JP6476966B2 - Battery pack and fastening structure - Google Patents

Description

  The present invention relates to a battery pack and a fastening structure.

  As a conventional battery pack, for example, there is one described in Patent Document 1. In this conventional battery pack, a plurality of slots for arranging battery modules are provided in the height direction in the housing. The plurality of battery modules are accommodated in the slots such that the first surfaces where the electrodes are positioned in the battery cell and the second surfaces opposite to the first surface are aligned in the height direction.

JP 2013-171796 A

  The case for the battery pack as described above may be configured by fastening the cover portion with a screw member to the bottomed main body portion. On the other hand, the surface of the main body part and the surface of the cover part may be spray-coated with a rust preventive material including an epoxy resin for the purpose of rust prevention.

  Spray coating has advantages in terms of cost, but due to the effect of surface tension, for example, at the opening end of the screw hole in the main body part or the opening end of the insertion hole in the cover part, a swelled part (thickness other than the film thickness) There is a problem that a portion that becomes larger than the region of (1) occurs. When the body and cover are fastened with screw members in the presence of a raised part of the coating film, the raised part gradually collapses due to the persistence of the fastening force, and the tightening force of the screw member decreases with time. There is a risk that.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a battery pack and a fastening structure that can maintain a fastening force by a screw member at a low cost.

  In order to solve the above-described problem, a battery pack according to one aspect is a battery pack in which one or a plurality of battery modules are accommodated in a housing, and the housing fastens a cover portion to the main body portion by a screw member. The body portion is formed with a screw hole into which the shaft portion of the screw member is screwed, and the cover portion is formed with an insertion hole through which the shaft portion of the screw member is inserted. And the surface of the cover part is provided with a spray coating film formed by spray coating, and between the main body part and the cover part, a rising part of the spray coating film formed around the insertion hole of the cover part, A spacer is disposed to be separated from the spray coating film formed on the surface of the main body.

  In this battery pack, a spray coating film formed by spray coating is provided on the surface of the main body and the surface of the cover. In spray coating, a raised portion of the coating film may be formed around the opening end of the screw hole or around the opening end of the insertion hole. On the other hand, in this battery pack, a spacer is disposed between the main body portion and the cover portion, and the rising portion of the spray coating film formed around the insertion hole of the cover portion is formed on the surface of the main body portion. It will be in the state separated from the coating film. For this reason, since the temporal change of the film thickness of the spray coating film after fastening the screw member is suppressed, the tightening force of the screw member can be maintained. Moreover, the cost of the battery pack can be reduced by using an inexpensive spray coating for the main body and the cover.

  Also, the inner diameter of the screw hole and the inner diameter of the insertion hole are substantially the same diameter, and the thickness of the spacer is the height of the raised portion of the spray coating film formed around the screw hole of the main body part and the insertion hole of the cover part It may be greater than or equal to the sum of the height of the raised portion of the spray coating film formed around. According to this configuration, the swelled portion of the spray coating film formed around the screw hole of the main body portion and the swelled portion of the spray coating film formed around the insertion hole of the cover portion hit each other and are crushed together. Can be prevented.

  The insertion hole has a larger diameter than the raised portion of the spray coating film formed around the opening end of the screw hole, and the thickness of the spacer is the spray coating film formed around the insertion hole of the cover portion. It may be higher than the height of the bulge. According to this configuration, the swelled portion of the spray coating film formed around the screw hole of the main body portion and the swelled portion of the spray coating film formed around the insertion hole of the cover portion hit each other and are crushed together. Can be prevented.

  Moreover, the spacer may have a spacer main body that is annularly disposed around the screw hole and the insertion hole, and a positioning portion that positions the spacer main body with respect to the screw hole and the insertion hole. By the positioning part, it is possible to prevent the spacer from being arranged in contact with the raised portion of the spray coating film.

  The positioning portion is constituted by a disc portion having a through hole having an inner diameter substantially equal to the outer diameter of the shaft portion of the screw member. By passing the shaft portion of the screw member through the through hole, the spacer main body portion with respect to the screw hole and the insertion hole May be positioned. In this case, the spacer can be positioned with a simple configuration in which the shaft portion of the screw member is passed through the through hole.

