JP7434966B2 - battery pack - Google Patents

Description

The present invention relates to a battery pack.

Vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) are equipped with a plurality of secondary batteries such as lithium ion batteries that store power to be supplied to electric motors. For example, according to Patent Document 1, a battery module is formed by housing a plurality of secondary batteries in a battery case. The battery case has an abutting wall portion against which one side of all the stored secondary batteries abuts. Further, a plurality of battery modules are housed in a housing to form a heating element housing device as a battery pack. The housing is provided with a plurality of shelf boards. By providing a plurality of shelf boards, the interior of the casing is partitioned into a plurality of stages. The housing is provided with an air supply port that communicates with each of the spaces partitioned into multiple stages. The housing is provided with an exhaust port on a wall portion opposite to the wall portion where the air supply port is provided. Openings are formed in the plurality of shelf boards so that air introduced from the air supply port flows toward the exhaust port. A battery module is placed on each of the plurality of shelf boards. A contact wall portion of the battery case is placed on the plurality of shelf boards. The plurality of shelf boards and the wall portion of the battery case on the opposite side of the contact wall portion are spaced apart from each other, and function as a flow path through which air introduced from the air supply port flows.

Patent No. 6261975

By the way, when cooling a battery module, the most efficient cooling method is to cool the contact wall of the battery case. However, in the heating element housing device described above, the abutting wall portion of the battery case is placed on the shelf board, resulting in a decrease in cooling efficiency.

The present invention has been made by focusing on the problems existing in the conventional technology, and an object thereof is to provide a battery pack that can improve the cooling efficiency of battery modules.

A battery pack that solves the above problem includes a battery case, a plurality of battery modules having a plurality of secondary batteries housed inside the battery case, and a housing housing the plurality of battery modules. In the pack, the battery case has a contact wall portion against which one side of all the secondary batteries housed in the battery case is in contact, and the casing includes a first wall portion and a second wall disposed at a position opposite to the first wall, the casing has a second wall that communicates between the inside and outside of the casing and is formed by at least a portion of the first wall. an inlet port that communicates with the inside and outside of the housing and is formed by at least a portion of the second wall portion, and the first wall portion and the second wall portion face each other. The direction in which the contact walls are arranged is a first direction, and the direction perpendicular to the first direction is a second direction. A communication tube is disposed between the first wall section and the second wall section so as to face each other with a gap in between, and is provided inside the casing to communicate the inlet port and the outlet port in the first direction. A passage is formed, and a ventilation passage through which air flows, formed by the contact walls facing each other in the second direction, forms at least a part of the communication passage.

According to this, the air introduced from the suction port flows through the communication path and flows toward the discharge port. At this time, the contact walls of all the battery cases are directly cooled by air flowing through the ventilation channel that forms at least a portion of the communication channel. Therefore, the abutting wall portion of the battery case of the battery module can be directly air-cooled, so that the cooling efficiency of the battery module can be improved.

In the above battery pack, the casing is a plate-shaped member disposed between the first wall portion and the second wall portion, and is disposed such that the thickness direction thereof is in the first direction. and a shelf board on which a plurality of battery modules are disposed on a surface facing the first wall part, and inside the housing, both sides of the shelf board are communicated with each other, and at least one of the shelf boards is connected to the shelf board. A communication port forming a part of the communication path may be formed, and the communication path may be formed by communicating the ventilation flow path and the communication port in the first direction. .

According to this, since the housing has the shelf board, the battery module can be easily accommodated in the housing. Therefore, it becomes easier to accommodate the battery module in the housing while improving the cooling performance of the battery module.

In the above battery pack, the suction port, the discharge port, the communication port, and the ventilation flow path are such that a virtual straight line extending in the first direction connects the suction port, the discharge port, the communication port, and the ventilation flow path. It is preferable that the passage be provided so as to pass through the entire interior of each passage.

According to this, the air introduced into the suction port can easily blow through from the discharge port via the communication path. Therefore, fresh air can be easily blown into the housing, so that the cooling efficiency of the battery module can be further improved.

