WO2017026151A1

WO2017026151A1 - Battery pack

Info

Publication number: WO2017026151A1
Application number: PCT/JP2016/064008
Authority: WO
Inventors: 直人守作; 浩生植田; 加藤　崇行
Original assignee: 株式会社豊田自動織機
Priority date: 2015-08-10
Filing date: 2016-05-11
Publication date: 2017-02-16
Also published as: JP2017037773A; JP6540355B2

Abstract

A battery pack (1) is provided with: a bottomed box-shaped tubular component (3) obtained by joining a flat bottom plate (4a), a front plate (4b), a rear plate (4c), and a pair of side plates (4d) by means of welding; a lid component (6) that covers the opening (3a) of the box-shaped component; and a sub-assembly (7) in which battery modules (20) are fixed to one principal surface (8a) of a flat base plate (8) larger in thickness than the bottom plate, the front plate, the rear plate, and the pair of side plates. The sub-assembly is housed in an internal space (S1) of a casing (10) formed by the box-shaped component and the lid component joined to the box-shaped component, and the other principal surface (8b) of the lid component is fixed to the box-shaped component.

Description

Battery pack

The present invention relates to a battery pack.

A battery pack used as a battery mounted on a vehicle such as an electric vehicle or a forklift is known. For example, Patent Literature 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 casing is often formed by welding and joining a plurality of members. Thereby, the waterproofness in a housing | casing is ensured and the waterproof performance with respect to a battery module is improved.

JP 2014-76887 A

Among the members constituting the housing, the member to which the battery module as shown in Patent Document 1 is fixed needs a thickness for screwing a bolt or a screw for fixing the battery module to the member. A certain amount of thickness is required. However, in the joining of members by welding, the thicker the thickness, the longer the welding time, and the difference in the quality of the joined portion tends to occur.

Therefore, an object of the present invention is to provide a battery pack that suppresses a long welding time at the time of joining and is unlikely to cause a difference in quality of a joined part due to welding.

The battery pack which concerns on one side of this invention is a battery pack provided with the battery module which consists of a some battery cell, Comprising: The bottomed cylindrical 1st component by which several flat 1st member is joined by welding. And a second component that covers the opening of the first component, and a third component in which the battery module is fixed to one main surface of the flat plate-like second member that is thicker than the first member, The third component is accommodated in the internal space of the housing formed by the first component and the second component joined to the first component.

In the battery pack having this configuration, the third component in which the battery module is fixed to the second member having a thickness larger 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 housing. Thereby, the thickness of the 1st member which forms 1st components can be made small (thin) compared with the thickness of the 2nd member to which a battery module is fixed. For this reason, as compared with the case where the casing is formed by welding the members to which the battery module is fixed, the welding time at the time of joining is suppressed from being increased, and the difference in the quality of the joined portion by welding is reduced. It can be made difficult to occur.

In one embodiment, the thickness of the first member may be 20 mm or less.

According to the battery pack of this configuration, it is possible to prevent the welding time during joining from becoming long, and to make it difficult to produce a difference in quality of the joint due to welding.

In one embodiment, the second component may be formed of a member having a thickness smaller than that of the second member.

According to the battery pack having this configuration, even when the second part is formed by welding and joining a plurality of members, or even when the first part and the second part are joined by welding. The welding time at the time of joining can be suppressed, and the difference in quality of the joined part by welding can be made difficult to occur.

In one embodiment, the 1st part has the 1st bottom part and the 1st cylinder part standing from the 1st bottom part, and the other principal surface of the 2nd member is being fixed to the 1st cylinder part. May be.

In the battery pack having this configuration, the first component and the second member of the third component are fastened by the fastening member from the outside of the housing formed by the first component and the second component. Since the second member can secure a length for screwing a fastening member such as a screw in the thickness direction, the third component can be securely fixed to the first component.

In one embodiment, 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 with this configuration, water may enter the housing from the joint between the first part and the second part. Even if water permeates in this way, in the above configuration in which the through hole is formed in the first bottom portion, the water is discharged from the through hole formed in the first bottom portion. Moreover, since the through-hole is arrange | positioned under the 2nd member in 3rd components, the area | region where the battery module in a housing | casing is arrange | positioned by the water which permeated from the junction part of 1st component and 2nd component Can be prevented.

