Battery pack manufacturing method and battery pack

Abstract

This method for manufacturing a battery pack (10) is provided with: a step for applying a coating filler (150A) to at least a part of a housing body (200); and a step in which the battery module (100) is mounted on at least a portion of the housing body (200) with the coating filler (150A) interposed therebetween. In the step of coating the coating filler (150A), the coating filler (150A) has a pattern including a plurality of folded-back portions arranged alternately.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a battery pack and the battery pack. Background Art

[0002] In recent years, various battery packs have been developed that include multiple battery modules. For example, in the battery module described in Patent Document 1, the battery modules are fixed to a container. In this battery module, a heat-conducting member is provided between the battery modules and the container. The heat-conducting member is formed by coating.

[0003] Patent Document 2 describes a method for bonding battery cells to each other using an adhesive. In this method, the adhesive is provided in a stripe pattern parallel to the longitudinal direction of the battery cells.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2017 / 47211

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2006-172994 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] For example, as described in Patent Document 1, a filler, such as a heat-conducting component, is sometimes applied between the battery module and the container. The applied filler expands laterally due to compression between the battery module and the container. However, when simply applying the filler, the compressed and expanded filler may enclose air in some areas, creating areas not covered by the filler.

[0010] One example of the purpose of the present invention is to reduce the non-covered area of ​​the filler. Other purposes of the present invention will become clear from the description of this specification.

[0011] Means for solving problems

[0012] One embodiment of the present invention is as follows.

[0013] [1] A method for manufacturing a battery pack, comprising: a step of applying a filler on at least a portion of a container; and a step of mounting a battery module on the at least a portion of the container via the filler, wherein in the step of applying the filler, the filler has at least one of the following two patterns: a pattern including a plurality of folded portions arranged alternately; and a plurality of patterns arranged in a given direction with at least one of the ends of adjacent patterns staggered from each other.

[0014] [2] A battery pack comprising: a housing; and a battery module mounted on at least a portion of the housing via a filler, wherein the area of ​​the region entirely surrounded by the filler is less than 30% of the total area of ​​the filler.

[0015] Effects of the Invention

[0016] According to the above aspect of the present invention, the non-covered area of ​​the filler can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view of a battery pack according to an embodiment.

[0018] Figure 2 This is a plan view of a battery pack according to an embodiment with the upper case removed.

[0019] Figure 3 It is a plan view of a battery module according to the embodiment.

[0020] Figure 4 yes Figure 3 AA cross-section diagram.

[0021] Figure 5 It is a top view of the filler according to the embodiment.

[0022] Figure 6 It is a diagram for explaining a first example of the method for forming a filler according to the embodiment.

[0023] Figure 7 It is a diagram for explaining a second example of the method for forming a filler according to the embodiment.

[0024] Figure 8 It is a diagram for explaining a third example of the method for forming a filler according to the embodiment.

[0025] Figure 9 It is a top view of a packing according to a modification.

[0026] Figure 10 This is a diagram for explaining an example of a method for forming a filler according to a modification.

[0027] Figure 11 It is a top view of the filler according to the comparative example.

[0028] Figure 12 This is a diagram for explaining an example of a method for forming a filler according to a comparative example. DETAILED DESCRIPTION

[0029] Hereinafter, the embodiment and modification of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[0030] Figure 1 It is a perspective view of the battery pack 10 according to the embodiment. Figure 2 This is a plan view of the battery pack 10 according to the embodiment with the upper case 220 removed.

[0031] In the embodiment, the battery pack 10 is mounted in an automobile. Specifically, the battery pack 10 is mounted between the front and rear wheels of the automobile. Unless otherwise specified, the following description assumes that the battery pack 10 is mounted in an automobile. However, the battery pack 10 can also be used in applications other than automobiles.

[0032] In each figure, the X, Y, and Z directions are shown for illustration purposes. The X direction indicates the front-to-back direction of the battery pack 10. The Y direction is perpendicular to the X direction. The Y direction indicates the left-to-right direction of the battery pack 10. The Z direction is perpendicular to both the X and Y directions. The Z direction indicates the up-down direction of the battery pack 10. The arrows indicating the X direction, the Y direction, and the Z direction indicate the front, left, and up directions of the battery pack 10, respectively. Figure 2 In the figure, the white circle with a black dot indicates the Z direction, and the arrow indicating the Z direction extends from the back side of the paper to the front. However, the relationship between the X direction, Y direction, and Z direction and the front-back direction, left-right direction, and top-bottom direction of the battery pack 10 is not limited to this example.