In the battery pack described above, the casing includes a plurality of column members extending in the first direction so that their axes are parallel and are the same member, and a plurality of plate members having a square plate shape. , where a direction perpendicular to the first direction and the second direction is a third direction, the plurality of pillar members are arranged at intervals in the second direction, and are composed of at least three pillar members. a first column group consisting of a plurality of column members constituting the first column group; and a second column group constituted by the column members disposed at positions facing each of the plurality of column members constituting the first column group in the third direction. , the plurality of plate members are provided on one side in the axial direction of the column member and are provided in plurality in the second direction, and the first plate member forming the first wall portion and the plurality of plate members are provided on one side in the axial direction of the column member. a second plate member provided on the other side of the plate member and provided in plurality in the second direction and forming the second wall portion; and a second plate member provided between the first plate member and the second plate member and provided in plurality in the second direction; a plurality of third plate members provided in two directions and forming the shelf board, between two first plate members adjacent in the second direction and two first plate members; The suction port is formed by the two pillar members arranged, the two second plate members adjacent in the second direction, and the two pillar members arranged between the two second plate members. The discharge port is formed by the pillar member, the two third plate members adjacent in the second direction, and the two pillar members disposed between the two third plate members. It is preferable that the communication port is formed.

According to this, the suction port, the discharge port, and the communication port can be easily formed by assembling the column member and the plate member having simple shapes. Further, when the housing is viewed from the first direction, the inlet, the outlet, and the communication port have the same shape and are provided at the same position. Therefore, the air introduced into the inlet becomes easier to blow through through the outlet. Therefore, the cooling efficiency of the battery module can be further improved with a simple configuration.

According to this invention, the cooling efficiency of the battery module can be improved.

A perspective view of a battery pack. FIG. 3 is an exploded perspective view of the battery module. A perspective view of a secondary battery. A sectional view taken along line 4-4 in FIG. 2. A sectional view taken along line 5-5 in FIG. 2. FIG. 3 is a perspective view showing the housing body. A cross-sectional view of a battery pack. The perspective view which shows the housing main body in a modification. A sectional view of a battery pack in a modified example.

An embodiment of a battery pack will be described below with reference to FIGS. 1 to 7.
As shown in FIG. 1, the battery pack 1 includes a plurality of battery modules 10 and a housing 20 that accommodates the plurality of battery modules 10. The housing 20 has a rectangular parallelepiped shape. The casing 20 includes a casing main body 21 and four side walls 22 having a square plate shape.

As shown in FIG. 2, the battery module 10 has a rectangular parallelepiped shape. The battery module 10 includes a battery case 30 and a plurality of secondary batteries 40 housed inside the battery case 30. The battery case 30 includes a battery case main body 31 and a rectangular plate-shaped battery case lid 32 that closes an opening 31c of the battery case main body 31. The battery case main body 31 has a bottom wall 31a in the shape of a rectangular plate, and a side wall 31b in the shape of a square tube that stands upright from the outer edge of the bottom wall 31a.

As shown in FIG. 3, the secondary battery 40 includes an electrode body 41 and a case 42 that accommodates the electrode body 41. The case 42 has a rectangular parallelepiped shape. The case 42 includes a case body 43 and a rectangular plate-shaped lid 44 that closes an opening (not shown) of the case body 43. The case body 43 has a bottom wall 43a in the shape of a rectangular plate, and a side wall 43b in the shape of a square tube that stands upright from the outer edge of the bottom wall 43a. In addition to the electrode body 41, the case 42 accommodates an electrolytic solution (not shown). The lid body 44 has a pressure release valve 45 that opens to release the internal pressure of the case 42 when the internal pressure of the case 42 exceeds a predetermined value.

As shown in FIG. 2, the plurality of secondary batteries 40 are housed in the battery case main body 31 such that the pressure release valves 45 of the lid 44 all face the battery case lid 32. The plurality of secondary batteries 40 are housed in the battery case body 31 such that the longitudinal direction of the battery case body 31 and the longitudinal direction of the lid body 44 coincide. Sixteen secondary batteries 40 are housed in the battery case body 31. Note that the number of secondary batteries 40 housed in the battery case body 31 may be changed as appropriate.

