surface of the standing plate portion. [Effects of the Invention]

[0008] According to the present invention, the first part and the second part can be fastened together by inserting the protrusion of the first part into the insertion / removal slit of the second part and clamping the protrusion between the clamping pieces provided on the mating pieces. The insertion / removal slit is formed along the extension direction of the mating piece, and is formed so that one end is an open end. Therefore, the first part and the second part can be fastened together without bending the mating piece away from the upright plate portion on which the protrusion is provided. In other words, the present invention is a resin housing having multiple parts to be fastened together, and the parts can be fastened together without bending the mating piece away from the parts. According to this invention, the mating piece can be formed thick, thereby improving the rigidity of the mating piece. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a schematic configuration of a battery management unit including a resin housing according to a first embodiment of the present invention. [Figure 2] 3 is an enlarged exploded perspective view of the plastic casing according to the first embodiment of the present invention, including one groove in the front wall portion. FIG. [Figure 3] 2 is an enlarged front view of the plastic casing according to the first embodiment of the present invention, including a fitting piece, as seen from the front. FIG. [Figure 4] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 5] FIG. 10 is an enlarged exploded perspective view of a plastic casing according to a second embodiment of the present invention, including one groove in the front wall portion. [Figure 6] 10 is an enlarged front view of a plastic casing according to a second embodiment of the present invention, including a fitting piece, as seen from the front. FIG. [Figure 7] FIG. 11 is an enlarged exploded perspective view of a plastic casing according to a third embodiment of the present invention, including one groove in the front wall portion. [Figure 8] FIG. 11 is an enlarged front view of a plastic housing according to a third embodiment of the present invention, including a fitting piece, as seen from the front. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plastic housing according to the present invention will now be described with reference to the drawings.

[0011] (First embodiment) FIG. 1 is a perspective view showing a schematic configuration of a battery management unit 100 including a plastic housing 1 of this embodiment. The battery management unit 100 is an electronic device mounted on an electric vehicle such as an electric car or a hybrid car, and manages a plurality of battery modules. In this embodiment, an example in which the plastic housing of the present invention is applied to the battery management unit 100 will be described, but the present invention is not limited thereto. The plastic housing of the present invention can also be used in other electronic devices, etc.

[0012] The installation posture of the battery management unit 100 is not particularly limited. However, for convenience of explanation, in the following explanation, the direction in which a resin case 2 and a resin cover 3 (described later) are stacked is referred to as the up-down direction, as shown in Fig. 1. Furthermore, one of the horizontal directions perpendicular to the up-down direction is referred to as the front-rear direction, and the direction perpendicular to the up-down direction and the front-rear direction is referred to as the left-right direction.

[0013] 1, the battery management unit 100 of this embodiment includes a resin housing 1, a plurality of connectors 101, and a circuit board (not shown). The resin housing 1 is a housing made of a material containing resin, and houses the connectors 101 and the circuit board. The resin housing 1 is formed using a resin compound in which glass fiber is added as a reinforcing material to a resin such as PBT (polybutylene terephthalate).

[0014] The plastic housing 1 is formed in a rectangular (polygonal) shape when viewed from above. In this embodiment, the plastic housing 1 has two short sides 1a arranged parallel to the front-rear direction and two long sides 1b arranged parallel to the left-right direction.

[0015] In this embodiment, the resin casing 1 is formed by fastening two parts (a resin case 2 and a resin cover 3). That is, the resin casing 1 of this embodiment includes the resin case 2 (first part) and the resin cover 3 (second part) that are fastened together. The resin case 2 and the resin cover 3 are formed, for example, by injection molding, which uses a mold to mold the above-mentioned resin compound.

[0016] The resin case 2 is located above the resin cover 3 and has a top plate portion 2a (first flat plate portion), side wall portions 2b (standing plate portions), and protrusion portions 2c. The top plate portion 2a is a rectangular plate-shaped portion that covers the connector 101 and the circuit board from above, and is arranged so that its front and back surfaces face up and down. In other words, the bottom surface of the top plate portion 2a faces the connector 101 and the circuit board housed inside the resin housing 1 from above.

