Battery module

Abstract

The utility model provides a battery module capable of inhibiting position deviation of battery units in a structure formed by stacking a plurality of battery units. This battery module is provided with a laminate in which a plurality of battery cells and a plurality of resin frames are alternately laminated, the resin frames having: spacers sandwiched between the battery cells adjacent to each other in the lamination direction of the laminate; wedge-shaped parts which are provided further to the outside than the edge parts of the battery cells in an orthogonal direction orthogonal to the lamination direction, protrude from the spacer parts toward one side in the lamination direction, and are inclined toward the center axis side of the laminated body with respect to the lamination direction; and a guide part which is provided on the outside of the edge part of the battery cell in the orthogonal direction and protrudes from the spacer part toward the other side in the stacking direction, the wedge part being in contact with the guide part in a state of being inserted into the guide part of an adjacent resin frame. The laminated body is compressed in the lamination direction to bear a load acting from the guide portion toward the central axis side.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery module. BACKGROUND

[0002] In patent document 1, the following is disclosed: for a battery module in which a plurality of battery cells and a plurality of spacers are laminated, pressing in the lamination direction and release of the pressing, and pressing in a direction orthogonal to the lamination direction and release of the pressing are repeatedly performed at the time of lamination, thereby positioning the battery cells.

[0003] [Related Art Document]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2022-125550 SUMMARY

[0006] [Problems to be Solved by the Invention]

[0007] However, in the structure described in patent document 1, the face of the battery cell in the direction orthogonal to the lamination direction is not suppressed at the time of the process of finally pressing in the lamination direction, and thus the final battery cell can be shifted in position in the height direction and the width direction.

[0008] The utility model is completed in view of the above situation, and the purpose is to provide a battery module capable of suppressing the position shift of the battery cell in the structure in which a plurality of battery cells are laminated.

[0009] [Means for Solving the Problems]

[0010] The utility model relates to a battery module, have by a plurality of battery cells and a plurality of resin frame bodies alternately laminated laminated body, it is characterized in that, the resin frame body has: interval, by the battery cell of adjacent in the lamination direction of laminated body Clamping;Wedge portion, in the orthogonal direction that is orthogonal to the lamination direction, is arranged to the position of the outer side of the edge portion of the battery cell, protrudes from the interval to the side of the lamination direction, and is inclined to the central axis side of the laminated body relative to the lamination direction;And guide portion, in the orthogonal direction, is arranged to the position of the outer side of the edge portion of the battery cell, and protrudes from the interval to the other side of the lamination direction, the wedge portion is in the state of being inserted in the guide portion of adjacent resin frame body and is in contact with the guide portion, and the load acting from the guide portion to the central axis side is borne by the laminated body being compressed in the lamination direction.

[0011] [Effects of the Invention]

[0012] In the present utility model, the position deviation of the battery cell can be inhibited in the structure of the multiple battery cell laminations. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic view showing a battery module in an embodiment.

[0014] Figure 2 is a view for explaining the structure of the lamination.

[0015] Figure 3 is a view schematically showing the structure of the battery cell and the resin frame.

[0016] Figure 4 is a view schematically showing the structure of the resin frame.

[0017] Figure 5 is a view for explaining the case where the resin frame is composed of a thin frame and a thick frame. DETAILED DESCRIPTION

[0018] Hereinafter, the battery module in the embodiment of the present utility model will be specifically explained. In addition, the present utility model is not limited to the embodiment explained below.

[0019] Figure 1 is a schematic view showing a battery module in an embodiment. The battery module 1 is provided with a plurality of battery cells 2 and a plurality of resin frames 3. As shown in Figure 2 , the battery module 1 is provided with a lamination 10 in which the plurality of battery cells 2 and the plurality of resin frames 3 are alternately laminated. In addition, in the explanation below, the resin frame 3 will be simply referred to as the frame 3.

[0020] The battery cell 2 is composed of a secondary battery such as a lithium ion battery. The battery cell 2 is a square cell. The frame 3 is provided in a manner of surrounding the edge portion of the square shape of the battery cell 2. As shown in Figure 1 , one set of constituent members in which one battery cell 2 and one frame 3 are integrated is laminated multiple times in the lamination direction to constitute the lamination 10. That is, as one set of constituent members, it becomes a state in which one battery cell 2 is fixed to one frame 3.

[0021] The frame 3 is an insulating spacer disposed between the battery cells 2 adjacent in the lamination direction. The frame 3 is formed in a rectangular shape in a manner of matching the shape of the battery cell 2.