[0033] In the embodiment, the front-to-back, left-to-right, and up-to-down directions of the battery pack 10 are determined by the vehicle in which the battery pack 10 is installed. The X, Y, and Z directions represent the front-to-back, left-to-right, and up-to-down directions of the vehicle, respectively. Arrows indicating the X, Y, and Z directions represent the front, left, and up directions of the vehicle, respectively. However, the relationship between the front-to-back, left-to-right, and up-to-down directions of the battery pack 10 and those of the vehicle is not limited to this example.

[0034] Hereinafter, the direction perpendicular to the Z direction will be referred to as a horizontal direction as needed.

[0035] The battery pack 10 includes four battery modules 100 and a housing 200. The four battery modules 100 include a pair of battery modules 100 on the left side arranged in the X direction and a pair of battery modules 100 on the right side arranged in the X direction. The housing 200 includes a lower housing 210 and an upper housing 220. The lower housing 210 is sometimes generally referred to as a tray or a main body. The lower housing 210 includes a lower plate 212 and side frames 214. The upper housing 220 is sometimes generally referred to as a cover or a lid. As described later, each battery module 100 includes a plurality of battery cells 102.

[0036] A pair of terminals 104 are provided in front of the side frame 214. The terminals 104 are arranged substantially parallel to the Y direction. The front end of each terminal 104 protrudes forward from the front surface of the side frame 214. In the electrical path, the four battery modules 100 are connected in series between the terminals 104.

[0037] The lower case 210 and the upper case 220 are mounted to each other via a sealing material 230. The lower case 210, the upper case 220, and the sealing material 230 form a housing space 250. The housing space 250 houses four battery modules 100.

[0038] The lower plate 212 defines the bottom of the storage space 250. The side frames 214 define the sides of the storage space 250. Specifically, as viewed from the Z direction, the side frames 214 are provided along the outermost periphery of the lower plate 212. The upper housing 220 defines the top of the storage space 250.

[0039] The sealing material 230 is an elastic material such as rubber. When viewed in the Z direction, the sealing material 230 is provided along the entire circumference of the side frame 214. Thus, when viewed in the Z direction, the sealing material 230 surrounds the storage space 250. Therefore, the sealing material 230 can seal the storage space 250 from the outside of the container 200.

[0040] The number and arrangement of the battery modules 100 are not limited to the examples described in the embodiment. For example, the number of battery modules 100 may be only two, only three, or five or more.

[0041] Figure 3 It is a plan view of the battery module 100 according to the embodiment. Figure 4 yes Figure 3 AA cross-section diagram. Figure 5 It is a top view of the filler 150 according to the embodiment. Figure 4 In the figure, a white circle with an X indicating the X direction indicates that an arrow indicating the X direction extends from the front to the back of the paper.

[0042] like Figure 4 As shown, the battery module 100 includes a cell stack 102G and a housing case 110 .

[0043] The cell stack 102G includes a plurality of battery cells 102. Figure 4 In the example shown, multiple battery cells 102 are stacked approximately parallel to the Y direction. For example, in a cell stack 102G, multiple battery cell groups are connected in series, each of which includes multiple battery cells 102 connected in parallel. Alternatively, multiple single battery cells 102 may be connected in series.

[0044] The housing 110 houses the unit stack 102G. The housing 110 includes a left cover 112, a right cover 114, a lower cover 116, an upper cover 118, a front cover (not shown), and a rear cover (not shown). The left cover 112 covers the left side of the unit stack 102G. The right cover 114 covers the right side of the unit stack 102G. The lower cover 116 covers the lower surface of the unit stack 102G via a thermally conductive adhesive 116a. The upper cover 118 covers the upper surface of the unit stack 102G. The front cover (not shown) covers the front surface of the unit stack 102G. The rear cover (not shown) covers the rear surface of the unit stack 102G.

