JP6540355B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack.

  A battery pack used as a battery of a vehicle, such as an electric car or a forklift, is known. For example, Patent Document 1 discloses a battery pack including a battery module configured to include an array of battery cells, and a housing that houses the battery module. In such a battery pack, the housing is often formed by welding and joining a plurality of members. Thereby, the waterproofness in the case is secured, and the waterproof performance to the battery module is enhanced.

JP, 2014-76887, A

  Among the members constituting the housing, the member to which the battery module is fixed as shown in Patent Document 1 needs a thickness for screwing in a bolt or screw for fixing the battery module to the member Some thickness is required. However, in joining of members by welding, the welding time is longer as the thickness is larger, and the quality of the joint is likely to be different.

  Therefore, an object of the present invention is to provide a battery pack in which it is difficult to cause a difference in the quality of a joint by welding while suppressing an increase in welding time.

  The battery pack of the present invention is a battery pack provided with a battery module composed of a plurality of battery cells, and is provided with a bottomed cylindrical first component in which a plurality of flat plate-shaped first members are joined by welding; The third component includes a second component that covers the opening of the component, and a third component in which the battery module is fixed to one main surface of a flat second member that is thicker than the first component. And an inner space of a housing formed by the first part and the second part joined to the first part.

  In the battery pack of this configuration, the third component, in which the battery module is fixed to the second member having a thickness greater than that of the first member forming the first component, is formed by joining the first component and the second component. It is housed in the internal space of the case. Thereby, the thickness of the first member forming the first component can be made smaller (thin) than the thickness of the second member to which the battery module is fixed. Therefore, compared with the case where the case is formed by welding and joining the members to which the battery module is fixed, the welding time is prevented from becoming longer, and the difference in the quality of the joint by welding is less likely to occur. be able to.

  In the battery pack of the present invention, the thickness of the first member may be 20 mm or less.

  According to the battery pack of this configuration, it is possible to suppress an increase in welding time and to make it difficult to cause a difference in the quality of the joint by welding.

  In the battery pack of the present invention, the second component may be formed of a member smaller in thickness than the second member.

  According to the battery pack of this configuration, even when the second part is formed by welding and joining a plurality of members, and even when the first part and the second part are joined by welding While being able to control welding time, it can be made hard to produce a difference of quality of a joined part by welding.

  In the battery pack of the present invention, the first component has the first bottom portion and the first cylindrical portion erected from the first bottom portion, and the other main surface of the second member is fixed to the first cylindrical portion It may be done.

  In the battery pack of this configuration, the first component and the second member in the third component are fastened by the fastening member from the outside of the casing formed by the first component and the second component. The second member can secure a length to which a fastening member such as a screw is screwed in the thickness direction, so that the third component can be reliably fixed to the first component.

  In the battery pack of the present invention, a through hole penetrating in the thickness direction of the first bottom portion is formed in the first bottom portion, and the through hole may be disposed below the second member in the third component .

  In the battery pack of this configuration, there is a possibility that water may intrude into the housing from the joint between the first component and the second component. Even if water intrudes in this manner, in the above configuration in which the through hole is formed in the first bottom, the water is discharged from the through hole formed in the first bottom. In addition, since the through hole is disposed below the second member in the third part, the water entering from the joint between the first part and the second part is the area where the battery module in the housing is arranged It is possible to prevent reaching to the end.

  In the battery pack of the present invention, the second component has the second bottom portion and the second cylindrical portion erected from the second bottom portion, and the second cylindrical portion is extrapolated to the first cylindrical portion. The second tubular portion and the second member may be fastened by the fastening member in a state in which the first tubular portion is sandwiched.

  According to the battery pack of this configuration, by the second cylindrical portion being extrapolated to the first cylindrical portion, a long approach path into the housing is secured. Thereby, the waterproofness inside a case can be improved.

  In the battery pack of the present invention, the second part has the second bottom and the second cylindrical part erected from the second bottom, and the first part and the second part have the thickness of the first cylindrical part The portion and the thickness portion of the second cylindrical portion may be arranged to be joined.

  According to the battery pack of this configuration, since the first component and the second component do not overlap in the thickness direction, it is possible to prevent the second component from jumping out in the thickness direction.

  In the battery pack of the present invention, the thickness portion of the first cylindrical portion and the thickness portion of the second cylindrical portion may be joined via the seal member.

