Power storage module

Abstract

The power storage module includes a plurality of power storage cells, a resin frame, and a case. The resin frame has: a sandwiching section sandwiched between the pair of power storage cells; and a flow path forming part for forming a flow path of the cooling fluid. The flow path forming section has: a one-side flow path forming section provided in a region on one side in the second direction of the sandwiching section; and the other-side flow path forming part is arranged in a region on the other side of the clamping part in the second direction. The cross-sectional moment of inertia of the one flow path forming portion is larger than the cross-sectional moment of inertia of the other flow path forming portion. The spring constant of the other flow path forming portion in the first direction is larger than the spring constant of the one flow path forming portion in the first direction.

Description

Technical Field

[0001] The present disclosure relates to a power storage module. Background Art

[0002] For example, Japanese Patent Laid-Open No. 2022-163449 discloses a battery pack comprising: a battery stack formed by alternately stacking a plurality of battery cells and a plurality of resin frames in an arrangement direction; and a lower shell that accommodates the battery stack. The battery stack is accommodated in a compressed state in the arrangement direction. The lower shell opens upward. The resin frame has a plurality of comb teeth extending in the arrangement direction on at least one side of the surface opposite to the battery cell. The plurality of comb teeth include a plurality of upper comb teeth and a plurality of lower comb teeth. The plurality of upper comb teeth are located above the center of the battery cell in the height direction. The plurality of lower comb teeth are located below the center of the height direction. The plurality of upper comb teeth are configured so that the lower the upper comb teeth are, the lower the height of the comb teeth in the arrangement direction.

[0003] The battery pack described in Japanese Patent Application Laid-Open No. 2022-163449 has the following concern: when the moment of inertia of the cross section of the plurality of upper comb teeth is greater than the moment of inertia of the cross section of the plurality of lower comb teeth, the battery stack may deform in a convex manner upward. Summary of the invention

[0004] An object of the present disclosure is to provide a power storage module capable of suppressing deformation of a plurality of power storage cells and a resin frame so as to bulge toward an opening side of a case.

[0005] A storage battery module according to one aspect of the present disclosure comprises: a plurality of storage battery cells arranged side by side in a first direction; a resin frame arranged between a pair of storage battery cells adjacent to each other among the plurality of storage battery cells; and a shell constraining the plurality of storage battery cells from both sides in the first direction and accommodating the plurality of storage battery cells and the resin frame, the shell opening toward one side in a second direction orthogonal to the first direction.

[0006] The resin frame includes an interposed portion interposed between the pair of power storage cells and a flow path forming portion provided on a surface of the interposed portion facing the power storage cells, the flow path forming portion forming a flow path of a cooling fluid for cooling the power storage cells.

[0007] The flow path forming portion includes: a one-side flow path forming portion provided in a region of the sandwich portion on the one side in the second direction; and an other-side flow path forming portion provided in a region of the sandwich portion on the other side in the second direction.

[0008] The cross-sectional inertia moment of the one side flow path forming portion is greater than the cross-sectional inertia moment of the other side flow path forming portion. The spring constant of the other side flow path forming portion in the first direction is greater than the spring constant of the one side flow path forming portion in the first direction.

[0009] According to the present disclosure, it is possible to provide a power storage module capable of suppressing deformation of a plurality of power storage cells and a resin frame so as to bulge toward an opening side of a case. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Hereinafter, features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described with reference to the accompanying drawings, wherein like reference numerals denote like elements, and wherein:

[0011] Figure 1 It is a plan view schematically showing the structure of a power storage module according to one embodiment of the present disclosure.

[0012] Figure 2 yes Figure 1 Cross-sectional view at line II-II in .

[0013] Figure 3 This is the front view of the resin frame.

[0014] Figure 4 yes Figure 3 Cross-sectional view at line IV-IV in FIG.

[0015] Figure 5 yes Figure 3 Cross-sectional view at line V-V in .