[0045] The lower plate 212 includes an upper cooling plate 212a and a lower cooling plate 212b. The upper cooling plate 212a and the lower cooling plate 212b are made of metal, for example. Specifically, the upper cooling plate 212a and the lower cooling plate 212b are primarily composed of aluminum, for example. The upper cooling plate 212a and the lower cooling plate 212b overlap in the Z direction. A refrigerant 212c flows between the lower surface of the upper cooling plate 212a and the upper surface of the lower cooling plate 212b. The refrigerant 212c is a liquid such as water.

[0046] The lower housing 210 includes a support frame 216. The support frame 216 is a surrounding structure that surrounds at least a portion of the unit stack 102G when viewed in the Z direction. The support frame 216 is provided on the upper surface of the upper cooling plate 212a. Hereinafter, the portion of the support frame 216 located on the left side of the unit stack 102G will be referred to as the left support portion 216a. Hereinafter, the portion of the support frame 216 located on the right side of the unit stack 102G will be referred to as the right support portion 216b.

[0047] A left protrusion 122 is provided on the left outer side of the left cover 112. The left protrusion 122 protrudes to the left of the left cover 112. The left protrusion 122 is arranged on the upper surface of the left support portion 216a. The left protrusion 122 and the left support portion 216a are fastened to each other by a plurality of left bolts 162. Figure 3 As shown, the plurality of left bolts 162 are arranged substantially parallel to the X direction. However, the number and arrangement of the left bolts 162 are not limited to Figure 3 For example, the left protrusion 122 and the left support portion 216a may be fastened to each other by only a single left bolt 162.

[0048] A right protrusion 124 is provided on the right outer side surface of the right cover 114. The right protrusion 124 protrudes to the right of the right cover 114. The right protrusion 124 is arranged on the upper surface of the right support portion 216b. The right protrusion 124 and the right support portion 216b are fastened to each other by a plurality of right bolts 164. Figure 3As shown, a plurality of right bolts 164 are arranged substantially parallel to the X direction. However, the number and arrangement of the right bolts 164 are not limited to Figure 3 For example, the right protrusion 124 and the right support portion 216b may be fastened to each other by only a single right bolt 164.

[0049] The battery module 100 is mounted on the lower plate 212 via the filler 150. The filler 150 is disposed between the lower surface of the lower cover 116 and the upper surface of the upper cooling plate 212a. The filler 150 is compressed in the Z direction by the lower surface of the lower cover 116 and the upper surface of the upper cooling plate 212a.

[0050] In an embodiment, the filler 150 is a thermally conductive adhesive. Examples of the filler 150 include a modified silicone-based coated filler, a polyurethane-based coated filler, and an acrylic-based coated filler. Therefore, the lower surface of the lower cover 116 and the upper surface of the upper cooling plate 212a are physically bonded via the filler 150. Therefore, compared with a case where the filler 150 is not provided, the lower cover 116 and the upper cooling plate 212a can be less likely to be offset from each other. Furthermore, the lower surface of the lower cover 116 and the upper surface of the upper cooling plate 212a are thermally coupled via the filler 150. Therefore, compared with a case where the filler 150 is not provided, the heat generated in the battery module 100 can be easily released to the lower shell 210 via the thermally conductive adhesive 116a, the lower cover 116, and the filler 150.

[0051] like Figure 5 As shown, when viewed from the Z direction, the pattern of the filler 150 is formed by applying the filler 150 as described later. Figures 6 to 8 The filler in the exemplified substantially sawtooth pattern is compressed in the Z direction and extended in the horizontal direction. The filler applied in the substantially sawtooth pattern is compressed in the Z direction by the lower surface of the lower cover 116 and the upper surface of the upper cooling plate 212a.

