CN109980142B

CN109980142B - Battery pack

Info

Publication number: CN109980142B
Application number: CN201811590334.3A
Authority: CN
Inventors: 庄田隆博
Original assignee: Yazaki Corp
Current assignee: Yazaki Corp
Priority date: 2017-12-25
Filing date: 2018-12-25
Publication date: 2022-02-18
Anticipated expiration: 2038-12-25
Also published as: CN109980142A; JP7094697B2; JP2019114429A; DE102018222775A1

Abstract

Provided is a battery pack capable of connecting first and second conductive members after an outer lid is attached to a housing, thereby facilitating airtight handling and assembly processes. The third lower module bus bar (26) is attached to the lower module (2) and is electrically connected to the battery (21). A terminal bus bar (33) is attached to the upper cover (31) and is electrically connected to the terminal (32). Further, the upper cover (31) is provided with a through hole (312A), and the third lower module bus bar (26) and the terminal bus bar (33) are electrically connected to each other by a bolt (4) penetrating the through hole (312A).

Description

Battery pack

Technical Field

The present invention relates to a battery pack.

Background

As one example of the above-described battery pack, for example, batteries described in patent documents 1 and 2 have been proposed. In the batteries described in patent documents 1 and 2, in order to achieve airtightness, bolts (external terminals) for connection to the outside are integrally molded on the cover portion with bus bars for connection to the electrodes of the battery body. For this reason, before the case body accommodates the battery body, the electrodes of the battery body are connected to the bus bars, and then, while the cover is attached to the battery body, the case body accommodates the battery body. Therefore, there is a problem that assembly is not easy.

Alternatively, it is conceivable to attach the external terminals after attaching the cover portion to the housing body. However, in this case, there is a problem that the airtight process between the external terminal and the lid portion becomes difficult.

Reference list

Patent document

Patent document 1: JP 2013-4443A

Patent document 2: JP 2016-

Disclosure of Invention

Technical problem

The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a battery pack that facilitates airtight handling and assembly processes.

Means for solving the problems

According to the present disclosure, there is provided a battery pack including:

a battery;

an accommodating portion that accommodates the battery;

an outer cover that covers the housing portion and to which an external terminal is attached;

a first conductive member that is attached to the housing portion and that is electrically connected to the battery; and

a second conductive member that is attached to the outer cover and that is electrically connected to the external terminal,

wherein the outer cover is provided with a first through hole, and

wherein the first conductive member and the second conductive member are electrically connected to each other by a first bolt penetrating the first through hole.

Preferably, the accommodating portion includes an accommodating portion body that accommodates the battery and an intermediate cover that covers an outer cover side of the accommodating portion body, the intermediate cover is provided with a first screw hole to be screwed with the first bolt, the first conductive member is disposed on the outer cover side on the intermediate cover, and the first bolt is screwed with the first screw hole to connect the first conductive member and the second conductive member while penetrating the first conductive member and the second conductive member.

Preferably, the battery pack further includes a third conductive member attached to the battery, the intermediate cover is provided with a second through hole through which the third conductive member protrudes toward the outer cover, and the first conductive member is directly or indirectly connected to the third conductive member protruding from the intermediate cover toward the outer cover.

Preferably, the first conductive member is an electric member provided with a pair of second screw holes, and the first bolt is screwed with one of the pair of second screw holes of the electric member while penetrating the second conductive member to connect the second conductive member and the electric member.

Preferably, the battery pack further includes a third conductive member attached to the battery, the housing includes a housing body housing the battery and an intermediate cover covering an outer cover side of the housing body, the intermediate cover is provided with a second through hole through which the third conductive member protrudes toward the outer cover, and the second bolt is screwed with the other of the pair of second screw holes to connect the electrical component to the third conductive member while penetrating the third conductive member protruding from the intermediate cover toward the outer cover.

Preferably, the electric component is mounted on the intermediate cover such that the second screw hole is parallel to the intermediate cover, and the outer cover is provided with a protrusion protruding outward, and the first through hole is provided on a side surface of the protrusion.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure described above, after the outer cover is attached to the housing portion, the first and second conductive members are electrically connected to each other to connect the external terminal to the battery. Thus, airtight handling and assembling processes become easy.

Drawings

Fig. 1 is a sectional view of a battery pack according to a first embodiment;

fig. 2 is an exploded sectional view of the battery pack shown in fig. 1;

fig. 3 is a sectional view of a battery pack according to a second embodiment; and is

Fig. 4 is an exploded sectional view of the battery pack shown in fig. 3.