  According to the battery pack of this configuration, entry of water from the joint between the thickness portion of the first cylindrical portion and the thickness portion of the second cylindrical portion can be suppressed.

  In the battery pack of the present invention, the second component may be fastened to the thickness portion of the second member in the third component by the fastening member.

  According to the battery pack of this configuration, it is possible to prevent the second component from jumping out in the thickness direction of the first cylindrical portion of the first component.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing that welding time becomes long, the difference of the quality of the junction part by welding becomes difficult to produce.

It is a perspective view showing a battery pack concerning this embodiment. It is sectional drawing seen from the II-II line of the battery pack of FIG. It is a perspective view which shows the battery module of FIG. (A) is a perspective view which shows the cell holder of the state holding the battery cell, (b) is a perspective view which shows the cell holder of the state which does not hold a battery cell. It is the top view seen from Z-axis direction at the time of attaching the battery module of FIG. 3 to a base board. It is the disassembled perspective view which showed how to assemble the battery pack of FIG. It is sectional drawing seen from the II-II line of the battery pack which concerns on the modification 1. FIG. FIG. 12 is a cross-sectional view of a battery pack according to Modified Example 2 as seen from line II-II.

  Hereinafter, a battery pack 1 according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. The dimensional proportions in the drawings do not necessarily coincide with those in the description. Further, in the description, words indicating directions such as “upper” and “lower” are convenient words based on the states shown in the drawings.

  As shown in FIG. 1 and FIG. 2, the battery pack 1 is a lid part joined so as to cover the opening 3 a of the bottomed cylindrical box-like part (first part) 3 and the box-like part 3 ( And a subassembly (third component) 7 accommodated in the internal space S1 of the casing 10 and to which the battery module 20 is fixed. In the drawings used for describing the present embodiment, such as FIG. 1, only the subassembly 7 to which the battery module 20 accommodated in the internal space S1 of the housing 10 is fixed is illustrated, and wiring, control equipment, etc. Other components are omitted.

  The box-like part 3 is a square plate-like bottom plate (first member / first bottom) 4a, and a square plate-like front plate (first member / first cylindrical portion) 4b erected from the periphery of the bottom plate 4a, It has a rear plate (first member and first cylindrical portion) 4c and a pair of side plates (first member and first cylindrical portion) 4d. The bottom plate 4a, the front plate 4b, and the back plates 4c and 4d are thin plates having a thickness of, for example, 1 mm to 20 mm (preferably 1 mm to 10 mm), and are formed into a bottomed cylindrical shape by welding to each other. ing. The thickness of the bottom plate 4a, the front plate 4b, and the back plates 4c and 4d of the present embodiment is 6.0 mm. The material of the thin plate forming the box-like part 3 is, for example, a steel material such as SS400.

  The lid part 6 includes a quadrangular plate-like lid plate (first member / second bottom) 6a and four quadrangular plate-like side plates (first member / second cylindrical portion) erected from the periphery of the lid plate 6a. And 6b). The lid plate 6a and the side plate 6b are the same thin plates as those used for the box-like part 3 and have a thickness of, for example, 1 mm to 20 mm (preferably 1 mm to 10 mm). It is formed in a tubular shape. The thickness of the cover plate 6 a and the side plate 6 b of the present embodiment is 6.0 mm, which is the same as the member forming the box-like part 3.

  The subassembly 7 has a plurality of (four in the present embodiment) battery modules 20 and a base plate (second member) 8 to which the battery modules 20 are fixed. The two subassemblies 7 are accommodated in the internal space S1 of the housing 10. The base plate 8 is a thick plate thicker than members forming the box-like part 3 and the lid part 6, and its thickness can be, for example, 10 mm or more. The thickness of the base plate of the present embodiment is 20.0 mm. The material of the thin plate forming the box-like part 3 is, for example, steel such as SS400 or cast iron. The battery module 20 is fixed to one main surface 8 a of the base plate 8.

  In the subassembly 7, the other main surface 8 b of the base plate 8 is fixed to the box-like part 3. Specifically, two insertion holes 5b for inserting screws (fastening members) 9a and eight insertion holes for inserting screws (fastening members) 9b in the side plates 4d and 4d of the box-like part 3 A plurality of 5b are provided. Further, in the base plate 8, there are formed two screw holes (female screw) 8c in which a screw groove capable of screwing the screw 9a is formed and eight screw holes in which a screw groove capable of screwing the screw 9b is formed ( Female screw) 8c is formed. Further, two insertion holes 6c for inserting the screws 9a are formed in the pair of side plates 6b, 6b facing each other in the lid part 6.