  The positioning part may be constituted by a claw part that is thinner than the spacer body part, and the spacer body part may be positioned with respect to the screw hole and the insertion hole by the claw part coming into contact with the shaft part of the screw member. In this case, the spacer can be positioned with a simple configuration in which the claw portion is brought into contact with the shaft portion of the screw member.

  On the proximal end side of the shaft portion in the screw member, a large diameter portion having a thickness larger than that of the shaft portion may be provided with a thickness that does not contact the raised portion of the spray coating film. In this case, the screw member can be easily positioned with respect to the insertion hole. Moreover, even when vibration is applied to the battery pack, the screw member can be prevented from being loosened.

  The fastening structure according to one aspect is a fastening structure in which a cover portion is fastened to a main body portion by a screw member, and a screw hole into which a shaft portion of the screw member is screwed is formed in the main body portion. The part is provided with an insertion hole through which the shaft part of the screw member is inserted, and a spray coating film formed by spray coating is provided on the surface of the main body part and the surface of the cover part. In this case, there is disposed a spacer that separates the rising portion of the spray coating film formed around the insertion hole of the cover portion from the spray coating film formed on the surface of the main body portion.

  In this fastening structure, a spray coating film formed by spray coating is provided on the surface of the main body and the surface of the cover. In spray coating, a raised portion of the coating film may be formed around the opening end of the screw hole or around the opening end of the insertion hole. On the other hand, in this fastening structure, a spacer is arranged between the main body part and the cover part, and the rising part of the spray coating film formed around the insertion hole of the cover part is formed on the surface of the main body part. It will be in the state separated from the coating film. For this reason, since the temporal change of the film thickness of the spray coating film after fastening the screw member is suppressed, the tightening force of the screw member can be maintained. Moreover, the cost of the fastening structure can be reduced by making the coating of the main body part and the cover part an inexpensive spray coating.

  According to the battery pack and the fastening structure, the fastening force by the screw member can be maintained at a low cost.

It is a perspective view which shows one Embodiment of a battery pack. It is sectional drawing which shows the fastening structure of the main-body part and cover member in the housing | casing of the battery pack shown in FIG. It is a top view which shows the structure of a spacer. It is a principal part expanded sectional view which shows the fastening structure which concerns on a comparative example. It is a principal part expanded sectional view which shows the fastening structure which concerns on an Example. It is a principal part expanded sectional view which shows the fastening structure which concerns on a modification. It is a principal part expanded sectional view which shows the fastening structure which concerns on another modification.

  Hereinafter, preferred embodiments of a battery pack and a fastening structure will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of a battery pack. As shown in FIG. 1, the battery pack 1 accommodates one or a plurality of battery modules 3 in a housing 2 and is configured as a vehicle battery, for example. The battery module 3 is formed by electrically connecting a plurality of battery cells 4 to each other. In the present embodiment, the battery modules 3 are respectively arranged in slots (not shown) provided in a 2 × 2 matrix in the housing 2. The battery cell 4 is a storage battery such as a lithium ion secondary battery, or an electric double layer capacitor. The battery cell 4 is configured by housing an electrode assembly in which a negative electrode, a separator, and a positive electrode are stacked in a case in which an electrolytic solution is injected.

  The housing 2 includes a main body part 11 and a flat cover part 12 that closes the opening 20 of the main body part 11, and has a substantially rectangular parallelepiped shape as a whole. Examples of the material forming the housing 2, that is, the material forming the main body 11 and the cover 12, include a metal material such as iron (SS400).

  The main body 11 includes a base plate 13 and side plates 14 provided on each of the four sides of the base plate 13. The base plate 13 and the side plate 14 are each formed of a rectangular flat plate member, and the main body 11 is formed by welding the edge of the side plate 14 to the edge of the base plate 13. The cover portion 12 is made of a rectangular flat plate member having the same shape as the base plate 13. The cover portion 12 is fixed to an end surface of the side plate 14 on the opening portion 20 side by a screw member 15 such as a bolt and closes the opening portion 20.

