JP2020095860A - Battery pack - Google Patents

Abstract

To provide a battery pack that can prevent uneven heat dissipation from a plurality of battery cells within a case.SOLUTION: A battery pack 13 includes a battery holder 34 provided in the inside F1 of a case 21, a storage chamber 43 partitioned by the battery holder 34, an intake port 29 that introduces air into the inside F1 of the case 21, and an exhaust port 30 that discharges the air from the inside F1 of the case 21 to the outside F2 of the case 21, and further includes a passage J1 formed between the battery holder 34 and the case 21 and connected to the intake port 29, a cooling hole 37 provided in the battery holder 34 and connecting the passage J1 and the storage chamber 43, and a guide member 41 which is arranged between the battery holder 34 and the case 21 and guides the air which has entered the passage J1 from the intake port 29 to the cooling hole 37, and the guide member 41 is arranged in a direction intersecting a straight line G1 connecting the intake port 29 and the exhaust port 30.SELECTED DRAWING: Figure 4

Description

The present invention relates to a battery pack having a plurality of battery cells and a casing accommodating the plurality of battery cells.

Conventionally, a battery pack having a plurality of battery cells and a case accommodating the plurality of battery cells has been known, and an example of the battery pack is described in Patent Document 1.

The battery pack described in Patent Document 1 has a case and a battery holder. It has an inlet and an outlet. The introduction port and the exhaust port are air passages, and the introduction port and the exhaust port are formed in the case.

The battery holder is provided in the case between the introduction port and the exhaust port. An inner space of the battery holder is partitioned into a plurality of spaces, and a plurality of battery cells are housed in the battery holder. As a set of two duct walls, two sets of duct walls are provided in the internal space of the electric cage. A medium flow path is formed between two sets of duct walls. The plurality of battery cells are provided in the medium flow path. A bypass duct is provided between the two duct walls.

In the battery pack described in Patent Document 1, cooling air is introduced into the introduction port of the case. When the cooling air flows through the medium flow path, heat is exchanged between the air and the battery cells, and the air whose temperature has risen due to the heat exchange is discharged from the exhaust port to the outside of the case. Further, the air flowing through the bypass duct does not come into contact with the battery cell near the introduction port, but flows into the medium flow path when approaching the exhaust port, and exchanges heat with the battery cell.

JP, 10-255859, A

The inventor of the present application has recognized the problem that the heat radiation state of a plurality of battery cells may be non-uniform in the case.

An object of the present invention is to provide a battery pack that can prevent the heat dissipation state of a plurality of battery cells from becoming non-uniform in the case.

The battery pack of the present invention includes a case, a battery holder provided inside the case, an accommodation chamber that is partitioned by the battery holder to accommodate a plurality of battery cells, and an intake port that introduces air into the case. And an exhaust port for discharging air inside the case to the outside of the case, the battery pack being formed between the battery holder and the case, and being connected to the intake port. A passage, a cooling hole that is provided in the battery holder and connects the passage and the storage chamber, and is arranged between the battery holder and the case, and enters the passage from the intake port. And a guide member for guiding the air to the cooling hole, and the guide member is arranged in a direction intersecting a straight line connecting the intake port and the exhaust port.

According to the battery pack of the present invention, it is possible to prevent the heat radiation state of the plurality of battery cells from becoming non-uniform in the case.

It is a typical longitudinal cross-sectional view of a power supply device provided with a plurality of battery packs of the present invention. It is a front view of a battery pack. It is a rear view of a battery pack. It is a plane sectional view of a battery pack. It is a right view of a battery pack. It is a perspective view which removed the cover from a battery pack. It is an exploded perspective view of a battery module. It is a plane sectional view showing other examples of shape of a guide member and other examples of arrangement provided in a battery pack. It is a perspective view which shows the other example of a battery pack. It is a perspective view of the battery pack which has two sets of battery modules. It is a plane cross section of the battery pack shown in FIG.

Hereinafter, an embodiment of a battery pack of the present invention will be described with reference to the drawings. In all the drawings for explaining the embodiments, the same parts are designated by the same reference numerals in principle, and the repeated description thereof will be omitted.

