Cell holder, battery module, and battery pack

Abstract

The purpose of the present invention is to promote heat dissipation of a plurality of battery cells. The cell holder (102) holds a battery row (S1, S2, S3, S4, S5, S6, S7) in which a plurality of battery cells (S) are arranged in a first direction intersecting the axial direction of the battery cells (S). The unit holder (102) is provided with a holding section (104) and an opening section (105). The holding unit (104) holds the battery rows (S1, S2, S3, S4, S5, S6, S7) such that the battery rows (S1, S2, S3, S4, S5, S6, S7) are arranged at intervals in a second direction intersecting both the axial direction and the first direction. The opening part (105) allows gas to enter and exit between the battery rows (S1, S2, S3, S4, S5, S6, S7) held by the holding part (104).

Description

Technical Field

[0001] This invention relates to cell holders, battery modules, and battery packs. Background Technology

[0002] The battery module described in Patent Document 1 includes multiple battery cells, a module housing, a busbar, and a current collector. Engaging protrusions and guide grooves are formed on the outer wall of the module housing for guiding the placement of other battery modules. The module housing includes an upper housing and a lower housing.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent No. 6768968 Summary of the Invention

[0006] The problem to be solved by the present invention

[0007] In the battery module of Patent Document 1, the outer surfaces of multiple battery cells are completely surrounded by a first receiving portion of the upper housing and a second receiving portion of the lower housing. This makes it difficult for air to contact the multiple battery cells, potentially hindering heat dissipation from the cells. Therefore, there is room for improvement in promoting heat dissipation from the multiple battery cells.

[0008] The purpose of this invention is to promote heat dissipation of multiple battery cells.

[0009] Problem-solving methods

[0010] The cell holder of this embodiment is used to hold multiple battery rows in which multiple battery cells are arranged in a first direction intersecting the axial direction of the battery cells. The cell holder includes: a holding portion that holds the multiple battery rows in such a way that the multiple battery rows are arranged at intervals in a second direction intersecting both the axial direction and the first direction; and an opening portion that allows gas to enter and exit between the multiple battery rows held in the holding portion.

[0011] The battery module of this embodiment includes: a plurality of battery columns, wherein a plurality of battery cells are arranged in a first direction intersecting the axial direction of the battery cells; and a cell holder, which holds the plurality of battery columns in such a way that they are spaced apart in a second direction intersecting both the axial direction and the first direction; wherein each of the plurality of battery columns has battery cells arranged with the polarity of the terminal portions of the battery cells being consistent, and the polarity of the terminal portions of the plurality of battery columns is alternately different in the second direction.

[0012] The battery pack of this embodiment includes: a plurality of battery columns arranged in a first direction intersecting the axial direction of the battery cells; a cell holder that holds the plurality of battery columns in such a way that they are spaced apart in a second direction intersecting both the axial direction and the first direction; a conductive portion extending in the first direction and electrically connecting the terminal portions of the plurality of battery cells; and a housing portion that houses the plurality of battery columns, the cell holder, and the conductive portion, including a pair of sidewalls spaced apart in the first direction, the pair of sidewalls having holes that open in the first direction.

[0013] Effects of the present invention

[0014] The cell holder, battery module, and battery pack according to this embodiment can promote heat dissipation of multiple battery cells. Attached Figure Description

[0015] Figure 1 This is a perspective view showing the appearance of the battery pack according to the first embodiment.

[0016] Figure 2 This is an exploded view of the battery pack according to the first embodiment of the present invention.

[0017] Figure 3 This is a top view showing the cell group of the battery pack according to the first embodiment.

[0018] Figure 4 This is a perspective view showing the state of the lower housing and lower guide member of the battery pack according to this first embodiment, as viewed from an obliquely upward angle.

[0019] Figure 5 This is a perspective view showing the state of the upper housing and upper guide member of the battery pack according to this first embodiment, as viewed from a slightly lower angle.

[0020] Figure 6 This is a perspective view showing the busbar portion of the battery pack according to the first embodiment.

[0021] Figure 7 This is a perspective view of a module assembly in which two battery modules according to the first embodiment are provided with busbar sections.

[0022] Figure 8 This is a top view showing the arrangement of multiple battery rows and upper and lower busbars in the battery pack according to the first embodiment.

[0023] Figure 9 This is a perspective view of the battery module according to the first embodiment.

[0024] Figure 10 This is a bottom view of the first component of the battery pack according to the first embodiment, viewed from below.

[0025] Figure 11 This is a perspective view of the first component of the battery pack according to the first embodiment after it has been flipped upside down.

[0026] Figure 12 This is a top view of the second component of the battery pack according to the first embodiment.

[0027] Figure 13 This is a perspective view of the second component of the battery pack according to this first embodiment, viewed from an oblique angle.

[0028] Figure 14A This is a side view showing the state in which the first component of the battery pack according to this first embodiment is flipped upside down and placed on the upper housing.

[0029] Figure 14B It means Figure 14A The first component is a side view showing the lower part of the multiple battery cells.

[0030] Figure 14C It means Figure 14B A side view of the state in which the upper part of the multiple battery cells is held in place by a second component.

[0031] Figure 14D It means in Figure 14C A side view of the second component with the busbar and terminals installed.

[0032] Figure 14E It means in Figure 14D A side view of the first component with the busbar and terminals installed.

[0033] Figure 15 It means from Figure 1 A top view of the battery pack after the upper casing has been removed.

[0034] Figure 16 yes Figure 7 Cross-sectional view of the battery module shown. Figure 7 (AA-line cross-section diagram).

[0035] Figure 17 This is an explanatory diagram showing the flow of air between multiple battery rows of the battery pack according to the first embodiment.

[0036] Figure 18 This is an explanatory diagram showing the flow of air inside the battery pack according to the first embodiment and between multiple battery rows.

[0037] Figure 19This is a plan view showing the configuration relationship between the housing portion and the two battery modules of the battery pack according to the second embodiment.

[0038] Figure 20 This is an explanatory diagram showing the first and second intervals of the battery pack according to this second embodiment.

[0039] Figure 21 This is a perspective view of the battery pack according to the third embodiment of the present invention.

[0040] Figure 22 This is a perspective view showing the state of the battery pack according to this third embodiment after the upper casing has been removed.

[0041] Figure 23 This is an explanatory diagram showing the first and second intervals of the battery pack according to the third embodiment.

[0042] Figure 24 This is a perspective view of the battery pack according to the fourth embodiment of the present invention.

[0043] Figure 25 This is an exploded view of the battery pack according to the fourth embodiment of this invention.

[0044] Figure 26 This is a perspective view showing the battery pack according to the fourth embodiment with the upper casing removed.

[0045] Figure 27 This is an explanatory diagram showing the flow of air inside the battery pack and between multiple battery rows according to the fourth embodiment. Detailed Implementation

[0046] Hereinafter, the first, second, third, and fourth embodiments will be described in detail with reference to the accompanying drawings. Furthermore, in all the drawings referred to for the purpose of explaining the first, second, third, and fourth embodiments, the same reference numerals are used for the same or substantially the same structures or elements, and repeated descriptions are omitted. In the following description, unless otherwise specified, the terms "first," "second," etc., are used only to distinguish the constituent elements from each other and do not indicate a specific order or sequence.

[0047] [First Method]

[0048] The first embodiment will be described in detail with reference to the accompanying drawings.

[0049] [Battery pack structure]

[0050] Figure 1 This is a perspective view showing the appearance of the battery pack 10 according to the first embodiment. Figure 2This is an exploded view showing the various structures of battery pack 10. Battery pack 10 is equipped with a BMS (Battery Management System) 12. Figure 15 BMS12 controls the battery module 16 (described later). Figure 9 ( ) charging and discharging.

[0051] like Figure 2 As shown, the battery pack 10, as an example, has two groups of cells 18, a housing portion 22, two groups of busbar portions 76, two terminals 84, and two cell holders 102. Furthermore, one group of cells 18 and one cell holder 102 are collectively referred to as one battery module 16. Figure 9 Unit group 18 has battery columns S1, S2, S3, S4, S5, S6, and S7, described later. Figure 3 ).

[0052] In battery pack 10, for example, two battery modules 16 are arranged in the X direction. The structure formed by connecting the two battery modules 16 using two sets of busbars 76 and two terminals 84 is called module assembly 14. Figure 7 Additionally, in Figure 2 , omit BMS12( Figure 15 The illustration is shown.

[0053] <Battery Pack>

[0054] like Figure 3 As shown, two groups of cells 18 are arranged in the X direction (described later). Cell group 18 has battery columns S1, S2, S3, S4, S5, S6, and S7. Battery columns S1, S2, S3, S4, S5, S6, and S7 are examples of multiple battery packs, arranged at intervals in the Y direction (described later). As an example, each battery column S1, S2, S3, S4, S5, S6, and S7 has six battery cells S arranged in the X direction.

[0055] like Figure 2 As shown, the battery cell S is formed into a cylindrical shape and has a central axis C. In this first embodiment, the direction in which the central axis C of the battery cell S extends is defined as the Z direction. The Z direction is an example of the axial direction of the battery cell S. Terminal portions T1 and T2 with different shapes and polarities (positive and negative) are formed at one end and the other end of the battery cell S in the Z direction. Figure 3 Furthermore, terminal T1 is positive, and terminal T2 is negative. As an example, battery cell S is a lithium-ion battery. In a lithium-ion battery, voltage is generated through a chemical reaction, thereby allowing current to flow. However, battery cell S is not limited to lithium-ion batteries. Another example is a nickel-metal hydride battery.