List of reference marks

1 Battery pack

4 bolt (first bolt)

21 cell

22 lower cover (containing part)

23 breaker (first conductive parts, electric component)

221 lower cover body (containing part body)

222 inner cover (middle cover)

222A Via (second Via)

222B insert nut (first screw hole)

231. 232 connecting part (second screw hole)

25 second lower module busbar (third conductive part)

26 third lower module busbar (first conductive part)

27 bolt (second bolt)

31 upper cover (outer cover)

32 terminal (external terminal)

33 terminal bus bar (second conductive component)

313 side wall (side surface)

313A Via (first Via)

315 projection

Detailed Description

(first embodiment)

Hereinafter, a first embodiment of the present disclosure will be described with reference to fig. 1 and 2. As shown in these drawings, the battery pack 1 includes a lower module 2, an upper module 3, bolts 4, O-rings 5, and an insulating cover 6. First, the lower module 2 will be described. The lower module 2 has a battery 21 as a battery, a lower cover 22 as an accommodating portion, a breaker 23 as an electrical component, first to third lower module bus bars 24 to 26, and

bolts

27, 28.

The battery 21 is formed in a box shape. A plurality of batteries 21 are arranged in the horizontal direction in the drawing, and are accommodated in a lower cover 22 described later. A pair of electrodes (anode, cathode) is provided on the respective upper surfaces of these cells 21. When the mutually adjacent cells 21 are connected together by the first lower module bus bar 24, the plurality of cells 21 are connected in series.

The lower cover 22 is made of an insulating member such as synthetic resin, and has a lower cover body 221 that accommodates the plurality of cells 21 and an inner cover 222 as an intermediate cover that covers the lower cover body 221. The lower cover body 221 has a bottom wall 221A and a peripheral wall 221B standing upward in the vertical direction in the drawing from the periphery of the bottom wall 221A, and is formed in a saucer shape opening upward.

The above-described battery 21 is disposed on the bottom wall 221A of the lower cover body 221 such that the electrode faces the opening of the lower cover body 221. The bottom wall 221A is formed in a rectangular shape elongated in the horizontal direction, for example. The peripheral wall 221B is provided upright from the entire periphery of the rectangular bottom wall 221A, and is slightly higher than the height of the battery 21.

The inner lid 222 is provided in a rectangular plate shape elongated in the horizontal direction, similarly to the bottom wall 221A. The inner cover 222 is attached to the inside of the peripheral wall 221B by, for example, engagement or adhesion, so as to cover an opening provided above the lower cover body 221. Further, the inner lid 22 is provided with: a through-hole 222A, which is a second through-hole into which a second lower module bus bar 25 as a third conductive member described later is inserted; and an insert nut 222B as a first screw hole of metal, and a bolt 4 described later is screwed with this insert nut 222B. The through hole 222A penetrates the inner lid 222 in the vertical direction. The insert nut 222B is insert-molded such that its screw hole also penetrates the inner lid 222 in the vertical direction.

The breaker 23 is an electrical component that interrupts overcurrent by fusing when overcurrent flows in the battery 21. The circuit breaker 23 is upwardly disposed on the inner cover 222, and the

connection portions

231 and 232 are respectively provided on mutually opposite surfaces in the horizontal direction. The pair of connecting

portions

231 and 232 are provided with screw holes (second screw holes), respectively, for fastening the second and third lower module bus bars 25, 26 with screws. That is, the pair of screw holes are arranged in the horizontal direction.

A plurality of first lower module bus bars 24 are provided, and the plurality of cells 21 are connected in series by connecting the electrodes of the cells 21 adjacent to each other.

The second lower module bus bar 25 is attached to the electrodes of the cells 21 arranged at the end in the horizontal direction (the left end in this embodiment). The second lower module bus bar 25 has a first conductive portion 25A superposed on the electrode of the battery 21 and a second conductive portion 25B standing upward in the vertical direction from the left end of the first conductive portion 25A, and is formed in a substantially L-shape. The second conductive portion 25B protrudes above the inner cover 222 through a through hole 222A formed in the inner cover 222.

The second conductive portion 25B protruding above the inner cover 222 is superposed on the connecting portion 231 at the left side of the circuit breaker 23. The second conductive portion 25B is provided with a through hole 25B1 for passing the bolt 27 therethrough. In this embodiment, the through hole 25B1 is provided to penetrate in the horizontal direction. The through hole 25B1 is superposed on a screw hole provided on the left side of the connecting portion 231. Then, when the bolt 27 is screwed into the screw hole of the connection portion 231 while being inserted into the through hole 25B1, the second lower module bus bar 25 and the circuit breaker 23 can be electrically connected to each other.