As shown in FIGS. 4 and 5, the outer surface 43c of the bottom wall 43a of the case body 43 of the plurality of secondary batteries 40 is in contact with the bottom wall 31a of the battery case body 31. Therefore, the battery case 30 has the bottom wall 31a as a contact wall portion against which the outer surface 43c of the bottom wall 43a, which is one side of all the secondary batteries 40 housed in the battery case 30, is in contact. Note that the outer surface 43c of the bottom wall 43a of the case body 43 of the plurality of secondary batteries 40 and the bottom wall 31a of the battery case body 31 may be fixed with a bonding member such as an adhesive.

As shown in FIG. 6, the housing main body 21 includes a plurality of square columnar pillar members 23 and a plurality of rectangular plate-shaped plate members 24. The plurality of pillar members 23 are the same member. The plurality of column members 23 extend in the same direction so that the respective axes of the plurality of column members 23 are parallel to each other. The plurality of pillar members 23 have a first pillar group 231 composed of four pillar members 23 arranged in the same row at intervals. The direction in which the plurality of pillar members 23 extend is defined as a first direction A, the direction that is orthogonal to the first direction A and in which the four pillar members 23 constituting the first pillar group 231 are lined up is defined as a second direction B, and the first direction A A third direction C is a direction perpendicular to the second direction B. The four pillar members 23 constituting the first pillar group 231 are arranged at intervals in the second direction B. The distance between the two pillar members 23 located at the center in the second direction B in the first pillar group 231 is the same as that between the pillar members 23 located at both ends in the second direction B in the first pillar group 231 and the pillar members 23 located at the center in the second direction B. and the adjacent column members 23.

The plurality of pillar members 23 includes a second pillar group 232 composed of four pillar members 23 arranged at positions facing each of the four pillar members 23 forming the first pillar group 231 in the third direction C. are doing. The plurality of pillar members 23 are divided into a first pillar group 231 and a second pillar group 232. The four pillar members 23 constituting the second pillar group 232 are arranged in positions symmetrical to the four pillar members 23 constituting the first pillar group 231 in the third direction C. In the third direction C, the distance between the first column group 231 and the second column group 232 is greater than the distance between the two column members 23 located at the center of the first column group 231 in the second direction B. wide. In the third direction C, the distance between the first column group 231 and the second column group 232 is greater than the distance between the two column members 23 located at the center in the second direction B in the second column group 232. wide.

Twelve plate members 24 are provided in this embodiment. The plurality of plate members 24 include three first plate members 24a provided on one side of the plurality of column members 23 in the first direction A, and three plates provided on the other side of the plurality of column members 23 in the first direction A. The third plate member 24c includes a second plate member 24b and six third plate members 24c provided between the first plate member 24a and the second plate member 24b. The three first plate members 24a are arranged at the same position in the first direction A and lined up in the second direction B. The three second plate members 24b are arranged at the same position in the first direction A and lined up in the second direction B. The six third plate members 24c are provided with positions shifted three by three in the first direction A. Of the six third plate members 24c, the three third plate members 24c whose positions are shifted in the first direction A are arranged at the same position in the first direction A and lined up in the second direction B. . The plurality of plate members 24 are arranged so that the positions of the plate members 24 are shifted three by three in the first direction A so that the interior of the housing body 21 has a three-tier configuration. Both ends of each of the plurality of plate members 24 in the third direction C are sandwiched between adjacent column members 23 in the second direction B. Each of the plurality of plate members 24 is fixed to the column member 23 sandwiching both ends in the third direction C by fixing means such as welding. Both end surfaces of all the plate members 24 in the third direction C and the outer surfaces of all the column members 23 in the third direction C are flush with each other.

The three first plate members 24a are an example of a first wall portion. The three second plate members 24b are an example of a second wall portion. The six third plate members 24c provided between the first plate member 24a and the second plate member 24b are an example of shelf boards. The three second plate members 24b serving as the second wall are arranged at positions facing the three first plate members 24a serving as the first wall. Therefore, the first direction A is a direction in which the first plate member 24a and the second plate member 24b face each other.