[0056] In this first embodiment, as an example of the configuration of the battery cell S, the Z direction is along the vertical direction. Furthermore, in the battery arrays S1, S2, S3, S4, S5, S6, and S7 (… Figure 3 In each of the six battery cells S, the direction in which they are arranged is defined as the X direction. The X direction is an example of a first direction that intersects the axial direction. Furthermore, the direction that intersects both the Z direction and the X direction is defined as the Y direction. The Y direction is an example of a second direction. The X direction, Y direction, and Z direction are orthogonal to each other.

[0057] When distinguishing between one side and the other side in the Z direction, one side is designated as the top and the other side as the bottom. When distinguishing between one side and the other side in the X direction, one side is designated as the front and the other side as the back. When distinguishing between one side and the other side in the Y direction, one side is designated as the right and the other side as the left. In each diagram, the top of the arrows X, Y, and Z indicates one side, and the base indicates the other side.

[0058] like Figure 3 As shown, in unit group 18, for example, a total of 42 battery units S are used, six in the X direction and seven in the Y direction. In other words, in unit group 18, battery columns S1, S2, S3, S4, S5, S6, and S7, each with six battery units S, are arranged in the Y direction. Additionally, battery module 16 uses a total of 84 battery units S.

[0059] In each of battery columns S1, S2, S3, S4, S5, S6, and S7, six battery cells S are arranged in the X direction, with the polarity of terminal T1 or terminal T2 of battery cell S being the same. Furthermore, in battery columns S1, S2, S3, S4, S5, S6, and S7, the polarity of terminal T1 and terminal T2 alternate in the Y direction. Additionally, in battery columns S1, S2, S3, S4, S5, S6, and S7, seven battery cells S are arranged in a straight line in the Y direction. Furthermore, in cell group 18, for each of battery columns S1, S2, S3, S4, S5, S6, and S7, the six battery cells S are arranged in a zigzag configuration. That is, six battery cells S are arranged such that all adjacent battery cells S are staggered in the Y direction.

[0060] <Shell Section>

[0061] like Figure 2 As shown, the housing portion 22 is divided into upper and lower sections, having a lower housing 24 and an upper housing 62. The lower housing 24 is provided with a lower guide member 52. The upper housing 62 is provided with an upper guide member 72. The housing portion 22 houses battery arrays S1, S2, S3, S4, S5, S6, and S7. Figure 3The housing 22 includes two unit holders 102, two sets of busbar sections 76, and two terminals 84, described later. Furthermore, the housing 22 includes front walls 32 and 64 and rear walls 36 and 65, described later. Insert plugs or connectors (not shown) can be replaced on the housing 22.

[0062] The lower guide member 52 and the upper guide member 72 are collectively referred to as the guide portion 51. In other words, the guide portion 51 has the lower guide member 52 and the upper guide member 72. The guide portion 51 is provided on the housing portion 22. The guide portion 51 is an example of a positioning portion that positions the two unit holders 102 in the X and Y directions. The upper guide member 72 and the lower guide member 52 are examples of wall members that stand upright in the Z direction inside the housing portion 22.

[0063] (Lower casing)

[0064] like Figure 4 As shown, the lower housing 24 has a bottom wall 25, a front wall 32, a rear wall 36, a right wall 38, and a left wall 42. The bottom wall 25 is a plate-like portion with a specified thickness in the Z direction, and is formed into a rectangle with a dimension in the X direction longer than that in the Y direction. Four flat portions 26 are provided on the upper surface 25A of the bottom wall 25.

[0065] Four flat portions 26 are located at intervals in the Y direction and extend in the X direction. Each of the four flat portions 26 has a plane 26A. The position of plane 26A in the Z direction is above the position of the upper surface 25A in the Z direction. An insertion portion 27 is provided at the center of the upper surface 25A in the Y direction. The insertion portion 27 is composed of two vertical walls 28 that stand upright from the upper surface 25A upwards. In addition, in Figure 4 The illustration of the front longitudinal wall 28 is omitted.

[0066] The front wall 32 stands upright from the front end of the bottom wall 25. The front wall 32 has a hole 33. The hole 33 extends through the front wall 32 in the X direction. In other words, the hole 33 is open in the X direction. The hole 33 is composed of a plurality of through holes divided by four dividing portions 34. Each dividing portion 34 has an annular portion 34A and four straight portions 34B extending radially from the annular portion 34A.

[0067] The rear wall 36 stands upright from the rear end of the bottom wall 25. The rear wall 36 has a hole 37. The hole 37 extends through the rear wall 36 in the X direction. In other words, the hole 37 is open in the X direction. Like the hole 33, the hole 37 is composed of multiple through holes divided by four dividing portions 34. The front wall 32 and the rear wall 36 are an example of a pair of sidewalls located at intervals in the X direction.

[0068] The right wall 38 stands upright from the right end of the bottom wall 25. An insertion portion 39 and a rib 41 are provided on the inner surface 38A of the right wall 38. The insertion portion 39 has two longitudinal walls 39A protruding to the left from the inner surface 38A. The rib 41 is formed as a column protruding to the left from the inner surface 38A and extending in the Z direction. The rib 41 is located at the center between the rear wall 36 and the insertion portion 39 in the X direction.

[0069] The left wall 42 stands upright from the left end of the bottom wall 25. An insertion portion 43 and a rib 44 are provided on the inner surface 42A of the left wall 42. The insertion portion 43 has two longitudinal walls 43A protruding to the right from the inner surface 42A. The rib 44 is formed as a column protruding to the right from the inner surface 42A and extending in the Z direction. The rib 44 is located at the center between the rear wall 36 and the insertion portion 43 in the X direction. Furthermore, the insertion portions 27, 39, and 43 are in the same position in the X direction. No holes are formed on the right wall 38 and the left wall 42.

[0070] The upper ends of each of the front wall 32, rear wall 36, right wall 38, and left wall 42 are aligned. In other words, an upper end face 45 is formed on the lower housing 24. The upper end face 45 constitutes the dividing surface of the housing portion 22. Two claw portions 46 protruding upwards from the upper end face 45 and two recessed portions 47 recessed downwards from the upper end face 45 are formed at the corners of the lower housing 24. In addition, the space between the front wall 32 and the lower guide member 52 described later is used as a receiving portion 29.

[0071] (Lower guide component)

[0072] like Figure 4 As shown, the lower guide member 52 is a plate-shaped member with a predetermined thickness in the X direction. The lower guide member 52 is formed into a rectangle with its dimension in the Y direction being longer than its dimension in the Z direction. Two vent holes 53 are formed on the lower guide member 52. The two vent holes 53 penetrate the lower guide member 52 in the X direction. The vent holes 53 are formed into rectangles with their dimensions in the Y direction being longer than their dimensions in the Z direction. Protrusions 54 are provided on the periphery 52A of the two vent holes 53 in the lower guide member 52.

[0073] The protrusion 54 is capable of communicating with the incision 114 described later. Figure 7The contact area. As an example, the protrusion 54 has a first protrusion 55, a second protrusion 56, a third protrusion 57, and a fourth protrusion 58. The first protrusion 55, the second protrusion 56, the third protrusion 57, and the fourth protrusion 58 are formed as plates with a predetermined thickness in the Y direction. The first protrusion 55, the second protrusion 56, the third protrusion 57, and the fourth protrusion 58 are located sequentially from left to right in the Y direction, with one each on the upper and lower sides. The first protrusion 55 and the third protrusion 57 protrude rearward from the peripheral portion 52A. The second protrusion 56 and the fourth protrusion 58 protrude forward from the peripheral portion 52A.

[0074] The lower guide component 52 is fixed to the lower housing 24 via the lower end insertion part 27, the right end insertion part 39, and the left end insertion part 43. (BMS12) Figure 15 It is installed on the bottom wall 25 of the containment section 29.

[0075] (Upper shell)

[0076] like Figure 5 As shown, a portion of the upper housing 62 has a connection with the lower housing 24. Figure 4 The same parts. Therefore, for structures identical to the lower housing 24, the same reference numerals are used and descriptions are omitted. Furthermore, the structures of each of the lower housing 24 and the upper housing 62 can be either the same or different structures.

[0077] The upper housing 62 has an upper wall 63, a front wall 64, a rear wall 65, a right wall 66, and a left wall 67. The upper wall 63 is a plate-like portion with a predetermined thickness in the Z direction, and is formed into a rectangle with its X-direction dimension longer than its Y-direction dimension. Four flat portions 26 are provided on the lower surface 63A of the upper wall 63. An insertion portion 27 is provided at the center of the lower surface 63A in the Y direction.

[0078] The front wall 64 extends downward from the front end of the upper wall 63. The front wall 64 has a hole 33. The rear wall 65 extends downward from the rear end of the upper wall 63. The rear wall 65 has a hole 37. The front wall 64 and the rear wall 65 are an example of a pair of sidewalls located at a distance from each other in the X direction. The right wall 66 extends downward from the right end of the upper wall 63. An insertion portion 39 and a rib 41 are provided on the inner surface 66A of the right wall 66. The left wall 67 extends downward from the left end of the upper wall 63. An insertion portion 43 and a rib 44 are provided on the inner surface 67A of the left wall 67. No holes are formed on the right wall 66 and the left wall 67.

[0079] The lower ends of each of the front wall 64, rear wall 65, right wall 66, and left wall 67 are aligned. In other words, a lower end face 68 is formed on the upper shell 62. The lower end face 68 constitutes the dividing surface of the shell portion 22. Two claw portions 46 protruding downwards from the lower end face 68 and two recessed portions 47 recessed upwards from the lower end face 68 are formed at the corners of the upper shell 62. Upper shell 62 and lower shell 24 ( Figure 4 The shell part 22 is formed by the interlocking of the claw part 46 and the recessed part 47 arranged vertically.