[0016] Figure 6 It is a cross-sectional view schematically showing a modified example of the resin frame. DETAILED DESCRIPTION

[0017] The embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that in the drawings referred to below, the same or corresponding components are denoted by the same reference numerals.

[0018] Figure 1 It is a plan view schematically showing the structure of a power storage module according to one embodiment of the present disclosure. Figure 2 yes Figure 1 This power storage module 1 is mounted on a vehicle, for example.

[0019] like Figure 1 and Figure 2 As shown, the power storage module 1 includes a plurality of power storage cells 100 , a plurality of resin frames 200 , an end plate 300 , a case 400 , and an elastic member 500 .

[0020] The plurality of power storage units 100 are arranged in a first direction ( Figure 1 The storage cells 100 are arranged side by side in the left-right direction. For example, a lithium-ion battery is used as the storage cell 100. Each storage cell 100 is formed into a flat rectangular parallelepiped.

[0021] Each resin frame 200 is disposed between a pair of adjacent power storage cells 100 .

[0022] The end plates 300 are disposed on both sides of the battery stack (the plurality of power storage cells 100 and the plurality of resin frames 200 ) in the first direction.

[0023] The housing 400 constrains the plurality of power storage units 100 from both sides in the first direction and accommodates the plurality of power storage units 100 and the resin frame 200. The housing 400 faces one side in the second direction orthogonal to the first direction ( Figure 2 Specifically, the housing 400 has a bottom wall 410 (see Figure 2 ), disposed below the battery stack; and a pair of constraint walls 420 (reference Figure 1 ), and are arranged on both sides of the battery stack in the first direction. Each of the restraining walls 420 rises from the end of the bottom wall 410 in the first direction. A pair of restraining walls 420 restrains the battery stack from both sides in the first direction.

[0024] The elastic member 500 is disposed between the bottom wall 410 and the battery stack. The elastic member 500 has a shape that is long and extends in the first direction. The elastic member 500 is used to prevent the cooling fluid (air, etc.) supplied between the battery stack and the bottom wall 410 from passing through the pair of power storage units 100 and flowing toward the sides ( Figure 2 Components that leak out in the left and right directions.

[0025] Next, refer to Figures 3 to 5 The resin frame 200 will be described in detail. The resin frame 200 includes an interposing portion 210 and a flow path forming portion 220 .

[0026] The intervening portion 210 is interposed between a pair of power storage cells 100. The intervening portion 210 has a function of ensuring insulation between a pair of adjacent power storage cells 100. The intervening portion 210 is formed of, for example, PP (polypropylene) or PE (polyethylene).

[0027] The flow path forming portion 220 is provided on the surface of the sandwiching portion 210 that faces the power storage unit 100. The flow path forming portion 220 forms a flow path for a cooling fluid (fluid supplied between the bottom wall 410 and the battery stack) for cooling the power storage unit 100. Figure 3 As shown by the middle arrow, the flow path forming portion 220 is formed into a shape that guides the cooling fluid supplied from the bottom to the top of the sandwiching portion 210 toward the side (a direction orthogonal to both the first direction and the second direction) of the sandwiching portion 210. It should be noted that the flow direction of the cooling fluid may also be opposite to the direction of the arrow. The flow path forming portion 220 has a one-side flow path forming portion 222 and a second-side flow path forming portion 224.

[0028] The one-side flow path forming portion 222 is provided in a region of the sandwiching portion 210 on the one side in the second direction (the side where the housing 400 is opened). Figure 4 As shown, the one-side flow path forming portion 222 is formed integrally with the sandwiching portion 210 by the same material as that of the sandwiching portion 210 .

[0029] The other-side flow path forming portion 224 is provided in a region of the interposed portion 210 on the other side in the second direction (in the present embodiment, on the bottom wall 410 side).

[0030] The shape of the flow path forming portion 220 is set so that the cross-sectional inertia moment of the flow path forming portion 222 on one side is greater than the cross-sectional inertia moment of the flow path forming portion 224 on the other side. Figure 3 As shown, the volume of the portion extending continuously in the width direction (a direction orthogonal to both the first direction and the second direction) in the one-side flow path forming portion 222 is larger than the volume of the portion extending continuously in the width direction in the other-side flow path forming portion 224 .

