Battery module and battery device

Abstract

To provide a battery module which can improve the cooling efficiency.SOLUTION: The battery module includes: a plurality of battery cells 10 laminated on one another; a spacer 12 provided in an edge part of the battery cell 10; and a heat transfer plate 20 having a heat absorption part 20a arranged among the plurality of laminated battery cells 10 and absorbing heat of the battery cell 10, and a heat releasing part 20b releasing heat absorbed into the heat absorption part 20a to the outside. The heat releasing part 20b is bent to the heat absorption part 20a and is exposed from among the battery cells 10 and is in contact with the spacer 12. The spacer 12 includes: a contact part 126 having a contact surface 260 in contact with the heat releasing part 20b; and a positioning part 127a having a surface 270 in a direction opposite to the contact surface 260 faces and defining a position of the spacer 12.SELECTED DRAWING: Figure 16

Description

[Technical field]

[0001] The present invention relates to a battery module and a battery device. [Background technology]

[0002] For example, Patent Document 1 discloses a battery module having a plurality of battery cells held by a cell holder, the battery cells being arranged via a heat transfer plate. The heat transfer plate has a first portion that is inserted between adjacent battery cells and a second portion that is exposed to the outside of the battery module and faces a side wall of the cell holder. The first portion of the heat transfer plate is attached to the battery cells provided in the cell holder in such an arrangement that the second portion abuts against the side wall of the cell holder. Then, the cell holders provided with the heat transfer plate are arranged in a stacked manner and restrained by a restraining member to obtain an integrated array.

[0003] The array is fixed to a wall of a metal housing that houses the battery modules via a heat conductive member. The heat conductive member is compressed by the array and the wall of the housing, and is in close contact with the second portion of the heat transfer plate and the wall. Heat generated in the battery cells is dissipated to the housing via the heat transfer plate and the heat conductive member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-41583 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the battery module described in Patent Document 1, before stacking the cell holders, the second portion of the heat transfer plate is positioned so as to abut against the side wall of the cell holder, and then multiple cell holders with the heat transfer plate are stacked. Therefore, when stacking multiple cell holders, there is a risk of the cell holders being misaligned, and the positions of the second portions of the multiple heat transfer plates are likely to become non-uniform with respect to the opposing heat conductive member. If the positions of the second portions pressed against the heat conductive member are non-uniform, the surface pressure of the second portions varies, resulting in a problem that the cooling performance of each cell holder differs. [Means for solving the problem]

[0006] (1) A battery module according to a first aspect of the present invention comprises a plurality of stacked battery cells, a spacer provided at an end of the battery cells, and a heat transfer plate having a heat absorption portion disposed between the plurality of stacked battery cells and absorbing heat from the battery cells, and a heat dissipation portion that dissipates the heat absorbed by the heat absorption portion to the outside, wherein the heat dissipation portion is bent with respect to the heat absorption portion to be exposed between the battery cells and abuts against the spacer, and the spacer comprises an abutment portion having an abutment surface abutting against the heat dissipation portion, and a positioning portion having a surface facing opposite to the abutment surface and determining the position of the spacer 12. (2) A battery device according to a second aspect of the present invention comprises the battery module and the battery The heat transfer plate is pressed against each heat dissipation portion of the heat transfer plate provided in the thermal module through a heat conductive sheet, A cooling member that absorbs heat from the heat dissipation portion. (3) A method for manufacturing a battery module according to a third aspect of the present invention includes: a plurality of heat transfer plates disposed between the stacked battery cells; and a spacer provided at an end of the battery cell. A method for manufacturing a battery module having a heat absorbing portion disposed between cells and a heat dissipating portion exposed to the outside of stacked battery cells and facing the spacer, comprising the steps of: A first step of stacking a number of the battery cells and a number of the heat transfer plates; Then, the plurality of heat dissipation parts are collectively pressed toward the spacer by a pressing tool to form a plurality of heat dissipation parts. Each of the heat dissipation parts is brought into contact with the spacer facing it, and the positions of the spacers are adjusted. and a second step of aligning the positions of the plurality of heat dissipation portions. Effect of the Invention

[0007] According to the present invention, it is possible to improve the cooling performance of the battery module. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a battery module according to the present embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the battery module. [Diagram 3] FIG. 3 is a diagram showing a part of the battery device. [Figure 4] FIG. 4 is a perspective view of a battery cell with a spacer attached. [Diagram 5] FIG. 5 is a perspective view showing the upper surface side of the spacer. [Figure 6] FIG. 6 is a diagram showing the back surface side of the spacer. [Figure 7] FIG. 7 is a diagram showing a cell body and a pair of spacers. [Figure 8] FIG. 8 is a diagram showing a heat transfer plate attached to the back surface side of the battery cell. [Figure 9] FIG. 9 is a diagram illustrating the rough positioning of the heat transfer plate. [Figure 10] FIG. 10 is a diagram illustrating rough positioning of spacers during stacking of battery cells. [Figure 11]FIG. 11 is a diagram for explaining a method for collectively correcting misalignment of spacers and heat transfer plates when a plurality of battery cells are stacked. [Figure 12] FIG. 12 is a diagram showing a step subsequent to the step shown in FIG. [Figure 13] FIG. 13 is a diagram showing a step subsequent to the step shown in FIG. [Figure 14] FIG. 14 is a diagram for explaining the bending angle of the heat transfer plate, etc. [Figure 15] FIG. 15 is a diagram showing a first step in the manufacturing process of the battery module. [Figure 16] FIG. 16 is a diagram showing a second step in the manufacturing process of the battery module. [Figure 17] FIG. 17 is a diagram showing a third step in the manufacturing process of the battery module. [Figure 18] FIG. 18 is a diagram showing a fourth step in the manufacturing process of the battery module. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same elements are designated by the same reference numerals, and duplicated explanations will be omitted. The size and proportions of the materials may be exaggerated for the purposes of explanation and may differ from the actual size and proportions. In the XYZ coordinates shown in each figure, the X direction is the battery cell installed in the battery module. The Y direction indicates the direction along the long side of the battery cell, and the Y direction indicates the direction along the short side of the battery cell. , the Z direction indicates the stacking direction of the battery cells.

[0010] FIG. 1 is a perspective view of a battery module 1 according to the present embodiment. FIG. 1 is an exploded perspective view of a battery module 1. The battery module 1 shown in FIG. When the battery pack is mounted on a vehicle such as an electric vehicle, the number of battery modules 1 according to the vehicle is set. The vehicle is equipped with sensors and controllers for monitoring and controlling each battery module 1. The battery pack is installed in the vehicle as a power supply unit (also called a battery pack) housed in a case suitable for both vehicles. It will be published.

[0011] The battery module 1 includes a plurality of stacked battery cells (also called single cells) 10. In the example shown in FIGS. 1 and 2, ten battery cells 10 are stacked in the Z direction. However, the number of the battery cells 10 is not limited to this. The battery cell 10 includes a cell body 100 and The battery cell 10 is made up of a positive electrode tab 101 and a negative electrode tab 102. A spacer 11 is attached to one end in the longitudinal direction, and a spacer 12 is attached to the other end in the longitudinal direction. A pair of spacers 11 and 12 attached to the battery cell 10 This is a member that determines the stacking interval of the battery 10, i.e., the interval in the Z direction. The side of the cell 10 where the spacer 11 is attached is called the front side, and the side where the spacer 12 is attached is called the front side. The side where the spacers 11 and 12 are attached will be referred to as the rear side.