[0080] (Upper guide component)

[0081] like Figure 5 As shown, the upper guide member 72 has a connection with the lower guide member 52 ( Figure 4 The same location. Therefore, for structures identical to the lower guide member 52, the same reference numerals are used and descriptions are omitted.

[0082] The upper guide member 72 is a component that allows the lower guide member 52 to rotate 180° about an axis along the X direction, and has the same structure as the lower guide member 52. Therefore, the first protrusion 55, the second protrusion 56, the third protrusion 57, and the fourth protrusion 58 are positioned sequentially from right to left in the Y direction. The upper guide member 72 is fixed to the upper housing 62 by inserting the upper end into the insertion part 27, the right end into the insertion part 39, and the left end into the insertion part 43.

[0083] <Confluence Section>

[0084] like Figure 2 As shown, the busbar sections 76 are respectively provided on the upper side (one end side) and the lower side (the other end side) relative to the two battery modules 16. The upper busbar section 76 and the lower busbar section 76 are arranged to overlap each other when rotated 180° about an imaginary axis (not shown) along the X direction.

[0085] The busbar section 76 is made of metal and is capable of conducting electricity. It extends along the X direction and contacts multiple battery cells S in the Z direction. The upper busbar section 76 is welded to the terminal sections T1 and T2 located on the upper side of the multiple battery cells S. Figure 3 The lower busbar portion 76, like the upper busbar portion 76, is connected to the terminal portions T1 and T2 located on the lower side of the plurality of battery cells S by welding. The upper and lower busbar portions 76 are examples of conductive portions, electrically connecting adjacent terminal portions T1 and T2 in the Y direction and extending in the X direction.

[0086] The upper busbar portion 76 and the lower busbar portion 76 each have three busbars 78. The three busbars 78 are located at intervals in the Y direction and extend in the X direction. The three upper busbars 78 are an example of a first conductive member. The three lower busbars 78 are an example of a second conductive member.

[0087] like Figure 6 As shown, the busbar 78 is formed as a plate with a predetermined thickness in the Z direction. As an example, the busbar 78 has a main body 79, eight contact portions 81, and four contact portions 82. The main body 79 is formed as a rectangle with a dimension in the X direction longer than its dimension in the Y direction. The area of ​​the contact portions 81 is larger than the area of ​​the contact portions 82. Four contact portions 81 and two contact portions 82 on one side protrude to the right from the main body 79. Four contact portions 81 and two contact portions 82 on the other side protrude to the left from the main body 79. The eight contact portions 81 and four contact portions 82 are arranged in a serrated pattern, facing the X direction and staggered in the Y direction.

[0088] <Terminal>

[0089] like Figure 2 As shown, terminals 84 are disposed on the upper and lower sides relative to the two battery modules 16. The upper terminal 84 and the lower terminal 84 are arranged to overlap each other when rotated 180° about an axis along the X direction.

[0090] Figure 6 The upper terminal 84 is shown. Terminal 84 is made of metal, capable of conducting electricity, and extends along the X direction. Furthermore, terminal 84 is an L-shaped component in the YZ plane. Terminal 84 has a main body 86, four contact portions 92, and two contact portions 94. The main body 86 has a longitudinal plate 87 along the XZ plane and a transverse plate 88 extending to the left from the upper end of the longitudinal plate 87. A through hole 89 for fastening is formed in the longitudinal plate 87. The four contact portions 92 and two contact portions 94 protrude to the left from the transverse plate 88.

[0091] like Figure 2 As shown, the upper and lower terminals 84 are in contact with the plurality of battery cells S in the Z direction. The upper terminal 84 is located on the right side in the Y direction, spaced apart from the right-side busbar 78. Furthermore, the upper terminal 84 is soldered to the upper terminal portion T2 of the plurality of battery cells S. Figure 3 The lower terminal 84 is located on the left side in the Y direction, spaced apart from the left-side busbar 78. Furthermore, the lower terminal 84 is soldered to the lower terminal portion T1 of the plurality of battery cells S. Figure 3 )connect.

[0092] Figure 7The module assembly 14 is shown. As an example, the module assembly 14 has two battery modules 16, two sets of busbars 76 extending across the two battery modules 16 in the X direction, and two terminals 84. In other words, battery modules 16 are added in the X direction by using the two sets of busbars 76 extending in the X direction and the two terminals 84.

[0093] like Figure 8 As shown, the three upper busbars 78 and the three lower busbars 78 are positioned in the Y direction only offset from one of the battery columns S1, S2, S3, S4, S5, S6, and S7. The three upper busbars 78 extend from left to right in the Y direction and electrically connect the terminals T2 and T1 of battery column S1, the terminals T2 and T1 of battery column S3 and S4, and the terminals T2 and T1 of battery column S5 and S6.

[0094] On the other hand, the three busbars 78 on the lower side move from the left to the right in the Y direction and electrically connect the terminal T2 of battery column S2 and the terminal T1 of battery column S3, the terminal T2 of battery column S4 and the terminal T1 of battery column S5, and the terminal T2 of battery column S6 and the terminal T1 of battery column S7.

[0095] like Figure 7 As shown, as an example, module assembly 14 has two unit holders 102 arranged in the X direction. The two unit holders 102 are in contact in the X direction. Hereinafter, the configuration of each structure of the unit holders 102 will be described with reference to the configuration of the battery module 16 in its completed state.

[0096] <Unit Holder>

[0097] like Figure 9 As shown, the cell holder 102 holds the battery arrays S1, S2, S3, S4, S5, S6, and S7. Specifically, the cell holder 102 includes a holding portion 104 and an opening portion 105.

[0098] (Maintenance Department)

[0099] The retaining part 104 keeps the battery rows S1, S2, S3, S4, S5, S6, and S7 spaced apart by a distance Y1 in the Y direction. Figure 16 The battery columns S1, S2, S3, S4, S5, S6, and S7 are maintained in a zigzag configuration. Additionally, the holding unit 104 (unit holder 102) maintains the battery columns S1, S2, S3, S4, S5, S6, and S7 in a zigzag configuration.

[0100] The holding part 104 has a first component 106 and a second component 126. The second component 126 is located below the first component 106. The first component 106 holds one end (upper end) of the battery array S1, S2, S3, S4, S5, S6, and S7 in the Z direction. The second component 126 holds the other end (lower end) of the battery array S1, S2, S3, S4, S5, S6, and S7 in the Z direction. In this way, by holding the two ends of the multiple battery cells S in the axial direction, the first component 106 and the second component 126 align the multiple battery cells S in the X and Y directions.

[0101] <First Component>

[0102] like Figure 10 As shown, as an example, the first component 106 has a first frame portion 108 and six first wall portions 116. Additionally, the first component 106 is provided with six cutouts 114 and three grooves 124. Furthermore, in... Figure 10 In order to clearly show the various parts of the first component 106, only the battery cells S in the two columns on the right are represented by imaginary lines, and the remaining battery cells S are omitted from the diagram.

[0103] The first frame portion 108 has a generally rectangular shape, with its dimension in the Y direction being longer than its dimension in the X direction. The first frame portion 108 surrounds and supports six first wall portions 116 in both the X and Y directions. Specifically, the first frame portion 108 has a front wall 109, a rear wall 111, a right wall 112, and a left wall 113. The first frame portion 108, together with the six first wall portions 116, holds a plurality of battery cells S.

[0104] The front wall 109 and rear wall 111 are upright in the Z direction and extend in the Y direction. The right wall 112 and left wall 113 are upright in the Z direction and extend in the X direction. Furthermore, the upper end face of the first frame portion 108 in the Z direction is designated as the first surface 108A. Figure 9 The lower end face is designated as the second face 108B. Three cutouts 114 are provided on the front wall 109 and the rear wall 111, respectively.

[0105] The cut portion 114 is a portion that is recessed in the X direction from the front end face 109A of the front wall 109 or the rear end face 111A of the rear wall 111. The cut portion 114 is U-shaped when viewed from the Z direction. As an example, the cut portion 114 and the end portion of the first wall portion 116 in the X direction are aligned in the X direction.

[0106] The first wall portion 116 extends from the rear wall 111 to the front wall 109 on the inner side of the first frame portion 108, bending towards both sides (right and left) in the Y direction while extending along the X direction. Two adjacent first wall portions 116 in the Y direction hold six battery cells S by clamping them in both the X and Y directions. The other four groups of first wall portions 116 are similar. Furthermore, the first frame portion 108 and the first wall portion 116 hold the remaining two rows (six cells per row) of battery cells S by clamping them in both the X and Y directions.

[0107] Each group's first wall portion 116 holds one end (upper end) of the six battery cells S in the Z direction. Specifically, the first wall portion 116 holds multiple battery cells S such that the multiple battery cells S are densely arranged in the X direction and spaced apart in the Y direction. The first wall portion 116 functions as a partition that divides the configuration areas of the multiple battery cells S at multiple points in the Y direction.

[0108] Viewed from the Z direction, the first wall portion 116 has a shape in which a mountain portion 117 protruding to the right and a valley portion 118 opening to the right are alternately arranged in the X direction. The mountain portion 117 is a portion with a generally isosceles trapezoidal shape without a lower base, opening to the left. In the mountain portion 117, the upper base 117A, corresponding to the upper base of the trapezoid, has a generally equal thickness and is curved. The portions in the mountain portion 117 corresponding to the two hypotenuses of the trapezoid are designated as hypotenuse portions 117B. The thickness of the hypotenuse portion 117B at its center in the Y direction is thinner than the thickness of its two ends. A curved surface 117C is formed on the hypotenuse portion 117B so that it can make close contact with the outer peripheral surface of the battery cell S.