[0052] like Figure 5As shown, filler 150 may have at least one uncovered area 152. Filler 150 is absent from the uncovered area 152. When viewed in the Z direction, the entire circumference of the uncovered area 152 is surrounded by filler 150. The uncovered area 152 is formed by air enclosed by filler that extends horizontally due to compression in the Z direction. The area of ​​the uncovered area 152 is preferably as small as possible. A larger uncovered area 152 can lead to poorer bonding between the lower surface of the lower cover 116 and the upper surface of the upper cooling plate 212a, poorer thermal conductivity between the lower surface of the lower cover 116 and the upper cooling plate 212a, and other degradations in the performance of the battery pack 10. However, in embodiments, the area of ​​the uncovered area 152 can be made smaller relative to the total area of ​​the filler 150 when viewed in the Z direction. Specifically, the area of ​​the uncovered area 152 relative to the total area of ​​the filler 150 when viewed in the Z direction is less than 30%, preferably less than 20%, more preferably less than 15%, and even more preferably less than 10%. The lower limit of the area of ​​the non-covered region 152 is not particularly limited, but is most preferably 0.

[0053] Figure 6 1 is a diagram for explaining a first example of a method for forming the filler 150 according to the embodiment. In this first example, the filler 150 is formed as follows.

[0054] First, a coating filler 150A is applied to the upper surface of the upper cooling plate 212a from a nozzle (not shown). When viewed from the Z direction, the coating filler 150A has a generally zigzag pattern. In the embodiment, the coating filler 150A alternately folds back between a region on one side of the Y-direction center of the cell stack 102G and a region on the other side of the Y-direction center of the cell stack 102G. However, the folded shape of the coating filler 150A can also be determined independently of the stacking direction of the multiple battery cells 102.

[0055] exist Figure 6 In the example shown, the pattern of the coating filler 150A includes a plurality of left folded portions 152A, a plurality of right folded portions 154A, and a plurality of extension portions 156A. The plurality of left folded portions 152A and the plurality of right folded portions 154A are alternately arranged. Figure 6 In the example shown, each left folded portion 152A extends substantially parallel to the X direction. Therefore, compared to a case where each left folded portion 152A extends obliquely to the X direction, the battery cell 102 located on the leftmost side of the cell stack 102G and the left folded portion 152A can be easily overlapped in the Z direction. Figure 6In the example shown, the battery cell 102 located on the leftmost side of the cell stack 102G can be cooled more easily than when each left folded portion 152A extends obliquely with respect to the X direction. However, each left folded portion 152A may also extend obliquely with respect to the X direction. The same applies to the right folded portion 154A. Figure 6 In the example shown, each extension portion 156A extends substantially linearly between each left-turned portion 152A and each right-turned portion 154A. Specifically, each extension portion 156A is inclined with respect to the Y direction when viewed from the Z direction.

[0056] In the embodiment, the coating filler 150A can be applied continuously along a substantially zigzag pattern. For example, when applying the coating filler 150A in a striped pattern, the application of the coating filler 150A would need to be interrupted while the nozzle moves between different lines of the striped pattern. In contrast, in the embodiment, the application of the coating filler 150A does not need to be interrupted. Therefore, in the embodiment, the tact time for applying the coating filler 150A can be shortened compared to when applying the coating filler 150A in a striped pattern.

[0057] Furthermore, in the embodiment, the amount of coating filler 150A can be more uniform across the entirety of the substantially sawtooth pattern, compared to when coating filler 150A is applied in a striped pattern. Specifically, a larger amount of coating filler 150A tends to be ejected from the nozzle immediately after the coating filler 150A is initially ejected and immediately before the coating filler 150A is ejected than during other periods. When coating filler 150A is applied in a striped pattern, as described above, the application of coating filler 150A must be interrupted while the nozzle moves between different lines of the striped pattern. Therefore, the amount of coating filler 150A at the ends of each line of the striped pattern tends to be greater than the amount of coating filler 150A between the ends of each line of the striped pattern. In contrast, in the embodiment, as described above, the application of coating filler 150A does not need to be interrupted. Therefore, in the embodiment, the amount of coating filler 150A can be more uniform across the entirety of the substantially sawtooth pattern, compared to when coating filler 150A is applied in a striped pattern.

[0058] Next, the battery module 100 is placed on the upper surface of the upper cooling plate 212a, with the coating filler 150A interposed therebetween. The left protrusion 122 and the left support 216a are then fastened to each other using the left bolt 162. Similarly, the right protrusion 124 and the right support 216b are fastened to each other using the right bolt 164. This compresses the coating filler 150A in the Z direction, through the lower surface of the plate c and the upper surface of the upper cooling plate 212a. Consequently, the coating filler 150A extends horizontally.