[0012] Side wall plates 13 are provided on both side surfaces of the battery module 1 in the Y direction. A pressure plate 14a is provided on the upper surface of the battery module 1 in the Z direction, and a pressure plate 14b is provided on the lower surface of the battery module 1 in the Z direction. The battery module 1 is provided with a pressure plate 14b. The battery module 1 is provided with a spacer 11. A bus bar module 15 is provided on the front surface. The through bolt 22 (see FIG. 3) used to fasten the battery module 1 to the power supply device housing The battery module 1 has four through holes 140 through which the battery 1 is inserted. The side wall plate 13 is made up of a plurality of battery cells 10 with spacers 11 and 12 attached thereto. The laminate of the plurality of heat transfer plates 20 is pressed by the upper and lower pressing plates 14a and 14b. 4a, 14b are welded to the sides thereof.

[0013] The bus bar module 15 is made up of a plurality of bus bars (not shown) provided on a stack of the battery cells 10. The busbar module 15 is connected to a terminal 17 on the front side thereof. The terminal 17 is also connected to a resin cover 11 on the front side thereof. A pair of terminal covers 19 are provided on the upper surface of the terminal 17. The stack of battery cells 10 includes a heat transfer plate 2 for cooling the battery cells 10. The heat transfer plate 20 is L-shaped and is inserted between the battery cells 10. and a heat dissipation portion 20b exposed on the rear side of the stack of battery cells 10. The heat absorbing portion 20a is sandwiched between the cell bodies 100 of the upper and lower battery cells 10. The heat generated in the cell body 100 is transferred from the cell body 100 to the heat absorbing portion 20a. It is achieved.

[0014] When the power supply device having the battery module 1 is mounted on a vehicle, A cooling member is provided to remove heat from the battery device 400. FIG. In the battery device 400, the cooling plate 21 cooled by the refrigerant is As shown in FIG. 3, the battery module 1 has ten The battery cells 10 are stacked, and four heat transfer plates 20 are arranged between the stacked battery cells 10. The heat transfer plate 20 is disposed between the second battery cell 10 from the bottom and the third battery cell 10 from the bottom. 10, between the fourth and fifth battery cells 10, between the sixth and sixth battery cells 10, Between the battery cell 10 in the seventh row and the battery cell 10 in the eighth row, and the ninth battery cell 10. However, the battery cells 10 stacked vertically, and the battery cells 10 and the heat transfer plate 20 The heat absorbing portion 20a is bonded to the L-shaped heat transfer plate 20 by adhesive. The portion 20b is exposed from the laminated region so as to be bent upward in the figure, and the heat transfer plate abutment portion of the spacer 12 The heat transfer plate 20 is disposed so as to face the heat dissipation portion 20b of the heat transfer plate abutment portion 126. The heat transfer plates 20 are positioned so as to be in close contact with the contact surface 260 of the heat transfer plate 26. The positions are not limited to those shown in FIG.

[0015] The battery module 1 is fixed to a power supply device housing (not shown) by through bolts 22. The cooling plate 21 is pressed toward the heat dissipation portion 20b of the heat transfer plate 20 by the retainer 27. The retainer 27 is fixed to the bracket 24 by a bolt 25 and a nut 26. The bracket 24 is fixed to the battery module 1 by a through bolt 22. Between the cooling plate 21 and the heat dissipation portion 20b of the heat transfer plate 20, a A thermally conductive sheet 23 having a thickness of about 1 to 2 mm is provided on the It is a heat conductive member for absorbing the unevenness of the number of heat dissipation parts 20b in the X direction, and is generally used as a thermal This is called an interface material, and an elastic material with excellent thermal conductivity is used.

[0016] The cooling plate 21 is pressed against the heat dissipation portion 20b of the heat transfer plate 20 via the heat conductive sheet 23. This allows the heat of the heat transfer plate 20 to escape to the cooling plate 21 via the heat conduction sheet 23. The cooling plate 21 is formed with a refrigerant flow path 210, through which the cooling medium flows from the heat transfer plate 20. The heat transferred to the plate 21 is dissipated to the coolant flowing through the coolant flow passage 210 .

[0017] FIG. 4 is a perspective view of the battery cell 10 to which the spacers 11 and 12 are attached. As described above, the battery cell 10 is made up of a cell body 100 and a front side of the cell body 100. The battery has a positive electrode tab 101 and a negative electrode tab 102 that are provided so as to protrude from the battery. A spacer 11 is attached to the front end of the cell 10, and a spacer 12 is attached to the rear end. The spacers 11 and 12 are made of a resin material.

[0018] 5 and 6 are diagrams showing the spacers 11 and 12. FIG. 5 shows the upper surfaces of the spacers 11 and 12. 6 is a perspective view showing the rear side of the spacers 11 and 12. Reference numeral 11 denotes a cell support portion 110 extending in the Y direction and a pair of electrodes provided at both ends of the cell support portion 110. The cell support 110 has a pair of lamination parts 112. The upper surface of the cell support 110 has a pair of connecting pins 111. Each laminated portion 112 is provided with a metal collar 113 having a through hole 113a. The through bolts are inserted to secure the battery module 1 to the power supply unit housing. The bolt 22 (see FIG. 3) is inserted into the through hole 113 a of the metal collar 113 .

[0019] The spacer 11 has recesses 114a and 114b formed on the upper surface side at both ends in the Y direction. In addition, the spacer 11 has recesses 114a and 114b at both ends in the Y direction on the rear surface side thereof. Convex portions 115a and 115b are formed on the recess 114a (see FIG. 6). The recessed portion 114b and the protruding portion 115 are formed substantially coaxially with each other in the Z direction. b is formed almost coaxially with respect to the Z direction. When stacking the battery cells 10, the protrusions 115a are inserted into the recesses 114a, and the recesses 114 The protrusion 115b is inserted into b.

[0020] The spacer 12 includes a cell support portion 120 extending in the Y direction and a pair of stacking portions 123. The upper surface of the cell support portion 120 is provided with a pair of connecting pins 121 and ten connecting pins 12 Each laminated portion 123 has a metal collar 124a formed therein. The through-bolt 22 shown in FIG. As shown in FIG. 5, the spacer 12 is inserted into the through hole 124a at the end of the spacer 12 in the positive X direction. A pair of heat transfer plate abutment portions 126 are formed on the heat transfer plate 20. As shown in FIG. The inner surface of the rising wall of the heating portion 20b is in close contact with the contact surface 260, which is the outer wall surface of the heat transfer plate contact portion 126. It is positioned to

[0021] The spacer 12 has recesses 125a and 125b formed on the upper surface thereof. As shown in the figure, the back surface of the spacer 12 has protrusions corresponding to the recesses 125a and 125b. The recess 125a and the protrusion 128a are formed in the Z direction. Similarly, the recessed portion 125b and the protruding portion 128b are formed substantially coaxially with each other. When stacking the battery cells 10, the recess 125a is formed substantially coaxially. The protrusion 128a is inserted into the recess 125b, and the protrusion 128b is inserted into the recess 125b. On the rear surface of the heat transfer plate 2, protrusions 129a and 129b are formed to be used for rough positioning of the heat transfer plate 20. It has been done.