In one embodiment, the second component has a second bottom portion and a second cylindrical portion standing from the second bottom portion, and the second cylindrical portion is extrapolated to the first cylindrical portion, The two tube portions and the second member may be fastened by a fastening member with the first tube portion sandwiched therebetween.

According to the battery pack of this configuration, the second tube portion is extrapolated to the first tube portion, thereby ensuring a long intrusion path into the housing. Thereby, the waterproofness inside a housing | casing can be improved.

In one embodiment, the second part has a second bottom part and a second cylinder part standing from the second bottom part, and the first part and the second part are a thickness part of the first cylinder part. You may arrange | position so that the thickness part of a 2nd cylinder part may join.

According to the battery pack having this configuration, the first component and the second component do not overlap in the thickness direction, so that the second component can be prevented from jumping out in the thickness direction.

In one embodiment, the thickness part of the 1st cylinder part and the thickness part of the 2nd cylinder part may be joined via the seal member.

According to the battery pack having this configuration, it is possible to prevent water from entering from the joint portion between the thickness portion of the first tube portion and the thickness portion of the second tube portion.

In one embodiment, the second part may be fastened to the thickness portion of the second member in the third part by a fastening member.

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

According to one aspect of the present invention, it is possible to suppress an increase in welding time at the time of joining, and it is difficult to cause a difference in quality of the joined part by welding.

FIG. 1 is a perspective view showing a battery pack according to the present embodiment. FIG. 2 is a cross-sectional view of the battery pack of FIG. 1 as seen from the line II-II. FIG. 3 is a perspective view showing the battery module of FIG. 4A is a perspective view showing the cell holder in a state where the battery cell is held, and FIG. 4B is a perspective view showing the cell holder in a state where the battery cell is not held. FIG. 5 is a plan view seen from the Z-axis direction when the battery module of FIG. 3 is attached to the base plate. FIG. 6 is an exploded perspective view showing how to assemble the battery pack of FIG. FIG. 7 is a cross-sectional view of the battery pack according to Modification 1 as viewed from the line II-II. FIG. 8 is a cross-sectional view of the battery pack according to Modification 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 are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratio in the drawing does not necessarily match that of the battery pack 1 of the embodiment. Further, in the description, words indicating directions such as “up” and “down” are convenient words based on the state shown in the drawings.

As shown in FIGS. 1 and 2, the battery pack 1 includes a bottomed cylindrical box-shaped part (first part) 3 and a lid part (joint so as to cover the opening 3 a of the box-shaped part 3). And a subassembly (third component) 7 to which the battery module 20 is fixed, which is housed in the internal space S1 of the housing 10. In FIG. 1 and other drawings used to describe the present embodiment, 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 members are omitted.

The box-shaped component 3 includes a square plate-like bottom plate (first member / first bottom portion) 4a, and a square plate-like front plate (first member / first tube portion) 4b erected from the periphery of the bottom plate 4a, It has a rear plate (first member / first tube portion) 4c and a pair of side plates (first member / first tube portion) 4d. The bottom plate 4a, the front plate 4b, and the

rear 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 being joined together by welding. ing. The thicknesses of the bottom plate 4a, the front plate 4b, the

rear plates

4c and 4d in the present embodiment are 6.0 mm. The material of the thin plate which forms the box-shaped component 3 is, for example, a steel material such as SS400.

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

The subassembly 7 has a plurality (four in this embodiment) of battery modules 20 and a base plate (second member) 8 to which the battery modules 20 are fixed. Two subassemblies 7 are accommodated in the internal space S <b> 1 of the housing 10. The base plate 8 is a thick plate that is thicker than the members that form the box-shaped component 3 and the lid component 6, and the thickness thereof can be, for example, 10 mm or more. The thickness of the base plate of this embodiment is 20 mm. The material of the thin plate forming the box-shaped part 3 is, for example, a steel material 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 8b of the base plate 8 is fixed to the box-shaped component 3. Specifically, in the

side plates

4d and 4d of the box-shaped component 3, two insertion holes 5b for inserting screws (fastening members) 9a and eight insertion holes for inserting screws (fastening members) 9b are inserted. 5b are provided. The base plate 8 has two screw holes (female screws) 8c in which screw grooves 9a can be screwed and eight screw holes (screw holes in which screw screws 9b can be screwed) ( Female screw) 8c. Moreover, two insertion holes 6c for inserting screws 9a are formed in the pair of

side plates

6b, 6b facing each other in the lid component 6.