[0022] In the battery module 1, it is configured to make the wedge-shaped portions of the adjacent frames 3 themselves be axially aligned using the compression load at the time of compressing the lamination 10 in the lamination direction by providing the wedge-shaped portions at the outer peripheral portions of the frames 3. The battery module 1 has an axial alignment guide structure at the time of lamination pressurization that gives a conical shape to the frame 3.

[0023] Specifically, the frame 3 includes a spacer 30 sandwiched between adjacent battery cells 2 in the stacking direction of the stack 10, and a wedge-shaped portion and a guide portion integrally formed with the spacer 30. The wedge-shaped portion is a portion inclined toward the central axis CL of the stack 10 relative to the stacking direction. The wedge-shaped portion is located outward of the edge of the battery cell 2 in a direction perpendicular to the stacking direction and protrudes from the spacer 30 toward one side in the stacking direction. The guide portion is located outward of the edge of the battery cell 2 in a direction perpendicular to the stacking direction and protrudes from the spacer 30 toward the other side in the stacking direction. When inserted into the guide portion of an adjacent frame 3, the wedge-shaped portion abuts the guide portion, compressing the stack 10 in the stacking direction and thereby supporting loads acting from the guide portion toward the central axis CL. In the following description, the orthogonal direction perpendicular to the stacking direction is referred to as the "orthogonal direction." The "orthogonal direction" includes both the height and width directions.

[0024] like Figures 1 to 4 As shown, the frame 3 has a spacer 30, an upper wedge-shaped portion 31, a lower wedge-shaped portion 32, an upper guide portion 33, a lower guide portion 34, a one-side wedge-shaped portion 35, a second-side wedge-shaped portion 36, a one-side guide portion 37, and a second-side guide portion 38. The wedge-shaped portion of the frame 3 includes the upper wedge-shaped portion 31, the lower wedge-shaped portion 32, the one-side wedge-shaped portion 35, and the second-side wedge-shaped portion 36. The guide portion of the frame 3 includes the upper guide portion 33, the lower guide portion 34, the one-side guide portion 37, and the second-side guide portion 38.

[0025] The spacer 30 is a plate-shaped portion disposed between adjacent battery cells 2 in the stacking direction of the stack 10. The spacer 30 has a surface facing the battery cells 2 in the stacking direction. The spacer 30 is formed into a square shape that is slightly larger than the surface facing the battery cells 2 in the stacking direction.

[0026] The upper wedge-shaped portion 31 is provided above the upper edge 21 of the battery cell 2 in the height direction of the stack 10 and protrudes from the upper portion of the spacer 30 toward one side in the stacking direction. Figure 1 and Figure 2 As shown, the upper wedge-shaped portion 31 is inclined downward in the height direction from the upper portion of the spacer 30 toward the central axis CL. The upper wedge-shaped portion 31 is formed over a predetermined width in the width direction of the stacked body 10. For example, the upper wedge-shaped portion 31 is provided over a range that includes at least both ends of the frame 3 in the width direction.

[0027] The lower wedge-shaped portion 32 is provided at a position below the lower edge 22 of the battery cell 2 in the height direction of the stack 10 and protrudes from the lower portion of the spacer 30 toward one side in the stacking direction. Figure 1 and Figure 2As shown, the lower wedge portion 32 is inclined from the lower portion of the partition portion 30 toward the upper side in the height direction on the center axis CL side. The lower wedge portion 32 is formed in a range of a prescribed width in the width direction of the stack 10. For example, the lower wedge portion 32 is provided in a range at least including both end sides in the width direction of the frame 3. The rigidity of the lower wedge portion 32 is configured to be the same size as the rigidity of the upper wedge portion 31.

[0028] The upper guide portion 33 is a guide portion into which the upper wedge portion 31 of the adjacent frame 3 is inserted. The upper guide portion 33 is provided at a position on the upper side than the upper side edge portion 21 of the battery cell 2 in the height direction, and protrudes from the upper portion of the partition portion 30 toward the other side in the stacking direction. The upper guide portion 33 extends in parallel with the stacking direction. The upper guide portion 33 is formed at a position corresponding to the upper wedge portion 31 in the width direction of the stack 10. For example, the upper guide portion 33 is provided in a range at least including both end sides in the width direction of the frame 3. The upper wedge portion 31 abuts against the lower surface of the upper guide portion 33 in a state of being inserted into the upper guide portion 33.