[0031] The spring constant of the other side flow path forming portion 224 in the first direction is greater than the spring constant of the one side flow path forming portion 222 in the first direction. In the present embodiment, the other side flow path forming portion 224 includes a rising portion 225 and a surrounding portion 226 .

[0032] The rising portion 225 rises from the sandwich portion 210. The rising portion 225 is formed integrally with the sandwich portion 210 from the same material as that of which the sandwich portion 210 is formed.

[0033] The surrounding portion 226 surrounds the rising portion 225. The protruding dimension of the surrounding portion 226 from the sandwiching portion 210 is smaller than the protruding dimension of the rising portion 225 from the sandwiching portion 210. In other words, the rising portion 225 protrudes from the surrounding portion 226.

[0034] In this embodiment, the surrounding portion 226 and the rising portion 225 are formed separately. Figure 5 As shown, the rising portion 225 has a holding portion 225a for holding the surrounding portion 226 and a clamping portion 225b provided at the top end of the holding portion 225a. The holding portion 225a is connected to the clamping portion 210. The clamping portion 225b clamps the surrounding portion 226 together with the clamping portion 210. That is, the clamping portion 225b has a function of preventing the surrounding portion 226 from detaching from the holding portion 225a.

[0035] The surrounding portion 226 has a bending rigidity higher than the compressive elastic modulus of the rising portion 225 in the first direction. The surrounding portion 226 is formed of metal, fiber reinforced plastics (FRP: Fiber Reinforced Plastics), or the like.

[0036] As described above, in the power storage module 1 of the present embodiment, the cross-sectional moment of inertia of the one side flow path forming portion 222 is greater than the cross-sectional moment of inertia of the other side flow path forming portion 224. The spring constant of the other side flow path forming portion 224 in the first direction is greater than the spring constant of the one side flow path forming portion 222 in the first direction. Therefore, the battery stack (a plurality of power storage cells 100 and the resin frame 200) is suppressed from deforming in a manner of convexly convexing toward one side in the second direction (the side where the housing 400 is opened).

[0037] It should be noted that if Figure 6 As shown, the other side flow path forming portion 224 may also be formed of a material different from the material forming the clamping portion 210 and the one side flow path forming portion 222 (for example, PPS (polyphenylene sulfide), PEEK (polyetheretherketone), fiber reinforced PP / PE, stainless steel, steel, aluminum). In this case, the resin frame 200 may also be formed by two-color molding. In addition, with respect to the other side flow path forming portion 224, it may also be that the other side flow path forming portion 224 is connected to the clamping portion 210. Alternatively, although the illustration is omitted, the one side flow path forming portion 222 may also be formed of a material different from the material forming the clamping portion 210 and the other side flow path forming portion 224 (for example, PPS, PEEK, fiber reinforced PP / PE, stainless steel, steel, aluminum). In any case, the materials of the one side flow path forming portion 222 and the other side flow path forming portion 224 are selected so that the spring constant of the other side flow path forming portion 224 in the first direction is greater than the spring constant of the one side flow path forming portion 222 in the first direction.

[0038] Those skilled in the art will appreciate that the above exemplary embodiments are specific examples of the following schemes.

[0039] Solution 1

[0040] A storage module comprises: a plurality of storage cells arranged side by side in a first direction; a resin frame arranged between a pair of storage cells adjacent to each other among the plurality of storage cells; and a housing constraining the plurality of storage cells from both sides in the first direction and accommodating the plurality of storage cells and the resin frame, the housing opening toward one side in a second direction orthogonal to the first direction, the resin frame comprising: a sandwiching portion sandwiched between the pair of storage cells; and a flow path forming portion provided on a surface of the sandwiching portion facing the storage cells, the flow path forming portion forming a flow path of a cooling fluid for cooling the storage cells, the flow path forming portion comprising: a one-side flow path forming portion provided in a region of the sandwiching portion on the one side in the second direction; and a another-side flow path forming portion provided in a region of the sandwiching portion on the other side in the second direction, the one-side flow path forming portion having a greater cross-sectional moment of inertia than the other-side flow path forming portion, and a spring constant of the other-side flow path forming portion in the first direction being greater than a spring constant of the one-side flow path forming portion in the first direction.