[0017] The side wall 2b is formed to hang down from the outer edge of the top plate 2a. In other words, the side wall 2b is erected so as to protrude downward from the underside of the top plate 2a. The side wall 2b is formed in a ring shape when viewed from below so as to surround the connector 101 and the circuit board from the horizontal direction. The side wall 2b has a front wall 2b1 that forms the front portion of the side wall 2b, a rear wall 2b2 that forms the rear portion of the side wall 2b, a left wall 2b3 that forms the left portion of the side wall 2b, and a right wall 2b4 that forms the right portion of the side wall 2b.

[0018] The front wall portion 2b1 has its outer wall surface facing forward and its inner wall surface facing rearward. The rear wall portion 2b2 has its outer wall surface facing rearward and its inner wall surface facing forward. The left wall portion 2b3 has its outer wall surface facing leftward and its inner wall surface facing rightward. The right wall portion 2b4 has its outer wall surface facing rightward and its inner wall surface facing leftward.

[0019] The front wall portion 2b1 is provided with connector openings 20 that penetrate in the front-rear direction. In this embodiment, three connectors 101 are provided. The number of connector openings 20 provided is the same as the number of connectors 101, and in this embodiment, three connector openings 20 are provided. These connector openings 20 are arranged in the left-right direction, and each exposes a connector 101.

[0020] As shown in Fig. 1, the front wall 2b1 is provided with three grooves 21 of the same shape. Fig. 2 is an exploded enlarged perspective view of the plastic housing 1 including one groove 21 of the front wall 2b1. As shown in this figure, the groove 21 is formed by recessing a portion of the outer wall surface of the front wall 2b1 toward the rear, and is formed so that both the upper and lower ends are open ends. As shown in Fig. 2, the groove 21 is formed so that the width dimension (dimension in the left-right direction) of the lower part is larger than the width dimension of the upper part.

[0021] The lower part of such groove 21 can accommodate fitting pieces 3b (described later) of resin cover 3. The depth dimension (dimension in the front-to-rear direction) of groove 21 is preferably the same as or greater than the thickness dimension of fitting piece 3b. This allows fitting piece 3b to be entirely accommodated in groove 21, and prevents fitting piece 3b from protruding outward from the outer wall surface of side wall 2b.

[0022] A protrusion 2c is provided on the bottom surface 21a of the lower portion of such groove 21. The bottom surface 21a of groove 21 forms part of the outer wall surface (surface) of side wall 2b. In other words, protrusion 2c is provided so as to protrude from bottom surface 21a, which is part of the surface of side wall 2b.

[0023] Additionally, the bottom surface 21a of the groove 21 (the surface on which the protrusion 2c is provided) abuts against the surface of the fitting piece 3b housed in the groove 21. The surface of the fitting piece 3b abuts against the bottom surface 21a of the groove 21, thereby positioning the resin case 2 and the resin cover 3 in the horizontal direction. In this embodiment, the surface of the fitting piece 3b abuts against the bottom surface 21a of the groove 21 provided in the front wall 2b1, thereby restricting the resin cover 3 from moving rearward relative to the resin case 2.

[0024] One protrusion 2c is provided in each groove 21. Each protrusion 2c is formed in a cylindrical shape with its axis parallel to the front-rear direction. The amount of protrusion 2c protruding from the bottom surface 21a of groove 21 is set so that the tip of protrusion 2c does not protrude from groove 21. The bottom surface 21a of such groove 21 is a contact surface with clamping piece 31, which is provided in fitting piece 3b and will be described later.