[0022] A pair of protrusions 127a and 127b are provided on the outer circumferential surface of the spacer 12 in the Y-axis direction of the spacer 12. In FIG. 5, the protrusion 127a is formed so as to protrude on both sides of the spacer 12. The protrusion 127b protrudes in the positive direction of the Y axis when viewed from the center of the spacer 12. The protrusions 127a and 127b are positioning protrusions used when aligning the positions of the spacers 12 when a plurality of battery cells 10 are stacked. A positioning method using the projections 127a and 127b will be described later.

[0023] As shown in FIG. 6, the surface 2 on the front side (negative direction of the X-axis) of the protrusions 127a and 127b The direction of the normal vector of the surface 270 is such that the heat dissipation portion 20b of the heat transfer plate 20 is The contact surface 260 faces in the opposite direction. A positioning jig is brought into contact with each of the surfaces 270 of the spacers 12 of the terricel 10. In other words, the surface 270 is the spacer 12 in the stacked state. It functions as a reference surface for positioning the sensor 12. A space S1 for placing a jig is secured.

[0024] FIG. 7 shows a cell body 100 and a pair of casings attached to both ends of the cell body 100 in the longitudinal direction. The figure shows spacers 11 and 12. The cell body 100 is a laminate film that holds the power generating element. The cell body 100 is a flat lithium ion secondary battery sealed in a plastic bag. The cell body 100 is electrically connected to the laminate film container. A plate-shaped positive electrode tab 101 and a negative electrode tab 102 are provided.

[0025] A pair of connecting holes 103 are formed at the front end of the laminated film bag of the cell body 100. The connecting pins 111 formed on the spacer 11 on the front side are inserted into the connecting holes 103. The laminated film bag of the cell body 100 has a pair of connecting holes 1 at the rear end thereof. 04 is formed, and a pair of connecting pins 121 formed on both ends of the rear spacer 12 are Furthermore, the center of the rear end of the laminate film bag of the cell body 100 is Ten connecting holes 105 are formed in the spacer 12. Each connecting hole 105 is connected to the center of the spacer 12. The connecting pins 122 formed in the respective portions are inserted through the connecting pins 122.

[0026] The spacers 11 and 12 are made of resin and are inserted into the connecting holes 103 of the cell body 100. By heat caulking the connecting pin 111, a spacer is attached to the front side of the cell body 100. Similarly, the connecting pin 11 is inserted into the connecting hole 104 of the cell body 100. 21 and the connecting pin 122 inserted into the connecting hole 105 are thermally caulked to form a cell body. A spacer 12 is fixed to the rear side of the body 100. The positive electrode tab 101 and the negative electrode tab 102 are , and is exposed on the spacer 11 side.

[0027] In the example shown in FIG. 3, the heat transfer plate 20 is disposed between the second battery cell 10 from the bottom and the third battery cell 10 from the bottom. between the fourth and fifth battery cells 10; Between the battery cell 10 in the 1st row and the battery cell 10 in the 7th row, and between the battery cell 10 in the 8th row The heat transfer plate 20 is provided between the cell 10 and the ninth battery cell 10. Before stacking the battery cells 10, the heat absorbing portion 20a of the cell body 100 of the battery cell 10 is It is attached to the back side (the lower surface in the figure).

[0028] FIG. 8 is a diagram showing the heat transfer plate 20 attached to the back side of the cell body 100. The L-shaped is made of metal with excellent thermal conductivity such as copper or aluminum. The heat transfer plate 20 has a heat absorbing portion 20a inserted between the battery cells 10 and an exposed portion on the rear side of the stack. and a heat dissipation portion 20b that is in contact with the heat transfer plate contact portion 126 of the spacer 12. The heat absorbing portion 20a of the heat plate 20 is formed with through holes 200a and 200b for positioning. The through holes 200a and 200b are provided with the protrusions 129a formed on the rear surface of the spacer 12. , 129b are inserted, the heat transfer plate 20 is roughly positioned relative to the spacer 12. can be.

[0029] [Positioning mechanism for battery module 1] Next, a positioning mechanism in the battery module 1 of this embodiment will be described. In order for the battery module 1 to exhibit its performance, it is necessary to dissipate heat generated by the cell main body 100 efficiently. In this embodiment, the battery cell 10 is provided with a laminated body. A part of the heat transfer plate 20 (heat dissipation part 20b) is exposed to the outside of the laminate, and the heat conductive sheet 23 is The heat is dissipated from the heat dissipation portion 20b to the cooling plate 21 through the above-mentioned Thus, the thermally conductive sheet 23 is generally called a thermal interface material. Thermal interface materials are used to connect heat-generating devices and heat sinks. It has the function of filling small gaps and unevenness between the heat sink and the heat sink, and efficiently transferring heat to the heat sink. The thermally conductive sheet 23 in this embodiment is arranged such that the heat dissipation portions 20b are arranged in the X direction. The heat transfer plate 20 absorbs the unevenness of the heat transfer plate 20 and efficiently transfers heat to the cooling plate 21. The thickness of the thermally conductive sheet 23 is set to a value that can absorb the unevenness of the heat dissipation portion 20b. In order to reduce the thermal resistance of the thermally conductive sheet 23 itself, it is preferable that the sheet is thinner. In practice, the thickness of the thermally conductive sheet 23 is set to about 1 to 2 mm.

[0030] By the way, the positional deviation in the X direction between the stacked battery cells 10 and the If the positional deviation of the heat transfer plate 20 with respect to the filter 10 in the X direction is large, each The positions of the heat dissipating parts 20b become uneven. The contact pressure between the heat portion 20b and the heat conductive sheet 23 varies, and the contact of some of the heat dissipation portions 20b becomes uneven. As a result, the heat dissipation performance of each battery cell 10 may vary. This can easily lead to problems such as:

[0031] In the battery module 1 of the present embodiment, the following positioning (1) to (3) is performed. We try to do this. (1) When attaching the heat transfer plate 20 to the battery cell 10, the heat transfer plate 20 is attached to the spacer 12. Rough positioning of. (2) Rough positioning of the upper and lower spacers when stacking the battery cells 10. (3) The spacer 12 and the heat transfer plate 20 when multiple battery cells 10 are stacked The misalignment of parts can be corrected all at once using a jig.

[0032] (1. Rough positioning of heat transfer plate 20 relative to spacer 12) FIG. 9 is a diagram for explaining the rough positioning of the heat transfer plate 20 in (1) above. When mounting the spacer 12 on the back side of the battery cell 10, the spacer 12 is attached to the back side of the battery cell 10 by using a cylindrical projection 14 formed on the back side of the spacer 12. The portions 129a and 129b are inserted into the corresponding through holes 200a and 200b of the heat transfer plate 20. This provides a spacer 12 and a battery cell 10 to which the spacer 12 is attached. The heat transfer plate 20 is roughly positioned.

[0033] As shown in FIGS. 8 and 9, the through holes 200a and 200b are elongated holes that are long in the X direction. The dimension in the Y direction is A and the dimension in the Y direction is B. The dimensions A and B, the outer diameter D of the protrusions 129a and 129b, and The relationship between the projections 129a, 129b and the through holes 200a, 200b is A>B>D. For example, AD = 1.6 mm, BD = 0. The protrusions 129a, 129b and the through holes 200a, 200b are set to about 6 mm. By providing a positioning mechanism, the rotational deviation of the heat transfer plate 20 as shown by the two-dot chain line in FIG. The heat transfer plate 20 can be roughly positioned easily. In order to suppress the rotational deviation of the heat transfer plate 20 as much as possible, the positioning points are at least At least two locations are required, and it is desirable to place them on both sides of the heat transfer plate 20 in the Y direction.