The battery system 10 shown in FIGS. 1, 2, and 3 is used for wind power generation, solar power generation, or the like, for example. The battery system 10 includes a cubicle 11, a cooling fan 12, and a plurality of battery packs 13. The cubicle 11 is an outer box forming the arrangement space 14. The cubicle 11 has a front plate 15, a top plate 16 and a back plate 17. The front plate 15 is a door attached to the cubicle 11 so as to be openable and closable. An intake port 18 is provided in the front plate 15, and an exhaust port 19 is provided in the upper plate 16. A plurality of shelf boards 20 are provided in the arrangement space 14 substantially horizontally and side by side in the vertical direction. The battery packs 13 are placed on the shelf boards 20, respectively.

The exhaust port 19 is arranged above the intake port 18. The exhaust port 19 is provided above the space between the shelf plate 20 and the back plate 17. The fan 12 is provided outside the cubicle 11, above the upper surface plate 16, specifically, above the exhaust port 19.

When the fan 12 rotates, the pressure in the arrangement space 14, particularly the space between the shelf plate 20 and the back plate 17, is reduced. Therefore, the cooling medium of the outside E1 of the cubicle 11, that is, the air is sucked into the arrangement space 14 from the intake port 18. Heat exchange is performed between the air sucked into the arrangement space 14 and the battery pack 13, and the temperature rise of the battery pack 13 is suppressed. The air from which the heat of the battery pack 13 is removed passes through the exhaust port 19 and is discharged to the outside E1 of the cubicle 11.

Regarding the structure of the battery system 10, for example, it is possible to carry in and carry out into a general elevator, do not obstruct the work passage on the front side of the battery system 10 when the front plate 15 is opened and closed, and other dimensional restrictions. There is. In addition, the width of the battery system 10 has an appropriate upper limit. Due to these restrictions, the overall size of the plurality of battery packs 13 is generally a structure in which a space is formed in the front-back direction of the arrangement space 14 of the battery system 10.

Further, in the battery system 10, a plurality of battery packs 13 are stacked and installed on a multi-tiered shelf board 20 in the battery system 10 so that the entire voltage and capacity can be expanded. Alternatively, the electric wire connected to each battery pack 13 from the back plate 17 is generally wired to the outside E1. With this method, a configuration in which the battery system 10 is part of a larger system, for example, an installation mode in which a plurality of battery packs 13 are densely aligned in the arrangement space 14 is possible, and the battery system 10 is small in size. Can also contribute to

For example, in the battery system 10 in which the battery packs 13 are aligned left and right, the battery system 10 as a whole flows the cooling medium in the front-rear direction or the vertical direction. In particular, the exhaust port 19 is generally provided above the arrangement space 14, and the intake port 18 is generally provided in the front surface of the arrangement space 14. This is because when the fan 12 fails, it is possible to promote natural convection by taking in air from the intake port 18 into the arrangement space 14, and when arranging a plurality of battery systems 10 side by side, the rear plates 17 are separated from each other. This is because they can be arranged together, and there is no need to construct a ventilation pit or the like in the lower portion of the battery system 10, which is advantageous.

FIG. 4, FIG. 5, FIG. 6 and FIG. 7 are views showing one battery pack 13. The battery pack 13 includes a case 21 and a single battery module 22 housed in the inside F1 of the case 21. The case 21 is made of a material having a function as a partition that partitions the inside F1 and the outside F2 of the case 21. The case 21 is made of metal or synthetic resin, for example. The outside F2 of the case 21 corresponds to the arrangement space 14 of the cubicle 11.

The case 21 has a top plate 23, a bottom plate 24, and four side plates 25, 26, 27, 28. When the case 21 is viewed from the side as shown in FIG. 5, the top plate 23 and the bottom plate 24 are arranged in parallel with each other. When the case 21 is viewed in a plan view, the top plate 23 and the bottom plate 24 have a substantially quadrangular planar shape, for example, a rectangle or a square. The four side plates 25, 26, 27, 28 are provided so as to be connected to the respective sides of the bottom plate 24. The four side plates 25, 26, 27, 28 are substantially perpendicular to the bottom plate 24.