[0025] A plurality of such grooves 21 and protrusions 2c are also provided on the rear wall 2b2. The grooves 21 and protrusions 2c provided on the rear wall 2b2 are formed symmetrically with the grooves 21 and protrusions 2c provided on the front wall 2b1, with the grooves 21 and protrusions 2c centered on a plane of symmetry that includes the up-down and left-right directions. Therefore, a detailed description of the grooves 21 and protrusions 2c provided on the rear wall 2b2 will be omitted. Note that the surface of the fitting piece 3b abuts against the bottom surface 21a of the groove 21 provided on the rear wall 2b2, thereby restricting forward movement of the resin cover 3 relative to the resin case 2.

[0026] Returning to FIG. 1, the resin cover 3 forms the bottom of the resin housing 1 and has a bottom plate portion 3a (second flat plate portion) and a fitting piece 3b. The bottom plate portion 3a is a rectangular plate-shaped portion disposed opposite the top plate portion 2a so as to form a gap between it and the top plate portion 2a. The bottom plate portion 3a is disposed so that its front and back surfaces face the vertical direction. In other words, the top surface of the bottom plate portion 3a faces the connector 101 and the circuit board housed inside the resin housing 1 from below. The bottom plate portion 3a is formed in substantially the same shape as the top plate portion 2a when viewed from above.

[0027] As shown in FIG. 2, the fitting pieces 3b are plate-shaped portions formed to extend upward from the outer edge of the bottom plate portion 3a. Such fitting pieces 3b are erected on the upper surface, which is the front surface of the bottom plate portion 3a. The fitting pieces 3b are arranged so that their front and back surfaces face the front-rear direction. In this embodiment, the number of fitting pieces 3b provided is the same as the number of protrusions 2c of the resin case 2. When accommodated in the groove portion 21, each fitting piece 3b is arranged opposite and in contact with the surface of the side wall portion 2b on which the protrusions 2c are provided.

[0028] In this way, each fitting piece 3b is provided at a position where it can be accommodated in the groove 21 when the resin case 2 and the resin cover 3 are fastened together. That is, the fitting pieces 3b are provided at the front edge and the rear edge of the bottom plate portion 3a.

[0029] Each fitting piece 3b is provided with an insertion / removal slit 30. The insertion / removal slit 30 is provided so as to extend upward from the center of the fitting piece 3b. The upper end of the insertion / removal slit 30 is an open end, allowing the protrusion 2c to be inserted and removed in the vertical direction.

[0030] 3 is an enlarged front view including the fitting piece 3b, as seen from the front. As shown in this figure, the lower portion of the insertion / removal slit 30 is formed in a circular shape. Furthermore, the width dimension of the upper portion of the insertion / removal slit 30 in the left-right direction decreases as it goes from top to bottom. As the upper portion of the insertion / removal slit 30 narrows downward in this manner, an inclined surface 30a is formed on the inner wall surface of the insertion / removal slit 30. This inclined surface 30a is inclined so that it is exposed when viewed from above. The width dimension of the lower end of the upper portion of the insertion / removal slit 30 (hereinafter referred to as narrow portion 30b) is slightly smaller than the diameter of the protrusion 2c.

[0031] The fitting piece 3b has a pair of clamping pieces 31 (a left clamping piece 32 and a right clamping piece 33) arranged to sandwich the insertion / removal slit 30 therebetween. Each of the clamping pieces 31 is elastically deformable so that its upper end moves left and right. Therefore, when the protrusion 2c passes through the narrow portion 30b of the insertion / removal slit 30, the clamping pieces 31 elastically deform so as to widen the insertion / removal slit 30. In other words, when the protrusion 2c passes through the narrow portion 30b of the insertion / removal slit 30, the left clamping piece 32 of the clamping piece 31 elastically deforms so that its upper end moves leftward, as shown by the imaginary line in FIG. 3. Furthermore, when the protrusion 2c passes through the narrow portion 30b of the insertion / removal slit 30, the right clamping piece 33 of the clamping piece 31 elastically deforms so that its upper end moves rightward, as shown by the imaginary line in FIG. 3.