[0109] Valley 118 is a roughly isosceles trapezoidal section without a lower base, opening to the right. The upper base 118A of valley 118, corresponding to the upper base of the trapezoid, has a roughly uniform thickness and is curved. The section of valley 118 corresponding to the two hypotenuses of the trapezoid is the hypotenuse 117B. That is, hypotenuse 117B is a section shared by both mountain 117 and valley 118.

[0110] like Figure 11 As shown, the six first wall portions 116 are respectively oriented towards the second wall portion 136 described later. Figure 12 On the opposite side (upper side), it is more recessed than the second surface 108B. Thus, a stepped portion 119 is formed at the connection between the first frame portion 108 and the first wall portion 116.

[0111] like Figure 7As shown, as an example, the first component 106 is provided with three grooves 124. Specifically, the first component 106 is provided with edges 122A, 122B, 122C, and 122D that protrude upward from the first surface 108A. The edges 122A, 122B, 122C, and 122D are located at intervals in the Y direction and have a generally triangular wavy shape that travels in the X direction.

[0112] The spaces between edge portions 122A and 122B, edge portions 122B and 122C, and edge portions 122C and 122D respectively correspond to groove portions 124. In other words, the groove portion 124 bends on both sides in the Y direction and extends in the X direction. The busbar 78 can be embedded in the groove portion 124. Because the groove portion 124 has a shape that bends on both sides in the Y direction, the groove portion 124 and the busbar 78 can contact each other in the X and Y directions. In other words, the groove portion 124 can restrict the movement of the busbar 78 in the X and Y directions.

[0113] <Second Component>

[0114] like Figure 12 As shown, as an example, the second component 126 has a second frame portion 128 and six second wall portions 136. Furthermore, the second component 126 is provided with six cutouts 134 and three grooves 144. Additionally, in... Figure 12 In order to clearly show the various parts of the second component 126, only the battery cells S in the two columns on the left are represented by imaginary lines, and the remaining battery cells S are omitted from the diagram.

[0115] The second frame portion 128 has a generally rectangular shape, with its Y-direction dimension longer than its X-direction dimension. The dimensions of the second frame portion 128 in the X and Y directions are similar to those of the first frame portion 108. Figure 10 The second frame portion 128 surrounds and supports six second wall portions 136 in the X and Y directions. Specifically, the second frame portion 128 has a front wall 129, a rear wall 131, a right wall 132, and a left wall 133. The second frame portion 128, together with the six second wall portions 136, holds a plurality of battery cells S.

[0116] The front wall 129 and the rear wall 131 are upright in the Z direction and extend in the Y direction. The right wall 132 and the left wall 133 are upright in the Z direction and extend in the X direction. Furthermore, the upper end face of the second frame portion 128 in the Z direction is designated as the first end face 128A, and the lower end face is designated as the second end face 128B. Figure 13 Three cutouts 134 are provided on the front wall 129 and the rear wall 131 respectively.

[0117] The cut portion 134 is a portion that is recessed in the X direction from the front end face 129A of the front wall 129 or the rear end face 131A of the rear wall 131. The cut portion 134 is U-shaped when viewed from the Z direction. As an example, the cut portion 134 and the X-direction ends of the second wall portion 136 are arranged in the X direction.

[0118] The second wall portion 136 extends from the rear wall 131 to the front wall 129 on the inner side of the second frame portion 128, bending to both sides in the Y direction while extending along the X direction. Two adjacent sets of second wall portions 136 in the Y direction hold six battery cells S by clamping them in the X and Y directions. The other four sets of second wall portions 136 are similar. Furthermore, the second frame portion 128 and the second wall portion 136 hold the remaining two rows (six cells per row) of battery cells S by clamping them in the X and Y directions.

[0119] The second wall portion 136 of each group holds the other end (lower end) of the six battery cells S in the Z direction. Specifically, the second wall portion 136 holds multiple battery cells S such that the multiple battery cells S are densely arranged in the X direction and spaced apart in the Y direction. The second wall portion 136 functions as a partition that divides the configuration areas of the multiple battery cells S at multiple points in the Y direction.

[0120] Viewed from the Z direction, the second wall portion 136 has a shape in which a mountain portion 137 protruding to the right and a valley portion 138 opening to the right are alternately arranged in the X direction. The mountain portion 137 is a portion with a generally isosceles trapezoidal shape without a lower base, opening to the left. In the mountain portion 137, the upper base 137A, corresponding to the upper base of the trapezoid, has a generally equal thickness and is curved. The portions in the mountain portion 137 corresponding to the two hypotenuses of the trapezoid are designated as hypotenuse portions 137B. The thickness of the hypotenuse portion 137B at its central portion in the Y direction is thinner than the thickness of its two ends. A curved surface 137C is formed on the hypotenuse portion 137B so that it can make close contact with the outer peripheral surface of the battery cell S.

[0121] Valley 138 is a roughly isosceles trapezoidal section without a lower base, opening to the right. The upper base 138A of valley 138, corresponding to the upper base of the trapezoid, has a roughly uniform thickness and is curved. The section of valley 138 corresponding to the two hypotenuses of the trapezoid is the hypotenuse 137B. That is, hypotenuse 137B is a section shared by valley 138 and mountain 137.

[0122] like Figure 13 As shown, a portion (upper part) of each of the six second wall portions 136 faces the first wall portion 116. Figure 11Furthermore, it protrudes further than the first surface 128A. Consequently, a stepped portion 139 is formed at the connection between the second frame portion 128 and the second wall portion 136. In addition, the first wall portion 116 and the second wall portion 136 are arranged in the Z direction with their positions aligned in the X and Y directions.

[0123] like Figure 12 and Figure 13 As shown, as an example, the second component 126 is provided with three grooves 144. Specifically, the second component 126 is provided with edges 142A, 142B, 142C, and 142D protruding downward from the second surface 128B. The edges 142A, 142B, 142C, and 142D are located at intervals in the Y direction and have a generally triangular wavy shape that travels in the X direction.

[0124] The spaces between edge portions 142A and 142B, between edge portions 142B and 142C, and between edge portions 142C and 142D respectively correspond to groove portions 144. In other words, the groove portion 144 bends on one side in the Y direction and extends in the X direction. A busbar 78 can be embedded in the groove portion 144. Figure 6 The groove 144 has a shape that bends to both sides in the Y direction, allowing it to contact the busbar 78 in both the X and Y directions. In other words, the groove 144 can restrict the movement of the busbar 78 in both the X and Y directions. Thus, in the unit holder 102 ( Figure 9 The groove 124 is provided on it. Figure 9 ), groove 144.

[0125] (Open Department)

[0126] like Figure 9 As shown, the opening 105 is a portion that allows gas to enter and exit between the battery arrays S1, S2, S3, S4, S5, S6, and S7 held in the holding portion 104. As an example, the opening 105 is composed of a second surface 108B of a first component 106 and a first surface 128A of a second component 126. The second surface 108B and the first surface 128A are located at a distance d1 (mm) apart in the Z direction.

[0127] The size of the interval d1 is set such that the portion of the outer peripheral surface of the plurality of battery cells S, excluding the upper and lower ends of the terminal portions T1 and T2, is exposed. Thus, in the battery module 16, for example, the first component 106 and the second component 126 are positioned at a distance from each other in the Z direction, functioning as an open portion 105.

[0128] like Figure 16As shown, in the battery module 16, the central portion of the battery cell S in the Z direction is exposed to the outside of the battery module 16 through the opening 105. Furthermore, in the battery module 16, the upper portions of the plurality of battery cells S are held by the first wall portion 116. The lower portions of the plurality of battery cells S are held by the second wall portion 136. Here, the surface located at the lower end of the first wall portion 116 in the Z direction is designated as the first end surface 116A. In addition, the surface located at the upper end of the second wall portion 136 in the Z direction is designated as the second end surface 136A.

[0129] The first end face 116A and the second end face 136A are located at a distance d2 (mm) apart in the Z direction. That is, the first wall portion 116 and the second wall portion 136 are located at a distance d2 apart in the Z direction. Thus, a flow path K for gas (for example, air) is formed between adjacent battery cells S in the Y direction. Furthermore, in Figure 16 In this example, the size of interval d1 is the same as that of interval d2, but interval d1 and interval d2 can also be equal, or either one can be larger.

[0130] <Battery Pack Assembly>

[0131] like Figure 14A As shown, the upper housing 62 is placed on a worktable (not shown) in an upside-down tilted state. Two first components 106 are placed on the flat portion 26 of the upper housing 62 with the grooves 124 facing downwards. Additionally, in Figure 14A The diagram shows the rear first component 106, while the front first component 106 is omitted. Within the first component 106, a first protrusion 55 and a third protrusion 57 (…) Figure 4 ) respectively inserted into the incision 114 ( Figure 7 In this context, it is positioned relative to the upper housing 62.

[0132] like Figure 14B As shown, multiple battery cells S are disposed on the first component 106. At this time, the multiple battery cells S are connected by multiple first wall portions 116 (…). Figure 11 The lower part remains upright in the Z direction. Thus, multiple battery cells S are upright in the Z direction via the first component 106 and aligned in the X and Y directions. In other words, battery arrays S1, S2, S3, S4, S5, S6, and S7 ( Figure 3 It is located at a distance Y1 in the Y direction. When the battery cells S are arranged in the entirety of the two first components 106, the total number of battery cells S is 7×6×2=84.