  Next, a fastening structure between the main body 11 and the cover 12 in the housing 2 will be described in detail.

  FIG. 2 is a cross-sectional view illustrating a fastening structure between the main body portion and the cover portion. As shown in the drawing, in the fastening structure 21, a screw hole 22 into which the shaft portion 16 of the screw member 15 is screwed is formed in the main body portion 11. The screw hole 22 is formed in a circular cross section in the thickness direction of the main body part 11 from the outer surface 11a (end face of the side plate 14: see FIG. 1) side of the main body part 11. Further, a spray coating film 23 formed by spray coating is formed on the outer surface 11 a of the main body 11 and the inner surface 22 a of the screw hole 22. Examples of spray coating include a spray method. Examples of the material for forming the spray coating film 23 include a rust preventive material containing an epoxy resin and a rust preventive material containing a polyurethane resin. Moreover, the thickness of the spray coating film | membrane 23 is 10 micrometers-40 micrometers, for example.

  An insertion hole 24 through which the shaft portion 16 of the screw member 15 is inserted is formed in the cover portion 12. The insertion hole 24 penetrates in the thickness direction of the cover part 12 so as to extend from the inner surface 12a to the outer surface 12b of the cover part 12, and is formed in a circular cross section. Similar to the spray coating film 23, a spray coating film 25 formed by spray coating is formed on the inner surface 12 a and the outer surface 12 b of the cover portion 12 and the inner surface 24 a of the insertion hole 24. Examples of the material for forming the spray coating film 25 include a rust preventive material containing an epoxy resin and a rust preventive material containing a polyurethane resin. Moreover, the thickness of the spray coating film | membrane 25 is 10 micrometers-40 micrometers, for example.

  The inner diameter of the insertion hole 24 is larger than the inner diameter of the screw hole 22. More specifically, the inner diameter of the insertion hole 24 is formed larger than the diameter of the rising portion R (see FIG. 5) of the spray coating film 23 formed around the opening end 22b of the screw hole 22. The rising portion R of the spray coating film 23 will be described later. As shown in FIG. 2, the inner diameter of the screw hole 22 refers to the inner diameter W1 in consideration of the thickness of the spray coating film 23 formed on the inner surface 22a, and the inner diameter of the insertion hole 24 refers to the inner surface 24a. The inner diameter W2 is taken into consideration in consideration of the thickness of the spray coating film 25 formed in (1).

  A spacer S is disposed between the main body 11 and the cover 12. FIG. 3 is a plan view showing the configuration of the spacer. In the figure, the cover 12 and the screw member 15 are removed, and the spacer S located on the main body 11 is shown. As shown in FIG. 3, the spacer S is comprised by the spacer main-body part Sa formed in the annular | circular shape with metal materials, such as iron, for example. For example, an adhesive tape is used for coupling the spacer S to the main body 11 and the cover 12. The surface of the spacer S is preferably subjected to a rust prevention treatment by, for example, zinc plating.

  The thickness V of the spacer body Sa is equal to or greater than the height Ra of the raised portion R of the spray coating film 25 formed around the insertion hole 24 on the inner surface 12a side of the cover portion 12. Here, the height Ra of the raised portion R is determined by the flat portion of the spray coating film 25 on the inner surface 12a of the cover portion 12 and the inner surface 12a of the insertion hole 24 in the normal direction of the flat portion (longitudinal direction of the shaft portion 16). This is the distance from the apex portion of the raised portion R formed around the opening end 24b on the side (see FIG. 5).

  The inner radius K1 of the spacer body Sa is sufficiently larger than the inner diameter W2 of the insertion hole 24. The inner radius K1 is set so that at least the spacer main body portion Sa overlaps with the seating surface 17a of the screw member 15 in a plan view of the fastening structure 21 (when viewed from the axial direction of the screw member 15). . The width of the spacer main body Sa (the difference between the outer radius K2 and the inner radius K1 of the spacer S) is not particularly limited, but the main body 11 and the cover are not so large that the seat surface is not depressed when the screw member 15 is fastened. It is preferable that a contact area with the portion 12 can be secured.