When the case 21 is viewed in plan as in FIG. 4, the side plate 25 and the side plate 26 are arranged in parallel with each other, and the side plate 27 and the side plate 28 are arranged in parallel with each other. The side plate 25 is connected to the side plate 28 at a right angle, and the side plate 26 is connected to the side plate 27 at a right angle. The bottom plate 24 and the four side plates 25, 26, 27, 28 form a box. The top plate 23 can be attached and detached to/from the four side plates 25, 26, 27, 28 that are opposite to the places connected to the bottom plate 24. The top plate 23 functions as a lid that opens and closes the opening of the box.

The case 21 has an intake port 29 and an exhaust port 30. When the case 21 is viewed in a plan view, the intake port 29 and the exhaust port 30 are located on a straight line G1 connecting two facing corners of the four corners of the case 21. The intake port 29 and the exhaust port 30 are connected to the inside F1 and the outside F2, respectively. When the fan 12 shown in FIG. 2 rotates and air is sucked into the arrangement space 14, the air in the outside F2 of the case 21 shown in FIG. 4 is sucked into the inside F1 from the intake port 29 and outside from the exhaust port 30. It is discharged to F2.

The battery module 22 is arranged in the inside F1. The intake passage 31 and the exhaust passage 32 are formed in the inside F1. When the case 21 is viewed in a plan view, the intake passage 31 is formed between the battery module 22 and the side plate 26. The intake passage 31 is a band-shaped space formed along the side plate 26. The intake passage 31 is connected to the intake port 29. When the case 21 is viewed from above, the exhaust passage 32 is formed between the battery module 22 and the side plate 25. The exhaust passage 32 is a band-shaped space formed along the side plate 25. The exhaust passage 32 is connected to the exhaust port 30. When the case 21 is viewed in a plan view, the intake passage 31 and the exhaust passage 32 are arranged parallel to each other.

The battery module 22 has a plurality of battery cells 33, two battery holders 34 and 35, and a cell partition wall 40. The battery cell 33 is a unit battery having a columnar outer shape. If the battery cell 33 is, for example, a lithium ion battery, it may be a cylindrical single battery. 4, 5 and 7 show examples in which the battery cell 33 has a cylindrical shape.

The battery holders 34 and 35 are both plate-shaped. In the plan view of the case 21, the battery holders 34 and 35 are each quadrangular, for example, substantially rectangular or square. The plan view of the case 21 is synonymous with the plan view of the battery holders 34 and 35. When the case 1 is viewed from the side as in FIG. 5, the battery holders 34 and 35 are arranged parallel to the top plate 23 and the bottom plate 24. The battery holder 34 is arranged between the top plate 23 and the battery holder 35 in the vertical direction of the case 21. A passage J1 is formed between the top plate 23 and the battery holder 34. The passage J1 is connected to the intake passage 31 and the exhaust passage 32.

Further, the battery holder 35 is arranged between the bottom plate 24 and the battery holder 34 in the vertical direction of the case 21 shown in FIG. For the battery holders 34 and 35, plate-shaped and electrically insulating materials, for example, resin molded products such as plastics can be used. A passage J2 is formed between the bottom plate 24 and the battery holder 35. The passage J2 is connected to the intake passage 31 and the exhaust passage 32.

A plurality of battery support portions 36 are provided on the battery holder 34, and a plurality of battery support portions 36 are provided on the battery holder 35. The plurality of battery support portions 36 and the four side plates 25, 26, 27, 28 are arranged in a plurality of rows and in a grid pattern so as to be parallel to each other. All the battery support portions 36 are provided on the surfaces of the battery holder 34 and the battery holder 35 that face each other.

When the case 21 is viewed in plan, the plurality of battery supporting portions 36 provided on the battery holder 34 and the plurality of battery supporting portions 36 provided on the battery holder 35 are arranged at the same position. As shown in FIG. 5, the battery support portion 36 provided on the battery holder 34 and the battery support portion 36 provided on the battery holder 35 support one battery cell 33. The center line H1 of all the battery cells 33 is perpendicular to the surface of the battery holder 34 and the surface of the battery holder 35. A storage chamber 43 is formed between the battery holder 34 and the battery holder 35. All the battery cells 33 and the cell partition walls 40 are arranged in the accommodation chamber 43. The battery holder 34 and the battery holder 35 partition the accommodation chamber 43 by the inside F1.