[0059] like Figure 6As shown, the pattern of the filler 150A defines a plurality of right openings 152aA and a plurality of left openings 154aA when viewed from the Z direction. Each right opening 152aA is located between adjacent right folded portions 154A in the X direction. Each left opening 154aA is located between adjacent left folded portions 152A in the X direction.

[0060] When the coating filler 150A extends horizontally due to compression in the Z direction, the periphery of each left folded portion 152A and each extended portion 156A extends primarily toward the right opening 152aA. Meanwhile, the periphery of each right folded portion 154A and each extended portion 156A extends primarily toward the left opening 154aA. Therefore, in this embodiment, the likelihood of air being trapped by the horizontally extending coating filler 150A can be reduced compared to a case where the pattern of the coating filler 150A is closed at the right opening 152aA and the left opening 154aA. Therefore, in this embodiment, the area of ​​the uncovered region 152 can be reduced or even eliminated compared to a case where the pattern of the coating filler 150A is closed at the right opening 152aA and the left opening 154aA.

[0061] The X-direction spacing between adjacent extension portions 156A across the left folded portion 152A increases as one moves from the left folded portion 152A toward the right folded portion 154A. Similarly, the X-direction spacing between adjacent extension portions 156A across the right folded portion 154A increases as one moves from the right folded portion 154A toward the left folded portion 152A. In other words, when viewed in the Z direction, the angle formed by the left folded portion 152A and the extension portion 156A is greater than 90°. The same applies to the angle formed by the right folded portion 154A and the extension portion 156A.

[0062] In one example, when viewed in the Z direction, the angle formed by the left folded portion 152A and the extension portion 156A is greater than 90°, preferably greater than 92°. The same applies to the angle formed by the right folded portion 154A and the extension portion 156A. In this case, compared to a case where the angle formed by the left folded portion 152A and the extension portion 156A and the angle formed by the right folded portion 154A and the extension portion 156A are less than 90°, the filler extending from the left folded portion 152A and the right folded portion 154A is less likely to trap air between adjacent extension portions 156A in the X direction.

[0063] In one example, the angle formed by the left folded portion 152A and the extension portion 156A, as viewed in the Z direction, is less than 110°, preferably less than 100°. The same applies to the angle formed by the right folded portion 154A and the extension portion 156A. In this case, the filler can be easily extended throughout the entire range between adjacent extension portions 156A in the X direction, compared to a case where the angle formed by the left folded portion 152A and the extension portion 156A and the angle formed by the right folded portion 154A and the extension portion 156A are greater than the aforementioned upper limit.

[0064] The unit stack 102G is used in vehicles such as automobiles and has a relatively high weight. Therefore, due to the weight of the unit stack 102G, the lower cover 116 sometimes bends in a convex shape toward the upper cooling plate 212a. If the thickness of the lower cover 116 in the Z direction is increased in order to suppress the deflection of the lower cover 116, the weight of the battery pack 10 will increase. Therefore, compared to increasing the thickness of the lower cover 116 in the Z direction, a certain deflection of the lower cover 116 can also be allowed. The maximum value of the deflection of the lower cover 116 is, for example, greater than 0.1 mm and less than 1.0 mm. When the maximum value of the deflection of the lower cover 116 is within this range, the thickness of the coating filler 150A can be easily made uniform by adjusting the material, thickness, fixing method, and other conditions of the upper cooling plate 212a according to the weight and size of the battery module 100. In the case where the lower cover 116 is deflected, the upper cooling plate 212a can also bend in the same way as the lower cover 116. When both the lower cover 116 and the upper cooling plate 212 a are bent into substantially the same shape, the thickness of the filler 150 between the lower cover 116 and the upper cooling plate 212 a can be easily made uniform.

[0065] Figure 7 1 is a diagram for explaining a second example of a method for forming the filler 150 according to the embodiment. Figure 7 The second example described is the same as the example using Figure 6 The same as the first example described.