  In the base plate 8, the screw 9b inserted into the insertion hole 5b from the outside of the pair of side plates 4d of the box-like part 3 is screwed into the screw hole 8c formed in the other main surface 8b of the base plate 8. Fixed by Further, in the base plate 8, the screw 9a inserted into the insertion hole 6c from the outside of the pair of side plates 6b and 6b of the lid part 6 is inserted into the insertion hole 5b of the side plate 4d. It is fixed by being screwed into the screw hole 8c formed in.

  In the box-like part 3, as shown in FIG. 2, a through hole 5a for draining water which penetrates in the thickness direction (Z-axis direction) of the bottom plate 4a is formed in the square plate-like bottom plate 4a. The through hole 5 a is disposed below the base plate 8 in the subassembly 7. In other words, when the base plate 8 is brought into contact with the bottom plate 4a with the subassembly 7 housed in the housing 10, the side plate 4d to which the base plate 8 is attached from the contact position (or projection position) of the thick portion 8d. It may be formed between the The arrangement position of the through hole 5a is not particularly limited in the X axis direction. The number of the through holes 5a is determined in consideration of, for example, the strength of the housing 10 and the drainage function.

  Next, the battery module 20 fixed to the subassembly 7 will be described. As shown in FIG. 3, in the battery module 20, one side of the array 15 formed by arranging a plurality of battery cells 11 in the state of being held by the cell holder 21 and the array direction of the array 15 (X axis direction) A plurality of elastic members 31 (see FIG. 5) disposed, a pair of brackets 41 disposed on both sides in the arrangement direction with respect to the array 15 and the elastic members 31, and a plurality of brackets 41 coupled to each other And a middle plate 61 (see FIG. 5) disposed between the array 15 and the elastic member 31.

  The battery cell 11 shown in FIG. 4A is a battery in which an electrode assembly is housed in a rectangular box-shaped case, and is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. As shown in FIG. 3, in the present embodiment, seven battery cells 11 are arranged. The battery cells 11 are arranged in a state of being held by the cell holder 21. Adjacent battery cells 11 are in close contact with each other via a heat transfer plate (not shown). The electrode terminals 13 of the adjacent battery cells 11 are electrically connected to each other by the bus bar 14, whereby the adjacent battery cells 11 are electrically connected in series. An array 15 is configured by the battery cells 11, the cell holders 21, the heat transfer plate, and the bus bars 14.

  The cell holder 21 is formed of resin. As shown in FIGS. 4 (a) and 4 (b), the cell holder 21 has a frame portion 22 and a partition portion 23. The frame portion 22 includes a bottom plate 24 and a pair of side plates 25 rising from both ends of the bottom plate 24. At each end of the bottom plate 24, a protrusion 24a protruding in the thickness direction of the bottom plate 24 is provided, and in each of the protrusions 24a, an insertion hole 24b penetrating in the arrangement direction is provided. The bolt 51 (see FIG. 3) is inserted into each of the insertion holes 24b.

  The partition portion 23 connects the pair of side plates 25, 25 to each other. A pair of terminal accommodating portions 26, 26 is provided on the partition portion 23. Each of the pair of terminal accommodating portions 26 has a circular inner wall surrounding the electrode terminal 13. Further, on the partition portion 23, a pair of square pillars 27, 27 are provided. Each of the pair of pillars 27, 27 is provided with an insertion hole 27a penetrating in the arrangement direction. The diameter of the insertion hole 27a is, for example, the same as the diameter of the insertion hole 24b. A bolt 51 (see FIG. 3) is inserted into each of the insertion holes 27a.

  In the cell holder 21, a housing space S <b> 2 is formed by the frame portion 22 and the partition portion 23. The battery cell 11 is held in the cell holder 21 by housing the battery cell 11 in the housing space S2. Further, in the cell holder 21, a rectangular opening 28 is formed by the frame 22 and the lower end face of the partition 23. The opening 28 is provided for the arrangement of a heat transfer plate (not shown).

  The elastic member 31 is formed in, for example, a flat plate shape of rubber. As shown in FIG. 5, the elastic member 31 is disposed between the middle plate 61 and the bracket 41. The pair of brackets 41 sandwich the array body 15, the elastic member 31 and the middle plate 61 from both sides in the arrangement direction, and fixes the battery module 20 to the base plate 8 of the subassembly 7.