In the case main body 21 configured as described above, the six third plate members 24c forming the shelf board, the three first plate members 24a forming the first wall part, and the third plate members 24c forming the second wall part. It is a plate-shaped member arranged between the three second plate members 24b to be formed, and is arranged so that the thickness direction is in the first direction A. Furthermore, among the plurality of pairs of column members 23 facing each other in the third direction C, between the two pairs of column members 23 adjacent in the second direction B, the three first plate members 24a and the three The second plate member 24b is arranged near both ends of the column member 23 in the axial direction so as to form a first wall portion and a second wall portion. Among the plurality of pairs of column members 23 facing each other in the third direction C, between the two pairs of column members 23 adjacent in the second direction B, the six third plate members 24c are the first plate members A shelf board is formed between the second plate member 24a and the second plate member 24b. Note that all the parts sandwiched between the two pillar members 23 located at the center in the second direction B in the first pillar group 231 and the two pillar members 23 located in the center in the second direction B in the second pillar group 232 The plate member 24 has the largest area among the plate members 24.

An inlet 25 that communicates between the inside and outside of the housing 20 is formed by two first plate members 24a adjacent in the second direction B and two pillar members 23 arranged between the two first plate members 24a. It is formed. The housing body 21 is provided with two suction ports 25. The two suction ports 25 are spaced apart by the same distance as the distance between the two pillar members 23 located at the center in the second direction B in each of the first pillar group 231 and the second pillar group 232. Note that the suction port 25 is formed by at least a portion of the three first plate members 24a forming the first wall portion.

A discharge port 26 that communicates between the inside and outside of the housing 20 is formed by two second plate members 24b adjacent to each other in the second direction B and two pillar members 23 arranged between the two second plate members 24b. It is formed. The housing body 21 is provided with two discharge ports 26. The two discharge ports 26 are spaced apart by the same distance as the distance between the two pillar members 23 located at the center in the second direction B in each of the first pillar group 231 and the second pillar group 232. Note that the discharge port 26 is formed by at least a portion of the three second plate members 24b forming the second wall portion.

A communication port 27 that communicates both sides of the shelf board is formed by two third plate members 24c adjacent in the second direction B and two pillar members 23 arranged between the two third plate members 24c. has been done. The housing body 21 is provided with four communication ports 27. The four communication ports 27 are spaced apart by the same distance as the distance between the two pillar members 23 located at the center in the second direction B in each of the first pillar group 231 and the second pillar group 232. Note that the communication port 27 is formed by at least a portion of the six third plate members 24c forming the shelf board.

The suction port 25, the discharge port 26, and the communication port 27 are arranged at positions overlapping each other in the first direction A. The suction port 25, the discharge port 26, and the communication port 27 have the same shape.

As shown in FIG. 1, four battery modules 10 are housed in each stage of the housing body 21. As shown in FIG. The plurality of battery modules 10 are housed in the housing body 21 so that the longitudinal direction thereof is in the third direction C. Four battery modules 10 are arranged on the surfaces of the three second plate members 24b that face the three first plate members 24a. Eight battery modules 10 are arranged on the surface of the six third plate members 24c that faces the three first plate members 24a.

Two battery modules 10 are arranged on each of the two third plate members 24c located at the center in the second direction B among the six third plate members 24c. Among the six third plate members 24c, one battery module 10 is arranged in each of the third plate members 24c located at the center in the second direction B and the third plate members 24c adjacent in the second direction B. There is. Two battery modules 10 are arranged on the second plate member 24b located at the center in the second direction B among the three second plate members 24b. Of the three second plate members 24b, one battery module 10 is arranged in each of the second plate members 24b located at the center in the second direction B and the second plate members 24b adjacent in the second direction B. There is.

The side portions of the housing body 21 located in the second direction B and the third direction C are open. The four side walls 22 close off the sides of the housing body 21 located in the second direction B and the third direction C. Thereby, the battery pack 1 is formed. Note that the housing 20 is provided with a fan (not shown), and the fan is arranged to cover the intake port 25 in the housing 20.