[0133] like Figure 14C As shown, the second component 126 is mounted from above relative to the upper part of the plurality of battery cells S, thereby forming a battery module 16. Figure 9 At this time, the upper parts of the multiple battery cells S are guided between the multiple second wall portions 136 by contacting a portion (lower part) of the downwardly protruding second wall portion 136. Thus, the installation of the second component 126 onto the multiple battery cells S can be performed easily.

[0134] like Figure 14D As shown, three busbars 78 and terminals 84 are mounted on the second component 126. At this time, the busbars 78 are embedded in the slots 144 and contact one end of the plurality of battery cells S. The terminals 84 are supported by the second component 126 and contact one end of the plurality of battery cells S. Then, the three busbars 78 and terminals 84 are soldered to one end of the plurality of battery cells S.

[0135] Furthermore, the second component 126 passes through the lower housing 24 ( Figure 4 The second component 126 covers from the top and contacts the lower housing 24. At this time, the second component 126 passes through the first protrusion 55 and the third protrusion 57 ( Figure 4 ) respectively inserted into the incision 134 ( Figure 12 In this configuration, the upper housing 62 is positioned relative to the lower housing 24. After the second component 126 is housed in the lower housing 24, the entire assembly is flipped upside down with the lower housing 24 on the lower side and the upper housing 62 on the upper side. Then, the upper housing 62 is removed.

[0136] like Figure 14E As shown, three busbars 78 and terminals 84 are mounted on the first component 106. At this time, the busbars 78 are embedded in the slots 124 and contact the other ends of the plurality of battery cells S. The terminals 84 are supported by the first component 106 and contact the other ends of the plurality of battery cells S. Then, the three busbars 78 and terminals 84 are soldered to the other ends of the plurality of battery cells S.

[0137] like Figure 15 As shown, after multiple battery cells S are welded, BMS12 and wiring are installed in the receiving part 29 between the front wall 32 and the guide part 51.

[0138] like Figure 2 As shown, the first component 106 is covered from above by the upper housing 62 and contacts the upper housing 62. At this time, the first component 106 inserts the first protrusion 55 and the third protrusion 57 into the cutout 114 respectively. Figure 15 In this state, it is positioned relative to the upper housing 62. This is achieved by the claw 46 and the recess 47. Figure 4 , Figure 5 The upper housing 62 and the lower housing 24 are engaged, forming a single unit, thereby creating the battery pack 10.

[0139] [The function of the battery pack]

[0140] like Figure 17 As shown, in battery module 16, the dense arrangement of multiple battery cells S in the X direction makes it difficult for air AF to flow in the Y direction. On the other hand, the multiple flow paths K extend along the X direction while meandering on both sides of the Y direction, making it easy for air AF to flow in the X direction around the multiple battery cells S. Therefore, the performance of battery module 16 can be improved. Figure 9 The configuration density of multiple battery cells S in the battery cell S is increased, and heat dissipation of multiple battery cells S is promoted.

[0141] Figure 18 The diagram schematically illustrates the state in which air AF flows into the interior of the housing portion 22 from the hole 37 in the rear wall 36 and out from the hole 33 in the front wall 32. The air AF flowing into the housing portion 22 can cool the multiple battery cells S of the two cell groups 18 by flowing through multiple flow paths K. The air AF flowing inside the two cell groups 18 (flow path K) flows outward from the hole 33 in the front wall 32 through the vent 53.

[0142] Furthermore, no holes are formed on the right walls 38 and 66 and the left walls 42 and 67 in the housing portion 22. Therefore, air AF flowing into the interior of the housing portion 22 from the holes 37 is prevented from immediately flowing outwards from the right walls 38 and 66 and the left walls 42 and 67. The flow of air AF can be either forced flow or natural flow. That is, the flow of air AF can be a forced flow generated by using an air supply unit such as a fan, or it can be a natural flow generated by a temperature difference.

[0143] The functions of the battery pack 10, battery module 16, and cell holder 102 according to the first embodiment will be summarized below. Additionally, refer to... Figures 1 to 18 Some drawing numbers are omitted.

[0144] When the cell holder 102 holds the battery arrays S1, S2, S3, S4, S5, S6, and S7, the battery arrays S1, S2, S3, S4, S5, S6, and S7 are arranged at a distance Y1 in the Y direction. Therefore, a flow path K extending in the X direction is formed between the battery arrays S1, S2, S3, S4, S5, S6, and S7. By allowing gases such as air AF to flow in the flow path K, heat dissipation from the multiple battery cells S can be promoted.

[0145] In the cell holder 102 (battery pack 10), the holding part 104 holds six battery cells S arranged in a zigzag pattern, namely S1, S2, S3, S4, S5, S6, and S7. This forms a flow path K that curves along both sides (right and left) in the Y direction and extends along the X direction, increasing the contact area between the gas and the multiple battery cells S compared to a straight flow path K. Furthermore, because the flow path K is tortuous, gas turbulence is easily generated within it, further promoting heat dissipation from the multiple battery cells S.

[0146] Furthermore, the first wall portion 116 and the second wall portion 136 bend on both sides in the Y direction and extend in the X direction. This allows multiple flow paths K to be formed between the multiple battery cells S, and enables the multiple battery cells S to be densely arranged in the X direction. Here, the gas flow direction is the X direction. Therefore, even if multiple cell holders 102 are arranged in the X direction, the flow paths K can be ensured. That is, the X-direction expandability of the cell holders 102 can be ensured, and heat dissipation of the multiple battery cells S is promoted.

[0147] In the cell holder 102, the first component 106 and the second component 126 function as an opening 105 by being located at a distance d1 in the Z direction. Therefore, a portion of the outermost battery cells S in the two cell groups 18 is exposed. This allows gas to enter and exit between the battery rows S1, S2, S3, S4, S5, S6, and S7 held in the holder 104, and promotes heat dissipation from the outermost battery cells S in both the X and Y directions.

[0148] In the cell holder 102, a portion of the second wall 136 of the second component 126 faces the first wall 116 and protrudes further than the first surface 128A. Here, when the second component 126 is mounted on the upper part of the plurality of battery cells S, the upper parts of the plurality of battery cells S are guided between the plurality of second walls 136 by contacting the protruding portion of the second wall 136. Thus, it is easy to mount the second component 126 to the plurality of battery cells S, and therefore it is easy to mount the cell holder 102 to the plurality of battery cells S.

[0149] In the cell holder 102, the first wall portion 116 of the first component 106 faces the side opposite to the second wall portion 136 and is more recessed than the second surface 108B. Here, when the cell holder 102 holds multiple battery cells S, the multiple battery cells S are placed on the lower side by placing the first component 106, and the multiple battery cells S are held between the multiple first walls 116 by gravity. In this way, even if the first walls 116 are recessed, multiple battery cells S can be held, thus making the cell holder 102 lightweight.

[0150] In battery module 16, with the polarities of terminals T1, T2 of battery rows on one side of the adjacent battery row in the Y direction being different from the polarities of terminals T1, T2 of battery rows on the other side, terminals T1, T2 of all battery cells S are arranged in the X direction. Therefore, by using multiple busbars 78 that have a width that can connect to terminals T1, T2 of adjacent battery rows and extend in the X direction, all battery cells S can be connected in series and in parallel. To increase the number of parallel connections, identical battery modules 16 can be arranged in the X direction, and each busbar 78 can be extended in the X direction for electrical connection, thereby making it easy to add battery modules 16.

[0151] As a specific example, 42 battery cells S connected in parallel × 7 in series can be considered as one unit, and n battery modules 16 (n being a natural number) can be arranged in the X direction. That is, as a configuration of multiple battery cells S, a configuration of 7 series and 6n parallel (for example, 7 series × 12 parallel) is possible. Furthermore, by extending the busbar 76 in the X direction, the n battery modules 16 can be connected through a shared busbar 76. In this way, a battery pack 10 having n battery modules 16 can be easily manufactured.

[0152] In the battery pack 10, in addition to the functions of the cell holder 102 described above, the housing portion 22 prevents air such as air AF that flows into the housing portion 22 from the hole 37 from immediately flowing to the outside of the housing portion 22, but instead allows it to flow to the outside from the hole 33. This promotes heat dissipation from the multiple battery cells S in the battery pack 10.

[0153] In the battery pack 10, multiple battery cells S are arranged in each of the battery columns S1, S2, S3, S4, S5, S6, and S7 with the same polarity at terminals T1 and T2. Furthermore, the polarities of terminals T1 and T2 in the battery columns S1, S2, S3, S4, S5, S6, and S7 alternate in the Y direction. Additionally, a busbar 76 electrically connects multiple adjacent terminals T1 and T2 in the Y direction and extends in the X direction. This allows for the electrical connection of multiple battery cells S connected in series in the Y direction and in parallel in the X direction, and reduces the number of busbars 78 required to connect the multiple battery cells S.

[0154] In the battery pack 10, for example, two battery modules 16 are arranged in the X direction. The busbar section 76 has three busbars 78 on the upper and lower sides respectively. The upper busbar 78 electrically connects multiple terminal portions T1, T2 located on the upper side. The lower busbar 78 electrically connects multiple terminal portions T1, T2 located on the lower side. Furthermore, the upper busbar 78 and the lower busbar 78 are located in a staggered column in the Y direction, opposite to the battery rows.

[0155] Here, the polarities of terminals T1 and T2 in each of battery arrays S1, S2, S3, S4, S5, S6, and S7 are consistent in the X direction. Furthermore, the polarities of terminals T1 and T2 alternate in the Y direction. Therefore, by positioning the upper and lower busbars 78 in a staggered row in the Y direction, multiple battery cells S can be connected in series in the Y direction. Then, if the upper and lower busbars 78 are extended in the X direction, the number of series connections in the Y direction for multiple battery cells S remains fixed, while the number of parallel connections in the X direction can be increased. That is, battery modules 16 can be easily added in the X direction.

