JP2018063827A - Manufacturing method for battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a battery module, capable of achieving high productivity while ensuring quality.SOLUTION: The manufacturing method for a battery module includes: a first process of preparing for a laminate 10X formed by laminating a plurality of battery cells 11 onto each other along the first direction; a second process of arranging thermistors 91 on battery cells 11C through a liquid heat conduction members 92; and a third process of mounting pressure parts 70 pressing the thermistors 91 against the battery cells 11C on the battery cells 11C.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a method for manufacturing a battery module.

  In Patent Document 1, a power storage device group having a plurality of power storage devices arranged in one direction, a pair of restraining members disposed on both sides of the power storage device group, and a power storage device group are disposed above the power storage device group. A power storage device module is described that includes a cover that is fixed to a pair of restraining members and a temperature sensor that is placed on the top surface of the power storage device and detects the temperature of the power storage device. In this power storage device module, an expansion absorbing portion that absorbs expansion of the power storage device is disposed on one side of the pair of restraining members. The cover is assembled with a pressing portion that holds the temperature sensor against the power storage device.

JP 2006-122575 A

  As a method of manufacturing the above power storage device module, for example, a temperature sensor is placed on the upper surface of the power storage device, and a pressing unit is disposed above the power storage device, whereby the temperature sensor is pressed against the power storage device by the pressing unit. It is possible to do.

  Here, in order to ensure the quality, the temperature sensor is attached to the upper surface of the power storage device using, for example, a double-sided tape so that the position of the temperature sensor does not shift on the upper surface of the power storage device before the pressing portion is arranged. Can be considered. However, handling is difficult, for example, it is necessary to remove the release paper of the double-sided tape. In recent years, from the viewpoint of improving productivity, it has been studied to automate the manufacture of battery modules while ensuring quality.

  An object of this invention is to provide the manufacturing method of the battery module which can improve productivity, ensuring quality.

  The battery module manufacturing method according to the present invention includes a first step of preparing a stacked body including a plurality of battery cells stacked together along a first direction, and a temperature on the battery cell via a liquid heat conducting member. A second step of arranging the sensor, and a third step of providing the battery cell with a pressing portion that presses the temperature sensor against the battery cell.

  In this method of manufacturing a battery module, a temperature sensor is disposed on the battery cell via a liquid heat conducting member in the second step, and the pressing portion that presses the temperature sensor against the battery cell in the third step is the battery cell. Is provided. For this reason, using the adhesiveness of the liquid heat conducting member, the temperature sensor can be temporarily fixed on the battery cell before the pressing portion is provided, and the position of the temperature sensor can be prevented from shifting. At this time, it is not necessary to use a double-sided tape that is difficult to handle. As a result, it is possible to improve productivity while ensuring quality.

  In the battery module manufacturing method according to the present invention, in the third step, the cover having the pressing portion is disposed so as to face the battery cells so as to cover the plurality of battery cells. It may be provided. In this case, since the cover has a pressing portion, the pressing portion can be provided to the battery cell at the same time as the cover is disposed so as to cover the plurality of battery cells.

  In the battery module manufacturing method according to the present invention, the second step includes a fourth step of applying a heat conductive member on the battery cell, and a fifth step of placing a temperature sensor on the heat conductive member. But you can. In this case, in the fourth step, for example, after applying the heat conduction member on the battery cell using a dispenser or the like, the temperature sensor may be placed on the heat conduction member in the fifth step, so that automation is facilitated. It becomes possible.

  In the battery module manufacturing method according to the present invention, in the fourth step, the heat conducting member is disposed so as to interpose the entire region between the battery cell and the temperature sensor after the third step. A sixth step of adjusting the application position and the application amount may be included. In this case, since the heat conducting member is interposed over the entire region between the battery cell and the temperature sensor, the heat transfer performance from the battery cell to the temperature sensor is ensured, and the quality can be ensured.

  In the method for manufacturing the battery module according to the present invention, the thermal conductivity of the heat conducting member may be 2.0 W / mK or more. In this case, compared with the case where the adhesive agent etc. whose heat conductivity is comparatively low are used, for example, the fall of the heat transfer performance from a battery cell to a temperature sensor is suppressed, and quality can be ensured.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the battery module which can improve productivity, ensuring quality can be provided.

