JP2017054766A - Manufacturing method of battery module and manufacturing method of battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a battery module capable of suppressing a flow of a heat conductive material even when a liquid heat conductive material is used and improving productivity, and a manufacturing method of a battery pack.SOLUTION: A manufacturing method of a battery module 20, which is fixed to a casing 11 with a solid heat conductive member 27 formed by curing a liquid thermally conductive material sandwiched therebetween and arranges a plurality of battery cells 21 in one direction includes: a step of applying a heat conductive material on an opposing surface facing the casing 11 of the cells 21; and a step of self-discharging the battery cells 21. In the step of self-discharging the battery cells 21, the heat conductive material is cured.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a battery module manufacturing method and a battery pack manufacturing method.

  Conventionally, a battery module in which a plurality of battery cells such as lithium ion secondary batteries are arranged in one direction is known. A battery pack in which such a battery module is fixed to a casing (case) is provided with a heat dissipation structure for releasing heat generated in the battery cells to the casing. For example, the battery module described in Patent Document 1 has a heat transfer plate joined to a case, and a heat conductive layer is provided on a surface facing the case of the heat transfer plate. In the battery pack having this battery module, heat generated in the battery cells is conducted to the case through the heat transfer plate and the heat conductive layer.

JP, 2014-116193, A

  The heat conductive layer described in Patent Document 1 is formed by curing a curable liquid heat conductive material (TIM: Thermal Interface Material). When a liquid heat conductive material is used in this way, it has fluidity until the heat conductive material is cured, and thus the case may flow out of the region other than the region facing the facing surface. In this case, for example, screw holes or the like provided around the region in the case may be filled with the heat conductive material, and it may be difficult to attach the battery module to the case. In addition, for example, when a liquid heat conductive material is cured at room temperature, a period of about half a day to one day is required. For this reason, improvement of the productivity of a battery module is desired.

  The present invention provides a method of manufacturing a battery module and a method of manufacturing a battery pack that can suppress the flow of the heat conductive material and improve productivity even when a liquid heat conductive material is used.

  A method for manufacturing a battery module according to an aspect of the present invention includes a solid heat conductive member formed by curing a liquid heat conductive material and fixed to a housing, and a plurality of battery cells are arranged in one direction. A method for manufacturing a battery module comprising: a step of applying a heat conductive material on a facing surface facing a housing of a battery cell; and a step of self-discharging the battery cell, wherein the battery cell self-discharges. The heat conductive material is cured.

  According to this manufacturing method, the liquid heat conductive material applied on the facing surface facing the casing of the battery cell is cured in the step of self-discharge of the battery cell. As a result, when the battery module is fixed to the housing with the solid heat conducting member formed by curing the heat conducting material, the heat conducting material flows out of the region between the housing and the battery module. This can be suppressed. In addition, the period required for the self-discharge of the battery cell tends to be longer than the period required for curing the liquid heat conductive material. Therefore, by curing the liquid heat conductive material during the self-discharge of the battery cell, at least a part of the period required for curing the heat conductive material can be overlapped with the period during which the battery cell self-discharges. Therefore, the productivity of the battery module can be improved.

  The step of applying the heat conductive material may be performed before the step of self-discharging the battery cell. Moreover, the process of apply | coating a heat conductive material may be performed during the self-discharge of a battery cell. The productivity of the battery module can be improved by applying the heat conductive material on the opposite surface before the step of self-discharging the battery cell. In addition, when the heat conductive material is applied during the self-discharge of the battery cell, the step of applying the heat conductive material and the step of self-discharge of the battery cell can be performed in parallel, so that the productivity of the battery module can be further improved.

  In the step of applying the heat conductive material, the heat conductive material may be applied with the opposite surface of the battery module facing upward. In this case, for example, compared with the case where the facing surface is directed sideways or downward, it is possible to suppress the heat conducting material from flowing out of a predetermined region on the facing surface during the curing of the heat conducting material. In addition, since the heat conductive material can be easily flattened before the heat conductive material is cured, the flatness of the heat conductive member can be improved. Thereby, since the compression rate of the heat conducting member when the battery module is fixed to the casing is made uniform, the reaction force of the heat conducting member to the battery module can be made uniform.