  The screw member 15 is formed of a metal material such as iron, for example, and has a shaft portion 16 and a head portion 17. The distal end side of the shaft portion 16 has an outer diameter substantially equal to the inner diameter of the screw hole 22, and a screw groove 16 a that is screwed into the screw hole 22 is formed on the peripheral surface. Further, a larger diameter portion 18 having a larger diameter than the distal end side is provided on the proximal end side of the shaft portion 16. The outer diameter W <b> 3 of the enlarged diameter portion 18 is larger than the outer diameter W <b> 4 (see FIG. 5) of the raised portion R of the spray coating film 23 and smaller than the inner diameter W <b> 2 of the insertion hole 24.

  The thickness (length in the longitudinal direction of the shaft portion 16) T of the enlarged diameter portion 18 is appropriately set within a range in which the enlarged diameter portion 18 does not contact the raised portion R. That is, the thickness T of the enlarged diameter portion 18 is equal to the thickness of the cover portion 12 and the spray coating film 25 on the inner surface 12a when the enlarged diameter portion 18 is formed from the position of the seat surface 17a of the screw member 15. The thickness is less than the value obtained by subtracting the height of the raised portion R of the spray coating film 23 from the sum of the thickness of the spray coating film 25 on the outer surface 12b and the thickness of the spacer S. The height of the raised portion R here is the flat portion of the spray coating film 23 on the outer surface 11a of the main body 11 and the opening end 22b of the screw hole 22 in the normal direction of the flat portion (longitudinal direction of the shaft portion 16). This is the distance from the apex of the raised portion R formed around (see FIG. 5).

  In the fastening structure 21 described above, the screw member 15 is passed through the screw hole 22 and the insertion hole 24 in a state where the screw hole 22 and the insertion hole 24 are aligned, and the screw groove 16 a of the shaft portion 16 is screwed into the screw hole 22. Thus, the cover portion 12 is firmly fixed to the main body portion 11. In this state, the seat surface 17a of the screw member 15 abuts on the outer surface 12b of the cover portion 12 on which the spray coating film 25 is formed around the opening end 24b on the outer surface 12b side in the insertion hole 24, and the large diameter of the shaft portion 16 is reached. The conversion portion 18 is located in the insertion hole 24 so as not to contact the raised portion R of the spray coating film 23.

  Then, the effect of the fastening structure 21 of the battery pack 1 mentioned above is demonstrated.

  FIG. 4 is an enlarged cross-sectional view of a main part showing a fastening structure according to a comparative example. As shown in the figure, the fastening structure 121 according to the comparative example includes a surface of the main body 111 (the outer surface 111a and the inner surface 122a of the screw hole 122) and a surface of the cover portion 112 (the inner surface 112a, the outer surface 112b, and the insertion hole 124). The point that the spray coating film 125 is formed on the inner surface 124a) is the same as the embodiment. However, the point that the spacer S is not disposed between the main body 111 and the cover 112 is different from the embodiment. Moreover, the point from which the internal diameter of the penetration hole 124 is not substantially enlarged with respect to the internal diameter of the screw hole 122, and the point by which the enlarged diameter part is not provided in the axial part 116 of the screw member 115 differ from an Example. To do.

  In this fastening structure 121, spray coating is used for both the coating of the surface of the main body 111 and the coating of the surface of the cover 112. Although spray coating has an advantage in terms of cost, the spray coating film 123 is formed at a portion where the cross-sectional shape becomes a corner such as the opening end 122b of the screw hole 122 or the opening ends 124b and 124c of the insertion hole 124 due to the influence of surface tension. In some cases, a swelled portion (a portion where the film thickness becomes larger than other portions) R is formed in an annular shape.

  For this reason, in the fastening structure 121, as shown in FIG. 4, it is considered that the seat surface 117a of the screw member 115 comes into contact with the raised portion R formed at the opening end 124c on the outer surface 112b side in the insertion hole 124. It is done. In addition, the raised portion R formed around the opening end 124b on the inner surface 112a side of the insertion hole 124 and the raised portion R formed around the opening end 122b of the screw hole 122 come into contact with each other. It is also conceivable that a gap is easily formed between the two.