FIG. 1 is a perspective view showing an overall configuration of a battery module manufactured by a method for manufacturing a battery module according to an embodiment. 2 is a cross-sectional view taken along the line II-II of the battery module shown in FIG. FIG. 3 is a cross-sectional view taken along a plane perpendicular to the first direction of the battery cell shown in FIG. 1. FIG. 4 is a perspective view of the battery cell and the holder shown in FIG. FIG. 5 is a cross-sectional view taken along a plane orthogonal to the first direction of the battery module shown in FIG. FIG. 6 is a perspective view of the first cover shown in FIG. 1. FIG. 7 is a cross-sectional view for explaining the preparation process. FIG. 8 is a cross-sectional view for explaining the coating process. FIG. 9 is a cross-sectional view for explaining the coating process. FIG. 10 is a cross-sectional view for explaining the mounting process. FIG. 11 is a cross-sectional view for explaining the pressing step.

  Hereinafter, an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings do not necessarily match those described. Further, in the description, words indicating directions such as “up” and “down” are convenient words based on the state shown in the drawings. In each figure, an X axis, a Y axis, and a Z axis that are orthogonal to each other are set for convenience of explanation.

  The battery module 10 manufactured by the battery module manufacturing method according to the embodiment will be described. As shown in FIGS. 1 and 2, the battery module 10 includes a plurality of battery cells 11 such as a lithium ion secondary battery or a nickel hydride storage battery. In the present embodiment, as an example, the number of battery cells 11 is thirteen. Each of the plurality of battery cells 11 is stacked on each other along the first direction (for example, the X-axis direction) while being individually held by the plurality of holders 21.

  The battery module 10 includes a stacked body 11X including a plurality of battery cells 11 stacked together along a first direction, end plates 12A and 12B that restrain the stacked body 11X along the first direction, and a first direction. And an elastic member 17 constrained together with the battery cell 11. The pair of end plates 12A and 12B are provided at both ends of the stacked body 11X in the first direction. An intermediate plate 15 is disposed between the stacked body 11X and the end plate 12A. The elastic member 17 is disposed between the intermediate plate 15 and the end plate 12A. The elastic member 17 is an elastic member made of an elastic material such as rubber or sponge.

  Bolts B are inserted through the pair of end plates 12 </ b> A and 12 </ b> B, the intermediate plate 15, and the holder 21. The bolt B is inserted so as to be bridged from one end plate 12A to the other end plate 12B, and is screwed to the nut N on the other end plate 12B side.

  As shown in FIGS. 3 and 4, the battery cell 11 is electrically connected to the electrode assembly 52, the case 51 that houses the electrode assembly 52, and the electrodes (each of the positive electrode and the negative electrode) of the electrode assembly 52. And a pair of electrode terminals 55 protruding from the case 51.

  The case 51 includes a box-shaped main body 53 that houses the electrode assembly 52 and a plate-shaped lid 54 that closes the opening of the main body 53. Electrode terminals 55 (a positive terminal and a negative terminal) are provided on the upper surface 54 </ b> A of the lid portion 54. The electrode terminal 55 is electrically connected to the electrode assembly 52 through the conductive member 58.

  The electrode assembly 52 includes a plurality of positive electrodes (not shown) and a negative electrode (not shown), and a separator (not shown) disposed between the positive electrode and the negative electrode. The positive electrode and the negative electrode are alternately stacked via separators. The stacking direction of the positive electrode and the negative electrode substantially coincides with the stacking direction of the battery cells 11 (first direction: X-axis direction).

  On the upper surface 54A of the lid portion 54, there is provided an open valve 57 that breaks and releases the internal pressure of the case 51 when the internal pressure of the case 51 rises to a threshold value. The threshold value is set so that when the internal pressure of the case 51 increases, the release valve 57 is broken before the case 51 is damaged by the internal pressure of the case 51.

  As shown in FIG. 4, the holder 21 includes a rectangular flat plate-shaped bottom wall portion 22, a side wall portion 23, a side wall portion 24, a back surface portion 25, a pair of extending portions 26, a pair of projecting portions 29, and a pair of terminals. The housing portion 31 and a pair of projecting portions 33 are provided.

  The bottom wall portion 22 is a portion that covers the bottom surface (surface opposite to the top surface 54A) of the battery cell 11 when the battery cell 11 is held. The side wall part 23 and the side wall part 24 are disposed so as to face each other at both ends of the bottom wall part 22 in a second direction (for example, the Y-axis direction) that intersects the first direction, and intersect the first direction and the second direction. It extends along the third direction (for example, the Z-axis direction). The side wall portion 23 and the side wall portion 24 are portions that cover the side surfaces (surfaces connecting the upper surface 54A and the bottom surface) of the battery cells 11 when the battery cells 11 are held. The back surface portion 25 is provided so as to connect the side wall portion 23 and the side wall portion 24 in a state where the thickness direction is along the first direction. The position of the upper end 25 </ b> A of the back surface part 25 coincides with the positions 23 </ b> A and 24 </ b> A of the upper ends of the side wall part 23 and the side wall part 24. The back surface portion 25 covers a part of the upper surface 54 </ b> A of the lid portion 54 in the battery cell 11 when holding the battery cell 11.