  In one direction, a plurality of heat transfer plates arranged alternately with a plurality of battery cells are provided, and the heat transfer plates are in contact with a main surface that is a surface intersecting in one direction in the battery cells, In the step of applying the heat conductive material, the heat conductive material is applied onto the second main body of the heat transfer plate. May be. In this case, a heat conducting member is formed on the second main body portion of the heat transfer plate for conducting heat generated in the battery cell. Therefore, the heat generated in the battery cell can be conducted to the heat conducting member via the heat transfer plate, and the heat dissipation of the battery cell can be improved.

  The manufacturing method of the battery pack which concerns on the other side surface of this invention is equipped with the process of fixing the said battery module so that a heat conductive member may contact | connect a housing | casing after the process of making a battery cell self-discharge.

  According to this manufacturing method, since the battery module is fixed so that the solid heat conductive member formed by curing the liquid heat conductive material is in contact with the housing, it is possible to suppress the flow of the heat conductive material. .

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where a liquid heat conductive material is used, the manufacturing method of a battery module and the manufacturing method of a battery pack which can improve the productivity while suppressing the flow of the said heat conductive material can be provided.

Drawing 1 is a schematic diagram of a battery pack provided with a battery module concerning an embodiment. FIG. 2 is a perspective view of the battery module fixed to the battery pack of the embodiment. FIG. 3 is an end view taken along line III-III in FIG. FIG. 4 is a perspective view showing a battery cell. FIG. 5 is a process diagram for explaining the battery pack manufacturing method according to the present embodiment. 6A to 6C are diagrams for explaining the fourth step.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted.

  Drawing 1 is a schematic diagram of a battery pack provided with a battery module concerning an embodiment. As shown in FIG. 1, the battery pack 10 includes a housing 11, a junction box 12, and a plurality of battery modules 20.

  The casing 11 has a box shape and has a storage space for storing the junction box 12 and the plurality of battery modules 20. The casing 11 includes a square plate-like bottom plate 11a, a top plate 11b provided to face the bottom plate 11a, a plate-shaped front plate 11c, a rear plate 11d, and a pair of side plates 11e provided upright from the periphery of the bottom plate 11a. And having. When mounted on a vehicle such as a forklift or an automobile, the housing 11 is disposed such that the bottom plate 11a is positioned vertically downward and the top plate 11b is positioned vertically upward. FIG. 1 illustrates a state where one side plate 11e is removed. The other side plate 11e is provided with a plurality of holes 11f, and the junction box 12 and the battery module 20 are attached to the other side plate 11e using these holes 11f. The plurality of holes 11f may be through holes or screw holes. The size of the plurality of holes 11f varies depending on the location of the other side plate 11e.

  Hereinafter, in the housing 11, the direction in which the top plate 11b is provided is “up”, the direction in which the bottom plate 11a is provided is “down”, the direction in which the front plate 11c is provided is “front”, and the direction in which the rear plate 11d is provided. Is described as “after”. Further, the direction from the bottom plate 11a to the top plate 11b or the direction from the top plate 11b to the bottom plate 11a is referred to as “direction X being the vertical direction”, and the direction from the front plate 11c to the rear plate 11d or from the rear plate 11d to the front plate 11c. The direction toward the front side is referred to as “direction Y that is the front-rear direction”, and the direction from one side plate 11e toward the other side plate 11e or the direction from the other side plate 11e toward one side plate 11e is referred to as “direction Z that is the lateral direction”. I do.

  The junction box 12 is provided in a corner portion formed by the top plate 11b and the front plate 11c in the accommodation space. The junction box 12 accommodates a terminal block 12a, a relay (not shown), and the like. The terminal block 12a includes a plurality of connecting portions (not shown) to which cable terminals and the like are connected. The junction box 12 is connected to the battery module 20 via cables C1 to C3 and the like.

  The plurality of battery modules 20 are arranged in the direction X at the rear of the accommodation space, and are arranged in the direction X at the front of the accommodation space. In the present embodiment, the number of battery modules 20 in the accommodation space is five. The number of battery modules 20 arranged behind the housing space is three, and the number of battery modules 20 arranged forward is two. A junction box 12 is provided above the battery module 20 disposed in front.

  FIG. 2 is a perspective view of the battery module fixed to the battery pack. FIG. 3 is an end view taken along line III-III in FIG. As shown in FIGS. 2 and 3, the battery module 20 includes a plurality of battery cells 21 arranged in the direction Y, a plurality of heat transfer plates 22, a first bracket (first plate) 23, Two brackets (second plate) 24, an elastic member 25, a control device 26, and a heat conducting member 27 are provided. The battery module 20 of the present embodiment includes seven battery cells 21.