The third lower module bus bar 26 as a first conductive member has a third conductive portion 26A to be superimposed on the upper side of the inner cover 222 and a fourth conductive portion 26B erected vertically upward from the left end of the third conductive portion 26A and superimposed on the connecting portion 232 at the right side of the circuit breaker 23, and is formed in a substantially L-shape. The third conductive portion 26A is provided with a through hole 26A1 penetrating in the vertical direction at a portion overlapping the insert nut 222B for passing the bolt 4. The fourth conductive portion 26B is provided with a through hole 26B1 for passing the bolt 28 therethrough.

In this embodiment, the through hole 26B1 is provided to penetrate in the horizontal direction. The through hole 26B1 is superposed on a screw hole provided on the right side of the connecting portion 232. Then, when the bolt 28 is screwed into the screw hole of the connection portion 232 while being inserted into the through hole 26B1, the third lower module bus bar 26 and the circuit breaker 23 can be electrically connected to each other.

Next, the upper module 3 will be described. The upper module 3 includes an upper cover 31 as an outer cover, terminals 32, terminal bus bars 33 (second conductive members), and bolts 34.

The upper cover 31 is made of an insulating member such as synthetic resin, and is attached to the lower cover body 221 to cover the inner cover 222. The upper cover 31 has:

upper walls

311, 312, the

upper walls

311, 312 being provided in two upper and lower stages; a side wall 313, the side wall 313 connecting the

upper walls

311, 312 to each other; a peripheral wall 314, which is formed in a saucer shape that is opened downward and stands upward from the peripheral edges of the

upper walls

311, 312. The

upper walls

311, 312 are provided in two stages up and down such that the upper wall 311 faces the breaker 23, i.e., the upper wall 311 on the left side is located on the upper side, and the upper wall 312 on the right side is located on the lower side. The terminals 32 are air-tightly disposed on the lower upper wall 312 using a known air-tight process. Further, a known countermeasure for preventing the co-rotation is applied to the terminal 32 so as not to rotate around the shaft. The upper wall 311, the peripheral wall 314 standing upward from the upper wall 311, and the side wall 313 constitute a protrusion 315 protruding outward.

Further, a through hole 312A described later is provided on the upper wall 312 on the lower side to penetrate in the vertical direction for inserting the bolt 4. When the bolt 4 is fastened to the upper cover 31 made of resin, creep occurs in the upper cover 31, and the fastening force changes. Therefore, the annular metal sleeve 312B is fitted into the through hole 312A. The terminal bus bar 33 is superposed on the lower side of the upper wall 312. The terminal bus bar 33 is provided with a through hole 33A at a portion overlapping the terminal 32 for passing the bolt 34.

When the above-described bolt 34 is screwed into the screw hole provided on the terminal 32 while being inserted into the through hole 33A, the terminal bus bar 33 and the terminal 32 can be electrically connected to each other. Further, the through hole 33B is provided at a position on the terminal bus bar 33 overlapping with the through hole 312A provided on the upper cover 31 when the terminal bus bar 33 is connected to the terminal 32 with the bolt 34.

The bolt 4 is screwed to an insert nut 222B provided on the inner lid 222 while penetrating through

holes

312A, 33B, 26a1 provided on the upper lid 31, the terminal bus bar 33, and the third lower module bus bar 26, respectively. The O-ring 5 is disposed between the upper cover 31 and the head of the bolt 4. The insulating cover 6 is attached to the upper cover 31 to cover the head of the bolt 4. The insulating cover 6 has a first plate portion 61 disposed to be on the same plane as the upper wall 311 and a second plate portion 62 extending downward from the right end of the first plate portion 61, and is formed in a substantially L-shape.

Next, an assembly process of the battery pack 1 having the above configuration will be described. First, the lower module 2 and the upper module 3 are assembled, respectively. First, the assembly of the lower module 2 will be described in detail. The plurality of cells 21 connected in series with the first lower module bus bar 24 are accommodated in the lower cover body 221. Next, the first conductive portion 25A of the second lower module bus bar 25 is superposed on the electrode of the battery 21 at the left end.