As shown in FIG. 7, in the battery modules 10, two of which are arranged in each of the two third plate members 24c located at the center in the second direction B among the six third plate members 24c, two batteries The modules 10 are arranged so that their battery case lids 32 face each other in the second direction B with an interval between them. In the two battery modules 10, the bottom wall 31a of the battery case body 31 is arranged so as not to overlap the communication port 27 in the first direction A and to be adjacent to the communication port 27 in the second direction B. .

In the battery module 10 arranged in the third plate member 24c adjacent in the second direction B to each of the two third plate members 24c located in the center in the second direction B among the six third plate members 24c, The battery module 10 is arranged such that the battery case lid 32 faces the side wall 22 in the second direction B. In the battery module 10, the bottom wall 31a of the battery case body 31 is arranged so as not to overlap the communication port 27 in the first direction A and to be adjacent to the communication port 27 in the second direction B.

In the two battery modules 10 disposed on the second plate member 24b located at the center in the second direction B among the three second plate members 24b, the two battery modules 10 have their respective battery case lids 32 They are arranged to face each other at intervals in the second direction B. In the two battery modules 10, the bottom wall 31a of the battery case body 31 is arranged so as not to overlap the discharge port 26 in the first direction A and to be adjacent to the discharge port 26 in the second direction B. .

Among the three second plate members 24b, the battery module 10 is arranged in the second plate member 24b located at the center in the second direction B and the second plate member 24b adjacent in the second direction B. , the battery case lid 32 is arranged to face the side wall 22 in the second direction B.

In the battery module 10 arranged on the second plate member 24b located at the center in the second direction B among the three second plate members 24b and the second plate member 24b adjacent in the second direction B, the battery case main body 31 The bottom wall 31a is arranged so as not to overlap the discharge port 26 in the first direction A and to be adjacent to the discharge port 26 in the second direction B.

The plurality of battery modules 10 are housed in the housing 20 such that all the bottom walls 31a of the plurality of battery cases 30 face each other at intervals in the second direction B. That is, the plurality of battery modules 10 are arranged such that the three first plate members 24a and the three second plate members are arranged so that all the bottom walls 31a of the plurality of battery cases 30 face each other at intervals in the second direction B. 24b. The bottom walls 31a facing each other in the second direction B form a ventilation channel S, which is a channel through which air flows. The ventilation channel S communicates with the communication port 27 in the first direction A. The suction port 25, the discharge port 26, the communication port 27, and the ventilation channel S are such that a virtual straight line L extending in the first direction A extends inside each of the suction port 25, the discharge port 26, the communication port 27, and the ventilation channel S. It is set up so that everything can pass through. That is, in the battery pack 1, a communication passage 28 is formed by the ventilation passage S and the communication port 27, which communicates the intake port 25 and the discharge port 26. is a part of it.

The operation of this embodiment will be explained.
When the fan provided in the casing 20 is driven, air is taken into the casing 20 through the suction port 25 . Air taken in through the suction port 25 passes through the communication path 28 and is sent out to the discharge port 26. When the air flows through the communication path 28, the bottom wall 31a of the battery case body 31 of the battery module 10 is cooled, and as a result, all the secondary batteries 40 in contact with the bottom wall 31a of the battery case body 31 are cooled. Ru.

The effects of this embodiment will be explained.
(1) Air introduced from the suction port 25 flows through the communication path 28 and flows toward the discharge port 26. At this time, the bottom walls 31a of all the battery cases 30 are directly cooled by air flowing through the ventilation flow path S forming at least a portion of the communication path 28. Therefore, since the bottom wall 31a of the battery case 30 of the battery module 10 can be directly air-cooled, the cooling efficiency of the battery module 10 can be improved.

(2) Since the housing 20 has the six third plate members 24c forming shelf boards, the battery module 10 can be easily accommodated in the housing 20. Therefore, while improving the cooling performance of the battery module 10, it becomes easier to accommodate the battery module 10 in the housing.