[0034] Here, a clearance is provided between the protrusions 129a, 129b and the through holes 200a, 200b. The reason why the heat transfer plate 20 is positioned roughly instead of precisely is to The reasons for this are as follows: By providing clearance, the assembly workability is improved. The heat transfer plate 20 is formed by bending a metal plate into an L-shape. Therefore, the spacer 12 and the heat transfer plate 20 are susceptible to processing errors, and if a high positioning accuracy is set, the processing errors make assembly difficult, resulting in poor workability.

[0035] In addition, as described later, after stacking the battery cells 10, the heat dissipation portion 20b of the heat transfer plate 20 At that time, the heat dissipation part 20b is pressed in the positive direction of the X-axis by a jig. Then, the heat dissipation portion 20b is brought into contact with the contact surface 260 of the heat transfer plate contact portion 126 of the spacer 12 and positioned. Therefore, before the heat dissipation portion 20b abuts against the heat transfer plate abutment portion 126, the protrusion 129a , 129b so as not to come into contact with the edges of the through holes 200a, 200b. 0b is a long hole in the X direction. Of course, a circular through hole is also acceptable, but the clear hole in the X direction is If the lance is the same as the long hole, the clearance in the Y direction will be larger than that of the long hole, and the heat transfer The rotational deviation of the plate 20 (see FIG. 9) is larger than that in the case of a long hole. By making a, 200b a long hole in the X direction, rotation is possible while securing clearance in the X direction. The deviation can be reduced to a smaller extent.

[0036] (2. Rough positioning of upper and lower spacers) FIG. 10 shows the relationship between the upper and lower spacers 12 when stacking the battery cells 10 in (2) above. FIG. 5 is a diagram for explaining rough positioning of the battery cells 10 in two tiers, one above the other, in the EE of FIG. 10(a) shows two battery cells 10 before being stacked; FIG. 10(b) shows the battery cells after stacking. In either case, the heat transfer plate 20 is attached to the battery cell 10 on the upper side. (shown by dashed double-dashed lines) is attached.

[0037] The protrusion 128a formed on the back surface of the spacer 12 is, for example, a cylindrical protrusion. The recess 125a formed on the upper surface side of the spacer 12 is a rectangular recess. The diameter D1 of the recess 125a and the length H of one side of the recess 125a are set to have a relationship of H>D1, For example, H-D1 is set to about 0.6 mm. As shown in FIG. 10(a), When the upper battery cell 10 is stacked on the cell 10, the stacked portion 12 of the lower spacer 12 3 comes into contact with the lower surface 123b of the laminated portion 123 of the upper spacer 12. Then, the tip of the protrusion 128a is inserted into the recess 125a. Therefore, as shown in FIG. 10(b), between the side surface of the protrusion 128a and the side surface of the recess 125a Therefore, when stacking, the upper and lower spacers 12 are in the X and Y directions. Even if the projection 128a and the recess 125a are misaligned within the range of the clearance, the projection 128a and the recess 125a can be engaged with each other. This allows rough positioning within the clearance range.

[0038] Regarding the positioning of the battery cells 10, the spacer attached to the battery cell 10 By using such a rough positioning mechanism for the positioning of the actuators 12, the ease of assembly is improved. Furthermore, the projection 128a and the recess 125a are spaced apart from each other in the X and Y directions. Since there is a clearance in the X direction, the spacer 12 can be moved in the X direction by using a jig as described later. When aligning the positions of the battery cells 10 in the X direction, the range of clearance is For example, the position of the heat transfer plate contact portion 126 (FIG. 5) may vary, the clearance in the X direction will allow The spacer is integrated with the cell body 100 of the battery cell 10 to absorb the variations. 12, that is, the X-direction position of the abutment surface 260 can be aligned.

[0039] Furthermore, in this embodiment, a layer of battery cells in the battery module 1 is laminated The thickness dimension in the direction is the height h of the laminated portion 123 formed on the spacer 12, that is, the thickness dimension in the direction from the upper surface 1 The upper surface 123a is defined by a distance h between the heat transfer plate contact portion 12 6, and the lower surface 123b is the heat transfer plate contact portion with which the heat absorbing portion 20a comes into contact. The heat transfer plate 20 protrudes downward beyond the lower ends of the upper and lower heat transfer plate abutment portions 126. The heat sink 20b is exposed to the outside through the gap. The height dimension of the stack of the battery cells 10 and the heat transfer plates 20, i.e., the battery module The height dimension of the battery module 1 is constant regardless of the thickness or number of the heat transfer plates 20, so that the height dimension of the battery module 1 can be reduced.

[0040] In addition, since the height dimension of the battery module 1 is constant regardless of the number of heat transfer plates 20, The number of heat transfer plates 20 can be changed depending on the application, or the heat transfer plate 20 can be omitted. In addition, the height-dependent parts of the battery module 1 can be shared. As shown in FIG. 2, the side wall plate 13, the busbar module 15, the terminal 17, the resin cover There are 18 etc.

[0041] In addition, for the spacer 11 on the front side, the upper and lower spacers 11 are roughly positioned. As shown in FIGS. 5 and 6, the spacer 11 has a cylindrical protrusion 1 on the rear side thereof. The spacer 11 has rectangular recesses 114a, 115b on its upper surface. Therefore, when the spacers 11 are stacked vertically, the lower spacer The protrusions 15a and 115b of the upper spacer 11 are fitted to the recesses 114a and 114b of the spacer 11, respectively. In this case, the length of one side of the rectangular cross section of the recesses 114a and 114b is the same as that of the protrusion 11 The diameter of the protrusions 115a and 15b is set to be larger than that of the recesses 114a and 115b. , 114b roughly position the spacers 11 relative to each other.

[0042] (3. Correction of misalignment of the spacer 12 and the heat transfer plate 20 at once) 11 to 13 show the spacer 12 and the battery cell 10 in a stacked state. 11 to 13 are diagrams for explaining a method for collectively correcting the misalignment of the positions of the heat transfer plates 20 and the heat transfer plates 20. In the illustrated example, three battery cells 10 are stacked. The heat absorbing portion 20a between the layered battery cells 10 and between the battery cells 10 and the heat transfer plate 20 The parts are attached with adhesive, but the adhesive must be in an uncured state before they can be corrected. In the following, the three battery cells 10 are stacked in the order of the upper, middle, and lower stages. In each of Figs. 11 to 13, (a) is a view seen from the Z-axis positive direction. , and (b) is a view seen from the negative Y-axis direction.

[0043] FIG. 11 is a diagram showing the position state before the misalignment is corrected. As shown in FIG. The heat transfer plate 20 is connected to the bottom surface of the upper battery cell 10 and the bottom surface of the lower battery cell 10. It should be noted that the above is not limited to FIG. 11(a), and any other drawings viewed from the Z-axis positive direction are also possible. In 11(a), 12(a), and 13(a), the lower battery cell 10 and the lower The heat transfer plate 20 is not visible because it is blocked by the upper and middle battery cells 10. The spacer 12 attached to the battery cell 10 has a protrusion 14 on the spacer 12. Only the beginnings 127a and 127b are shown.