[0156] In the battery pack 10, by embedding the busbars 78 into the slots 124 and 144 respectively, the movement of each busbar 78 in the X and Y directions is restricted. Therefore, when the busbars 78 are welded to the multiple battery cells S, positional displacement of the busbars 78 can be suppressed.

[0157] In the battery pack 10, the guide portion 51 positions the cell holder 102 in the X and Y directions. Therefore, when assembling the battery pack 10, even if the housing portion 22 is flipped up and down, the positional displacement of the cell holder 102 in the X or Y direction can be suppressed.

[0158] In the battery pack 10, the cell holder 102 is positioned by engaging the protrusion 54 with the cutout 114. Here, vent holes 53 are provided on the upper guide member 72 and the lower guide member 52, on which the protrusion 54 is provided. Therefore, since the flow of gases such as air is restricted by the upper guide member 72 and the lower guide member 52, the cell holder 102 can be positioned, and the gas can flow further downstream than the upper guide member 72 and the lower guide member 52.

[0159] In the battery pack 10, the first component 106 and the second component 126 can be shared. That is, the retaining part 104 can also be formed by two identical components. In this case, since the components constituting the battery pack 10 are shared on both the upper and lower sides, the types (number) of components can be reduced. Specifically, each of the cell retainer 102, housing 22, busbar 78, and terminal 84 is shared by eliminating the distinction between upper and lower sides. In addition, by sharing the components, the appearance of the battery pack 10 remains the same even if the battery pack 10 is flipped.

[0160] [Second Method]

[0161] The battery pack 150 according to the second embodiment will be described in detail with reference to the accompanying drawings.

[0162] Figure 19This shows the components of the battery pack 150 according to the second method. Battery pack 150 and battery pack 10 ( Figure 18 The only difference between the two is the spacing described later. That is, apart from the different spacing of the components, the battery pack 150 has the same structure as the battery pack 10. Therefore, for the battery pack 150, the housing 22 and the battery module 16 will be described, and the description of other structures will be omitted.

[0163] The battery pack 150 includes a housing 22 and two battery modules 16. The housing 22 includes a bottom wall 25, front walls 32 and 64, a rear wall 36 and 65, a right wall 38 and 66, a left wall 42 and 67, and an upper wall 63. Figure 5 ).

[0164] Right walls 38 and 66 and left walls 42 and 67 are another pair of side walls located at a spaced interval in the Y direction. Right walls 38 and 66 and left walls 42 and 67 are located on the outer side (right and left side) of the two battery modules 16 in the Y direction. In addition, right walls 38 and 66 and left walls 42 and 67 are opposite to the two battery modules 16 in the Y direction.

[0165] The two ends located in the Y direction of the housing part 22 and formed by the bottom wall 25 and the upper wall 63 ( Figure 5 The portions formed by the front walls 32 and 64, and the rear walls 36 and 65 are designated as imaginary openings. Here, the right walls 38 and 66 and the left walls 42 and 67 cover the imaginary openings in the Y direction. In other words, the right walls 38 and 66 and the left walls 42 and 67 are closed, suppressing the outflow of air from the housing portion 22 to the outside in the Y direction.

[0166] like Figure 20 As shown, the two battery modules 16 each have battery columns S1, S2, S3, S4, S5, S6, S7 and a cell holder 102. The two battery modules 16 are arranged with a first gap L1 in the X direction.

[0167] In the front battery module 16 in the X direction, the common tangent line on the rear side of the plurality of battery cells S located at the rear end is designated as common tangent line E1. Common tangent line E1 is along the Y direction. In the rear battery module 16 in the X direction, the common tangent line on the front side of the plurality of battery cells S located at the front end is designated as common tangent line E2. Common tangent line E2 is along the Y direction. The first interval L1 is the distance between common tangent lines E1 and common tangent line E2 in the X direction. In other words, the first interval L1 is equivalent to the distance between the front battery module 16 and the rear battery module 16.

[0168] Battery rows S1, S2, S3, S4, S5, S6, and S7 are located at intervals along the Y direction. Taking battery rows S1 and S2 as examples, the smallest interval between the battery cells S in battery row S1 and battery cells S2 is defined as the second interval L2. The second interval L2 is the interval between battery cells S in directions intersecting both the X and Y directions when viewed from the Z direction. For example, the second interval L2 is narrower than the first interval L1.

[0169] [The function of the battery pack]

[0170] like Figure 20 As shown, in the battery pack 150, the second gap L2 between cells is narrower than the first gap L1 between modules. That is, because the second gap L2 is narrower than the first gap L1, air has difficulty passing through the flow path K between battery cells S.

[0171] On the other hand, air flows easily between the two battery modules 16 due to the large opening and low pressure. That is, air easily flows from between the two battery modules 16 in the Y direction. Here, right walls 38 and 66 and left walls 42 and 67 are provided on the outer side relative to the two battery modules 16 in the Y direction. Therefore, air flows from between the two battery modules 16 to the outer side in the Y direction, but the movement of air in the Y direction is restricted by the right walls 38 and 66 and the left walls 42 and 67. Therefore, air flows between the battery module 16 and the right walls 38 and 66, or between the battery module 16 and the left walls 42 and 67.

[0172] Thus, in the battery pack 150, because the second gap L2 is narrower than the first gap L1, air has difficulty flowing in the multiple flow paths K. However, by flowing between the battery module 16 and the right walls 38, 66 or between the battery module 16 and the left walls 42, 67, air can cool the two battery modules 16 from the outside. This promotes heat dissipation of the multiple battery cells S.

[0173] [Third Method]

[0174] The battery pack 160 according to the third embodiment will be described in detail with reference to the accompanying drawings.

[0175] like Figure 21 As shown, the battery pack 160 according to the third-party method and the battery pack 10 according to the first embodiment ( Figure 1 The difference lies in the setting of the intervals described later and the provision of multiple holes 164. That is, apart from the difference in the intervals of the components and the provision of multiple holes 164, the battery pack 160 has the same structure as the battery pack 10. Therefore, the housing portion 162 and the battery module 16 of the battery pack 160 will be compared. Figure 22 The explanation is provided below, while the explanation of other structures is omitted.

[0176] The battery pack 160 includes a housing 162 and two battery modules 16. Figure 22 The housing portion 162 includes a bottom wall 25, front walls 32 and 64, rear walls 36 and 65, right walls 38 and 66, left walls 42 and 67, and an upper wall 63.

[0177] Figure 22 The right walls 38 and 66 and the left walls 42 and 67 shown are another example of a pair of side walls. The right walls 38 and 66 and the left walls 42 and 67 are located on the outer side (right and left side) of the two battery modules 16 in the Y direction. Furthermore, the right walls 38 and 66 and the left walls 42 and 67 are opposite the two battery modules 16 in the Y direction. Moreover, the right walls 38 and 66 and the left walls 42 and 67 are provided with a plurality of holes 164. The plurality of holes 164 are an example of other types of holes.

[0178] Multiple holes 164 open toward the two battery modules 16. As an example, five holes 164 are provided on the right walls 38 and 66 respectively, and five holes are provided on the left walls 42 and 67 respectively. The five holes 164 are arranged in the X direction. The multiple holes 164 penetrate the right walls 38 and 66 and the left walls 42 and 67 respectively in the Y direction. The holes 164 are composed of multiple through holes divided by the dividing section 34.

[0179] like Figure 23 As shown, the two battery modules 16 each have battery columns SA, SB, SC, SD, SE, SF, SG and a cell holder 102. The two battery modules 16 are arranged with a first interval L3 in the X direction. Furthermore, regarding the battery columns SA, SB, SC, SD, SE, SF, SG, the configuration state of the multiple battery cells S is relative to the battery columns S1, S2, S3, S4, S5, S6, S7 (…). Figure 20 The reference numerals are different, hence the distinction in the attached diagram. Battery columns SA, SB, SC, SD, SE, SF, and SG, as an example, have six battery cells S facing the X direction and arranged in a zigzag pattern with their Y-direction positions alternating.

[0180] In the front battery module 16 in the X direction, the common tangent line on the rear side of the plurality of battery cells S located at the rear end is designated as common tangent line E3. Common tangent line E3 is along the Y direction. In the rear battery module 16 in the X direction, the common tangent line on the front side of the plurality of battery cells S located at the front end is designated as common tangent line E4. Common tangent line E4 is along the Y direction. The first interval L3 is the distance in the X direction between common tangent lines E3 and common tangent line E4. In other words, the first interval L3 is equivalent to the distance between the front battery module 16 and the rear battery module 16.

[0181] Battery rows SA, SB, SC, SD, SE, SF, and SG are positioned at intervals along the Y-direction. Taking battery rows SA and SB as examples, the smallest interval between battery cells S in battery row SA and battery cells S in battery row SB is defined as the second interval L4. As an example, the second interval L4 is the interval between battery cells S in the Y-direction. The second interval L4 is wider than the first interval L3. Thus, battery rows SA, SB, SC, SD, SE, SF, and SG are positioned at the second interval L4, which is more than one interval above the first interval L3, along the Y-direction.

[0182] [The function of the battery pack]

[0183] like Figure 23 As shown, in the battery pack 160, the second gap L4 between cells is wider than the first gap L3 between modules. That is, because the second gap L4 is wider than the first gap L3, air can easily pass through the flow path K between battery cells S.

[0184] On the other hand, between the two battery modules 16, airflow is difficult due to the small opening and higher pressure. In other words, air easily flows from between the two battery modules 16 to each flow path K. Therefore, for each battery cell S, the portion facing the flow path K is cooled by the airflow.