(3) The suction port 25, the discharge port 26, the communication port 27, and the ventilation flow path S are arranged so that the virtual straight line L extending in the first direction A connects the intake port 25, the discharge port 26, the communication port 27, and the ventilation flow path It is designed to pass through the entire interior of the Therefore, the air introduced into the suction port 25 easily blows out from the discharge port 26 via the communication path 28. Therefore, fresh air can be easily blown into the interior of the casing 20, so that the cooling efficiency of the battery module can be further improved.

(4) By assembling the column member 23 and plate member 24 having simple shapes, the suction port 25, the discharge port 26, and the communication port 27 can be easily formed. Moreover, when the housing 20 is viewed from the first direction A, the inlet port 25, the outlet port 26, and the communication port 27 have the same shape and are provided at the same position. Therefore, the air introduced into the suction port 25 can easily blow through through the discharge port 26. Therefore, the cooling efficiency of the battery module 10 can be further improved with a simple configuration.

(5) As shown in FIG. 2, when the number of secondary batteries 40 housed in the battery case 30 is large, some of the secondary batteries 40 do not come into contact with the side wall 31b of the battery case 30. In this embodiment, since the bottom wall 31a of the battery case main body 31 that all of the plurality of secondary batteries 40 housed in the battery case 30 come into contact with can be directly air-cooled, the secondary batteries inside the battery case 30 No unevenness occurs in the cooling of 40. Therefore, in order to cool the secondary batteries 40 that are not in contact with the side wall 31b of the battery case 30 to below a certain temperature, the secondary battery 40 that surrounds the secondary battery 40 that is not in contact with the side wall 31b of the battery case 30 is required. There is no need for further cooling. Therefore, power consumption of the fan can be suppressed.

(6) As in the battery pack described in Patent Document 1, when the number of cooling paths for cooling the battery module increases, air cannot be sufficiently taken into the housing unless the output of the fan is increased.

In this respect, in this embodiment, the cooling efficiency of the battery module 10 can be improved with one cooling path formed by the inlet 25, the outlet 26, the communication port 27, and the ventilation channel S. Furthermore, since there are fewer cooling paths, the battery pack 1 can be made smaller.

Note that this embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
○ The configuration of the casing 20 may be changed as follows.

As shown in FIG. 8, the casing 20 includes a casing main body 51 and a casing lid 52 that closes an opening 51c of the casing main body 51. The housing body 51 has a bottom wall 51a in the shape of a rectangular plate, and a side wall 51b in the shape of a square tube that stands upright from the outer edge of the bottom wall 51a. Among a pair of wall portions of the side wall 51b extending in the longitudinal direction of the bottom wall 51a, one is a first wall portion 53 and the other is a second wall portion 54. A direction in which the first wall portion 53 and the second wall portion 54 face each other is a first direction A, a direction perpendicular to the first direction A is a second direction B, and the direction is perpendicular to the first direction A and the second direction B. Let the direction be a third direction C. The second direction B is a direction in which a pair of wall portions of the side wall 51b that stand from an end extending in the lateral direction of the bottom wall 51a face each other. The third direction C is a direction in which the housing lid 52 and the bottom wall 51a face each other.

The housing 20 includes two shelf boards 60. The two shelf boards 60 are plate-shaped members arranged between the first wall part 53 and the second wall part 54 inside the housing body 51. The two shelf boards 60 are arranged so that the thickness direction thereof is in the first direction A. The two shelf boards 60 are arranged with their positions shifted in the first direction A. The two shelf boards 60 are fixed to a pair of wall portions of the side wall 51b of the housing body 51 that face each other in the second direction B by a fixing means such as welding.

Two suction ports 53a are formed in the first wall portion 53. The two suction ports 53a communicate between the inside and outside of the housing 20 and are formed by the first wall portion 53. The two suction ports 53a are arranged at intervals in the second direction B. The two suction ports 53a extend in the third direction C.