[0044] As shown in FIG. 11(b), the upper battery cell 1 0 is displaced in the positive direction of the X axis by an amount of displacement ΔX2, and the lower battery cell 10 is X The upper heat transfer plate 20 is displaced in the positive axial direction by a displacement amount ΔX4. The reseal 10 is displaced by a displacement amount ΔX1 in the positive direction of the X axis with respect to the spacer 12 attached to the reseal 10. The spacer 12 is misaligned with the heat dissipation portion 20b of the heat transfer plate 20. A gap equal to the amount of deviation ΔX1 is generated. The spacer 12 attached to the mount 10 is shifted in the positive direction of the X-axis by an amount of deviation ΔX3. There is no misalignment between the contact surface 260 of the spacer 12 and the heat dissipation portion 20b of the heat transfer plate 20. A gap equal to the amount ΔX3 has occurred.

[0045] In the stacked state, the convex portions 128a, 128b formed on the back surface of the upper spacer 12 28b (see FIG. 6) are inserted into the recesses 125a, 125b formed on the upper surface of the spacer 12 in the middle stage. Therefore, the deviation amount ΔX2 is the deviation amount ΔX2 between the convex portions 128a and 128b and the concave portions 125a and The size is limited by the clearance between the spacer 1 and the spacer 125b. The same applies to the relationship between the heat sink portion 20b and the spacer 12 in the lower stage, and the amount of deviation ΔX4 is limited in the same way as the amount of deviation ΔX2. In this regard, the convex parts 129a and 129b formed on the back surface of the spacer 12 and the spacer 12a and the spacer 12b are inserted into the spacer 12. The size of the gap is determined by the clearance between the through holes 200a and 200b of the heat transfer plate 20. is limited to

[0046] In this embodiment, the battery cell 10 to which the spacer 12 is attached and the heat transfer plate 20 The step of correcting the misalignment of the side walls 13 and the pressure plate 1 shown in FIG. This is performed before welding the side surfaces of the battery cells 10, 14a, and 14b. and the plurality of heat transfer plates 20 are pressed by the upper and lower pressing plates 14a, 14b. This is performed when the adhesive that bonds the cell bodies 100 together and the heat absorbing portion 20a to each other is not yet cured. The alignment correction is performed by using the positioning jig T1 and the pressing jig T2. do.

[0047] First, the positioning jig T1 is attached to each spacer 12 as shown in FIGS. Located in the space S1 on the front side (the X-axis negative direction side) of the protrusions 127a and 127b. The jig T1 is placed so as to extend in the stacking direction (Z direction), and all the stacked parts are The spacer 12 is disposed so as to penetrate the space S1. The jig T1 is attached to the front surface 270 of the projections 127a and 127b of the spacer 12 in the middle stage. Although the electrodes are placed in close contact with each other, they may be placed with a gap therebetween.

[0048] Next, the pressing tool T2 is pressed against the rear side (the side in the positive direction of the X-axis) of the upper heat dissipation portion 20b. 260 and urged in the negative direction of the X-axis. 0 and the cell body 100, and between the cell bodies 100 and 100. The adhesive is uncured, so by applying pressure to the pressing tool T2 in the negative X-axis direction, the heat transfer The plate 20 can be moved in the negative direction of the X-axis. When the heat transfer plate 20 is moved, the battery cells 10 above and below the heat transfer plate 20 are also heated by the adhesive force. As a result, there is a possibility that the heat transfer plate 20 will move in the negative direction of the X axis as if it is being dragged by the heat transfer plate 20. In the case of the arrangement of FIG. 11(b), the middle battery cell 10 is connected to the protrusions 127a and 127b of the spacer 12. 7b is in contact with the positioning jig T1 and cannot be moved, but the upper battery cell 10 For the sake of simplicity, the force F of the pressing tool T2 is Therefore, the case where only the upper heat transfer plate 20 moves will be described as an example.

[0049] When the upper heat transfer plate 20 moves in the negative direction of the X-axis due to the biasing force of the pressing jig T2, The deviation amount ΔX1 becomes smaller according to the amount of movement. Then, as shown in Figs. 12(a) and 12(b), When the heat dissipation portion 20b comes into contact with the contact surface 260 of the upper spacer 12, the deviation amount ΔX1 becomes zero. Even after the heat dissipation portion 20b of the upper heat transfer plate 20 comes into contact with the contact surface 260, the biasing force is further applied. As F continues to be applied, the upper heat transfer plate 20 and the upper battery cell 10 become one body with the X-axis negative. The pressing jig T2 moves in the direction of the arrow B, and the pressing jig T2 comes into contact with the heat dissipation portion 20b of the lower heat transfer plate 20. When the force F is continued to be applied, the upper heat transfer plate 20, the upper battery cell 10, and the lower heat transfer plate 20 moves in the negative direction of the X-axis, and the heat dissipation portion 20b of the lower heat transfer plate 20 moves toward the lower space. When the contact surface 260 of the sensor 12 comes into contact with the contact surface 260, the deviation amount ΔX3 becomes zero.

[0050] Then, when the biasing force F is further applied, the upper heat transfer plate 20 and the upper battery cell 10 , the lower heat transfer plate 20 and the lower battery cell 10 move together in the negative direction of the X-axis, The surfaces 270 of the projections 127a and 127b of the upper and lower spacers 12 come into contact with the jig T1. As a result, the upper, middle and lower battery cells 10 and the upper and lower heat transfer plates 2 The arrangement of 0s is as shown in Figures 13(a) and 13(b).

[0051] In this manner, the spaces attached to the upper, middle and lower battery cells 10 are The surfaces 270 of the projections 127a and 127b of the spacer 12 come into contact with the positioning jig T1, so that the X-direction position is aligned with high precision. 2. Therefore, the heat dissipation portions 20b are positioned so as to abut against the heat transfer plate abutment portions 126 of the heat dissipation portions 20b in the X direction. The position is precisely aligned.

[0052] 11 to 13, the battery cells 10 are arranged in three rows, upper, middle and lower, as an example. The correction of the misalignment of the spacers 12 and the heat transfer plates 20 is carried out by stacking a plurality of spacers. This is performed simultaneously for all of the sensors 12 and the heat transfer plates 20. The heat dissipation portion 20b of the spacer 12 is in contact with the heat transfer plate contact portion 126 of the spacer 12 that is aligned in the X direction. Thus, the heat dissipation portion 20b is reliably positioned with high precision in the X direction. This causes the contact pressure between each heat dissipation portion 20b and the heat conductive sheet 23 to vary, and some This can prevent the heat dissipation portion 20b from becoming insufficiently in contact with the heat dissipation portion 20b. Therefore, the heat dissipation performance from the heat source 21 to the cooling plate 21 can be improved.

[0053] On the other hand, in the battery module described in Patent Document 1, a heat transfer plate is placed on the cell holder before stacking the cell holder. The second portion of the plate is positioned against the side wall of the cell holder, and then the heat transfer plate is The cell holders, each equipped with a port, are stacked together. When stacking the cells, there is a risk of the cell holders becoming misaligned, and multiple heat transfer plates may be used. The position of the second portion of the connector is likely to be misaligned with respect to the opposing heat conductive member.

[0054] In addition, when the heat dissipation portion 20b is configured to abut against the heat transfer plate abutment portion 126 of the spacer 12, It is not necessary to bring the entire area of ​​the heat dissipation portion 20b in the Y direction into contact with the spacer 12. In the illustrated example, the heat dissipation portion 20b has a structure in which both end regions in the Y direction are in contact with the spacer 12. For example, see FIG. 11(a). The spacer 12 has a heat transfer plate contact portion 126 which is a heat dissipating portion. The shape of the protruding portion 20b is such that the space The amount of resin material is reduced, and the mass and cost of the spacer 12 can be reduced.