  The bracket 41 is formed by bending a plate-like member made of a metal material. The bracket 41 is formed with a holding portion 42 and a fixing portion 43 with the bending portion 41 a interposed therebetween. Further, a rib 44 for enhancing the strength is formed on the bracket 41.

  The holding portion 42 is a portion that holds the array body 15 via the elastic member 31 and the middle plate 61. The holding portion 42 is provided with a plurality of (four in this example) insertion holes 42 a for inserting the bolts 51. The fixing portion 43 is a portion fixed to the base plate 8 of the subassembly 7, and is fixed to the base plate 8 by, for example, a screw 55. The fixing portion 43 is provided with a plurality of (four in this example) insertion holes 43 a for inserting the screws 55.

  The bolt 51 is formed of, for example, a relatively high strength iron-based metal. A plurality of (in this example, four) bolts 51 are provided, and extend in the arrangement direction to connect the pair of brackets 41, 41 with each other. Each of the plurality of bolts 51 is inserted into the four insertion holes 42 a formed in the pair of brackets 41 and 41, and is inserted into the insertion hole 24 b or the insertion hole 27 a of the cell holder 21. And it is fastened by the nut 53 outside the one bracket 41. A restraint load is applied to the array 15 and the elastic member 31 by this fastening.

  Next, an example of how to assemble the battery pack 1 will be described with reference to FIG. First, a bottomed cylindrical box-like part 3 as shown in FIG. 6, a lid part 6 joined so as to cover the opening 3a of the box-like part 3, and a battery module 20 fixed to the base plate 8 And the subassembly 7 consisting of Then, the subassembly 7 is inserted from the opening 3 a of the box-like part 3.

  Next, the screw 9 b is inserted into the insertion hole 5 b from the outside of the side plate 4 d of the box-like part 3, and the screw 9 b is screwed into the screw hole 8 c formed in the other main surface 8 b of the base plate 8. Next, the side plate 6b of the lid component 6 is extrapolated to the front plate 4b, the rear plate 4c and the pair of side plates 4d erected from the periphery of the bottom plate 4a in the box-like component 3. The screw 9a is inserted from the outside of the side plate 6b of the lid part 6 from the outside of the side plate 6b and the insertion hole 5b of the side plate 4d of the box-like part 3 into the screw hole 8c formed in the other main surface 8b of the base plate 8. The screw 9a is screwed.

  The subassembly 7 is fixed to the box-like part 3 by the steps described above. Further, a lid part 6 covering the opening 3 a of the box-like part 3 is fixed to the box-like part 3. Thus, the subassembly 7 in which the battery module 20 is fixed is provided in the internal space S1 of the housing 10 including the box-like part 3 and the lid part 6 joined so as to cover the opening 3a of the box-like part 3. Be housed.

  Next, the operation and effect of the battery pack 1 of the above embodiment will be described. In the battery pack 1 of the above embodiment, the subassembly 7 in which the battery module 20 is fixed to the base plate 8 having a thickness greater than that of the bottom plate 4a, the front plate 4b, the rear plate 4c and the pair of side plates 4d forming the box-like part 3. Is accommodated in the internal space S1 of the housing 10 formed by joining the box-like part 3 and the lid part 6. Thereby, the thicknesses of the bottom plate 4a, the front plate 4b, the back plate 4c, and the pair of side plates 4d forming the box-like part 3 are made smaller (thin) compared to the thickness of the base plate 8 to which the battery module 20 is fixed. Can. Therefore, compared with the case where the case is formed by welding and joining the members to which the battery module 20 is fixed, the welding time is prevented from becoming longer and it is difficult to cause the difference in the quality of the joint by welding. can do. That is, it becomes easy to maintain the quality of a welding part uniformly.

  In general, the thinner the member, the higher the adhesion of the coated film after coating because the oxide film is not attached to the surface of the steel material. On the other hand, since a thick steel plate has a thick oxide film and the adhesion between the base material and the oxide film is low, the adhesion of the coating film is low even if it is applied from above. For this reason, by using a thin plate, the adhesion of the coating film can be secured without any special treatment such as removal of the oxide film. In the battery pack 1 of the present embodiment, since the casing 10 composed of the box-like component 3 and the lid component 6 can be formed of a relatively thin material, the adhesion of the coating can be secured and the quality can be enhanced. Can.