Two discharge ports 54a are formed in the second wall portion 54. The two discharge ports 54a communicate between the inside and outside of the housing 20 and are formed by the second wall portion 54. The two discharge ports 54a are arranged at intervals in the second direction B. The two discharge ports 54a extend in the third direction C. The two discharge ports 54a are arranged to overlap with the two suction ports 53a in the first direction A.

Two communication ports 60a are formed in each of the two shelf boards 60. The two communication ports 60a communicate with both sides of the shelf board 60 and are formed by the shelf board 60. The two communication ports 60a are arranged at intervals in the second direction B. The two communication ports 60a extend in the third direction C. The two communication ports 60a are arranged at positions overlapping the two suction ports 53a in the first direction A. The suction port 53a, the discharge port 54a, and the communication port 60a are arranged at overlapping positions in the first direction A. The suction port 53a, the discharge port 54a, and the communication port 60a have the same shape.

As shown in FIG. 9, the housing 20 houses a plurality of battery modules 10. The plurality of battery modules 10 are housed in the housing 20 such that all the bottom walls 31a of the plurality of battery cases 30 face each other at intervals in the second direction B. That is, the plurality of battery modules 10 are arranged between the first wall part 53 and the second wall part 54 such that all the bottom walls 31a of the plurality of battery cases 30 face each other at intervals in the second direction B. has been done. The bottom walls 31a facing each other in the second direction B form a ventilation channel S, which is a channel through which air flows. The ventilation channel S communicates with the communication port 60a in the first direction A. The suction port 53a, the discharge port 54a, the communication port 60a, and the ventilation flow path S are such that a virtual straight line L extending in the first direction A extends inside each of the suction port 53a, the discharge port 54a, the communication port 60a, and the ventilation flow path S. It is set up so that everything can pass through. That is, in the battery pack 1, a communication passage 55 is formed by the ventilation passage S and the communication port 60a, which communicates the intake port 53a and the discharge port 54a. forms part of it. Note that a fan (not shown) is arranged on the first wall portion 53 so as to cover the suction port 53a.

Even with such changes, the same effects as those described in (1) to (3), (5), and (6) in this embodiment can be obtained.
○ In this embodiment, the inlet 25, the outlet 26, the communication port 27, and the ventilation flow path S are arranged so that the virtual straight line L extending in the first direction A It may be provided so that it does not pass through the inside of each path S entirely. In this case, the suction port 25, the discharge port 26, the communication port 27, and the ventilation channel S may be provided so as to communicate at least in the first direction A. Note that similar changes may be made to the suction port 53a, the discharge port 54a, the communication port 60a, and the ventilation channel S in the above modification example.

In this embodiment, the suction port 25, the discharge port 26, and the communication port 27 have the same shape, but they may have different shapes. Furthermore, in the above modification example, the inlet port 53a, the outlet port 54a, and the communication port 60a do not have to have the same shape.

Further, although the suction ports 25, 53a, the discharge ports 26, 54a, and the communication ports 27, 60a are all one hole, they may be formed of a plurality of holes. As long as the suction port 25, the discharge port 26, the communication port 27, and the ventilation channel S are provided so as to communicate at least in the first direction A, the number of holes may be changed as appropriate. Furthermore, in the above modification example, if the inlet 53a, the outlet 54a, the communication port 60a, and the ventilation channel S are provided so as to communicate at least in the first direction A, the number of holes may be changed as appropriate. It's okay.

The six third plate members 24c in this embodiment and the shelf board 60 in the above modification example may be omitted, and the plurality of battery modules 10 may be directly stacked in the first direction A. In this case, the communication paths 28 and 55 may be formed only by the ventilation flow path S.

○ In this embodiment, the plurality of pillar members 23 are divided into a first pillar group 231 and a second pillar group 232, and each of the first pillar group 231 and second pillar group 232 is composed of four pillar members 23. configured, but not limited to this. For example, each of the first column group 231 and the second column group 232 may be composed of three column members 23. By making this change, the number of the plurality of plate members 24 may be changed to eight, and the casing 20 may be changed to have one inlet port 25 and one outlet port 26. Further, each of the first column group 231 and the second column group 232 may be formed of five or more column members 23, and the number of each of the suction ports 25 and the discharge ports 26 may be three or more.