[0029] The lower guide portion 34 is a guide portion into which the lower wedge portion 32 of the adjacent frame 3 is inserted. The lower guide portion 34 is provided at a position on the lower side than the lower side edge portion 22 of the battery cell 2 in the height direction, and protrudes from the lower portion of the partition portion 30 toward the other side in the stacking direction. The lower guide portion 34 extends in parallel with the stacking direction. The lower guide portion 34 is formed at a position corresponding to the lower wedge portion 32 in the width direction of the stack 10. For example, the lower guide portion 34 is provided in a range at least including both end sides in the width direction of the frame 3. The lower wedge portion 32 abuts against the upper surface of the lower guide portion 34 in a state of being inserted into the lower guide portion 34. The rigidity of the lower guide portion 34 is configured to be the same size as the rigidity of the upper guide portion 33.

[0030] In the adjacent frame 3, the stack 10 is compressed in the stacking direction, whereby a load on the lower side in the height direction acts on the upper wedge portion 31 from the upper guide portion 33, and a load on the upper side in the height direction acts on the lower wedge portion 32 from the lower guide portion 34. Thereby, a load acting on the center axis CL side is generated by the compression load in the stacking direction, and thus the alignment in the height direction of the battery cell 2 can be performed.

[0031] The one-side wedge portion 35 is provided at a position on the outer side than the one-side edge portion 23 of the battery cell 2 in the width direction of the stack 10, and protrudes from the end portion of the partition portion 30 toward one side in the stacking direction. As shown, the one-side wedge portion 35 is inclined from the end portion of the partition portion 30 toward the other side in the stacking direction on the one side in the width direction of the stack 10. The one-side wedge portion 35 is formed in a range of a prescribed width in the width direction of the stack 10. For example, the one-side wedge portion 35 is provided in a range at least including both end sides in the width direction of the frame 3. The rigidity of the one-side wedge portion 35 is configured to be the same size as the rigidity of the upper wedge portion 31. Figure 4As shown, the one-side wedge portion 35 is inclined from the end of the partition portion 30 toward the other side in the width direction toward the center axis CL side. The one-side wedge portion 35 is a vertical wall portion formed on the one side in the width direction of the frame body 3. On the one side in the width direction of the frame body 3, the one-side wedge portion 35 is formed throughout the entire region in the height direction of the frame body 3.

[0032] The other-side wedge portion 36 is provided on the other side in the width direction of the laminate 10 at a position outward of the other-side edge portion 24 of the battery cell 2 and protrudes from the end of the partition portion 30 toward the one side in the stacking direction. As shown, the other-side wedge portion 36 is inclined from the end of the partition portion 30 toward the one side in the width direction toward the center axis CL side. The other-side wedge portion 36 is a vertical wall portion formed on the other side in the width direction of the frame body 3. On the other side in the width direction of the frame body 3, the other-side wedge portion 36 is formed throughout the entire region in the height direction of the frame body 3. The rigidity of the other-side wedge portion 36 is configured to be the same size as the rigidity of the one-side wedge portion 35. Figure 4

[0033] The one-side guide portion 37 is a guide portion into which the one-side wedge portion 35 of the adjacent frame body 3 is inserted. The one-side guide portion 37 is provided on the one side in the width direction at a position outward of the one-side edge portion 23 of the battery cell 2 and protrudes from the end of the partition portion 30 toward the one side in the stacking direction. The one-side guide portion 37 extends in parallel with the stacking direction. The one-side guide portion 37 is formed in the height direction of the laminate 10 at a position corresponding to the one-side wedge portion 35. For example, the one-side guide portion 37 is formed throughout the entire region in the height direction of the frame body 3 on the one side in the width direction of the frame body 3. The one-side wedge portion 35 abuts against the inner surface of the one-side guide portion 37 in a state of being inserted into the one-side guide portion 37.

[0034] The other-side guide portion 38 is a guide portion into which the other-side wedge portion 36 of the adjacent frame body 3 is inserted. The other-side guide portion 38 is provided on the other side in the width direction at a position outward of the other-side edge portion 24 of the battery cell 2 and protrudes from the end of the partition portion 30 toward the one side in the stacking direction. The other-side guide portion 38 extends in parallel with the stacking direction. The other-side guide portion 38 is formed in the height direction of the laminate 10 at a position corresponding to the other-side wedge portion 36. For example, the other-side guide portion 38 is formed throughout the entire region in the height direction of the frame body 3 on the other side in the width direction of the frame body 3. The other-side wedge portion 36 abuts against the inner surface of the other-side guide portion 38 in a state of being inserted into the other-side guide portion 38. The rigidity of the other-side guide portion 38 is configured to be the same size as the rigidity of the one-side guide portion 37.