The plurality of battery cells 33 supported by the plurality of battery support portions 36 are arranged in parallel with the side plates 25, 26, 27, 28 and in a plurality of rows. A plurality of battery cells 33 groups are set as one row, and a plurality of rows are arranged. The plurality of battery support portions 36 is a mechanism that maintains a predetermined space between the adjacent battery cells 33. The plurality of battery support portions 36 may be, for example, ribs having a shape corresponding to the battery cells 33, counterbore holes, or the like.

Cooling holes 37 are provided in the battery holders 34 and 35, respectively. The cooling hole 37 penetrates the battery holders 34 and 35 in the thickness direction, that is, penetrates the battery holders 34 and 35 in a substantially vertical direction. The cooling hole 37 connects the passages J1 and J2 and the storage chamber 43. In plan view of the case 21, the cooling hole 37 may be provided at the same position as the battery supporting portion 36, or may be provided at a position different from the battery supporting portion 36. Further, the cooling holes 37 are arranged so as to be substantially evenly distributed in the plane direction of the battery holders 34 and 35 in a plan view of the case 21.

In the plan view of the case 21, for example, among the plurality of battery cells 33 arranged in a grid, the cooling holes 37 are provided at the positions corresponding to the spaces formed between the four battery cells 33 adjacent to each other. It is also possible to arrange. By providing the cooling holes 37, it is possible to prevent air from staying between the battery cells 33 when the plurality of battery cells 33 are densely arranged.

Conductive portions 38 are provided on the battery holders 34 and 35, respectively. The conductive portion 38 is an element that electrically connects the adjacent battery cells 33 to each other, and the conductive portion 38 is arranged along the plane direction of the battery holders 34 and 35. Here, the conductive portion 38 is formed in a plate or foil shape using, for example, copper, nickel, aluminum or the like as a base material. A structure in which the battery holders 34 and 35 are sandwiched between the battery cell 33 and the conductive portion 38, a structure in which the conductive portion 38 is sandwiched between the battery cell 33 and the battery holders 34 and 35, and a conductive portion 38 is formed in the resin battery holders 34 and 35. Any structure of insert molding may be used. The battery cell 33 and the conductive portion 38 may be connected by pressure welding or welding.

The collector terminal 39 is connected to the conductive portion 38. The collector terminal 39 is an output terminal of the battery module 22. The current collecting terminal 39 can output the maximum voltage and the maximum current of the battery module 22. By connecting the electric wire to the collector terminal 39, the electric power stored in the battery module 22 can be taken out of the case 21 through the electric wire.

The cell partition wall 40 is provided between the battery holder 34 and the battery holder 35. The cell partition wall 40 has a substantially flat plate shape, and the cell partition wall 40 is formed of, for example, a nonflammable material such as metal or ceramic. A plurality of cell partition walls 40 are arranged between the side plates 27 and 28. When the case 21 is viewed in plan as shown in FIG. 4, all the cell partition walls 40 are arranged parallel to the side plates 27 and 28. Further, the cell partition walls 40 are arranged in parallel with each other. The cell partition walls 40 are respectively arranged between the rows of the plurality of battery cell 33 groups and the rows of the plurality of battery cell 33 groups.

Guide members 41 are arranged in the passages J1 and J2, respectively. The guide member 41 may be any one that has a function as a barrier that blocks the flow of air as a cooling medium or that changes the flow direction of air. The guide member 41 may be a plate material made of iron or aluminum, a metal plate material containing other alloys, or a resin plate material such as plastic. The guide member 41 may be a flexible material such as synthetic rubber or sponge, or may be a structure in which these materials are combined by lamination or the like. As the material having pores such as sponge, it is preferable to select a material having a small pore diameter or a material having a thickness in the flow passage direction so as to prevent the air flow.

Further, the guide member 41 can be arranged in either the passage J1 or the passage J2. Either the structure in which the guide member 41 is fixed to the case 21 or the structure in which the guide member 41 is fixed to at least one of the battery holders 34 and 35 may be used. As a method of fixing the guide member 41, any method such as screw fastening, welding, adhesive tape or the like may be adopted.