[0055] FIG. 14 is a diagram for explaining the bending angle of the heat transfer plate 20. The heat dissipation portion 20b of the heat transfer plate 20 is In order to ensure a sufficient heat dissipation area, the upper end of the heat dissipation portion 20b is located at a Z-position higher than the upper end of the spacer 12. Therefore, when stacking the battery cells 10, To prevent the upper spacer 12 from interfering with the upper end of the heat dissipation portion 20b and reducing workability, The angle θ between the heat sink 20a and the heat dissipation portion 20b is set to 90°+α (α is approximately greater than 1° and less than 10°). This reduces interference between the spacer 12 and the heat dissipation portion 20b, thereby improving productivity. Of course, although there is a drawback in that the assembly workability is poor, θ=90 deg may also be acceptable.

[0056] In addition, the lower end of the heat transfer plate contact portion 126, that is, the connection area between the heat absorption portion 20a and the heat dissipation portion 20b A tapered surface 261 may be formed at a position opposite to the region 201. When the upper end of the heat dissipation portion 20b abuts against the tapered surface 261 of the upper spacer 12, the heat dissipation portion 20b The angle becomes larger, and the spacer 12 is subjected to a force in the negative X direction. In order to prevent the deterioration of workability due to the interference between the tip of the heat dissipation portion 20b and the spacer 12, In addition, both the configuration in which the angle θ is set to 90 deg+α and the configuration in which the tapered surface 261 is formed on the spacer 12 may be applied, or only one of them may be applied. That's fine too.

[0057] 14, when the angle θ of the heat dissipation portion 20b is set to 90 deg+α, when the pressing jig T2 is removed from the state shown in FIGS. 13(a) and 13(b), the heat dissipation portion 20b returns from the state (θ=90 deg) in which it abuts against the abutment surface 260 of the spacer 12 to a state of θ=90 deg+α. However, even in this case, at least a part of the heat transfer plate abutment portion 126 (for example, the lower end portion of the abutment surface 260) abuts against the heat dissipation portion 20b, and the positioning of the heat dissipation portion 20b with respect to the spacer 12 is performed by the heat transfer plate abutment portion 126.

[0058] Next, a manufacturing method (manufacturing process) of the battery module 1 will be described with reference to FIGS. The manufacturing process of the battery module 1 generally includes the steps of: The first step is to laminate the laminated members, the second step is to align the positions of the heat dissipation portions 20b of the heat transfer plates 20, and the third step is to laminate the laminated members. A process of welding the side wall plate 13 while compressing the structure formed by stacking the members; 0A, 150B), and a process of welding the busbar module 15, the terminal 17 and The lamination process includes a process of attaching the resin cover 18, etc. The mounting table 70 is provided with four locating pins 71. During lamination, the through holes 113a, 124a of the spacers 11, 12 and the pressure plates 14a, 14 The locating pin 71 is inserted into the through hole 140 of b.

[0059] In the first step shown in FIG. 15, ten battery cells 10, four heat transfer plates 20, and a heating element 21 are assembled. The pressure plates 14a and 14b are stacked. Spacers 11 and 12 are attached to each battery cell 10. Specifically, as shown in FIG. 3, the pressure plate 14b, the first layer A third stage battery cell 10, a second stage battery cell 10, and a heat transfer plate 20 are provided. A re-cell 10, a fourth-stage battery cell 10, and a fifth-stage battery cell provided with a heat transfer plate 20 10, a sixth-stage battery cell 10, a seventh-stage battery cell 10 provided with a heat transfer plate 20, The eighth battery cell 10, the ninth battery cell 10 provided with the heat transfer plate 20, and the tenth battery cell The second battery cell 10 and the pressure plate 14b are stacked in this order. The heat transfer plate 20 is adhered to the adhesive 500. The battery cell 10 is attached to the back surface of the cell body 100 by this.

[0060] In addition, when stacking the battery cells 10, one surface of the cell bodies 100 to be bonded, An adhesive 500 is applied to one surface of the cell body 100 and the heat transfer plate 20 to be bonded. The agent 500 is, for example, a two-liquid reactive acrylic anaerobic resin, and is left for a predetermined time after application. The second step described below is performed before the adhesive 500 hardens (after a predetermined time has elapsed). The adhesive 500 has viscoelasticity even after hardening and is a gel. It is preferable to use an adhesive that maintains its adhesiveness, and that does not come off when the cell body 100 expands. In the third step described later, the stacked structure is Pressure is applied in the stacking direction. This causes the battery cells 10 to The adhesive 500 spreads over a wide area between the hot plate 20, and the adhesive surface area becomes large. In this manner, the battery cells 10 are bonded to each other and to the heat transfer plate 20 via the adhesive 500. The heat of the cell body 100 is transferred to the heat transfer plate 20 via the adhesive 500. .

[0061] In the second step shown in FIG. 16, a plurality of layers are laminated together before the adhesive 500 hardens. The position of the heat dissipation portion 20b of the heat transfer plate 20 and the positions of the spacers 12 of the plurality of battery cells 10 The following description will be given with reference to FIGS. 11 to 13. First, the spacers 12 are formed The rear side (left side in the figure) of the protrusion 127b is provided with a surface 270 of each protrusion 127b. Similarly, the positioning jig T1 is disposed on the rear side of each of the projections 127a on the opposite side in the Y direction (see FIG. On the left side, another positioning jig T1 is placed so as to face the surface 270 of each protrusion 127a. In this manner, a pair of positioning jigs T1 are disposed on the rear side of each of the projections 127a and 127b. (See Figure 11.)

[0062] Next, the pressing tool T2 is pressed against the heat dissipation portion 20b of each heat transfer plate 20 in the negative X-axis direction. The force F is applied to the casing. The casing is displaced as shown in Figs. The battery cells 10 and the heat transfer plate 20 move in the negative direction of the X-axis. The projections 127a and 127b of the spacer 12 of the battery cell 10 come into contact with the positioning jig T1. As a result, the X-direction positions of the heat transfer plate contact portions 126 with which the heat dissipation portions 20b come into contact are aligned, In this way, the pressing operation by the pressing jig T2 in the stacked state causes the spacers 12 (i.e., the battery cells 10) to be aligned in the X direction. In addition, the heat dissipation portions 20b can be aligned at the same time. When the misalignment in the X direction between the projections 127a and 127b is small, as described above, The heat dissipation portions 20b can be aligned with each other without being pressed until b abuts against the positioning jig T1. It is possible to combine them.

[0063] In the third step shown in FIG. 17, the laminated structure is pressed in the lamination direction by a pressing plate 14a. The side wall plate 13 is welded to the side surfaces of the battery cells 10, 14b. The uncured adhesive 500 disposed between the Terricel 10 and the heat transfer plate 20 is As shown in FIG. 16, the upper surface of the pressing plate 14a is pressed by a pressing jig T3. When pressure is applied in the negative Z direction, the laminated portion 112 of each spacer 11 on the front side (see FIG. 5) The upper surface of each spacer 11 on the rear side is in close contact with the lower surface of the spacer 11 on the upper side. The upper surface of the laminated portion 123 (see FIG. 5) of the spacer 12 is in close contact with the lower surface of the spacer 12 located above it. In the pressurized state, the side walls 14a and 14b are provided on both sides of the pressurizing plates 14a and 14b in the Y direction. 13 are joined to each other by laser welding or the like.