  It is considered that the raised portion R formed around the opening end 124c of the insertion hole 124 is crushed to some extent when the seat surface 17a hits when the screw member 115 is fastened. However, the raised portion R formed around the open end 122b of the screw hole 122 and the raised portion R formed around the open end 124b of the insertion hole 124 are likely to remain even after the screw member 115 is fastened. The fastening force of the screw member 115 is locally applied to these raised portions R. For this reason, there exists a possibility that the swell part R may collapse gradually by applying fastening force continuously. If these raised portions R are crushed after the screw member 115 is fastened, the tightening force by the screw member 115 decreases with time, which causes the screw member 115 to loosen.

  On the other hand, FIG. 5 is a principal part expanded sectional view which shows the fastening structure based on an Example. As shown in the figure, in the fastening structure 21, the spacer S is disposed between the main body portion 11 and the cover portion 12, and the spray coating film 25 formed around the opening end 24 b on the inner surface 12 a side in the insertion hole 24. The raised portion R is in a state of being separated from the raised portion R of the spray coating film 23 formed around the opening end 22 b of the screw hole 22.

  In this way, the rising portion R of the spray coating film 23 between the main body portion 11 and the cover portion 12 and the rising portion R of the spray coating film 25 are separated by the spacer S, so that the rising portion R is locally applied to the rising portion R. It can suppress that fastening force is added. Therefore, the change with time of the film thickness of the spray coating films 23 and 25 after the screw member 15 is fastened can be suppressed, and the tightening force of the screw member 15 can be maintained. Moreover, the cost reduction of the battery pack 1 is achieved by making the coating of the main body part 11 and the cover part 12 into an inexpensive spray coating.

  Furthermore, in the fastening structure 21, the inner diameter W <b> 2 of the insertion hole 24 is larger than the outer diameter W <b> 4 of the raised portion R of the spray coating film 23 formed around the opening end 22 b of the screw hole 22. Further, the thickness V of the spacer main body Sa is equal to or higher than the height Ra of the raised portion R of the spray coating film 23 formed around the opening end 24b on the inner surface 12a side in the insertion hole 24c of the cover portion 12.

  According to this configuration, the inner diameter W <b> 2 of the insertion hole 24 is larger than the outer diameter W <b> 4 of the raised portion R of the spray coating film 23, so that the main body portion 11, the cover portion 12, The swelled portion R of the spray coating film 23 and the swelled portion R of the spray coating film 25 are positioned so as not to overlap each other. Therefore, it is possible to prevent the rising portions R and R from hitting each other. Further, by setting the thickness V of the spacer main body portion Sa to be equal to or higher than the height Ra of the rising portion R of the spray coating film 23, the rising portion R is prevented from colliding with the spray coating film 23 on the main body portion 11 side. it can.

  Further, in the fastening structure 21, a large diameter portion 18 having an outer diameter W <b> 3 that is larger than the outer diameter W <b> 4 of the raised portion R of the spray coating film 23 is provided on the proximal end side of the shaft portion 16 in the screw member 15. Is provided. Accordingly, even when the insertion hole 24 has a larger diameter than the screw hole 22, the screw member 15 can be easily positioned with respect to the insertion hole 24.

  FIG. 6 is an enlarged cross-sectional view of a main part showing a fastening structure according to a modification. As shown in the figure, the fastening structure 31 according to this modification differs from the above embodiment in that the inner diameter W1 of the screw hole 22 and the inner diameter W2 of the insertion hole 24 are substantially the same diameter. In this fastening structure 31, the rising portion R of the spray coating film 23 and the rising portion of the spray coating film 25 between the main body 11 and the cover portion 12 in a plan view (when viewed from the axial direction of the screw member 15). R is positioned so as to overlap each other.

  On the other hand, in the fastening structure 31, the thickness V of the spacer body Sa is larger than that in the above embodiment. More specifically, the thickness V of the spacer body portion Sa is determined by the height Rb of the raised portion R of the spray coating film 23 formed around the opening end 22b of the screw hole 22 of the body portion 11 and the cover portion 12. It is more than the sum of the height Ra of the raised portion R of the spray coating film 25 formed around the opening end 24 b of the insertion hole 24.