[0185] Furthermore, due to the aforementioned reasons, air has difficulty flowing between the two battery modules 16 and the right walls 38 and 66, and between the two battery modules 16 and the left walls 42 and 67. Here, multiple openings 164 are provided in the right walls 38 and 66 and the left walls 42 and 67. Figure 22 Therefore, air can flow in and out between the two battery modules 16 and the right walls 38, 66, and between the two battery modules 16 and the left walls 42, 67. Thus, for each battery cell S, not only the portion facing the flow path K can be cooled, but also the portions opposite to the right walls 38, 66 and the left walls 42, 67 can be cooled.

[0186] Thus, in the battery pack 160, since the second gap L4 is wider than the first gap L3, air can easily flow in the multiple flow paths K. Furthermore, due to the provision of multiple openings 164 (…),… Figure 22 Air can flow in and out between battery module 16 and right walls 38 and 66, and between battery module 16 and left walls 42 and 67. This promotes heat dissipation from the multiple battery cells S.

[0187] [Fourth Method]

[0188] The fourth embodiment will be described in detail with reference to the accompanying drawings.

[0189] Figure 24This indicates the battery pack 170 according to the fourth method. Additionally, with battery pack 10 ( Figure 1 Identical or substantially identical structures or elements shall use the same reference numerals, and repeated descriptions shall be omitted.

[0190] like Figure 25 As shown, for example, the battery pack 170 has two sets of cell groups 18, a housing portion 172, two sets of busbar portions 76, two terminals 84, and two cell holders 102. In other words, the battery pack 170 includes a housing portion 172 and two battery modules 16. Furthermore, the battery pack 170 has a BMU (Battery Management Unit) 192, a heat sink 194, plates 195 and 196, and a wiring harness 198. Additionally, in the battery module 16, the second spacing L2 ( Figure 20 ) compared to the first interval L1 ( Figure 20 Narrower.

[0191] BMU192 controls the charging and discharging of two battery modules 16. A heat sink 194 is mounted on BMU192 for heat dissipation. Plates 195 and 196 are mounted on the housing portion 172. BMU192 and heat sink 194 are fixed to plates 195 and 196. Wiring harness 198 electrically connects BMU192 to two terminals 84. Furthermore, BMU192, heat sink 194, and plates 195 and 196 are collectively referred to as housing component 191.

[0192] The housing member 191 is located inside the housing portion 172. Specifically, the housing member 191 is located between the rear walls 177 and 187 and the rear battery module 16. Furthermore, the housing member 191 and the hole portion 202 described later are opposite each other in the X direction.

[0193] The housing portion 172 is divided into upper and lower sections, comprising a lower housing 174 and an upper housing 184. As described above, the housing portion 172 houses two battery modules 16, two sets of busbar sections 76, and two terminals 84. Furthermore, the housing portion 172 houses a BMU 192, a heat sink 194, plates 195 and 196, and a wiring harness 198. A plug or connector (not shown) can be replaced on the housing portion 172. A plurality of slits 196A spaced apart in the Z direction are formed on the plate 196.

[0194] The lower housing 174 has a bottom wall 175, a front wall 176, a rear wall 177, a right wall 178, and a left wall 179. The bottom wall 175 is a plate-like portion with a specified thickness in the Z direction, formed into a rectangle with its X-direction dimension longer than its Y-direction dimension. The front wall 176 rises upright from the front end of the bottom wall 175. The rear wall 177 rises upright from the rear end of the bottom wall 175. The right wall 178 rises upright from the right end of the bottom wall 175. The left wall 179 rises upright from the left end of the bottom wall 175.

[0195] The upper ends of each of the front wall 176, rear wall 177, right wall 178, and left wall 179 are aligned. In other words, an upper end surface 174A is formed on the lower housing 174. The upper end surface 174A constitutes the upper and lower dividing surfaces of the housing portion 172.

[0196] The upper housing 184 has an upper wall 185, a front wall 186, a rear wall 187, a right wall 188, and a left wall 189. The upper wall 185 is a plate-like portion with a predetermined thickness in the Z direction, formed as a rectangle with a dimension in the X direction longer than its dimension in the Y direction. The front wall 186 extends downward from the front end of the upper wall 185. The rear wall 187 extends downward from the rear end of the upper wall 185. The right wall 188 extends downward from the right end of the upper wall 185. The left wall 189 extends downward from the left end of the upper wall 185.

[0197] The lower ends of each of the front wall 186, rear wall 187, right wall 188, and left wall 189 are aligned. In other words, a lower end face 184A is formed on the upper shell 184. The lower end face 184A, together with the upper end face 174A, constitutes the upper and lower dividing surfaces of the shell portion 172. The lower shell 174 and the upper shell 184 are engaged by claw portions and recessed portions (not shown) to form the shell portion 172.

[0198] Front walls 176 and 186 and rear walls 177 and 187 are examples of a pair of sidewalls spaced apart in the X direction. Front walls 176 and 186 have a plurality of holes 33. Rear walls 177 and 187 are examples of one of the pair of sidewalls. Right walls 178 and 188 and left walls 179 and 189 are examples of another pair of sidewalls. Right walls 178 and 188 and left walls 179 and 189 are located on the outer side in the Y direction relative to the two battery modules 16.

[0199] like Figure 24 As shown, the rear walls 177 and 187 have holes 202. The holes 202 penetrate the rear walls 177 and 187 in the X direction. In other words, the holes 202 are open in the X direction. As an example, the holes 202 have a first through hole 203 and second through holes 204 and 205. Furthermore, the holes 202 house component 191 (…). Figure 25 () Closed. In other words, the rear walls 177 and 187 are closed.

[0200] Four first through holes 203 are provided in total at the center of the rear walls 177 and 187 in the Y direction. The first through holes 203 expose the rear surface of the heat sink 194. The second through holes 204 are located to the left of the first through holes 203. The second through holes 204 expose the connector portion of the BMU 192 and the rear surface of the plate 195 to the rear. The second through holes 205 are located to the right of the first through holes 203. The second through holes 205 expose a portion of the heat sink 194 and the rear surface of the plate 196 to the rear.

[0201] like Figure 26 As shown, the portion of the housing 172 that houses the housing component 191 is designated as the BMU housing portion 172A, and the portion that houses the two battery modules 16 is designated as the module housing portion 172B. The length of the BMU housing portion 172A in the X direction is LA, and the length of the module housing portion 172B in the X direction is LB. As an example, the boundary position of the BMU housing portion 172A and the module housing portion 172B in the X direction is set at the rear end position of the unit holder 102 in the X direction.

[0202] The right walls 178, 188 and the left walls 179, 189 have vent holes 206. Specifically, the vent holes 206 are formed on the BMU housing portion 172A in the right walls 178, 188 and the left walls 179, 189. The vent holes 206 open outwards in the Y direction from between the closed rear walls 177, 187 and the rear battery module 16. In addition, the vent holes 206 penetrate the right walls 178, 188 and the left walls 179, 189 in the Y direction. Furthermore, the vent holes 206 are formed by a cutout portion 206A formed on the lower housing 174 and a cutout portion 206A formed on the upper housing 184. Figure 25 ) cut portion 206B ( Figure 25 )constitute.

[0203] [The function of the battery pack]

[0204] like Figure 27 As shown, the holes 202 in the rear walls 177 and 187 are closed by the housing component 191. Therefore, air AF on the outside of the housing 172 cannot pass through the holes 202.

[0205] Here, the BMU housing portion 172A in the right walls 178, 188 and the left walls 179, 189 has a vent 206 opening in the Y direction. Therefore, air AF can flow from the outside of the housing portion 172 into the interior of the housing portion 172 through the vent 206 and flow towards the multiple flow paths K. Then, by the air AF flowing into the interior of the housing portion 172 and flowing through the multiple flow paths K, the multiple battery cells S of the two groups of cells 18 can be cooled. This promotes heat dissipation from the multiple battery cells S. The air AF flowing in the flow paths K flows into the outside of the housing portion 172 from the holes 33 in the front walls 176, 186.

[0206] Furthermore, no holes are formed in the module receiving portions 172B in the right walls 178, 188 and the left walls 179, 189. Therefore, it is possible to prevent the air AF flowing into the housing portion 172 from immediately flowing out of the housing portion 172 through the vent 206. Additionally, the flow of air AF can be either forced flow or natural flow. That is, the flow of air AF can be forced flow generated by using a fan or other air supply unit, or it can be natural flow generated by a temperature difference.

[0207] [Variation Example]

[0208] Hereinafter, variations of the embodiments different from those described above will be described. Furthermore, structural elements that are the same as or identical to those in the embodiments described above will be labeled with the same reference numerals, and repeated descriptions will be omitted.

[0209] The first component 106 and the second component 126 only need to be able to hold multiple battery cells S, so they may not have walls. For example, instead of the first wall 116 and the second wall 136, multiple battery cells S can be held by multiple pins that are upright in the Z direction.

[0210] The cell holder 102 and the holding part 104 can also hold the multiple battery cells S in a configuration in which the multiple battery cells S are arranged in a straight line when viewed from the X direction. The holding part 104 is not limited to the component having the first component 106 and the second component 126. For example, it can also be composed of a component with a U-shaped shape in the YZ cross section that opens to one side in the Y direction.

[0211] A portion of the second wall portion 136 may not protrude more than the first surface 128A. For example, the position of the Z-direction end face of the second wall portion 136 may be aligned with the Z-direction position of the first surface 128A. Similarly, the first wall portion 116 may not be more recessed than the second surface 108B. For example, the position of the Z-direction end face of the first wall portion 116 may be aligned with the Z-direction position of the second surface 108B.