[0064] In the fourth step shown in FIG. 18, the positive electrode tabs 101 and the negative electrode tabs 102 of the stacked battery cells 10 are The busbars 150 (150A, 150B) are welded to the electrode tabs 102 to form a corresponding battery cell FIG. 18 shows an example of a connection form using a bus bar. This shows an example of a connection in which 5 battery cells are connected in series and 2 in parallel. 1 shows a battery cell 10, with the third and fourth rows, the fifth and sixth rows, and the seventh and eighth rows. The first and second stages are connected in parallel, and the third and fourth stages and the fifth and sixth stages are connected in series. The fifth and sixth stages are connected in series with the seventh and eighth stages.

[0065] In FIG. 18, the positive electrode tab 101 of the battery cell 10 is shown hatched. The battery cells 10 in the third and seventh to eighth rows are provided with a positive electrode tab 101 on the left side in the figure. The negative electrode tab 102 is provided on the right side of the figure. A positive electrode tab 101 is provided on the right side of the figure, and a negative electrode tab 102 is provided on the left side of the figure. In FIG. 18, the fifth and sixth battery cells 10 are connected to the third and fourth battery cells 10. The bus bar is indicated by the reference symbol 150A, and the battery cells 10 in the 5th and 6th rows and the battery cells 10 in the 7th and 8th rows are indicated by the reference symbol 150A. The bus bar connecting the cells 10 is indicated by the reference symbol 150B. A pair of connection parts 151 connected to the positive electrode tab 101 and the negative electrode tab 102 of the tericell 10 In FIG. 18, the connection portion 151 connected to the positive electrode tab 101 is hatched. It was shown.

[0066] Of the pair of connecting portions 151 of bus bar 150A, one connecting portion 151 shown in hatching is The positive electrode tabs 101 of the battery cells 10 in the fifth and sixth rows are connected to each other, and the other connection portion 151 is The negative electrodes of the third and fourth battery cells 10 arranged below the fifth and sixth battery cells 10 The bus bar 150B is connected to the pole tab 102. One of the connection parts 151 on which the wires are applied is connected to each of the positive electrode tabs 101 of the battery cells 10 in the seventh and eighth rows. The other connection portion 151 is connected to each negative electrode tab 102 of the battery cells 10 in the fifth and sixth rows. As a result, the battery cells 10 in the third and fourth stages are connected to each other, and the battery cells 10 in the fifth and sixth stages are connected to each other. The battery cells 10 in the seventh and eighth stages are connected in parallel, The third and fourth battery cells 10, the fifth and sixth battery cells 10, and the seventh and eighth battery cells 10 are The battery cells 10 are connected in series in sequence.

[0067] In addition, in FIG. 18, the battery cells 10 in the first and second rows and the battery cells 10 in the ninth and tenth rows Although not shown in the figure, the battery cells 10 in the first and second rows and the ninth and tenth rows are As with the battery cell 10, a positive electrode tab 101 is provided on the right side of the figure, and a negative electrode tab 102 is provided on the left side of the figure. 02 are provided. The negative electrode tabs 102 of the battery cells 10 in the first and second stages are connected to the positive electrode tabs 101 of the battery cells 10 in the third and fourth stages by bus bars 150. The positive electrode tabs 101 of the battery cells 10 in the ninth and tenth stages are connected to the negative electrode tabs 102 of the battery cells 10 in the seventh and eighth stages by bus bars 150. Furthermore, although not shown in the drawings, a bus bar is provided to connect the pair of positive electrode tabs 101 of the battery cells 10 in the first and second stages, and a bus bar is provided to connect the pair of negative electrode tabs 102 of the battery cells 10 in the ninth and tenth stages. As a result, the five pairs of battery cells 10 connected in parallel are connected in series.

[0068] Next, in the fifth step, as shown in FIG. 2, the laminated sheets are connected to a bus bar (not shown). A busbar module 15 is attached to the front side of the battery cell 10. A terminal 17 is provided on the front side of the module 15. A pair of terminal covers 19 are provided on the front side of the terminal 17, and a resin cover is provided on the front side of the terminal 17. The bar 18 is then attached. As a result, the battery module 1 shown in FIG.

[0069] In the manufacturing process of the battery module 1 described above, a locating pin as shown in FIG. A mounting table 70 is provided with a locating pin 71. The locating pin 71 is used to stack the battery cells 10. This is provided to roughly determine the position when stacking the batteries. The cell 10 is roughly positioned by the projections 128a and 128b and the recesses 125a and 125b shown in FIG. 25b, the locating pin 71 may be omitted.

[0070] (Modification) (a) The cell was explained as a flat laminated cell, but it is now a cubic rectangular cell. In this modification, the present invention can be applied to a rectangular cell having an abutment surface 260 on one end of the exterior member. A surface 270 and a heat transfer plate abutment portion 126 are provided. (b) The shape of the spacer 12 is also such that it has a contact surface 260, a surface 270, and a heat transfer plate contact portion 126. The spacer may have any shape as long as it is compatible with the spacer.

[0071] The effects of the above-described embodiment will now be described. (1) The battery module of the embodiment includes a plurality of stacked battery cells 10 and a battery The spacer 12 is provided at the end of the battery cell 10, and the battery cells 10 are stacked. A heat absorbing portion 20a is disposed between the battery cells 10 and absorbs heat from the battery cells 10. and a heat transfer plate 20 having a heat dissipation portion 20b that dissipates the absorbed heat to the outside. b is bent with respect to the heat absorbing portion 20a and is exposed between the battery cells 10 and serves as a spacer The spacer 12 is a heat transfer plate having a contact surface 260 that contacts the heat dissipation portion 20b. The abutment portion 126 and a surface 270 that faces the opposite direction to the abutment surface 260 and determines the position of the spacer 12 and a protrusion 127a which is a positioning portion having the protrusion 127a.

[0072] According to the battery module of the embodiment, the spacer 12 has a heat sink portion 20b. The contact surface 260 is provided with a positioning surface 270 facing in the opposite direction to the contact surface 260. For this reason, a positioning jig is attached to each surface 270 of the spacer 12 of the stacked battery cells 10. By abutting T1, the position of the battery cell 10 can be regulated. In a state where the position of the battery cell 10 is regulated by the fixing jig T1, the standing of the heat dissipation portion 20b The heat transfer plate 20 is moved toward the positioning jig T1 by contacting the pressing jig T2 with the outer surface of the rising wall. In this way, the spacer 12 has two surfaces 260 facing in opposite directions. and 270, and these surfaces 260, 270 are used to connect the heat transfer plate 20 to the spacer 12. The positions of the discharge currents can be aligned with respect to all the battery cells 10. The heat dissipation portion 20b can be positioned so as to be aligned on approximately the same plane. The heat dissipation performance from 20b to the cooling plate 21 can be improved.

[0073] (2) In the battery module of (1) above, the heat absorbing portion 20a has a through hole (hole) 200. a, 200b are formed, and the spacer 12 protrudes toward the heat absorbing portion 20a and has through holes The connector is provided with protrusions 129a and 129b that are inserted into the holes 200a and 200b with a gap therebetween. For example, as shown in FIG. 8, between the protrusions 129a, 129b and the through holes 200a, 200b By setting the dimensions A, B, and D as A>B>D so that a gap is created between the two parts in Figure 9, While minimizing the rotational deviation of the heat transfer plate 20 as shown by the dashed line, the cell body of the battery cell 10 The heat transfer plate 20 can be roughly positioned relative to 100 with ease.