  Therefore, even if the swelled portion R of the spray coating film 23 and the swelled portion R of the spray coating film 25 are positioned so as to overlap with each other in plan view, the swelled portions R and R will hit each other and will be crushed. Can be prevented. Further, in this fastening structure 31, since the inner diameter W1 of the screw hole 22 and the inner diameter W2 of the insertion hole 24 are substantially the same diameter, it is not necessary to provide the enlarged diameter portion 18 in the screw member 15, and the structure is simple. Is achieved.

  FIG. 7 is an enlarged cross-sectional view of a main part showing a fastening structure according to another modification. As shown in the figure, in the fastening structure 41 according to this modification, the spacer S further includes a positioning portion Sb for positioning the spacer main body portion Sa with respect to the screw hole 22 and the insertion hole 24. It is different from the embodiment.

  More specifically, the positioning portion Sb is configured by a disc portion having an outer diameter substantially equal to the inner diameter of the spacer body portion Sa, and is provided concentrically with the spacer body portion Sa on the inner edge side of the annular spacer body portion Sa. It has been. An insertion hole Sc having an inner diameter substantially equal to the outer diameter of the shaft portion 16 of the screw member 15 is provided at the center of the positioning portion Sb. Therefore, when the shaft portion 16 of the screw member 15 is inserted through the insertion hole Sc of the positioning portion Sb, the position of the spacer body portion Sa relative to the shaft portion 16 is regulated by the inner surface of the insertion hole Sc, and the screw hole 22 and the insertion hole 24 are On the other hand, the spacer main body Sa is positioned.

  According to the fastening structure 41, the positioning portion Sb can prevent the spacer S from being disposed in contact with the raised portion R of the spray coating films 23 and 25. Further, the spacer S can be positioned with a simple configuration in which the shaft portion 16 of the screw member 15 is passed through the insertion hole Sc.

  In addition, the thickness of the positioning part Sb is thinner than the spacer main body part Sa. That is, the thickness of the positioning portion Sb is determined from the thickness V of the spacer body portion Sa, the height Rb of the raised portion R of the spray coating film 23 formed around the opening end 22b of the screw hole 22, and the insertion hole 24. The thickness is equal to or smaller than the height Ra of the raised portion R of the spray coating film 25 formed around the opening end 24b.

  In the present embodiment, the positioning portion Sb is formed integrally with the spacer main body Sa by cutting the central portion of the metallic disk member forming the spacer main body Sa into a circle from one side and the other side. The spacer main body portion Sa is located at the central portion in the thickness direction. Therefore, the positioning portion Sb does not come into contact with the raised portion R of the spray coating films 23 and 25 between the main body portion 11 and the cover portion 12. In addition, when the positioning part Sb has elasticity, the positioning part Sb and the raised part R may contact.

  In the fastening structure 41 shown in FIG. 7, the inner diameter W <b> 2 of the insertion hole 24 is larger than the outer diameter W <b> 4 of the raised portion R of the spray coating film 23 formed around the opening end 22 b of the screw hole 22. 6, the inner diameter W1 of the screw hole 22 and the inner diameter W2 of the insertion hole 24 may be substantially the same diameter. Further, the positioning portion Sb is not limited to a disc shape, and may be a claw portion extending from the inner edge of the spacer main body portion Sa toward the center side, for example. By providing at least two such claw portions and bringing the shaft portion 16 of the screw member 15 into contact with the tip of the claw portion, the spacer S can be positioned with a simple configuration. The positioning part Sb may be in contact with the enlarged diameter part 18.

  For example, when the thickness V of the spacer main body Sa is thick, the positioning portion extending from the spacer main body Sa is increased by increasing the thickness T of the rising and increasing diameter portion 18 so as to be slightly separated from the rising portion R of the spray coating film 23. You may make it contact Sb with the outer peripheral surface of the enlarged diameter part 18. FIG. In this case, the positioning accuracy can be improved as compared with the case where the positioning portion Sb is positioned with respect to the shaft portion 16 of the screw member 15.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the enlarged diameter portion 18 of the shaft portion 16 in the screw member 15 is provided so as to contact the seat surface 17a. However, the enlarged diameter portion 18 may be separated from the seat surface 17a. Good. Moreover, in the said embodiment, although the spray coating film | membrane 23 is formed in the inner surface 22a of the screw hole 22 of the main-body part 11, the spray coating film | membrane 23 is not formed in the inner surface 22a of the screw hole 22 by masking etc. You may do it. The screw hole 22 may be a through hole.