Then, the inner lid 222 is attached to the inside of the peripheral wall 221B, thereby closing the opening of the lower lid body 221. At this time, the second conductive portion 25B penetrates the through hole 222A of the inner cover 222 so that the second conductive portion 25B protrudes above the inner cover 222. Then, the breaker 23 is disposed on the upper side of the inner cover 222, and the second conductive portion 25B is connected to the connection portion 231 of the breaker 23 with the bolt 27. Further, the third lower module bus bar 26 is connected to the connection portion 232 of the circuit breaker 23 by the bolt 28. As a result, the assembly of the lower module 2 is completed.

Next, the assembly of the upper module 3 will be described in detail. First, the terminal 32 is attached to the upper cover 31. Incidentally, the terminal 32 may be formed integrally with the upper cover 31 by, for example, insert molding. Then, the terminal bus bar 33 is attached to the terminal 32 with the bolt 34. Thus, the assembly of the upper module 3 is completed.

Next, the upper module 3 is assembled to the lower module 2. At this time, the upper cover 31 is attached to the outside of the peripheral wall 221B of the lower cover body 221 so as to cover the inner cover 222. After the lower module 2 and the upper module 3 are assembled with each other, the through-hole 312A of the upper cover 3, the through-hole 33B of the terminal bus bar 33, the through-hole 26a1 of the third lower module bus bar 26, and the insert nut 222B of the inner cover 222 are overlapped.

Next, the bolt 4 is inserted into the through hole 312A of the upper cover 31, the through hole 33B of the terminal bus bar 33, and the through hole 26a1 of the third lower module bus bar 26, and the bolt 4 is screwed with the insertion nut 222B of the inner cover 222. At this time, the O-ring 5 is arranged to be sandwiched between the upper cover 31 and the head of the bolt 4. Thus, the terminal bus bar 33 and the third lower module bus bar 26 are electrically connected to each other, and the terminals 32 are electrically connected to the batteries 21. Then, the insulating cover 6 is attached to the upper cover 31 to cover the head of the bolt 4, and the assembly process is completed.

According to the first embodiment described above, the third lower module bus bar 26 is attached to the lower module 2 and is electrically connected to the battery 21. Further, the terminal bus bar 33 is attached to the upper cover 31 and electrically connected to the terminal 32. Further, the upper cover 31 is provided with a through hole 312A, and the third lower module bus bar 26 and the terminal bus bar 33 are electrically connected to each other with the bolt 4 penetrating the through hole 312A. Thus, after the battery 21 is accommodated in the lower module 2, the upper cover 31 can be attached, and the assembly process is facilitated. Further, the upper cover 31 can be attached to the lower module 2 at the same time as the terminals 32 are attached to the upper cover 31. Therefore, it is not necessary to attach the terminals 32 after the upper cover 31 is attached to the lower module 2, and the airtight process is facilitated.

Further, according to the first embodiment described above, expensive components are not required. Further, assembly can be performed using ordinary tools and ordinary processes without welding or the like.

Further, according to the first embodiment described above, the inner lid 222 is provided with the insert nut 222B, and the bolt 4 is screwed with the insert nut 222B. Further, the third lower module bus bar 26 is arranged on the upper cover 31 side on the inner cover 222. Further, while the bolt 4 penetrates the third lower module bus bar 26 and the terminal bus bar 33, the bolt 4 is screwed with the insert nut 222B to connect the third lower module bus bar 26 and the terminal bus bar 33. According to the above configuration, the third lower module bus bar 26 and the terminal bus bar 33 can be easily connected to each other by the bolt 4.

Further, according to the above-described first embodiment, the inner lid 222 is provided with the through hole 222A. Further, the second lower module bus bar 25 protrudes toward the upper cover 31 through the through hole 222A. Further, the terminal bus bar 33 is indirectly connected to the second lower module bus bar 25 protruding toward the upper cover 31 via the breaker 23. Thus, the second lower module bus bar 25 can be easily connected to the third lower module bus bar 26 disposed on the inner cover 222.

Incidentally, according to the first embodiment described above, the second lower module bus bar 25 and the third lower module bus bar 26 are indirectly connected to each other via the breaker 23. However, the present disclosure is not limited thereto. The circuit breaker 23 is not indispensable, and the third lower module bus bar 26 and the second lower module bus bar 25 may be directly connected to each other.

(second embodiment)

Next, a second embodiment will be described with reference to fig. 3 and 4. Incidentally, in fig. 3 and 4, components similar to those in the first embodiment described above with reference to fig. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the first embodiment, the arrangement direction of the batteries 21 is the horizontal direction shown in fig. 1 and 2. In the second embodiment, the direction orthogonal to the arrangement direction and the vertical direction of the batteries 21 is the horizontal direction.