  FIG. 4 is a perspective view showing a battery cell. As FIG. 4 shows, the battery cell 21 is secondary batteries, such as a lithium ion battery or a nickel hydride storage battery, for example. The battery cell 21 has a substantially rectangular parallelepiped shape, and has a pair of main surfaces 21a that are rectangular surfaces that intersect the direction Y, and four side surfaces 21b that are rectangular surfaces. The battery cell 21 has a first terminal T1 and a second terminal T2 to be connected to an external device or another battery cell 21. As shown in FIGS. 2 and 3, each of the plurality of battery cells 21 is held by a resin cell holder 31. The cell holder 31 exposes at least a part of the main surface 21 a of the battery cell 21 and surrounds and holds the side surface 21 b of the battery cell 21.

  As shown in FIG. 3, the heat transfer plate 22 is a member arranged alternately with the plurality of battery cells 21 in the direction Y. The heat transfer plate 22 is a member having an L-shaped cross section that is in contact with the main surface 21a of the battery cell 21 exposed from the cell holder 31, and conducts heat generated in the battery cell 21 to the outside. It is a member for adjusting the temperature. The heat transfer plate 22 is a plate member made of metal or alloy having high thermal conductivity. The heat transfer plate 22 includes a first main body portion 22a that contacts the main surface 21a, and a second main body portion 22b that extends in one direction Y from one end of the first main body portion 22a. As shown in FIG. 3, the first main body portion 22 a contacts both the battery cells 21 adjacent in the direction Y, and is arranged so as to reduce the temperature difference between the battery cells 21. The second main body portion 22 b contacts the side surface of the cell holder 31 and is exposed from the cell holder 31. In the present embodiment, the second main body portion 22 b extends along the side surface 21 b on the other side plate 11 e side in the battery cell 21. Therefore, the one end of the first main body portion 22a corresponds to the end on the other side plate 11e side of the first main body portion 22a. The second main body portions 22b may be in contact with each other or may be separated from each other.

  The first bracket 23 and the second bracket 24 are made of a highly rigid material, for example, a metal such as iron. The first bracket 23 and the second bracket 24 attach a restraining load to the plurality of battery cells 21 by sandwiching the plurality of battery cells 21 from both sides in the direction Y. The first bracket 23 and the second bracket 24 also fix the battery module 20 to the housing 11 of the battery pack 10. The first bracket 23 is disposed on one side in the direction Y in the plurality of battery cells 21 arranged. The second bracket 24 is disposed on the other side in the direction Y in the plurality of battery cells 21 arranged. Each of the first bracket 23 and the second bracket 24 has a clamping part 41 and an attachment part 42.

  The clamping part 41 is a substantially rectangular flat plate. The clamping part 41 of the first bracket 23 and the clamping part 41 of the second bracket 24 are connected by a connecting member 43 such as a bolt, for example. The holding portions 41 are connected to each other by a connecting member 43 so that a force is applied so as to approach each other in the direction Y. Thereby, the clamping parts 41 apply a restraining load in the direction Y to the plurality of battery cells 21.

  The attachment portion 42 is a substantially rectangular flat plate extending from the end on the housing 11 side of the sandwiching portion 41 to the side opposite to the battery cell 21. A plurality of holes 42 a penetrating along the direction Z are provided in the attachment portion 42. The attachment portion 42 is attached to the other side plate 11e by a bolt 44 inserted through the hole 42a and screwed into the hole 11f. The surface of the attachment portion 42 that contacts the housing 11 is located closer to the housing 11 than the second main body portion 22b. The offset D1 in the direction Z between the surface and the second main body 22b is, for example, about 1 mm.

  The elastic member 25 is a plate-like member provided between the first bracket 23 and the battery cell 21 on the first bracket 23 side. The elastic member 25 is made of an elastically deformable material such as rubber and resin sponge. In general, since the battery cell 21 expands as the usage period of the battery cell 21 increases, the elastic member 25 absorbs the expansion of the battery cell 21 in the battery module 20. The surface of the attachment portion 42 that contacts the housing 11 is located closer to the housing 11 than the elastic member 25. The offset D2 in the direction Z between the surface and the elastic member 25 is a portion located between the battery cell 21 and the second main body portion 22b in the cell holder 31, the heat transfer plate 22 (second main body portion 22b), and heat conduction. The total thickness of the member 27 is substantially the same.