[0074] (3) In the battery module described in (1) or (2) above, the heat absorbing portion 20a is The battery cell 10 is bonded with an adhesive 500. After the adhesive hardens, the heat absorbing portion 20 Since the heat absorbing portion 20a is in close contact with the cell body 100 without any misalignment, the heat absorbing portion 20a and the cell body 1 00.

[0075] (4) The battery module according to any one of (1) to (3), The spacer 12 is attached to a portion of the substrate 10 facing a connection area 201 between the heat absorbing portion 20a and the heat radiating portion 20b. As a result, when the battery cells 10 are stacked, the heat dissipation portion 20b Even if the tip of the heat sink 20b interferes with the tapered surface 261, the angle θ of the heat sink 20b changes to a larger angle. This prevents deterioration of stacking workability.

[0076] (5) The battery module according to any one of (1) to (4), The angle θ (see FIG. 14) between the heat absorbing portion 20a and the heat radiating portion 20b is greater than 90 degrees. The angle θ is set to be smaller than 100 degrees. In order to reduce interference between the spacer 12 and the heat dissipation portion 20b during stacking of the battery cells 10, This makes it possible to improve productivity.

[0077] (6) The battery module according to any one of (1) to (5), The spacer 12 has an upper surface (first end surface) 123a on the upper layer side in the stacking direction and a lower surface on the lower layer side in the stacking direction. (Second end surface) 123b is formed, and the interval between the upper surface 123a and the lower surface 123b is The spacer 12 further includes a stacking portion 123 set to a battery cell stacking thickness h. The upper surface 123a of the spacer 12 is in contact with the lower surface 123b of the spacer 12 on the upper layer side, and the lower surface 123b of the spacer 12 on the lower layer side is in contact with the lower surface 123b of the spacer 12 on the upper layer side. Therefore, the battery cells 10 and the spacer 12 are in contact with each other. The height dimension of the laminate of the plurality of heat transfer plates 20, i.e., the height dimension of the battery module 1, is The thickness and number of the heat transfer plates 20 are constant, and the height of the battery module 1 is suppressed. It is possible to do so.

[0078] (7) In the battery module described in (6) above, the second spacer 12 on the upper layer side In a state where the end surface 123b is in contact with the first end surface 123a of the lower spacer 12, A space in which the heat transfer plate 20 is disposed is formed between the upper and lower spacers of the battery module. The heat transfer plate 20 can be exposed to the outside of the laminate without interfering with the laminated portion 123. do.

[0079] (8) The battery device according to the embodiment is any one of the above items (1) to (7). A battery module 1 and each of a plurality of heat transfer plates 20 provided in the battery module 1 The heat dissipation member 20b is pressed against the heat dissipation member 20b via the heat conductive sheet 23, and absorbs heat from the heat dissipation member 20b. As a result, the heat of the multiple heat transfer plates 20 is efficiently dissipated through the cooling plate 21. The heat is transmitted to the outlet 21, thereby enabling the battery module 1 to be cooled effectively.

[0080] (9) The manufacturing method of the battery module according to the embodiment includes stacking a plurality of battery cells 1 0, a plurality of heat transfer plates 20 disposed between the stacked battery cells 10, and the battery cell The heat transfer plate 20 is provided with a spacer 12 provided at the end of the stacked battery cells 10. and a heat dissipation portion 20b that is exposed to the outside of the stacked battery cells 10 and faces the spacer 12. The method further comprises stacking a plurality of the battery cells 10 and a plurality of the heat transfer plates 20. After the first step, the plurality of heat dissipation parts 20b are collectively pressed by a pressing tool T2. Press the heat sink 20b toward the spacer 12 so that each of the heat sinks 20b contacts the spacer 12. The positions of the spacers 12 and the heat dissipation portions 20b are aligned. The method includes the steps of:

[0081] In the second step, the plurality of heat dissipation parts 20b are collectively pressed toward the spacer 12 by the pressing tool T2. The heat sink 20b is pressed against the spacer 12 in the opposite direction. The pressure aligns the positions of the spacers 12 that the heat dissipation portions 20b are in contact with. As a result, the positions of the heat dissipation portions 20b are aligned with each other. The surface pressure of each heat dissipation portion 20b can be made uniform, and the variation in the heat dissipation performance of the plurality of battery cells 10 can be eliminated. This can suppress the deterioration of the battery module 1 and improve the heat dissipation performance of the battery module 1.

[0082] (10) In the manufacturing method of the battery module described in (9) above, the spacer 12 is A first contact surface 260 against which the heat dissipation portion 20b comes into contact, and a surface orientation with respect to the first contact surface 260 and a second surface 270 having an inverse orientation. The positioning jig T1 is disposed so as to face the second surface 270 of the second The heat is released by the pressing tool T2 until each of the second surfaces 270 comes into contact with the positioning tool T1. The portion 20b is pressed toward the spacer 12. In this manner, the stacking is performed by using the positioning jig T1. By aligning the positions of the spacers 12, the heat dissipation portion 20b can be aligned with higher accuracy. It can be done.

[0083] (11) In the method for manufacturing a battery module according to the above (9) or (10), In step 1, the battery cells 10 and the heat transfer plates 20 are hardened after a predetermined time has elapsed. The first step is performed before the adhesive 500 hardens. Therefore, the positions of the spacers 12 and the positions of the heat dissipation portions 20b are aligned. After alignment, the adhesive 500 hardens, and the spacers 502 are The positions of 12 and heat dissipation portion 20b are maintained in an aligned state.

[0084] Although various embodiments and modifications have been described above, the present invention is not limited to these. Other embodiments that are conceivable within the scope of the technical concept of the present invention are also included in the present invention. Included in the range. [Explanation of symbols]

[0085] 1... battery module, 10... battery cell, 11, 12... spacer, 13... side wall plate , 14a, 14b...pressure plate, 15...busbar module, 150, 150A, 150B...busbar Subaru, 17... terminal, 18... resin cover, 19... terminal cover, 20... heat transfer plate, 20a... heat absorbing portion, 20b... heat radiating portion, 21... cooling plate, 23... thermally conductive sheet, 100... Cell body, 101... positive electrode tab, 102... negative electrode tab, 112, 123... stacked portion, 123a... Upper surface, 123b...lower surface, 126...heat exchanger plate contact part, 125a, 125b...recessed part, 127a, 127b...protrusion, 128a, 128b, 129a, 129b...protrusion, 200a, 200b ...through hole, 201...connection region, 270...surface, 260...contact surface, 261...tapered surface, 400 ...battery device, 500...adhesive, T1...positioning jig, T2...pressing jig, T3...pressing jig Ingredients

Claims

1. A plurality of stacked battery cells; A spacer provided at least at ends of the plurality of battery cells; A heat transfer plate having a heat absorption portion and a heat dissipation portion disposed between the stacked battery cells, the heat absorption portion having a locking portion that is locked to the spacer so that the heat transfer plate is movable relative to the spacer; Equipped with The spacer and the heat dissipation portion of the heat transfer plate are in contact with each other. Battery module.

2. The battery module according to claim 1 ; a cooling member that is pressed against each heat dissipation portion of a plurality of heat transfer plates provided in the battery module via a thermally conductive sheet and absorbs heat from the heat dissipation portion.

Images