The large difference between the first and second embodiments is the connection of the terminal bus bar 33. In the first embodiment, the third lower module bus bar 26 is a first conductive member, and the third lower module bus bar 26 and the terminal bus bar 33 are connected to each other by the bolt 4. In contrast, in the second embodiment, the circuit breaker 23 is the first conductive member, and the circuit breaker 23 and the terminal bus bar 33 are connected to each other by the bolt 4.

The battery pack 1 includes a lower module 2, an upper module 3, a bolt 4, an O-ring 5, and an insulating cover 6. First, the lower module 2 will be described. The lower module 2 has a battery 21, a lower cover 22, a circuit breaker 23, a first lower module bus bar 24 (not shown in fig. 3 and 4), a second lower module bus bar 25, and a bolt 27. That is, in the first embodiment, the third lower module bus bar 26 is provided, and in the second embodiment, the third lower module bus bar 26 is not provided.

Since the battery 21 is similar to that in the first embodiment, it is denoted by the same reference numeral, and detailed description thereof is omitted. The lower cap 22 includes a lower cap body 221 and an inner cap 222. Since the lower cover body 221 is similar to that of the first embodiment, it is denoted by the same reference numeral, and detailed description thereof is omitted. In the inner lid 222, a through hole 222A is provided similarly to the first embodiment, but an insert nut 222B is not provided. Further, the circuit breaker 23 is mounted to a riser 29, and the riser 29 is disposed on an upper side of the inner lid 222.

The upper module 3 includes an upper cover 31, terminals 32, terminal bus bars 33, and bolts 34. Similarly to the first embodiment, the upper cover 31 includes

upper walls

311, 312; a side wall 313; and a peripheral wall 314. Further, in the first embodiment, a through hole 312A for passing the bolt 4 and a metal sleeve 312B are provided on the upper wall 312. In the second embodiment, a through hole 313A for passing the bolt 4 and a metal sleeve 313B are provided on the side wall 313. Thus, the through hole 313A penetrates in the horizontal direction.

In the second embodiment, the terminal bus bar 33 has a sixth conductive portion 33C superimposed on the lower side of the upper wall 312 and a seventh conductive portion 33D protruding upward from the left end of the sixth conductive portion and superimposed on the side wall 313, and is formed in an L shape. The sixth conductive portion 33C is provided with a through hole 33A for passing the bolt 34 at a portion superposed on the terminal 32. The seventh conductive portion 33D is provided with a through hole 33B for passing the bolt 4 at a portion overlapping the through hole 313A of the upper cover 31. The height of the elevating platform 29 is adjusted so that the through

holes

313A, 33B of the above-described upper cover 31 and seventh conductive portion 33D are superposed on the connecting portion 232 at the right side of the circuit breaker 23 while the lower module 2 is assembled with the upper module 3.

Next, an assembly process of the battery pack 1 having the above configuration will be described. Similarly to the first embodiment, the lower module 2 and the upper module 3 are assembled separately. The assembly of the lower module 2 will be described in detail. The plurality of cells 21 connected in series with the first lower module bus bar 24 are accommodated in the lower cover body 221. Next, the first conductive portion 25A of the second lower module bus bar 25 is superposed on the electrode of the battery 21 at the left end.

Then, the inner lid 222 is attached to close the opening of the lower lid body 221. At this time, the second conductive portion 25B penetrates the through hole 222A of the inner cover 222 so that the second conductive portion 25B protrudes above the inner cover 222. Then, the elevating platform 29 is disposed on the upper side of the inner cover 222, and the circuit breaker 29 is disposed thereon again. Then, the second conductive portion 25B is connected to the connection portion 231 of the breaker 23 by the bolt 27. As a result, the assembly of the lower module 2 is completed.

Next, the assembly of the upper module 3 will be described in detail. Similarly to the first embodiment, the terminal bus bar 33 is attached to the terminal 32 attached to the upper cover 31 with the bolt 34. Thus, the assembly of the upper module 3 is completed.

Next, the upper module 3 is assembled to the lower module 2. At this time, the upper cover 31 is attached to the outside of the peripheral wall 221B of the lower cover body 221 so as to cover the inner cover 222. After the lower module 2 and the upper module 3 are assembled with each other, the through hole 313A of the upper cover 3, the through hole 33B of the terminal bus bar 33, and the connection portion 232 of the circuit breaker 23 are overlapped.