[0212] In the battery pack 10 and the cell holder 102, the housing portion 22 may not have the guide portion 51. For example, a positioning portion may be provided on the cell holder 102, and the cell holder 102 may be positioned by contact between the positioning portion and the housing portion 22.

[0213] The cutout 114 may be provided only on either the first component 106 or the second component 126. Alternatively, the protrusion 54 may be provided on the unit holder 102, and the cutout 114 may be provided on the guide 51. The shape of the vent 53 may also be a polygon other than a rectangle, a circle, or an oblong shape. Alternatively, the slots 124 and 144 may not be provided on the unit holder 102.

[0214] The number of cell holders 102 is not limited to two; it can also be one or more than three (a natural number n). In addition, in the battery pack 10, multiple cell holders 102 can be arranged not only in the X direction but also in the Y direction.

[0215] In this first embodiment, as an example, the battery pack 10 and the cell holder 102 may also be configured such that the central axis C of the battery cell S extends along the Z direction (vertical direction), and the central axis C extends along the X direction, Y direction, or an inclined direction intersecting these. The Z direction is only set as the vertical direction in the description of the configuration of each component, but the Z direction may also be set as the left-right direction, the front-back direction, or the inclined direction.

[0216] The number of battery cells S in the Y direction can be more than seven. Similarly, the number of battery cells S in the X direction can be more than six. For example, the multiple battery cells S constituting a battery array can be arranged in a linear pattern with n (2 or more) battery cells S arranged in the X direction and staggered in the Y direction, with n battery cells S arranged in a linear pattern. Alternatively, they can be arranged in a linear pattern with n battery cells S arranged in the X direction and staggered in the Y direction, with a number of battery cells S different from n arranged in a linear pattern. In short, in any two adjacent battery cells S included in each battery array, only two battery cells S staggered in the Y direction are required. This arrangement of multiple battery cells S allows the flow path K formed between the battery arrays to have a shape different from a straight line (e.g., a zigzag shape). This increases the contact area between the gas and the battery cells S, making it easier to generate turbulence and thus promoting heat dissipation from the battery cells S.

[0217] For the busbar section 76, the upper busbar 78 and the lower busbar 78 may each have different shapes. Similarly, the upper terminal 84 and the lower terminal 84 may each have different shapes.

[0218] The gas is not limited to air (AF); it can also be any gas other than air (AF). Alternatively, it can be a mixture of gases including air (AF).

[0219] The first interval L3 and the second interval L4 can also be equal.

[0220] The present invention has been specifically described above through various embodiments, but the present invention is not limited to these embodiments. Of course, various modifications can be made without departing from its spirit.

[0221] Explanation of reference numerals in the attached figures

[0222] 10…Battery pack, 16…Battery module, 22…Housing part, 32…Front wall (side wall), 33…Hole, 36…Rear wall (side wall), 37…Hole, 38…Right wall (other side wall), 42…Left wall (other side wall), 51…Guide part (positioning part), 52…Lower guide part (wall part), 53…Ventilation hole (hole), 54…Protrusion, 64…Front wall (side wall), 65…Rear wall (side wall), 66…Right wall (other side wall), 67…Left wall (other side wall), 72…Upper guide part (wall part) 76… Busbar section (conductive part), 78… Busbar (first conductive component, second conductive component), 102… Unit holder, 104… Holding part, 105… Opening part, 106… First component, 108… First frame part, 108B… Second surface (end face), 114… Cutout part, 116… First wall part, 124… Groove part, 126… Second component, 128… Second frame part, 128A… First surface (end face), 134… Cutout part, 136… Second wall part, 144… Groove part, 150 …battery pack, 160…battery pack, 164 hole (another hole), 170…battery pack, 172…casing, 176…front wall (side wall), 177…rear wall (side wall), 178…right wall (another side wall), 179…left wall (another side wall), 186…front wall (side wall), 187…rear wall (side wall), 188…right wall (another side wall), 189, left wall (another side wall), 206…vent, AF…air (gas), d1…space, d2…space, L1…first space, L2 …Second interval, L3…First interval, L4…Second interval, S…Battery cell, S1…Battery row, S2…Battery row, S3…Battery row, S4…Battery row, S5…Battery row, S6…Battery row, S7…Battery row, SA…Battery row, SB…Battery row, SC…Battery row, SD…Battery row, SE…Battery row, SF…Battery row, SG…Battery row, T1…Terminal section, T2…Terminal section, X…Direction (First direction), Y…Direction (Second direction), Y1…Interval, Z…Direction (Axial direction)

Claims

1. A cell holder for holding a plurality of battery rows in which a plurality of said battery cells are arranged in a first direction intersecting the axial direction of the battery cells, the cell holder comprising: A retaining part that holds the plurality of battery columns in a manner that allows them to be spaced apart in a second direction intersecting both the axial direction and the first direction; and An opening section that allows gas to enter and exit between the plurality of battery rows held in the holding section.

2. The unit holder according to claim 1, wherein, The holding portion holds the plurality of battery columns such that among the two battery cells included in each of the battery columns and adjacent to each other, there are two battery cells that are offset in position in the second direction.

3. The unit holder according to claim 1 or 2, wherein, The retaining part has: A first component that holds one end of the plurality of battery rows in the axial direction; and A second component that holds the other end of the plurality of battery rows in the axial direction; The first component and the second component are configured at intervals in the axial direction to function as the open portion.

4. The unit holder according to claim 3, wherein, The second component includes a plurality of second wall portions for holding the plurality of battery rows and a second frame portion for supporting the plurality of second wall portions. A portion of each of the plurality of second wall portions faces the first component and protrudes further than the axial end face of the second frame portion.

5. The unit holder according to claim 3, wherein, The first component includes a plurality of first wall portions for holding the plurality of battery rows and a first frame portion for supporting the plurality of first wall portions. The plurality of first wall portions are oriented to the side opposite to the second component and are more recessed than the end face of the first frame portion in the axial direction.

6. A battery module, the battery module comprising: Multiple battery rows, wherein multiple battery cells are arranged in a first direction intersecting the axial direction of the battery cells; and A cell holder that holds the plurality of battery columns in such a way that they are spaced apart in a second direction that intersects both the axial direction and the first direction; Each of the plurality of battery columns has battery cells arranged with the terminal portions of the battery cells having the same polarity, and the polarity of the terminal portions of the plurality of battery columns alternates in the second direction.

7. A battery pack having: Multiple battery rows, wherein multiple battery cells are arranged in a first direction intersecting the axial direction of the battery cells; A cell holder that holds the plurality of battery columns in such a way that they are spaced apart in a second direction that intersects both the axial direction and the first direction; A conductive portion extends in the first direction and electrically connects the terminal portions of the plurality of battery cells; as well as The housing portion, which houses the plurality of battery cells, the cell holder, and the conductive portion, includes a pair of sidewalls spaced apart in the first direction, the pair of sidewalls having openings in the first direction.

8. The battery pack according to claim 7, wherein, The cell holder holds the plurality of battery columns such that among two battery cells included in each of the battery columns and adjacent to each other, there are two battery cells that are offset in position in the second direction.

9. The battery pack according to claim 7, wherein, Each of the plurality of battery rows has battery cells arranged with the terminal portions having the same polarity, and the polarities of the terminal portions of the plurality of battery rows are alternately different in the second direction. The conductive portion electrically connects to a plurality of adjacent terminal portions in the second direction and extends in the first direction.

10. The battery pack according to claim 9, wherein, Multiple battery modules having the plurality of battery rows and the cell holder are arranged in the first direction. The conductive part has: A first conductive component is electrically connected to a plurality of terminal portions located at one end in the axial direction of the plurality of battery modules. The second conductive component is electrically connected to a plurality of terminal portions located at the other end of the axial direction in the plurality of battery modules. The first conductive component and the second conductive component are located in a column offset from the battery array in the second direction.

11. The battery pack according to any one of claims 7-10, wherein, The unit holder is provided with a groove that bends to both sides in the second direction and extends in the first direction to restrict the movement of the conductive part.

12. The battery pack according to any one of claims 7-10, wherein, The housing portion is provided with a positioning portion, which positions the unit holder in the first direction and the second direction.

13. The battery pack according to claim 12, wherein, The unit holder is provided with a recessed cutout in the first direction. The positioning part has a wall member that stands upright along the axial direction inside the housing part. The wall component is provided with: A hole penetrating the wall component in the first direction. A protrusion that can contact the cut portion.

14. The battery pack according to claim 8, wherein, The battery modules having the plurality of battery rows and the cell holder are spaced apart by a first interval and arranged in a plurality of such a manner in the first direction. The plurality of battery columns are located at a second interval that is narrower than the first interval in the second direction. The housing portion includes another pair of sidewalls, which are located on the outer side of the plurality of battery modules in the second direction and are opposite to the plurality of battery modules in the second direction. The other pair of sidewalls are closed.

15. The battery pack according to claim 14, wherein, One of the pair of sidewalls is closed. The other pair of sidewalls has vents that open outwards from between the enclosed sidewalls and the battery module.

16. The battery pack according to claim 8, wherein, The battery modules having the plurality of battery rows and the cell holder are spaced apart by a first interval and arranged in a plurality of such a manner in the first direction. The plurality of battery columns are located at a second interval, which is more than the first interval apart, in the second direction. The housing portion includes another pair of sidewalls, which are located on the outer side of the plurality of battery modules in the second direction and are opposite to the plurality of battery modules in the second direction. The other pair of sidewalls have additional openings facing the plurality of battery modules.

Images