  The extending part 26 is provided at the positions 23A and 24A of the upper ends of the side wall part 23 and the side wall part 24, respectively. The pair of extending portions 26 are disposed so as to face each other and extend along the third direction. Protrusions 27 are provided on surfaces of the pair of extending portions 26 facing each other.

  As shown in FIGS. 4 and 5, the protrusion 27 is formed at the tip end portion of the extending portion 26 from the positions 23 </ b> A and 24 </ b> A of the side wall portion 23 and the side wall portion 24. It is formed at a position separated by a distance corresponding to the height of the installation portion 61D. As an example, the protrusion 27 is formed in a triangular prism shape extending along the first direction at the distal end portion of the extending portion 26. The protrusion 27 protrudes from the extending portion 26 onto the first cover 61 along the second direction. Therefore, the protrusion 27 can be engaged with the standing portion 61D.

  As shown in FIGS. 4 and 5, the projecting portion 29 is provided at positions 23 </ b> C and 24 </ b> C of the lower end portions of the side wall portion 23 and the side wall portion 24 in the third direction. The projecting portion 29 is provided with an insertion hole 29A penetrating along the first direction. The aforementioned bolt B is inserted through the insertion hole 29A.

  The terminal accommodating portions 31 are respectively provided at both ends of the upper end 25A of the back surface portion 25 in the second direction. The terminal accommodating portion 31 is provided so as to continue to the side wall portion 23 and the side wall portion 24. The terminal accommodating portion 31 is U-shaped when viewed from the third direction, and opens in the direction opposite to the first direction. The terminal accommodating portion 31 is a portion that surrounds the electrode terminal 55 of the battery cell 11 when holding the battery cell 11.

  Each of the projecting portions 33 is provided adjacent to the terminal accommodating portion 31 at the upper end 25 </ b> A of the back surface portion 25. The protruding portion 33 has a quadrangular prism shape extending along the first direction, and the length of the protruding portion 33 corresponds to the length of the bottom wall portion 22 in the first direction, for example. The projecting portion 33 is provided with an insertion hole 33A penetrating along the first direction. The aforementioned bolt B is inserted through the insertion hole 33A.

  In the holder 21, a housing portion CL that houses the battery cell 11 is formed by a space surrounded by the bottom wall portion 22, the side wall portion 23, the side wall portion 24, the back surface portion 25, and the protruding portion 33 described above.

  As shown in FIGS. 1 and 2, the battery module 10 includes a first cover 61, a second cover 62, and a second cover 63. The first cover 61 is provided to face the upper surface 54A. The first cover 61 is disposed to face the upper surface 54A so as to cover the battery cell 11C, which is the battery cell 11 provided with the thermistor 91. On the first cover 61, for example, a control device 93 including an electronic component that contributes to charging / discharging of the battery cell 11 and a battery ECU that controls the battery module 10 is placed. The first cover 61 is a resin member, for example.

  As shown in FIGS. 5 and 6, the first cover 61 includes a main body portion 61A, a pair of standing portions 61D, and a pair of extending portions 61E. The main body 61A is formed in a rectangular flat plate shape. The main body portion 61A has a facing surface 61S that faces the upper surface 54A, and a facing surface 61T that extends along the upper surface 54A on the opposite side of the facing surface 61S.

  The standing portions 61D are provided at both ends of the main body portion 61A in the second direction. The standing portion 61D is erected on the opposite surface 61T so as to extend along the third direction. The pair of standing portions 61D oppose each other in the second direction. The standing portion 61D extends over substantially the entire body portion 61A in the first direction.

  The extending portion 61E is erected on the facing surface 61S so as to extend along the third direction. The pair of extending portions 61E are disposed so as to face each other with the release valve 57 interposed therebetween in the second direction. The extending portion 61E extends over substantially the entire body portion 61A in the first direction. The extending portion 61E is in contact with the upper surface 54A.

  The first cover 61 has a pressing portion 70 for pressing the thermistor 91 against the battery cell 11C. The pressing portion 70 includes a protrusion 71, a spring seat portion 72, and a spring SP. As an example, the protrusion 71 is formed in a cylindrical shape so as to protrude from the facing surface 61S. The protrusion 71 is formed integrally with the first cover 61. The protrusion 71 regulates the position of the spring SP and suppresses the spring SP from coming off. The spring seat portion 72 is a portion that comes into contact with one end portion of the spring SP. The spring seat portion 72 is a part of the facing surface 61S as an example. The spring seat 72 may be formed so as to protrude from the facing surface 61S, or may be formed by recessing the facing surface 61S.