  The control device 26 is a device that performs various controls (for example, discharge control or temperature control) regarding the battery module 20, and is provided on the battery cell 21 and connected to the battery cell 21. The control device 26 includes a central processing unit (CPU), an electronic control unit (ECU), and the like.

  The heat conducting member 27 is a solid layer formed by curing a liquid heat conducting material (TIM). A heat conductive material is a material which has high heat conductivity, for example, for example, has a heat conductivity of 1.5 W / m * K or more. The thermal conductivity of the heat conductive material may be 2 W / m · K or more, 2.5 W / m · K, or 3.0 W / m · K or more. An example of the heat conductive material is polyurethane. The solid layer may be a layer having a certain volume and shape, and may be a gel layer. The heat conductive member 27 may have adhesiveness.

  The heat conducting member 27 is provided on the second main body portion 22 b in the battery module 20. Since the heat conduction member 27 contacts the case 11 when the battery module 20 is attached to the case 11, the heat generated in the battery cell 21 is transmitted through the heat transfer plate 22 and the heat conduction member 27. Is transmitted to. The thickness of the heat conducting member 27 is substantially the same as the offset D1. In the present embodiment, the heat conducting member 27 and the first bracket 23 are separated from each other, but the heat conducting member 27 and the first bracket 23 may be in contact with each other. In the present embodiment, the surface of the heat conducting member 27 on the side of the housing 11 is flattened, but the surface may not be flattened. In order to flatten the heat conducting member 27, for example, a flattening process such as a doctor blade method may be performed, a predetermined coating apparatus may be used, and the composition of the TIM may be adjusted.

  Next, the manufacturing method of the battery pack according to the present embodiment will be described with reference to FIGS. 5 and 6A to 6C. FIG. 5 is a process diagram for explaining the battery pack manufacturing method according to the present embodiment. 6A to 6C are diagrams for explaining the fourth step.

  As shown in FIG. 5, first, the battery cell 21 and the like are assembled (step S1). In step S <b> 1, the battery cell 21 is incorporated into the cell holder 31. Thereby, the battery cell 21 is held by the cell holder 31. Moreover, in step S1, the main surface 21a of the battery cell 21 is brought into contact with the first main body portion 22a of the heat transfer plate 22, and the surface 21b of the battery cell 21 is later on a surface (facing surface) that faces the casing 11. The 2nd main-body part 22b of the heat-transfer plate 22 is arrange | positioned.

  Next, the plurality of battery cells 21 are arranged and restrained (step S2). In step S2, the plurality of battery cells 21 incorporated in the cell holder 31 in step S1 are arranged along a direction (one direction) intersecting the main surface 21a. At this time, the first main body portion 22 a of the heat transfer plate 22 is sandwiched between the adjacent battery cells 21. After arranging the plurality of battery cells 21, the plurality of battery cells 21 arranged from both sides in one direction are sandwiched between the first bracket 23 and the second bracket 24. At this time, the elastic member 25 is disposed between the sandwiching portion 41 of the first bracket 23 and the battery cell 21 located next to the sandwiching portion 41. And the 1st bracket 23 and the 2nd bracket 24 are connected using the connection member 43, and the restraint load along one direction is added with respect to the some battery cell 21 arranged.

  Next, the self-discharge of the battery cell 21 is started (step S3). In step S3, first, the electromotive forces of the constrained battery cells 21 are each measured by a tester. Specifically, the electromotive force of the battery cell 21 is measured by connecting a tester to the first terminal T1 and the second terminal T2 of the battery cell 21. In the present embodiment, the timing at which self-discharge is started is the timing at which the measurement of the electromotive force of the battery cell 21 by the tester is completed. After the self-discharge of the battery cell 21 is started, the constrained battery cells 21 are left unattended. For example, the battery cells 21 spontaneously discharge by allowing the plurality of battery cells 21 to remain stationary in an air atmosphere and at normal temperature and pressure for 1 day or more and 5 days or less. In the present embodiment, the battery cell 21 is left for about 2.5 to 3 days.