The guide member 41 shown in FIG. 4 includes a first constituent portion 41A, a second constituent portion 41B, and a connecting portion 41C in a plan view of the case 21. In the guide member 41 shown in FIG. 4, both the first component portion 41A and the second component portion 41B are linearly arranged in a plan view of the case 21. In the guide member 41 shown in FIG. 4, the first constituent portion 41A is parallel to the side plates 25 and 26 in a plan view of the case 21. 41 A of 1st structure parts are arrange|positioned in the substantially triangular space formed between the side plates 26 and 27 and the straight line G1.

The connecting portion 41C connects the first constituent portion 41A and the second constituent portion 41B. The second component 41B is inclined with respect to the first component 41A. That is, the second component 41B is inclined so as to approach the side plate 25 as the second part 41B approaches the side plate 28 from the connection part 41C. In other words, in the passages J1 and J2, the area of the passage through which air can flow, which is formed between the second component portion 41B and the side plate 28, decreases as the air passage 31 approaches the exhaust passage 32.

The first component 41A may be in contact with the side plate 27 or may be separated from the side plate 27. The second component 41B may be in contact with the side plate 28 or may be separated from the side plate 28.

The entire guide member 41 shown in FIG. 4 is bent with the connecting portion 41C as a boundary in a plan view of the case 21. Further, when the case 21 is viewed in a plan view, the first constituent portion 41A is arranged between the intake passage 31 and the second constituent portion 41B in the direction along the side plates 27 and 28. Further, when the case 21 is viewed in a plan view, the first constituent portion 41A is arranged between the side plate 27 and the second constituent portion 41B in the direction along the side plates 25 and 26. Furthermore, the second component 41B is arranged between the first component 41A and the side plate 28 in the direction along the side plates 25, 26.

In the plan view of the case 21, the straight line G1 described above passes through the points A1 and B1. The point A1 is the center of the battery cell 33 closest to the intake port 29, and the point B1 is the center of the battery cell 33 closest to the exhaust port 30. The vector C1 indicates the direction of air flowing between the cell partition walls 40. The vector C1 is a straight line parallel to the cell partition wall 40 and the side plates 27 and 28. In plan view of the case 21, the second component 41B is arranged so as to intersect with the vector C1 and intersect with the straight line G1. The angle θ1 formed between the second component 41B and the straight line G1 is preferably 90 degrees.

Next, the function of the battery pack 13 shown in FIGS. 4, 5, 6 and 7 will be described. When the battery module 22 is charged or discharged, the battery cells 33, the conductive portion 38, etc. generate heat due to Joule loss. On the other hand, when the fan 12 shown in FIG. 2 rotates and air is sucked into the arrangement space 14, the air in the outside F2 of the case 21 shown in FIG. 4 flows into the intake passage 31 from the intake port 29. The air flowing through the intake passage 31 is distributed to the accommodation chamber 43 and the passages J1 and J2.

The air that has entered the storage chamber 43 passes between the cell partition walls 40, between the cell partition walls 40 and the side plates 27, and between the cell partition walls 40 and the side plates 28, respectively. Then, the surfaces of the battery cells 33 come into contact with the air to perform heat exchange, the heat of the battery cells 33 is transferred to the air, and the temperature rise of the battery cells 33 is suppressed. The air that has taken the heat of the battery cells 33 and has increased in temperature is discharged from the accommodation chamber 43 to the exhaust passage 32. Further, the air that has passed through the passages J1 and J2 and the air that has passed through the storage chamber 43 merge in the exhaust passage 32, and are discharged from the exhaust port 30 to the outside F2.

In this way, the temperature rise of the battery pack 13 is suppressed, and the battery pack 13 can continue charging and discharging without excessive temperature rise.

The air flowing through the intake passage 31 easily flows along a path near the exhaust port 30. Therefore, in a region near the side plate 28, the flow velocity and flow rate of air may decrease.

In the present embodiment, the air flowing from the intake port 29 into the passages J1 and J2 tends to flow along the straight line G1 which is the shortest distance connecting the intake port 29 and the exhaust port 30. However, the guide member 41 is provided in at least one of the passages J1 and J2. Therefore, the air that has entered the passages J1 and J2 mainly flows along the second constituent portion 41B, and the air flows in a direction away from the exhaust port 30, that is, toward the side plate 28. As a result, the air flowing through at least one of the passages J1 and J2 enters the accommodation chamber 43 through the cooling hole 37.