[0032] When the protrusion 2c passes through the narrow portion 30b of the insertion / removal slit 30, the clamping pieces 31 return to their original shape. The lower portion of the insertion / removal slit 30 is formed to a size that allows the protrusion 2c to fit into it. Therefore, the protrusion 2c located at the lower portion of the insertion / removal slit 30 is clamped from the left and right by the clamping pieces 31. The protrusion 2c is clamped by the clamping pieces 31, whereby the resin case 2 and the resin cover 3 are fastened together.

[0033] Fig. 4 is a cross-sectional view taken along the line AA in Fig. 1. As shown in this figure, when the protrusion 2c is clamped by the clamping pieces 31, a part of the clamping pieces 31 of the resin cover 3 is positioned above the protrusion 2c. Therefore, when the protrusion 2c is clamped by the clamping pieces 31, movement of the protrusion 2c in the up-down and left-right directions relative to the resin case 2 is restricted.

[0034] The above-described protrusion 2c and the fitting piece 3b having the clamping piece 31 that clamps the protrusion 2c form one fastening mechanism 40. That is, in this embodiment, the resin case 2 and the resin cover 3 are fastened together by a plurality of fastening mechanisms 40. The plurality of fastening mechanisms 40 are provided on each of the two long sides 1b of the resin housing 1. In this embodiment, three fastening mechanisms 40 are provided for one long side 1b. Thus, in this embodiment, the shape of the resin housing is rectangular (polygonal) when viewed from above (in the direction in which the fitting piece 3b extends), and a fastening mechanism 40 is provided on each of the different sides (the two long sides 1b). These fastening mechanisms 40 position the resin cover 3 horizontally relative to the resin case 2.

[0035] Returning to FIG. 1 , the plurality of connectors 101 are connected to harnesses that connect the battery management unit 100 to external devices. That is, the battery management unit 100 is connected to external devices via the connectors 101. These connectors 101 are arranged so as to be exposed from connector openings 20 in the plastic housing 1. The circuit board is formed by mounting electronic components such as integrated circuit chips on a printed wiring board. The above-mentioned connectors 101 are also mounted on the circuit board. These connectors 101 and the circuit board are housed in a space surrounded by the top plate portion 2a, side wall portion 2b, and bottom plate portion 3a of the plastic case 2.

[0036] When assembling such a battery management unit 100, the resin case 2 and the resin cover 3 are fastened together with the connector 101 and the circuit board fixed to the resin case 2 or the resin cover 3. Note that the directions (up-down direction, front-rear direction, and left-right direction) described here are based on the above explanation, but the posture when actually assembling the resin case 2 and the resin cover 3 is not limited to this.

[0037] When fastening the resin case 2 and the resin cover 3, for example, as shown in Fig. 3, the resin case 2 and the resin cover 3 are moved relative to each other so that the fitting pieces 3b of the resin cover 3 are inserted into the grooves 21 of the resin case 2 from below. At this time, the protrusions 2c of the resin case 2 are inserted into the insertion / removal slits 30 of the fitting pieces 3b from above. The peripheral surface of the protrusions 2c inserted into the insertion / removal slits 30 from above comes into contact with the inclined surfaces 30a, and the protrusions 2c move to the bottom of the insertion / removal slits 30 while being guided by the inclined surfaces 30a.

[0038] When the protrusion 2c passes through the narrow portion 30b of the inclined surface 30a (the narrowest portion of the insertion / removal slit 30), the clamping pieces 31 elastically deform to widen the insertion / removal slit 30. Specifically, as shown in FIG. 3, the left clamping piece 32 elastically deforms to move to the left, and the right clamping piece 33 elastically deforms to move to the right. Thereafter, when the protrusion 2c passes through the narrow portion 30b, which is the lower end of the inclined surface 30a, the clamping pieces 31 return to their original shape and clamp the protrusion 2c. This fastens the resin case 2 and the resin cover 3 together.