[0066] Observed from the Z direction, Figure 7 The pattern of the coating filler 150B shown has a plurality of left folds 152B, a plurality of right folds 154B, and a plurality of extensions 156B. Figure 7 As shown, when viewed from the Z direction, each extension portion 156B may also be bent between each left folded portion 152B and each right folded portion 154B.

[0067] Figure 8 1 is a diagram for explaining a third example of a method for forming the filler 150 according to the embodiment. Figure 8 The third example described is the same as the example using Figure 6 The same as the first example described.

[0068] Observed from the Z direction, Figure 8 The pattern of the coating filler 150C shown has a plurality of left folds 152C, a plurality of right folds 154C, and a plurality of extensions 156C. Figure 8 As shown, when viewed from the Z direction, the extension portion 156C extending from the left folded portion 152C to the right folded portion 154C may also be substantially parallel to the Y direction. Figure 8 In the illustrated example, the right folded portion 154C extending from the right folded portion 154C toward the left folded portion 152C is inclined with respect to the Y direction when viewed from the Z direction.

[0069] Figure 9 It is a top view of a filler 150V according to a modification. Figure 10 This is a diagram for explaining an example of a method for forming the filler 150V according to a modification.

[0070] As in the embodiment, the pattern of the filler 150V is formed by applying the filler 150V as shown in FIG. Figure 10 The deformed stripe pattern shown is formed by compressing the filler in the Z direction and extending in the horizontal direction.

[0071] exist Figure 10 In the example shown, multiple roughly linear patterns formed by the coating filler 150VA are arranged at roughly equal intervals in a direction roughly parallel to the X direction. Each linear pattern extends roughly parallel to the Y direction. The Y lengths of each linear pattern are roughly equal. The Y centers of adjacent linear patterns in the X direction are offset from each other in the Y direction. Consequently, the Y ends of adjacent linear patterns in the X direction are offset from each other in the Y direction. The X-direction width of each linear pattern at its Y-direction ends is greater than the X-direction width of the portion between its Y-direction ends. This is because, as described above, when the coating filler 150VA is ejected from the nozzle (not shown) to form each linear pattern, a greater amount of coating filler 150A tends to be ejected immediately after the coating filler 150A is initially ejected and immediately before the coating filler 150A is ejected, compared to other periods. Therefore, the Z-direction thickness of each linear pattern at its Y-direction ends is greater than the Z-direction thickness of the portion between its Y-direction ends.

[0072] Figure 11 It is a top view of a filler 150K according to a comparative example. Figure 12 1 is a diagram for explaining an example of a method for forming a filler 150K according to a comparative example. The comparative example is the same as the modified example except for the following points.

[0073] like Figure 12As shown, the filler material 150KA forms a simple stripe pattern. The centers of the line patterns adjacent in the X direction are aligned in the Y direction. Therefore, the ends of the line patterns adjacent in the X direction are aligned in the Y direction.

[0074] The modified examples and comparative examples are compared.

[0075] In the comparative example, when the applied filler 150KA is compressed in the Z direction, the filler at both ends of each line pattern in the Y direction is more likely to extend in the horizontal direction than the filler between both ends of each line pattern in the Y direction. This is because, as described above, the amount of filler per unit area at both ends of each line pattern in the Y direction is greater than the amount of filler per unit area between both ends of each line pattern in the Y direction. Therefore, in the comparative example, as Figure 11 As shown, the fillers extending horizontally from both ends of each line pattern in the Y direction tend to surround the air between the line patterns adjacent in the X direction, and tend to form the uncovered area 152K.

[0076] In contrast, in a modified example, Figure 10 As shown, the Y-direction ends of adjacent line patterns in the X direction are offset from each other in the Y direction. Therefore, even if filler extends horizontally from the Y-direction ends of each line pattern, in the modified example, the filler extending horizontally from the Y-direction ends of each line pattern is less likely to trap air between adjacent line patterns in the X direction than in the comparative example. Consequently, the non-covered area can be reduced in the modified example compared to the comparative example.

[0077] In a modified example, Figure 10 As shown, the ends of the line patterns adjacent in the X direction are offset in the Y direction. However, it is also possible for only one of the ends of the line patterns adjacent in the X direction to be offset in the Y direction. In this example, the other ends of the line patterns adjacent in the X direction can also be aligned in the Y direction. In this example, the non-covered area can be reduced compared to the comparative example.