In the base plate 8, a screw 9 b inserted into the insertion hole 5 b from the outside of the pair of

side plates

4 d and 4 d in the box-shaped component 3 is screwed into a screw hole 8 c formed in the other main surface 8 b of the base plate 8. Fixed by. The base plate 8 has a screw 9a inserted through the insertion hole 6c from the outside of the pair of

side plates

6b, 6b in the lid component 6 and 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 the.

As shown in FIG. 2, the box-shaped component 3 has a square plate-like bottom plate 4 a formed with a through hole 5 a for draining water that penetrates in the thickness direction (Z-axis direction) of the bottom plate 4 a. 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 in a state where the subassembly 7 is accommodated in the housing 10, it may be formed at the contact position (or projection position) of the thick portion 8d. 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, the battery module 20 includes an array body 15 in which a plurality of battery cells 11 are held by the cell holder 21 and one side in the array direction (X-axis direction) of the array body 15. The arranged elastic member 31 (see FIG. 5), a pair of

brackets

41, 41 arranged on both sides in the arrangement direction with respect to the array 15 and the elastic member 31, and a plurality of the pair of

brackets

41, 41 connected to each other , And a middle plate 61 (see FIG. 5) disposed between the array 15 and the elastic member 31.

A battery cell 11 shown in FIG. 4A is a battery in which an electrode assembly is accommodated in a rectangular box-shaped case, and is a nonaqueous 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 via a heat transfer plate (not shown). The electrode terminals 13 of the adjacent battery cells 11 are electrically connected to each other by a bus bar 14, whereby the adjacent battery cells 11 are electrically connected in series. The battery cell 11, the cell holder 21, the heat transfer plate, and the bus bar 14 constitute an array 15.

The cell holder 21 is made of resin. As shown in FIG. 4A and FIG. 4B, the cell holder 21 has a frame body portion 22 and a partition portion 23. The frame body portion 22 includes a bottom plate 24 and a pair of

side plates

25 and 25 erected from both ends of the bottom plate 24. Each of both ends of the bottom plate 24 is provided with a protruding portion 24a protruding in the thickness direction of the bottom plate 24, and each of the protruding portions 24a is provided with an insertion hole 24b penetrating in the arrangement direction. Bolts 51 (see FIG. 3) are inserted through the insertion holes 24b.

The partition part 23 connects a pair of

side plates

25 and 25 to each other. A pair of terminal

accommodating portions

26 and 26 are provided on the partition portion 23. Each of the pair of terminal

accommodating portions

26, 26 has a circular inner wall surrounding the electrode terminal 13. Furthermore, a pair of

square pillars

27, 27 are provided on the partition part 23. Each of the pair of

column portions

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. Bolts 51 (see FIG. 3) are inserted through the insertion holes 27a.

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

The elastic member 31 is formed in a flat plate shape by rubber, for example. 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 array direction, and fix 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 sandwiching portion 42 and a fixing portion 43 with the bent portion 41a interposed therebetween. The bracket 41 is formed with a rib 44 for increasing the strength.

The sandwiching portion 42 is a portion that sandwiches the array 15 via the elastic member 31 and the middle plate 61. A plurality of (four in this example) insertion holes 42 a for inserting the bolts 51 are provided in the clamping portion 42. The fixing portion 43 is a portion that is fixed to the base plate 8 of the subassembly 7, and is fixed to the base plate 8 by screws 55, for example. The fixing portion 43 is provided with a plurality of (four in this example) insertion holes 43a through which the screws 55 are inserted.

The bolt 51 is made of, for example, a ferrous metal having a relatively high strength. A plurality of bolts 51 (four in this example) are provided, and extend in the arrangement direction to connect the pair of

brackets

41 and 41 to 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, 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. By this fastening, a restraining load is applied to the array body 15 and the elastic member 31.

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

Next, the screw 9b is inserted into the insertion hole 5b from the outside of the side plate 4d in the box-shaped component 3, and the screw 9b is screwed into the screw hole 8c formed in the other main surface 8b 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 that are erected from the periphery of the bottom plate 4a in the box-shaped component 3. Then, a screw 9a is inserted from the outside of the side plate 6b in the lid part 6 into the insertion hole 6c and the insertion hole 5b of the side plate 4d in the box-shaped part 3, and into the screw hole 8c formed in the other main surface 8b of the base plate 8. The screw 9a is screwed.