[0039] Such protrusion 2c moves from above to below while its peripheral surface slides on the inner wall surface of insertion / removal slit 30. The peripheral surface of protrusion 2c abuts against the inner wall surface of insertion / removal slit 30, thereby restricting the resin cover 3 from moving in the left-right direction relative to the resin case 2. Furthermore, the protrusion 2c fits into the lower part of insertion / removal slit 30, thereby restricting the resin cover 3 from moving in the up-down direction relative to the resin case 2.

[0040] Furthermore, when the protrusion 2c is positioned within the insertion / removal slit 30, the surface of the fitting piece 3b abuts against the bottom surface 21a of the groove 21 of the resin case 2. In other words, when the protrusion 2c is moved within the insertion / removal slit 30, the surface of the fitting piece 3b slides against the bottom surface 21a of the groove 21 of the resin case 2.

[0041] In this manner, the surface of the fitting piece 3b abuts against the bottom surface 21a of the groove portion 21 of the resin case 2, thereby restricting the resin cover 3 from moving in the front-to-rear direction relative to the resin case 2. Specifically, the fitting piece 3b provided on the front edge portion of the bottom plate portion 3a abuts against the bottom surface 21a of the groove portion 21 provided in the front wall portion 2b1 from the front side, thereby restricting the resin cover 3 from moving rearward relative to the resin case 2. Furthermore, the fitting piece 3b provided on the rear edge portion of the bottom plate portion 3a abuts against the bottom surface 21a of the groove portion 21 provided in the rear wall portion 2b2 from the rear, thereby restricting the resin cover 3 from moving forward relative to the resin case 2.

[0042] Therefore, in this embodiment, the resin cover 3 is positioned relative to the resin case 2 in the front-rear and left-right directions while being moved relative to the resin case 2. When the protrusion 2c reaches the lower part of the insertion / removal slit 30, the resin cover 3 is positioned relative to the resin case 2 not only in the front-rear and left-right directions but also in the up-down direction.

[0043] The resin casing 1 of this embodiment includes a resin case 2 and a resin cover 3 that are fastened together. The resin case 2 includes a top plate 2a, a side wall 2b, and a protrusion 2c. The side wall 2b is erected on the surface of the top plate 2a. The protrusion 2c protrudes from the surface of the side wall 2b. The resin cover 3 includes a bottom plate 3a and a fitting piece 3b. The bottom plate 3a is disposed opposite the top plate 2a so as to form a gap between the top plate 2a and the fitting piece 3b. The fitting piece 3b is erected on the surface of the bottom plate 3a and is disposed opposite the surface of the side wall 2b on which the protrusion 2c is provided. The fitting piece 3b is formed along the extension direction, which is the direction in which the fitting piece 3b extends from the surface of the bottom plate 3a, and has an insertion / removal slit 30 at one end that is open and allows the protrusion 2c to be inserted and removed in the extension direction. The fitting piece 3b also includes a pair of clamping pieces 31. The clamping pieces 31 clamp the protrusion 2c inserted into the insertion / removal slit 30 from a direction perpendicular to the direction in which the protrusion 2c protrudes from the surface of the side wall 2b.

[0044] According to the plastic casing 1 of this embodiment, the plastic case 2 and the plastic cover 3 can be fastened together by inserting the protrusion 2c of the plastic case 2 into the insertion / removal slit 30 of the plastic cover 3 and clamping the protrusion 2c between the clamping pieces 31 provided on the fitting pieces 3b. The insertion / removal slit 30 is formed along the extension direction of the fitting pieces 3b, with one end being open. This allows the plastic case 2 and the plastic cover 3 to be fastened together without bending the fitting pieces 3b away from the side wall 2b on which the protrusion 2c is provided (moving them in the front-to-rear direction). In other words, the plastic casing 1 of this embodiment allows parts to be fastened together without bending the fitting pieces 3b away from the plastic case 2. According to the present invention, the fitting pieces 3b can be formed thicker, thereby improving the rigidity of the fitting pieces 3b.