The inside of the casing 20 has a three-stage configuration, but the number of stages may be changed as appropriate. Along with the change in the number of stages, the number of third plate members 24c provided between the first plate member 24a and the second plate member 24b and the number of shelf boards 60 in the above modification example are changed as appropriate.

In the present embodiment and the modified examples described above, a fan is provided in the housing 20 to cover the inlet ports 25 and 53a, but a fan may be provided to cover the outlet ports 26 and 54a. Note that the fans may be omitted.

DESCRIPTION OF SYMBOLS 1... Battery pack, 10... Battery module, 20... Housing, 23... Pillar member, 24... Plate member, 24a... First plate member, 24b... Second plate member, 24c... Third plate member, 25... Inlet , 26...Discharge port, 27...Communication port, 28...Communication path, 30...Battery case, 31a...Bottom wall (contact wall part), 40...Secondary battery, 43a...Bottom wall, 43c...Outer surface, 53...No. 1 wall part, 53a...intake port, 54...second wall part, 54a...exhaust port, 55...communication path, 60...shelf board, 60a...communication port, 231...first column group, 232...second column group, A...first direction, B...second direction, C...third direction, S...ventilation channel, L...virtual straight line.

Claims (1)

a battery case; and a plurality of battery modules having a plurality of secondary batteries housed inside the battery case;
A battery pack comprising: a casing that accommodates the plurality of battery modules;
The battery case has a contact wall portion against which one side of all the secondary batteries housed in the battery case is in contact,
The casing is
A first wall portion;
a second wall portion located at a position facing the first wall portion;
The casing includes:
an inlet that communicates between the inside and outside of the casing and is formed by at least a portion of the first wall;
an outlet that communicates between the inside and outside of the casing and is formed by at least a portion of the second wall;
When the direction in which the first wall portion and the second wall portion face each other is a first direction, and the direction perpendicular to the first direction is a second direction,
The plurality of battery modules are arranged between the first wall part and the second wall part so that all the contact wall parts in the plurality of battery cases face each other at intervals in the second direction. is,
A communication path is formed inside the casing to communicate the suction port and the discharge port in the first direction,
A ventilation channel through which air flows, which is formed by the contact walls facing each other in the second direction, forms at least a part of the communication path ,
The casing is
A plate-shaped member disposed between the first wall portion and the second wall portion, the plate member being disposed such that the thickness direction is in the first direction and facing the first wall portion. having a shelf board on which a plurality of the battery modules are arranged;
A communication port is formed inside the casing, communicating both sides of the shelf board, being formed by at least a portion of the shelf board, and forming a part of the communication path;
The communication path is formed by the ventilation flow path and the communication port communicating in the first direction,
The suction port, the discharge port, the communication port, and the ventilation flow path are such that a virtual straight line extending in the first direction covers the entire inside of each of the suction port, the discharge port, the communication port, and the ventilation flow path. It is set up so that it passes through
The casing is
a plurality of column members that extend in the first direction so that their axes are parallel and are the same member;
A plurality of plate members having a square plate shape,
If a direction perpendicular to the first direction and the second direction is a third direction,
The plurality of pillar members are
a first column group arranged at intervals in the second direction and constituted by at least three of the column members;
a second column group composed of the column members disposed at positions facing each of the plurality of column members constituting the first column group in the third direction,
The plurality of plate members are
a first plate member provided on one side in the axial direction of the column member and provided in plurality in the second direction, forming the first wall portion;
a second plate member provided on the other side of the column member in the axial direction and provided in plurality in the second direction, forming the second wall portion;
a third plate member provided between the first plate member and the second plate member, provided in plurality in the second direction, and forming the shelf board;
The inlet is formed by the two first plate members adjacent in the second direction and the two pillar members arranged between the two first plate members,
The discharge port is formed by the two second plate members adjacent in the second direction and the two pillar members arranged between the two second plate members,
The communication port is formed by the two third plate members adjacent in the second direction and the two pillar members arranged between the two third plate members. battery pack.