The sub-assembly 7 is fixed to the box-shaped part 3 by the process described above. Further, the lid part 6 that covers the opening 3 a of the box-shaped part 3 is fixed to the box-shaped part 3. As a result, the subassembly 7 in which the battery module 20 is fixed in the internal space S1 of the housing 10 composed of the box-shaped component 3 and the lid component 6 joined so as to cover the opening 3a of the box-shaped component 3 is formed. Be contained.

Next, the function and effect of the battery pack 1 of the above embodiment will be described. In the battery pack 1 of the above embodiment, the sub-assembly 7 in which the battery module 20 is fixed to the base plate 8 that is thicker than the bottom plate 4a, the front plate 4b, the rear plate 4c, and the pair of side plates 4d that form the box-shaped component 3. Is housed in the internal space S1 of the housing 10 formed by joining the box-shaped component 3 and the lid component 6. Thereby, the thickness of the bottom plate 4a, the front plate 4b, the rear plate 4c and the pair of side plates 4d forming the box-shaped component 3 is made smaller (thinner) than the thickness of the base plate 8 to which the battery module 20 is fixed. Can do. For this reason, compared with the case where a case is formed by welding and joining members to which the battery module 20 is fixed, it is possible to prevent the welding time at the time of joining from becoming long, and the difference in the quality of the joined portion by welding. Can be made difficult to occur. That is, it becomes easy to maintain the quality of the welded portion constant.

Also, in general, the thinner the member, the higher the adhesion of the coated film after painting because no oxide film is attached to the surface of the steel material. On the other hand, a thick steel plate has a thick oxide film, and the adhesion between the base material and the oxide film is low. For this reason, the adhesiveness of a coating film is securable by using a thin plate, without performing special processes, such as oxide film removal. In the battery pack 1 of the present embodiment, the casing 10 composed of the box-shaped part 3 and the lid part 6 can be formed from a relatively thin material, so that the adhesion of the coating film can be ensured and the quality is improved. Can do.

In the battery pack 1 of the above embodiment, the lid part 6 is also formed of a member having a thickness smaller than that of the base plate 8. Therefore, in the case where the cover plate 6a and the side plate 6b are formed by welding, it is possible to prevent the welding time during joining from becoming long and to make it difficult to produce a difference in quality of the joined portion by welding.

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-shaped part 3. Thereby, the box-shaped component 3 and the base plate 8 in the subassembly 7 are fastened from the outside of the housing 10 by the

screws

9a and 9b. Since the base plate 8 can secure the length for screwing the

screws

9 a and 9 b in the thickness direction, the subassembly 7 can be securely fixed to the box-shaped part 3.

In the battery pack 1 of the above embodiment, the bottom plate 4a of the box-shaped component 3 is formed with a through hole 5a penetrating in the thickness direction of the bottom plate 4a. Thereby, even if water permeates into the housing 10, the water is discharged from the through hole 5a formed in the bottom plate 4a. Moreover, since the through-hole 5a is arrange | positioned under the base board 8, the water which infiltrated from the junction part of the box-shaped component 3 and the cover component 6 arrange | positions the battery module 20 in the housing | casing 10. FIG. Reaching the area can be prevented.

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 that are erected from the periphery of the bottom plate 4a in the box-shaped component 3. The side plate 6b and the base plate 8 are fastened by screws 9a with the side plate 4d interposed therebetween. Thereby, since the infiltration path to the inside of the housing | casing 10 is ensured long, the waterproofness inside the housing | casing 10 can be improved.

Although one embodiment has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the 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-shaped component 3 is given. However, the present invention is not limited to this. For example, as shown in FIG. 7, in the box-shaped component 3, 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, and the lid component 6 The battery pack 101 having a configuration in which the thickness portions 6 d of the four square plate-like side plates 6 b erected from the periphery are joined via the seal member 70 may be used.

In the battery pack 101 according to the modified example 1, the screw 9b is inserted into the insertion hole 5b from the outside of the side plate 4d in the box-shaped component 3, and the screw 9b is inserted into the screw hole 8c formed in the other main surface 8b of the base plate 8. Screw together. Next, the side plate 6 b of the lid part 6 is extrapolated to the base plate 8 of the subassembly 7. Then, a screw 9a is inserted from the outside of the side plate 6b in the lid part 6 into the insertion hole 6c and the insertion hole 5b of the side plate 4d in the box-shaped part 3, and 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 and the pair of side plates 4d that are erected from the periphery of the bottom plate 4a in the box-shaped component 3 and the side plate 6b in the lid component 6 are in the thickness direction. Does not overlap. For this reason, it can avoid that the cover component 6 jumps out in the thickness direction. Moreover, since the sealing member 70 is arrange | positioned at the junction part of the box-shaped component 3 and the lid | cover component 6, it can suppress that water permeates from the said junction part.