  Moreover, in the battery pack 1 of the said embodiment, the cover component 6 is also formed by the member whose thickness is smaller than the base board 8. FIG. Therefore, in the case of forming the cover plate 6a and the side plate 6b by welding, it is possible to suppress an increase in welding time and to make it difficult to cause a difference in the quality of the joint by welding.

  Further, in the battery pack 1 of the above embodiment, the other main surface 8 b of the base plate 8 in the subassembly 7 is fixed to the side plate 4 d of the box-like component 3. Thereby, the box-like component 3 and the base plate 8 in the subassembly 7 are fastened from the outside of the housing 10 by the screws 9 a and 9 b. Since the base plate 8 can secure the length in which the screws 9a and 9b are screwed in the thickness direction, the subassembly 7 can be reliably fixed to the box-like part 3.

  Moreover, in the battery pack 1 of the said embodiment, the through-hole 5a penetrated in the thickness direction of the bottom plate 4a is formed in the bottom plate 4a of the box-like component 3. As shown in FIG. Thereby, even if water intrudes into the inside of the housing 10, the water is discharged from the through hole 5a formed in the bottom plate 4a. Further, since the through holes 5 a are disposed below the base plate 8, the battery module 20 in the housing 10 is disposed with the water that has entered from the joint portion between the box-like component 3 and the lid component 6. It can prevent reaching the area.

  Further, in the battery pack 1 of the above embodiment, the side plate 6b of the lid component 6 is extrapolated to the front plate 4b, the rear plate 4c and the pair of side plates 4d erected from the periphery of the bottom plate 4a in the box-like component 3. The side plate 6b and the base plate 8 are fastened by screws 9a in a state in which the side plate 4d is sandwiched. As a result, a long approach path to the inside of the housing 10 is secured, so the waterproofness inside the housing 10 can be enhanced.

  As mentioned above, although one Embodiment was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention.

<Modification 1>
In the battery pack 1 of the above embodiment, an example in which the side plate 6b of the lid component 6 is extrapolated to the front plate 4b, the rear plate 4c and the pair of side plates 4d erected from the periphery of the bottom plate 4a in the box-like component 3 is given. However, the present invention is not limited thereto. For example, as shown in FIG. 7, in the box-like part 3, thick portions 4 e of the front plate 4 b, the rear plate 4 c and the pair of side plates 4 d erected from the periphery of the bottom plate 4 a. The battery pack 101 may be configured such that the thickness portions 6 d of the four square plate-like side plates 6 b erected from the peripheral edge are joined via the seal member 70.

  In the battery pack 101 according to the modification 1, the screw 9b is inserted into the insertion hole 5b from the outside of the side plate 4d of the box-like component 3 and the screw 9b is formed in the screw hole 8c formed in the other main surface 8b of the base plate 8. Screw in the Next, the side plate 6 b of the lid part 6 is extrapolated to the base plate 8 of the subassembly 7. The screw 9a is inserted from the outside of the side plate 6b of the lid part 6 from the outside of the side plate 6b and the insertion hole 5b of the side plate 4d of the box-like part 3 into the screw hole 8c formed in the other main surface 8b of the base plate 8. The screw 9a is screwed.

  According to the battery pack 101 of the first modification, the front plate 4b, the rear plate 4c, the pair of side plates 4d erected from the peripheral edge of the bottom plate 4a in the box-like component 3, and the side plates 6b in the lid component 6 are in the thickness direction Does not overlap. For this reason, it is possible to prevent the lid component 6 from jumping out in the thickness direction. Moreover, since the sealing member 70 is arrange | positioned at the junction part of the box-like component 3 and the lid component 6, it can suppress that water approachs from the said junction.

<Modification 2>
In the embodiment and the modification described above, the lid component 6 is described by taking the example including the lid plate 6a and the four side plates 6b erected from the peripheral edge of the lid plate 6a, but the present invention is limited thereto I will not. For example, as illustrated in FIG. 8, as a battery pack 201 having a configuration in which a flat lid component 206 formed only of the lid plate 6 a in the above embodiment is fixed to the thickness portion 8 d of the base plate 8 in the subassembly 7. It is also good.