Then, in the region close to the side plate 28 in the region close to the exhaust passage 32 in the flow direction of the air from the intake passage 31 to the exhaust passage 32, the flow velocity and flow rate of the air flowing through the accommodation chamber 43 increase, and Forced convection of the contacting air is promoted. That is, it is possible to prevent the air from locally settling. Therefore, in FIG. 4 which is a plan view of the case 21, it is possible to prevent the heat dissipation states of the plurality of battery cells 33 from becoming non-uniform.

Further, when the cell partition wall 40 is made of a non-flammable material, even if a thermal failure occurs in any of the battery cell 33 group rows, the thermal failure occurs in the battery cell 33 group row. It is possible to suppress the influence from being propagated to the columns of the adjacent battery cell groups 33.

Further, when the number of the battery cells 33 arranged in a row along the side plates 27, 28 is smaller than the number of the battery cells 33 arranged in a row along the side plates 25, 26, the space partitioned by the cell partition walls 40. It is possible to reduce the number of the battery cells 33 arranged in the.

FIG. 8 shows another shape example and another arrangement example of the guide member 41. A plurality of guide members 41 are arranged in at least one of the passages J1 and J2. The guide member 41 includes a linear member and an arc member in a plan view of the case 21. Each of the guide members 41 is arranged in a direction intersecting the straight line G1. The plurality of guide members 41 are arranged on both sides of the straight line G1. Therefore, in FIG. 8 which is a plan view of the case 21, it is possible to prevent the heat dissipation states of the plurality of battery cells 33 from becoming non-uniform.

FIG. 9 is another configuration example of the battery pack 13. The blocking member 42 is provided in the inside F1 of the case 21. The blocking member 42 is an element that closes the cooling hole 37. The blocking member 42 is arranged at a position closer to the intake passage 31 than the exhaust passage 32 in the direction along the vector C1 among the plurality of cooling holes 37 provided in the battery holder 34, and as close to the intake port 29 as possible. Close what is placed in. The blocking member 42 is arranged in a space surrounded by the second component 41B, the side plate 26, and the side plate 28 in a plan view of the case 21.

The blocking member 42 only needs to be capable of closing the cooling hole 37 of the battery holder 34. For example, the blocking member 42 can be made of a synthetic resin plate-shaped material attached to the surface of the battery holder 34. The blocking member 42 may be one in which the cooling hole 37 is filled with an object or may be packed. As the object to be filled in the cooling holes 37, putty, paste, fiber material or the like can be used. The blocking member 42 may be provided on the battery holder 35.

Other configurations of the battery pack 13 shown in FIG. 9 are the same as the configurations of the battery pack 13 shown in FIGS. 4, 5 and 6. The battery pack 13 shown in FIG. 9 can obtain the same effect as the battery pack 13 shown in FIGS. 4, 5 and 6. In the battery pack 13 shown in FIG. 9, air does not pass through the cooling holes 37 covered by the blocking member 42, and the air does not enter the accommodation chamber 43 at a position near the intake passage 31. The air flowing through the passage J1 approaches the exhaust passage 32 as much as possible, and then enters the accommodation chamber 43 through the cooling hole 37. As a result, the air can enter from the passages J1 and J2 in the air flow direction in the storage chamber 43 as far downstream as possible, that is, at a position near the exhaust passage 32. Therefore, the temperature distribution of the battery module 22 can be efficiently made uniform.

Further, the linear edge of the blocking member 42 shown in FIG. 9 is arranged parallel to the second component portion 41B of the guide member 41. Therefore, the air passing through the cooling holes 37 is substantially evenly dispersed in the accommodation chamber 43, and the temperature distribution of the battery module 22 can be further uniformized.

Still another example of the battery pack 13 will be described with reference to FIGS. 10 and 11. The battery pack 13 has two battery modules 22A and 22B provided in the inside F1 of the case 21. Further, two intake ports 29A and 29B are provided, and two intake passages 31A and 31B are provided.