Subsequently, the bolt 4 is inserted into the through hole 313A of the upper cover 31 and the through hole 33B of the terminal bus bar 33, and the bolt 4 is screwed into the connection portion 232 of the breaker 23. At this time, the O-ring 5 is arranged to be sandwiched between the upper cover 31 and the head of the bolt 4. Thus, the terminal bus bar 33 and the breaker 23 are electrically connected to each other, and the terminal 32 is electrically connected to the battery 21. Then, the insulating cover 6 is attached to the upper cover 31 to cover the head of the bolt 4, and the assembly process is completed.

According to the second embodiment described above, while the bolt 4 penetrates the terminal bus bar 33, the bolt 4 is screwed with the connection portion 232 (one of the pair of connection portions 231, 232) of the circuit breaker 23 to connect the circuit breaker 23 and the terminal bus bar 33 to each other. Thus, attachment of the bolts 28 is not required, and assembly is facilitated more than in the first embodiment.

Further, according to the above-described second embodiment, the lower module 2 has the lower cover body 221 that houses the battery 21 and the inner cover 222 that covers the upper cover 31 side of the lower cover body 221. The inner lid 222 is provided with a through hole 222A. The second lower module bus bar 25 protrudes toward the upper cover 31 via the through hole 222A. When the bolt 27 is screwed with the connection portion 231 (one of the pair of connection portions 231, 232) of the circuit breaker 23 while the bolt 27 penetrates the second lower module bus bar 25 protruding toward the upper cover 31, the circuit breaker 23 is connected to the second module bus bar 25. Thus, the second module bus bar 25 can be easily connected to the circuit breaker 23 disposed above the inner cover 222.

Further, according to the above-described second embodiment, the

connection portions

231, 232 are mounted above the inner lid 222 so as to be parallel to the inner lid 222. The upper cover 31 is provided with a protruding portion that protrudes above the upper wall 312. The through hole 313A is provided on a side wall 313 (side surface) of the protruding portion. Thereby, the terminal bus bar 33 can be easily connected to the breaker 23 disposed above the inner cover 222.

Incidentally, in the above-described embodiment, the breaker 23 is used as an electrical component. However, the present disclosure is not limited thereto. The electrical component may be a temperature sensor, or may be a voltage detector.

Incidentally, the present disclosure is not limited to the above-described embodiments. That is, the present disclosure can be modified and implemented in various ways without departing from the scope of the present disclosure.

Claims

1. A battery pack, comprising:

a battery;

an accommodating portion that accommodates the battery;

a first conductive member that is attached to the housing portion and that is electrically connected to the battery;

a second conductive member that is attached below an upper wall of the outer cover and that is electrically connected to the external terminal; and

a third conductive member attached to the battery,

wherein the outer cover is provided with a first through hole,

wherein the first conductive member and the second conductive member are electrically connected to each other by a first bolt penetrating the first through hole,

wherein the accommodating part includes: a housing part body housing the battery, and an intermediate cover covering an outer cover side of the housing part body,

wherein the intermediate cover is provided with a first screw hole to be screwed with the first bolt,

wherein the first conductive member is disposed on an outer cover side on the intermediate cover,

wherein the first bolt is screwed with the first screw hole to connect the first conductive member and the second conductive member while penetrating the first conductive member and the second conductive member,

wherein the middle cover is provided with a second through hole,

wherein the third conductive member protrudes toward the outer cover through the second through hole, and

wherein the first conductive member is directly or indirectly connected to the third conductive member protruding from the intermediate cover toward the outer cover.

2. A battery pack, comprising:

a battery;

an accommodating portion that accommodates the battery;

a first conductive member that is attached to the housing portion and is electrically connected to the battery, and that is an electrical member provided with a pair of second screw holes;

a third conductive member attached to the battery,

wherein the outer cover is provided with a first through hole,

wherein a first bolt penetrating the first through hole is screwed with one of a pair of second screw holes of the electric component while penetrating the second conductive member to electrically connect the first conductive member and the second conductive member,

wherein the middle cover is provided with a second through hole,

wherein a second bolt is screwed with the other of the pair of second screw holes to connect the electric component to the third conductive member while penetrating the third conductive member protruding from the intermediate cover toward the outer cover.

3. The battery pack according to claim 2, wherein the battery pack,

wherein the electric component is mounted on the intermediate cover such that the second screw hole is parallel to the intermediate cover, an

Wherein the outer cover is provided with a protrusion protruding outward, and the first through hole is provided on a side surface of the protrusion.