[0045] In addition, in the resin housing 1 of this embodiment, the clamping piece 31 is elastically deformable in a direction (left-right direction) perpendicular to the direction in which the protrusion 2c protrudes from the surface of the side wall 2b. Therefore, by restoring the clamping piece 31, it is possible to prevent the protrusion 2c located at the bottom of the insertion / removal slit 30 from moving in the up-down direction.

[0046] Furthermore, in the plastic housing 1 of this embodiment, the protrusion 2c is formed in a cylindrical shape, the peripheral surface of which is the contact surface with the clamping piece 31. According to the plastic housing 1 of this embodiment, the contact surface of the protrusion 2c with the clamping piece 31 is a curved surface, which reduces the sliding resistance between the protrusion 2c and the clamping piece 31. This allows the plastic cover 3 to be attached to and detached from the plastic case 2 smoothly.

[0047] Furthermore, in the plastic casing 1 of this embodiment, the side wall 2b has a groove 21 that can accommodate at least a portion of the fitting piece 3b. Furthermore, the protrusion 2c protrudes from the bottom surface 21a of the groove 21. According to the plastic casing 1 of this embodiment, by accommodating the fitting piece 3b in the groove 21, it is possible to prevent the fitting piece 3b from protruding sideways.

[0048] In addition, in the plastic housing 1 of this embodiment, the surface of the side wall 2b on which the protrusion 2c is provided abuts against the surface of the fitting piece 3b. With the plastic housing 1 of this embodiment, it is possible to restrict the plastic cover 3 from moving in one horizontal direction relative to the plastic case 2 without providing a separate positioning mechanism. This makes it easy to assemble the plastic cover 3 and the plastic case 2.

[0049] The plastic casing 1 of this embodiment also includes a plurality of fastening mechanisms 40. Each fastening mechanism 40 has a protrusion 2c and a clamping piece 31 that clamps the protrusion 2c. The plastic casing has a polygonal (rectangular) shape when viewed from above along the extension direction. A fastening mechanism 40 is provided on each of different sides of the polygon (two long sides 1b in this embodiment).

[0050] According to the plastic housing 1 of this embodiment, the fastening mechanisms 40 provided on different sides can restrict movement of the plastic cover 3 relative to the plastic case 2 in multiple horizontal directions. This makes it even easier to assemble the plastic cover 3 and the plastic case 2.

[0051] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Figures 5 and 6. In the description of this embodiment, the description of the same parts as those in the first embodiment will be omitted or simplified.

[0052] Fig. 5 is an exploded enlarged perspective view of the plastic casing 1A of this embodiment, including one groove 21 in the front wall 2b1. Fig. 6 is an enlarged front view of the plastic casing 1A of this embodiment, including the fitting piece 3b, as seen from the front. As shown in these figures, in the plastic casing 1A of this embodiment, the protrusion 2c has a central slit 2c1 (protrusion slit).

[0053] The central slit 2c1 is formed to extend in the vertical direction, with the upper and lower ends being open. In other words, the central slit 2c1 is provided to penetrate the protrusion 2c from top to bottom. The protrusion 2c having such a central slit 2c1 has a portion on the left side of the central slit 2c1 and a portion on the right side of the central slit 2c1. When the protrusion 2c passes through the narrow portion of the insertion / removal slit 30, the portion on the left side of the central slit 2c1 bends toward the right, and the portion on the right side of the central slit 2c1 bends toward the left.

[0054] According to the resin casing 1A of this embodiment, the protrusion 2c also elastically deforms in addition to the clamping pieces 31. This allows the protrusion 2c to easily pass through the narrow portion of the insertion / removal slit 30.