The battery module 22A is arranged between the side plate 25 and the exhaust passage 32. The battery module 22B is arranged between the side plate 26 and the exhaust passage 32. An intake passage 31A is arranged between the side plate 25 and the battery module 22A, and an intake passage 31B is arranged between the side plate 26 and the battery module 22B.

The battery modules 22A and 22B each have the same configuration as the battery module 22. When the battery pack 13 is viewed in plan as shown in FIG. 11, the two battery modules 22A and 22B are line-symmetrical with the exhaust passage 32 therebetween.

The auxiliary intake port 44 is provided in the side plate 28. The auxiliary intake port 44 connects the external F2 and the exhaust passage 32. The auxiliary air intake port 44 is arranged between the battery module 22A and the battery module 22B in the direction along the vector C1. The cross-sectional area of the auxiliary intake port 44 is smaller than the cross-sectional areas of both the intake port 29A and the intake port 29B in the plane perpendicular to the air flow direction.

The battery module 22A has a blocking member 45. The blocking member 45 blocks a part of a path through which the air in the intake passage 31A flows into the accommodation chamber 43. The blocking member 45 is arranged in a region of the intake passage 31A near the exhaust port 30.

The battery module 22B has a blocking member 45. The blocking member 45 blocks a part of the path through which the air in the intake passage 31B flows into the storage chamber 43. The blocking member 45 is arranged in a region of the intake passage 31B near the exhaust port 30.

In the battery pack 13 shown in FIGS. 10 and 11, the air sucked into the intake passage 31A from the intake port 29A takes the heat of the battery module 22A and then reaches the exhaust passage 32. Further, the air sucked into the intake passage 31B from the intake port 29B removes heat from the battery module 22B and then reaches the exhaust passage 32. That is, the air that has cooled the battery module 22A and the air that has cooled the battery module 22B merge in the exhaust passage 32 and are discharged from the exhaust port 30 to the outside F2 of the case 21.

The battery pack 13 shown in FIGS. 10 and 11 can obtain the same effects as those of the battery pack 13 shown in FIGS. 4, 5, 6, and 9. In the battery pack 13 shown in FIGS. 10 and 11, the air in the external F2 can pass through the auxiliary intake port 44 and bypass the intake ports 29A, 29B and the intake passages 31A, 31B to enter the exhaust passage 32. is there.

The opening degree of the auxiliary intake port 44 changes the gradient of the pressure and temperature of the exhaust passage 32. Therefore, the temperature of each row of the plurality of battery cells 33 becomes uniform by changing the opening degree of the auxiliary intake port 44 according to the number of rows and columns of the plurality of battery cells 33 arranged in a grid pattern. Thus, the pressure and flow rate of the cooling air flowing between the cell partition walls 40 can be adjusted.

Further, the cross-sectional area through which the air flows is narrowed by the blocking member 45 while the air enters the accommodation chamber 43 of the battery module 22A from the intake passage 31A. Therefore, the pressure loss of the air increases, and the velocity of the air in the region near the exhaust port 30 in the storage chamber 43 can be reduced. Therefore, the temperature distribution of the plurality of battery cells 33 in the accommodation chamber 43 of the battery module 22A can be made uniform.

Furthermore, the cross-sectional area through which air flows is narrowed by the blocking member 45 in the process in which air enters the accommodation chamber 43 of the battery module 22B from the intake passage 31B. Therefore, the pressure loss of the air increases, and the velocity of the air in the region near the exhaust port 30 in the storage chamber 43 can be reduced. Therefore, the temperature distribution of the plurality of battery cells 33 in the accommodation chamber 43 of the battery module 22B can be made uniform.

An example of the technical meaning of the items disclosed in the present embodiment is as follows. The battery pack 13 is an example of a battery pack. The case 21 is an example of a case. The battery modules 22, 22A, 22B are examples of battery modules. The battery holder 34 is an example of a first battery holder, and the battery holder 35 is an example of a second battery holder. The battery cell 33 is an example of a battery cell. The accommodation chamber 43 is an example of an accommodation chamber. The intake ports 29, 29A, 29B are examples of intake ports. The exhaust port 30 is an example of an exhaust port. The passages J1 and J2 are examples of passages. The passage J1 is an example of a first passage, and the passage J2 is an example of a second passage. The cooling hole 37 is an example of a cooling hole. The guide member 41 is an example of a guide member. The straight line G1 is an example of a straight line.