  Next, a liquid heat conductive material (TIM) 51 is applied on the plurality of battery cells 21 (step S4). In step S4, first, as shown in FIG. 6A, the surface defined by the second main body portion 22b, that is, the confronting surface that faces the housing 11 later is constrained so as to face upward. A plurality of battery cells 21 are arranged. Next, as shown in FIG. 6B, TIM 51 is applied on the second main body portion 22b. At this time, the battery cell 21 is being self-discharged. After applying the TIM 51 so as to cover the second main body portion 22b, the TIM 51 is cured by leaving the battery cell 21 unattended. As a result, as shown in FIG. 6C, the solid heat conducting member 27 is formed on the second main body portion 22b. The TIM 51 is cured, for example, for half a day or more and two days or less. In this embodiment, the TIM 51 is left to cure for about half a day to one day. Therefore, in this embodiment, the TIM 51 is cured during the self-discharge of the battery cell 21 by adjusting the timing of performing step S3 and the timing of performing step S4. In addition, since the battery cell 21 is left stationary during the self-discharge, as shown in FIG. 6C, the heat conductive member 27 having a flat surface is easily formed.

  Next, the end of the self-discharge of the battery cell 21 is confirmed (step S5). In step S5, after leaving the battery cell 21 for the period specified in step S3 from the start of self-discharge of the battery cell 21, the electromotive force of each of the plurality of battery cells 21 is measured again by a tester. Thereby, it is confirmed that the electromotive force of the battery cell 21 is lower than a predetermined threshold value or the electromotive force is 0. If the electromotive force of the battery cell 21 is higher than a predetermined threshold, step S5 may be performed after the battery cell 21 is left again for a predetermined time.

  Next, the control device 26 and the like are attached to the plurality of battery cells 21 (step S6). In step S <b> 6, the battery cells 21 are electrically connected to each other by, for example, a bus bar, and the control device 26 is attached to be electrically connected to the battery cells 21. Thereby, the battery module 20 shown in FIG. 2 is manufactured.

  Next, the battery module 20 is fixed to the housing 11 (step S7). In step S <b> 7, the battery module 20 is fixed to the housing 11 so that the heat conducting member 27 is in contact with the housing 11. The battery module 20 is fixed to the housing 11 by a bolt 44 that is inserted through a hole 42 a provided in the first bracket 23 and the second bracket 24 and screwed into a hole 11 f provided in the housing 11. . The battery pack 10 shown in FIG. 1 is manufactured by fixing the plurality of battery modules 20 to the housing 11.

  According to the manufacturing method of the battery module 20 according to the present embodiment described above, the TIM 51 applied on the second main body portion 22b provided on the facing surface facing the casing 11 of the battery cell 21 is the battery cell 21. Hardens during self-discharge. Thereby, when the battery module 20 is fixed to the housing 11 with the solid heat conduction member 27 formed by curing the TIM 51, the TIM 51 flows out of the region between the housing 11 and the battery module 20. This can be suppressed. In addition, the period required for self-discharge of the battery cell 21 tends to be longer than the period required for curing the TIM 51. For this reason, by curing the TIM 51 during the self-discharge of the battery cell 21, at least a part of the period required for the curing of the TIM 51 is overlapped with the period during which the battery cell 21 self-discharges. Therefore, the productivity of the battery module 20 can be improved.

  And the battery pack 10 in which the said effect is show | played can be manufactured by fixing the said battery module 20 to the housing | casing 11 on both sides of the heat conductive member 27. FIG.

  Step S4 is performed during the self-discharge of the battery cell 21. In this case, since the battery cell 21 self-discharge and the application and curing of the TIM 51 can be performed in parallel, the productivity of the battery module 20 can be further improved.

  In step S4, the TIM 51 is applied in a state where the opposite surface of the housing 11 on the side surface 21b of the battery cell 21 faces upward. In this case, the TIM 51 is out of a predetermined region on the facing surface (for example, a region other than the second main body portion 22b) during the curing of the TIM 51, as compared with a state where the facing surface is directed sideways or downward. It can suppress flowing out. In addition, since the TIM 51 can be easily flattened before the TIM 51 is cured, the thickness of the heat conducting member 27 can be easily controlled and the flatness of the heat conducting member 27 can be improved. Thereby, since the compression rate of the heat conducting member 27 when the battery module 20 is fixed to the housing 11 is made uniform, the reaction force of the heat conducting member 27 on the battery module 20 can be made uniform.

  In the present embodiment, the battery cell 21 is left stationary during self-discharge. By completing step S4 at this time, the TIM 51 can be prevented from being unevenly distributed in a predetermined region due to vibration or the like. Further, by performing Step S6 after Step S4 is completed and the heat conducting member 27 is formed, vibration generated when the control device 26 and the like are assembled affects the shape and the like of the heat conducting member 27. Can be prevented.