[0035] ​In the adjacent frame 3, the laminate 10 is compressed in the stacking direction, whereby the load on the lower side in the height direction is applied to the upper wedge portion 31 from the upper guide portion 33, and the load on the upper side in the height direction is applied to the lower wedge portion 32 from the lower guide portion 34. Thus, the load acting on the center axis CL side is generated by the compressive load in the stacking direction, and thus the alignment of the battery cell 2 in the height direction can be performed.

[0036] As explained above, according to the embodiment, the structure in which the wedge portion interferes with the guide portion by the pressurization when the laminate 10 is compressed in the stacking direction, and thus the laminate 10 itself can perform the axis alignment by the interference.

[0037] In addition, in the frame 3, the rigidity of the upper wedge portion 31 and the rigidity of the lower wedge portion 32 can be made different in size. The upper wedge portion 31 and the lower wedge portion 32 are made different in rigidity by providing ribs in the wedge portion to increase the rigidity, or changing the wall thickness of the wedge portion. For example, the frame 3 in which the rigidity of the upper wedge portion 31 is made lower than the rigidity of the lower wedge portion 32 is provided as a thin frame 3A, and the frame 3 in which the rigidity of the upper wedge portion 31 is made higher than the rigidity of the lower wedge portion 32 is provided as a thick frame 3B. In this case, as shown in FIG. 6, by providing the laminate 10 in which the thin frame 3A and the thick frame 3B are stacked at a prescribed ratio, the axis shift caused by the rigidity difference can be offset. Thus, the full length deviation of the laminate 10 can be absorbed. Figure 5

[0038] In addition, in the frame 3, the rigidity of the one wedge portion 35 and the rigidity of the other wedge portion 36 can be made different in size, like the upper wedge portion 31 and the lower wedge portion 32.

[0039] [Legend]

[0040] 1 battery module

[0041] 2 battery cell

[0042] 3 resin frame

[0043] 10 laminate

[0044] 21 upper edge portion

[0045] 22 lower edge portion

[0046] 23 one side edge portion

[0047] 24 other side edge portion

[0048] 30 spacer portion

[0049] 31 upper wedge portion

[0050] ​32 lower wedge

[0051] 33 upper guide

[0052] 34 lower guide

[0053] 35 one-side wedge

[0054] 36 other-side wedge

[0055] 37 one-side guide

[0056] 38 other-side guide

Claims

1. A battery module comprising a stacked body formed by alternately stacking a plurality of battery cells and a plurality of resin frames, characterized in that: The resin frame has: a spacer portion sandwiched between the battery cells adjacent to each other in the stacking direction of the stack; a wedge-shaped portion provided at an outer side of an edge of the battery cell in a direction perpendicular to the stacking direction, projecting from the spacer toward one side in the stacking direction, and inclined toward a central axis of the stack relative to the stacking direction; and a guide portion provided at an outer side than an edge of the battery cell in the orthogonal direction and projecting from the spacer toward the other side in the stacking direction; The wedge-shaped portion abuts against the guide portion of the adjacent resin frame while being inserted into the guide portion, and receives a load acting from the guide portion toward the central axis as the stacked body is compressed in the stacking direction.

2. The battery module according to claim 1, wherein: The wedge-shaped portion has: an upper wedge-shaped portion provided above an upper edge of the battery cell in a height direction of the stack; and The lower wedge-shaped portion is provided at a position below the lower edge of the battery cell in the height direction. The guide portion has: an upper guide portion for inserting the upper wedge-shaped portion; and A lower guide portion for inserting the lower wedge-shaped portion. In the adjacent resin frames, the stacked body is compressed in the stacking direction, so that the load on the lower side in the height direction acts on the upper wedge-shaped portion from the upper guide portion, and the load on the upper side in the height direction acts on the lower wedge-shaped portion from the lower guide portion.

3. The battery module according to claim 2, characterized in that The rigidity of the upper wedge-shaped portion is different from the rigidity of the lower wedge-shaped portion.

4. The battery module according to claim 2 or 3, characterized in that: The wedge-shaped portion has: a wedge-shaped portion on one side provided at an outer side than an edge portion on one side of the battery cell in the width direction of the stack; and The other side wedge-shaped portion is provided at a position outside the other side edge of the battery cell in the width direction. The guide portion has: a guide portion on one side for inserting the wedge-shaped portion on one side; and The other side guide portion is for inserting the other side wedge-shaped portion, In the adjacent resin frames, the stacked body is compressed in the stacking direction, so that the load on the other side in the width direction acts on the one wedge-shaped portion from the one guide portion, and the load on one side in the width direction acts on the other wedge-shaped portion from the other guide portion.

5. The battery module according to claim 4, characterized in that: The rigidity of the one side wedge-shaped portion is different from the rigidity of the lower side wedge-shaped portion.

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