The intake passage 31 is an example of the intake passage. The exhaust passage 32 is an example of an exhaust passage. The center line H1 is an example of the center line of the battery cell. The cell partition 40 is an example of a partition. The inside F1 is an example of the inside of the case. The outside F2 is an example outside the case. The blocking member 45 is an example of a blocking member.

The battery pack is not limited to the one disclosed with reference to the drawings in the present embodiment, and can be variously modified without departing from the gist thereof. For example, the guide member 41 may be provided in both the passages J1 and J2, or may be provided in either one of the passages J1 and J2. Furthermore, the cell partition 40 may or may not be provided. Furthermore, the blocking member 45 shown in FIGS. 10 and 11 can be provided in the battery pack 13 shown in FIGS. 4, 5, 6, 8 and 9. The arrangement of the guide member in the direction intersecting with the straight line connecting the intake port and the exhaust port includes those in which the guide member and the straight line intersect and those in which the guide member and the straight line do not intersect. In other words, it only has to intersect as a direction. That is, the straight line may be located on the extension of the guide member.

13... Battery pack, 21... Case, 22, 22A, 22B... Battery module, 29, 29A, 29B... Intake port, 30... Exhaust port, 31... Intake passage, 32... Exhaust passage, 33... Battery cell, 34, 35 ...Battery holder, 37... Cooling hole, 40... Cell partition wall, 41... Guide member, 43... Storage chamber, 45... Blocking member, F1... Inside, F2... Outside, G1... Straight line, H1... Center line, J1, J2... aisle

Claims (7)

A case; a battery holder provided inside the case; an accommodation chamber that is partitioned by the battery holder to accommodate a plurality of battery cells; an intake port that introduces air into the case; and an interior of the case. A battery pack having an exhaust port for discharging air to the outside of the case,
A passage formed between the battery holder and the case, and connected to the intake port,
A cooling hole provided in the battery holder and connecting the passage and the storage chamber,
A guide member that is arranged between the battery holder and the case, and that guides air that has entered the passage from the intake port to the cooling hole;
Have
The battery pack, wherein the guide member is arranged in a direction intersecting with a straight line connecting the intake port and the exhaust port. The battery pack according to claim 1,
The battery holder has a plate-shaped first battery holder and a plate-shaped second battery holder arranged in parallel to each other,
The accommodation chamber is formed between the first battery holder and the second battery holder,
The passage is
A first passage formed between the first battery holder and the case;
A second passage formed between the second battery holder and the case;
Have
The guide member is disposed between at least one of the first battery holder and the case, or between the second battery holder and the case,
In a plan view of the first battery holder and the second battery holder, the guide member is arranged in a direction intersecting a straight line connecting the intake port and the exhaust port. The battery pack according to claim 1 or 2,
An air intake passage that distributes air that has entered the inside of the case from the air inlet into the storage chamber and the passage;
Air that has passed through the storage chamber and the passage merges, and an exhaust passage that guides the merged air to the exhaust port,
Is further provided,
A battery pack in which the intake passage and the exhaust passage are arranged in parallel to each other in a plan view of the battery holder. The battery pack according to claim 2,
Each of the plurality of battery cells has a cylindrical shape,
A battery pack in which a center line of each of the plurality of battery cells is perpendicular to a surface of the first battery holder and a surface of the second battery holder. The battery pack according to claim 3,
With the plurality of battery cells arranged from the intake passage toward the exhaust passage as one row, the plurality of battery cells are arranged in the storage chamber in a plurality of rows,
A battery pack, wherein a partition wall is provided between the rows of the plurality of battery cells. The battery pack according to claim 3 or 5,
A plurality of battery modules including the battery holder, the storage chamber, and the plurality of battery cells are provided inside the case,
The exhaust passage is formed between the battery modules,
The battery pack further comprising an auxiliary intake port through which air outside the case bypasses the intake port and can enter the exhaust passage. The battery pack according to claim 3 or 5,
The battery pack, further comprising a blocking member that blocks a part of a path through which the air in the intake passage flows into the storage chamber.

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