[0055] In addition, by making the protrusion 2c elastically deformable as in this embodiment, the strength of the clamping piece 31 may be increased to the extent that it does not elastically deform. In such a case, it is possible to further improve the rigidity of the fitting piece 3b.

[0056] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Figures 7 and 8. In the description of this embodiment, the description of the same parts as those in the first embodiment will be omitted or simplified.

[0057] Fig. 7 is an enlarged exploded perspective view of the plastic casing 1B of this embodiment, including one groove 21 in the front wall 2b1. Fig. 6 is an enlarged front view of the plastic casing 1B of this embodiment, including the fitting piece 3b, as seen from the front. As shown in these figures, in the plastic casing 1B of this embodiment, the insertion / removal slit 30 reaches the lower end of the fitting piece 3b. In other words, the upper and lower ends of the insertion / removal slit 30 are open ends. Furthermore, the width of the insertion / removal slit 30 in the left-right direction is the same below the narrow portion 30b.

[0058] When molding the resin cover 3 using a mold, such insertion / removal slit 30 allows a parting line PL (see FIG. 8) to be set in the narrow portion 30b, and it is possible to form the insertion / removal slit 30 having different shapes at the top and bottom without using a slide mold. Therefore, according to the resin casing 1B of this embodiment, it is easy to form the resin cover 3.

[0059] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above-described embodiments. The shapes and combinations of the components shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0060] For example, in the above embodiment, a configuration in which the fastening mechanism 40 is provided on each of the two long sides 1b has been described. However, the present invention is not limited to this. For example, the present invention can also employ a configuration in which the fastening mechanism 40 is provided on only one of the short side 1a and the long side 1b. In such a case, the resin cover 3 may be positioned relative to the resin case 2 by another positioning mechanism, etc., as necessary.

[0061] In the above embodiment, the protrusion 2c has been described as having a cylindrical shape, but the present invention is not limited to this, and protrusions of other shapes may also be used.

[0062] In the above embodiment, the side wall 2b is provided as the upright plate portion. However, the present invention is not limited to this. For example, the upright plate portion may be provided in a position different from the side wall 2b.

[0063] In the above embodiment, the surface of the side wall portion 2b and the surface of the fitting piece 3b are in slidable contact with each other. However, the present invention is not limited to this. For example, the side wall portion 2b and the fitting piece 3b may be disposed opposite each other with a gap therebetween.

[0064] In the above embodiment, the first part having the protrusion is a resin case, and the second part having the fitting piece is a resin cover. However, the present invention is not limited to this. It is also possible to adopt a configuration in which the first part having the protrusion is a resin cover, and the second part having the fitting piece is a resin case.

[0065] The above embodiment can also be described as follows, for example:

[0066] (Appendix 1) A resin housing having a first part and a second part that are fastened to each other, The first part is A first flat plate portion; an upright plate portion provided upright on a surface of the first flat plate portion; a protrusion protruding from the surface of the standing plate portion; and The second part is a second flat plate portion disposed opposite the first flat plate portion so as to form a gap between the first flat plate portion and the second flat plate portion; a fitting piece that is erected on the surface of the second flat plate portion and is arranged to face the surface of the erect plate portion on which the protrusion portion is provided; and The fitting piece is an insertion / removal slit formed along an extension direction, which is a direction in which the fitting piece extends from the surface of the second flat plate portion, and having one end as an open end, into which the protrusion can be inserted and removed in the extension direction; The protrusion inserted into the insertion / removal slit has a pair of clamping pieces that clamp the protrusion from a direction perpendicular to the direction in which the protrusion protrudes from the surface of the standing plate portion. A resin housing characterized by:

[0067] (Appendix 2) The resin housing according to claim 1, wherein the clamping piece is elastically deformable in a direction perpendicular to the direction in which the protrusion protrudes from the surface of the upright plate portion.

[0068] (Appendix 3) 3. The resin housing according to claim 1, wherein the protrusion has a protrusion slit penetrating the protrusion in the extension direction.