  Furthermore, in the said embodiment, although the annular | circular shaped spacer main-body part Sa was illustrated, the spacer main-body part Sa is not restricted to a cyclic | annular form, You may be cyclic | annular with a rectangle, a triangle, etc. Further, the configuration is not limited to a continuous shape, and a configuration in which a plurality of spacer main body portions Sa are arranged around the screw hole 22 in an annular shape may be employed.

  DESCRIPTION OF SYMBOLS 1 ... Battery pack, 2 ... Housing | casing, 3 ... Battery module, 11 ... Main-body part, 12 ... Cover part, 15 ... Screw member, 16 ... Shaft part, 17a ... Seat surface, 18 ... Large diameter part, 21, 31 , 41 ... Fastening structure, 22 ... Screw hole, 22b ... Open end, 23, 25 ... Spray coating film, 24 ... Insertion hole, R ... Swelling part, S ... Spacer, Sa ... Spacer main body part, Sb ... Positioning part.

Claims (8)

A battery pack containing one or a plurality of battery modules in a housing,
The housing is configured by fastening a cover portion to the main body portion with a screw member,
The body portion is formed with a screw hole into which the shaft portion of the screw member is screwed, and the cover portion is formed with an insertion hole through which the shaft portion of the screw member is inserted,
A spray coating film formed by spray coating is provided on the surface of the main body portion and the surface of the cover portion,
A rising portion of the spray coating film formed around the insertion hole of the cover portion is separated from the spray coating film formed on the surface of the main body portion between the main body portion and the cover portion. A battery pack in which spacers are arranged. The inner diameter of the screw hole and the inner diameter of the insertion hole are substantially the same diameter,
The thickness of the spacer is such that the height of the raised portion of the spray coating film formed around the screw hole of the main body and the height of the raised portion of the spray coating film formed around the insertion hole of the cover portion. The battery pack according to claim 1, wherein the battery pack is equal to or higher than a total height. The insertion hole has a larger diameter than the raised portion of the spray coating film formed around the opening end of the screw hole,
2. The battery pack according to claim 1, wherein a thickness of the spacer is equal to or greater than a height of a raised portion of the spray coating film formed around the insertion hole of the cover portion.   The spacer includes a spacer main body disposed annularly around the screw hole and the insertion hole, and a positioning portion that positions the spacer main body with respect to the screw hole and the insertion hole. Item 4. The battery pack according to any one of Items 1 to 3. The positioning portion is constituted by a disc portion having a through hole having an inner diameter substantially equal to the outer diameter of the shaft portion of the screw member,
The battery pack according to claim 4, wherein the spacer main body is positioned with respect to the screw hole and the insertion hole by passing the shaft portion of the screw member through the through hole. The positioning part is constituted by a claw part thinner than the spacer body part,
The battery pack according to claim 4, wherein the spacer main body is positioned with respect to the screw hole and the insertion hole by the claw portion coming into contact with the shaft portion of the screw member. The base end side of the shaft portion of the screw member, said at not contact the raised portion of the spray coating layer thickness, according to claim 3, wherein the large diameter portion of the large diameter is provided than the shaft portion Battery pack. A fastening structure for fastening the cover part to the main body part by a screw member,
The body portion is formed with a screw hole into which the shaft portion of the screw member is screwed, and the cover portion is formed with an insertion hole through which the shaft portion of the screw member is inserted,
A spray coating film formed by spray coating is provided on the surface of the main body portion and the surface of the cover portion,
A rising portion of the spray coating film formed around the insertion hole of the cover portion is separated from the spray coating film formed on the surface of the main body portion between the main body portion and the cover portion. Fastening structure in which spacers are arranged.

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