  Moreover, the main surface 21a which is a surface crossing the direction Y of the battery cell 21 is in contact with the heat transfer plate 22, and the heat transfer plate 22 is in contact with the main surface 21a and the first main body portion 22a and the first main body portion. In step S4, TIM 51 is applied on the second main body portion 22b of the heat transfer plate 22 in a step S4. In this case, the heat conducting member 27 is formed on the second main body portion 22b of the heat transfer plate 22 for conducting the heat generated in the battery cell 21. Therefore, the heat generated in the battery cell 21 can be conducted to the heat conducting member 27 via the heat transfer plate 22, and the heat dissipation of the battery cell 21 can be improved.

  In addition, the manufacturing method of the battery module which concerns on this invention, and the manufacturing method of a battery pack are not limited to the said embodiment. For example, although step S4 is performed during the self-discharge of the battery cell 21, it is not limited to this. For example, step S4 may be performed before the self-discharge of the battery cell 21. That is, the order of step S3 and step S4 may be reversed. In addition, the period in which the TIM 51 is cured may partially overlap with the period in which the battery cells 21 are self-discharged, or may overlap all.

  Moreover, in this embodiment, although TIM51 is apply | coated in the state which faced the opposing surface prescribed | regulated by the 2nd main-body part 22b in step S4, it is not restricted to this. For example, when the viscosity of the TIM 51 is very high, the TIM 51 may be applied so as to cover the second main body portion 22b without setting the facing surface upward.

  Moreover, in this embodiment, although the battery module 20 has the some heat exchanger plate 22 containing the 1st main-body part 22a and the 2nd main-body part 22b, it is not restricted to this. For example, the battery module 20 may not include the heat transfer plate 22, or may include one or a plurality of heat transfer plates having only the first main body portion 22a. In these cases, the TIM 51 is applied directly on the side surface 21 b of the battery cell 21.

  Moreover, in this embodiment, although the 1st bracket 23 and the 2nd bracket 24 have the attaching part 42, it is not restricted to this. For example, the first bracket 23 and the second bracket 24 may have only the clamping part 41. In this case, the first bracket 23 and the second bracket 24 may be fixed to the housing 11 using, for example, an L-shaped metal fitting.

  DESCRIPTION OF SYMBOLS 10 ... Battery pack, 11 ... Housing | casing, 11e ... Side plate, 11f ... Hole, 20 ... Battery module, 21 ... Battery cell, 21a ... Main surface, 21b ... Side surface, 22 ... Heat-transfer plate, 22a ... 1st main-body part, 22b ... 2nd main-body part, 27 ... Heat conduction member, 51 ... TIM (thermal conduction material), D1, D2 ... Offset, T1 ... 1st terminal, T2 ... 2nd terminal.

Claims (6)

A method for producing a battery module, wherein a solid heat conducting member formed by curing a liquid heat conducting material is fixed to a casing, and a plurality of battery cells are arranged in one direction,
Applying the heat conductive material on a facing surface of the battery cell facing the housing;
And a step of self-discharging the battery cell,
In the step of self-discharging the battery cell, the heat conductive material is cured,
Manufacturing method of battery module.   The method of manufacturing a battery module according to claim 1, wherein the step of applying the heat conductive material is performed before the step of self-discharging the battery cell.   The method of manufacturing a battery module according to claim 1, wherein the step of applying the heat conductive material is performed during self-discharge of the battery cell.   The manufacturing of the battery module according to any one of claims 1 to 3, wherein, in the step of applying the heat conductive material, the heat conductive material is applied in a state where the facing surface of the battery cell faces upward. Method. In the one direction, a plurality of heat transfer plates arranged alternately with the plurality of battery cells are provided,
The heat transfer plate has a first main body portion that contacts a main surface that is a surface that intersects the one direction in the battery cell, and a direction that intersects the main surface from an end of the first main body portion on the opposed surface side. A second main body extending to
The manufacturing method of the battery module as described in any one of Claims 1-4 which apply | coats the said heat conductive material on the said 2nd main-body part of the said heat-transfer plate in the process of apply | coating the said heat conductive material.   Manufacturing a battery pack comprising a step of fixing the battery module according to any one of claims 1 to 5 so that the heat conducting member is in contact with the housing after the step of self-discharging the battery cell. Method.

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