[0069] (Appendix 4) 4. The resin casing according to any one of claims 1 to 3, wherein the protrusion is formed in a cylindrical shape with a peripheral surface that is a contact surface with the clamping pieces.

[0070] (Appendix 5) the upright plate portion has a groove portion capable of accommodating at least a portion of the fitting piece, The protrusion protrudes from the bottom surface of the groove. 5. The resin casing according to any one of claims 1 to 4.

[0071] (Appendix 6) 6. The resin casing according to any one of claims 1 to 5, wherein the surface of the upright plate portion on which the protrusion is provided is in contact with a surface of the fitting piece.

[0072] (Appendix 7) a plurality of fastening mechanisms including the protrusions and the fitting pieces having the clamping pieces that clamp the protrusions, the resin housing has a polygonal shape when viewed from a direction along the extension direction, The fastening mechanism is provided on each of different sides of the polygonal shape. 7. The resin casing according to any one of claims 1 to 6. [Explanation of symbols]

[0073] DESCRIPTION OF SYMBOLS 1...plastic housing, 1a...short side, 1A...plastic housing, 1b...long side, 1B...plastic housing, 2...plastic case (first part), 2a...top plate portion (first flat plate portion), 2b...side wall portion (standing plate portion), 2b1...front wall portion, 2b2...rear wall portion, 2b3...left wall portion, 2b4...right wall portion, 2c...projection portion, 2c1...central slit (projection portion slit), 3...plastic cover (second part), 3a...bottom plate portion (second flat plate portion), 3b...mating piece, 20...connector opening, 21...groove portion, 21a...bottom surface (surface), 30...insertion / removal slit, 30a...inclined surface, 30b...narrow portion, 31...clamping piece, 32...left clamping piece, 33...right clamping piece, 40...fastening mechanism, 100...battery management unit

Claims

1. A resin housing having a first part and a second part that are fastened to each other, The first part is A first flat plate portion; an upright plate portion provided upright on a surface of the first flat plate portion; a protrusion protruding from the surface of the standing plate portion; and The second part is a second flat plate portion disposed opposite the first flat plate portion so as to form a gap between the second flat plate portion and the first flat plate portion; a fitting piece that is erected on the surface of the second flat plate portion and is arranged to face the surface of the erect plate portion on which the protrusion portion is provided; and The fitting piece is an insertion / removal slit formed along an extension direction, which is a direction in which the fitting piece extends from the surface of the second flat plate portion, and having one end as an open end, into which the protrusion can be inserted and removed in the extension direction; The protrusion inserted into the insertion / removal slit has a pair of clamping pieces that clamp the protrusion from a direction perpendicular to the direction in which the protrusion protrudes from the surface of the standing plate portion. A resin housing characterized by:

2. 2. The plastic housing according to claim 1, wherein the clamping piece is elastically deformable in a direction perpendicular to a direction in which the protrusion protrudes from the surface of the standing plate portion.

3. 3. The resin housing according to claim 1, wherein the protrusion has a protrusion slit penetrating the protrusion in the extension direction.

4. 3. The resin casing according to claim 1, wherein the protrusion is formed in a cylindrical shape with a peripheral surface that is a contact surface with the clamping piece.

5. the upright plate portion has a groove portion capable of accommodating at least a portion of the fitting piece, The protrusion protrudes from the bottom surface of the groove.

3. The resin housing according to claim 1 or 2.

6. 3. The resin casing according to claim 1, wherein the surface of the upright plate portion on which the protrusion is provided is in contact with a surface of the fitting piece.

7. a plurality of fastening mechanisms including the protrusions and the fitting pieces having the clamping pieces that clamp the protrusions, the resin housing has a polygonal shape when viewed from a direction along the extension direction, The fastening mechanism is provided on each of different sides of the polygonal shape.

3. The resin housing according to claim 1 or 2.

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