[0078] As mentioned above, although embodiment and modification of this invention were described with reference to drawings, these are illustrations of this invention, and various configurations other than the above-mentioned ones can also be adopted.

[0079] For example, the coating filler may be formed in a part of the region by the method described in the embodiment, and in another part of the region by the method described in the modification.

[0080] Example

[0081] One embodiment of the present invention will be described based on Example 1 and Comparative Example 1. The present invention is not limited to the following Example 1.

[0082] (Example 1)

[0083] The modified silicone-based coating filler is applied to the plate from a nozzle. Figure 6 The example described above also uses a roughly zigzag pattern. The length of each folded portion of the filler pattern is 25 mm. The length of each extended portion of the filler pattern is 300 mm. The angle formed by each extended portion and each folded portion is 93°. The filler pattern folds back 10 times on the left side and 10 times on the right side.

[0084] Next, the coated filler is compressed in a direction perpendicular to the plate. Figure 5 As described above, the filler is compressed by the applied filler, so that the filler extends in the horizontal direction. The area of ​​the non-covered region described in the embodiment is 10% of the total area of ​​the filler.

[0085] (Comparative Example 1)

[0086] Comparative Example 1 is the same as Example 1 except for the following points.

[0087] The filler was applied in a simple stripe pattern. The multiple line patterns included in the stripe pattern extended parallel to the arrangement direction of the multiple extensions of the substantially zigzag pattern in Example 1. The pitch of the multiple line patterns was set to 30 mm. The length of each line pattern was set to 30350 mm.

[0088] Next, the coated filler is compressed in a direction perpendicular to the plate. Figure 11 As described above, the filler is extended in the horizontal direction by compression of the applied filler. The area of ​​the non-covered region described in the embodiment is 30% of the total area of ​​the filler.

[0089] Comparison between Example 1 and Comparative Example 1 shows that when the applied filler is formed in a substantially zigzag pattern, the area of ​​the filler non-covered region can be reduced compared to when the applied filler is formed in a simple stripe pattern.

[0090] This application claims the benefit of priority based on Japanese patent application No. 2023-009523, filed on January 25, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0091] Explanation of symbols

[0092] 10 battery packs

[0093] 100 battery modules

[0094] 102 battery cells

[0095] 102G unit stack

[0096] 104 terminal

[0097] 110 housing

[0098] 112 Left hood

[0099] 114 Right hood

[0100] 116 Lower hood

[0101] 116a Thermally conductive adhesive

[0102] 118 Upper cover

[0103] 122 Left protrusion

[0104] 124 Right protrusion

[0105] 150, 150K, 150V filler

[0106] 150A, 150B, 150C, 150KA, 150VA coated filler

[0107] 152, 152K non-coverage area

[0108] 152A, 152B, 152C left turn

[0109] 152aA Right opening

[0110] 154A, 154B, 154C right turn

[0111] 154aA Left opening

[0112] 156A, 156B, 156C extensions

[0113] 162 left bolt

[0114] 164 right bolt

[0115] 200 container

[0116] 210 lower shell

[0117] 212 Lower plate

[0118] 212a Upper cooling plate

[0119] 212b lower cooling plate

[0120] 212c refrigerant

[0121] 214 side frame

[0122] 216 Support frame

[0123] 216a Left support

[0124] 216b Right support

[0125] 220 upper shell

[0126] 230 Sealing material

[0127] 250 accommodating space.

Claims

1. A method for manufacturing a battery pack, comprising: The step of applying a filler to at least a portion of the container; and a step of mounting a battery module on at least a portion of the housing via the filler, In the step of applying the filler, the filler has at least one of the following two patterns: A pattern comprising a plurality of turns arranged alternately; and A plurality of patterns arranged in a given direction with at least one of the ends of adjacent patterns offset from each other.

2. A battery pack comprising: a container; and The battery module is mounted on at least a portion of the housing via a filler. The area of ​​the region entirely surrounded by the filler is less than 30% of the total area of ​​the filler.

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