[0041] In the power storage module, the cross-sectional inertia moment of the flow path forming portion on one side is greater than the cross-sectional inertia moment of the flow path forming portion on the other side. The spring constant of the flow path forming portion on the other side in the first direction is greater than the spring constant of the flow path forming portion on the one side in the first direction. Therefore, the plurality of power storage cells and the resin frame are prevented from deforming in a manner that bulges toward one side in the second direction (the side of the housing opening).

[0042] Solution 2

[0043] The power storage module according to claim 1, wherein the other-side flow path forming portion includes a rising portion rising from the sandwiching portion and a surrounding portion surrounding the rising portion, the rising portion protruding from the surrounding portion.

[0044] In this embodiment, the rising portion receives a compressive load in the first direction, and the rising portion is restricted from expanding in a direction perpendicular to the first direction by the surrounding portion. Therefore, the spring constant of the other side flow path forming portion is greater than the spring constant of the one side flow path forming portion.

[0045] Solution 3

[0046] The power storage module according to claim 2, wherein the surrounding portion and the rising portion are formed separately.

[0047] In this aspect, the spring constant of the other-side flow path forming portion can be easily adjusted by adjusting the thickness or material of the surrounding portion.

[0048] Solution 4

[0049] The power storage module according to claim 3, wherein the surrounding portion has a bending rigidity higher than a compressive elastic modulus of the rising portion.

[0050] Solution 5

[0051] The power storage module according to claim 3 or 4, wherein the rising portion includes: a holding portion that holds the surrounding portion; and a clamping portion that is provided at a tip of the holding portion and clamps the surrounding portion together with the sandwiching portion.

[0052] In this aspect, the surrounding portion is prevented from being separated from the rising portion.

[0053] It should be noted that the embodiments disclosed herein are illustrative in all aspects and are not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and includes all changes within the meaning and scope equivalent to the claims.

Claims

1. A power storage module comprising: A plurality of power storage units are arranged side by side in a first direction; a resin frame disposed between a pair of mutually adjacent power storage cells among the plurality of power storage cells; as well as a housing that constrains the plurality of storage cells from both sides in the first direction and accommodates the plurality of storage cells and the resin frame, the housing opening toward one side in a second direction orthogonal to the first direction, The resin frame has: an interposing portion interposed between the pair of power storage units; and a flow path forming portion provided on a surface of the sandwiched portion facing the power storage unit, the flow path forming portion forming a flow path of a cooling fluid for cooling the power storage unit, The flow path forming portion has: a one-side flow path forming portion, provided in a region of the sandwiching portion on the one side in the second direction; as well as The other side flow path forming portion is provided in a region on the other side of the sandwich portion in the second direction, The cross-sectional inertia moment of the one side flow path forming portion is greater than the cross-sectional inertia moment of the other side flow path forming portion, The spring constant of the other-side flow path forming portion in the first direction is greater than the spring constant of the one-side flow path forming portion in the first direction.

2. The power storage module according to claim 1, wherein: The other side flow path forming portion comprises: a rising portion rising from the sandwiching portion; and a surrounding portion, surrounding the rising portion, The rising portion protrudes from the surrounding portion.

3. The power storage module according to claim 2, wherein: The surrounding portion is formed separately from the rising portion.

4. The power storage module according to claim 3, wherein: The surrounding portion has a bending rigidity higher than a compressive elastic modulus of the rising portion.

5. The power storage module according to claim 3 or 4, wherein: The rising portion has: a holding portion that holds the surrounding portion; and The clamping portion is arranged at the top end of the holding portion and clamps the surrounding portion together with the clamping portion.

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