  Specifically, an insertion hole 206 c for inserting the screw 9 a is formed in the lid plate 206 a of the lid part 206. In the thick portion 8 d of the base plate 8, a screw hole (female screw) 8 c in which a screw groove into which the screw 9 a can be screwed is formed is formed. The lid part 206 is fixed by screwing the screw 9a inserted into the insertion hole 206c from the outside of the lid plate 206a into the screw hole 8c formed in the thick portion 8d of the base plate 8. The lid part 206 is in contact with the front plate 4b and the rear plate 4c erected from the peripheral edge of the bottom plate 4a in the box-like part 3, the thick portions 4e of the pair of side plates 4d, and welded to the box-like part 3 It may be done.

  According to the battery pack 201 of the second modification, the lid part 6 pops out in the thickness direction of the front plate 4b, the rear plate 4c and the pair of side plates 4d erected from the peripheral edge of the bottom plate 4a of the box-like part 3. It can be avoided.

<Other Modifications>
Although the box-like part 3 and the lid part 6 (206) have been described by way of an example in which they are joined by the screw 9a in the above embodiment and the modification, they may be joined by a fastening part such as a rivet. It may be joined by welding or the like.

  Although the above-mentioned embodiment and the above-mentioned modification explained the example which four battery modules 20 were fixed to subassembly 7, for example, even if less than four battery modules 20 or five or more battery modules 20 are fixed. Good. Also, instead of and / or in addition to the battery module 20, a dummy module having a mass close to that of the battery module 20 may be fixed to the subassembly 7.

  Although the said embodiment and the said modification gave and demonstrated the example in which the through-hole 5a for water removal penetrated in the thickness direction of the baseplate 4a in the box-like component 3 was formed, this through-hole 5a is not provided. May be

  In the above embodiment and the modification, the sub-assemblies 7, 7 to which the battery module 20 is fixed are described as being fixed to the side plates 4d, 4d of the first component. However, instead of the side plates 4d, 4d, It may be fixed to the front plate 4 and the rear plate 4c in the first part.

  DESCRIPTION OF SYMBOLS 1, 101, 201 ... Battery pack, 3 ... Box-like component (1st component), 3a ... Opening part, 4a ... Bottom plate (1st member and 1st bottom part) 4b ... Front plate (1st member and 1st cylinder) Part), 4c ... rear plate (first member, first cylindrical portion), 4d side plate (first member, first cylindrical portion), 4e thickness part, 5a ... through hole, 5b ... insertion hole, 6, 206 ... Lid parts (second part), 6a, 206a ... Lid plate (first member, second bottom), 6b ... Side plate (first member, second cylindrical portion), 6c, 206c ... Insertion hole, 6d ... Thickness part (2nd tube portion) 7 subassembly (third part) 8 base plate (second member) 8a main surface 8b other main surface 8d thickness portion 9a, 9b Screw (fastening member), 10: housing, 11: battery cell, 20: battery module, 70: sealing member, S1: internal space.

Claims (9)

A battery pack comprising a battery module consisting of a plurality of battery cells,
A bottomed cylindrical first component formed by welding a plurality of flat plate-shaped first members by welding;
A second part covering the opening of the first part;
A third component in which the battery module is fixed to one main surface of a flat plate-like second member having a thickness greater than that of the first member;
Equipped with
The battery pack, wherein the third component is housed in an internal space of a housing formed by the first component and the second component joined to the first component.   The battery pack according to claim 1, wherein the thickness of the first member is 20 mm or less.   The battery pack according to claim 1, wherein the second component is formed of a member having a smaller thickness than the second member. The first part has a first bottom and a first cylindrical portion erected from the first bottom,
The battery pack according to any one of claims 1 to 3, wherein the other main surface of the second member is fixed to the first cylindrical portion. A through hole is formed in the first bottom portion in the thickness direction of the first bottom portion,
The battery pack according to claim 4, wherein the through hole is disposed below the second member in the third part. The second part has a second bottom and a second cylindrical portion erected from the second bottom,
The second cylindrical portion is extrapolated to the first cylindrical portion,
The battery pack according to claim 4 or 5, wherein the second tubular portion and the second member are fastened by a fastening member in a state in which the first tubular portion is sandwiched. The second part has a second bottom and a second cylindrical portion erected from the second bottom,
The battery pack according to claim 4 or 5, wherein the thickness portion of the first cylindrical portion and the thickness portion of the second cylindrical portion are arranged to be joined.   The battery pack according to claim 7, wherein the thickness portion of the first cylindrical portion and the thickness portion of the second cylindrical portion are joined via a seal member. The battery pack according to any one of claims 1 to 5, wherein the second component is fastened to a thickness portion of the second member of the third component by a fastening member.

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