<Modification 2>
In the said embodiment and the said modification, although the cover component 6 gave and demonstrated the example which consists of the four side plates 6b standingly arranged from the periphery of the cover plate 6a and the cover plate 6a, this invention is limited to this. Not. For example, as shown in FIG. 8, as a battery pack 201 having a configuration in which a flat lid component 206 made only of the lid plate 6 a in the above embodiment is fixed to a thickness portion 8 d of the base plate 8 in the subassembly 7. Also good.

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

According to the battery pack 201 of the second modification, the lid component 6 jumps out in the thickness direction of 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-shaped component 3. Can be avoided.

<Other variations>
In the said embodiment and the said modification, although the box-shaped component 3 and the cover component 6 (206) gave and demonstrated the example joined by the screw | thread 9a, you may join by fastening components, such as a rivet, You may join by welding etc.

In the said embodiment and the said modification, although the example which fixed the four battery modules 20 to the subassembly 7 was given and demonstrated, for example, even if less than four pieces or five or more battery modules 20 are fixed Good. Further, a dummy module having a mass similar to that of the battery module may be fixed to the subassembly 7 instead of and / or in addition to the battery module 20.

In the said embodiment and the said modification, although the example in which the through-hole 5a for drainage penetrated in the thickness direction of the bottom plate 4a in the box-shaped component 3 was given and demonstrated, this through-hole 5a is not provided. May be.

In the said embodiment and the said modification, although the

subassembly

7 and 7 to which the battery module 20 was fixed was given and demonstrated as an example fixed to the

side plates

4d and 4d in 1st components, it replaced with the

side plates

4d and 4d, It may be fixed to the front plate 4 and the rear plate 4c in the first component.

DESCRIPTION OF SYMBOLS 1,101,201 ... Battery pack, 3 ... Box-shaped part (1st part), 3a ... Opening part, 4a ... Bottom plate (1st member, 1st bottom part), 4b ... Front plate (1st member, 1st cylinder) Part), 4c ... rear plate (first member / first tube portion), 4d ... side plate (first member / first tube portion), 4e ... thick portion, 5a ... through hole, 5b ... insertion hole, 6,206 ... lid parts (second parts), 6a, 206a ... lid plates (first member / second bottom part), 6b ... side plates (first member / second cylinder part), 6c, 206c ... insertion holes, 6d ... thickness part (Second tube portion), 7 ... subassembly (third part), 8 ... base plate (second member), 8a ... one main surface, 8b ... the other main surface, 8d ... thickness portion, 9a, 9b ... Screws (fastening members), 10 ... housing, 11 ... battery cell, 20 ... battery module, 70 ... seal member, S1 ... internal space.

Claims

A battery pack comprising a battery module comprising a plurality of battery cells,
A bottomed cylindrical first component formed by welding a plurality of flat plate-shaped first members;
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 larger than that of the first member;
The third component is a battery pack accommodated 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 or 2, wherein the second component is formed of a member having a thickness smaller than that of the second member.
The first component has a first bottom portion, and a first tube portion standing from the first bottom portion,
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 tube portion.
A through-hole penetrating in the thickness direction of the first bottom portion is formed in the first bottom portion,
The battery pack according to claim 4, wherein the through hole is disposed below a second member in the third component.
The second component has a second bottom portion, and a second cylinder portion standing from the second bottom portion,
The second cylinder part is extrapolated to the first cylinder part,
The battery pack according to claim 4 or 5, wherein the second tube portion and the second member are fastened by a fastening member with the first tube portion interposed therebetween.
The second component has a second bottom portion, and a second cylinder portion standing from the second bottom portion,
The battery pack according to claim 4, wherein the thickness portion of the first tube portion and the thickness portion of the second tube portion are arranged so as to be joined.
The battery pack according to claim 7, wherein the thickness portion of the first cylinder portion and the thickness portion of the second cylinder portion are joined via a seal member.
The battery pack according to any one of claims 1 to 5, wherein the second part is fastened to a thickness portion of the second member in the third part by a fastening member.