  One end of the spring SP is fitted to the protrusion 71 so as to surround the protrusion 71. The other end of the spring SP is in contact with the upper surface of the thermistor 91. The spring SP is compressed between the spring seat portion 72 and the thermistor 91, thereby pressing the thermistor 91 against the upper surface 54A of the battery cell 11C.

  The second cover 62 is disposed to face the upper surface 54A so as to be adjacent to the first cover 61 along the first direction. As shown in FIG. 2, the second cover 62 is fixed to the end plate 12B at one end 62F in the first direction. The second cover 63 is disposed to face the upper surface 54A so as to be adjacent to the first cover 61 on the side opposite to the second cover 62 along the first direction. The second cover 63 is fixed to the intermediate plate 15 at one end 63F in the first direction. The second covers 62 and 63 are, for example, resin members.

  As shown in FIGS. 2 and 6, the first cover 61 and the second cover 62 have overlapping portions 61B and 62B that overlap each other along a direction intersecting the upper surface 54A (third direction: Z-axis direction). Each has. The overlapping part 62B is formed at the end of the second cover 62 opposite to the end 62F fixed to the end plate 12B. The first cover 61 and the second cover 63 have an overlapping portion 61C and an overlapping portion 63C that overlap each other along the direction intersecting the upper surface 54A. The overlapping part 63 </ b> C is formed at the end of the second cover 63 opposite to the end 63 </ b> F fixed to the intermediate plate 15. The overlapping portions 61B and 61C are formed at both ends of the first cover 61 in the first direction, respectively. The overlapping part 61B overlaps with the overlapping part 62B, and the overlapping part 61C overlaps with the overlapping part 63C. In other words, the first cover 61 is movable relative to the second covers 62 and 63 in the first direction in a state where they overlap each other.

  The second covers 62 and 63 have the same configuration as the first cover 61 except that the configurations of the end portions 62F and 63F and the configurations of the overlapping portions 62B and 63C described above are provided. Therefore, the description which overlaps with the structure of the 1st cover 61 about the 2nd covers 62 and 63 is abbreviate | omitted.

  The battery module 10 includes a plurality of thermistors (temperature sensors) 91 and a heat conducting member 92. For example, as shown in FIG. 2, the thermistor 91 includes a battery cell 11A that is the third battery cell 11 counted from the end plate 12A and a battery cell that is the third battery cell 11 counted from the end plate 12B. 11B and the battery cell 11C located in the center of the laminated body of the battery cells 11 are provided. As shown in FIG. 1, the thermistor 91 is connected to a signal line (not shown) connected to the control device 93 via a connection terminal. The detection signal of the thermistor 91 is transmitted to the control device 93 via the signal line and the connection terminal. The thermistor 91 is disposed on the upper surface 54A via the heat conducting member 92 in a state where the battery cell 11 is accommodated in the accommodating portion CL. The thermistor 91 has a facing surface 91S that faces the upper surface 54A in a state of being disposed on the upper surface 54A.

  The heat conducting member 92 is, for example, a liquid member having adhesiveness. Here, the “liquid” may include a gel. The adhesiveness of the heat conducting member 92 is such that the thermistor 91 is not displaced on the upper surface 54A of the battery cell 11 from when the thermistor 91 is disposed on the heat conducting member 92 until it is pressed by the pressing portion 70. It is about sticky. Therefore, even if the heat conducting member 92 is in a liquid state at the time of manufacturing the battery module 10, for example, it may be assumed that the heat conducting member 92 is in a solid state after a predetermined time has elapsed after the manufacturing. Alternatively, the heat conducting member 92 may be cured by a predetermined process after the thermistor 91 is disposed. The heat conductivity of the heat conducting member 92 is, for example, 2.0 W / mK or more. The material of the heat conducting member 92 is, for example, a silicon resin or a urethane resin. The heat conducting member 92 is disposed on the upper surface 54A before the thermistor 91 is placed on the upper surface 54A, for example. The heat conducting member 92 is applied to the upper surface 54A using, for example, the dispenser 100 (see FIGS. 8 and 9).

  Subsequently, an example of a method for manufacturing the battery module 10 will be described with reference to FIGS.

  In this method of manufacturing the battery module 10, first, as shown in FIG. 7, a preparation step (first step) for preparing a stacked body 10X including a plurality of battery cells 11 stacked on each other along the first direction. Do. In the preparation step, a plurality of battery cells 11 are stacked on each other along the first direction to produce a stacked body 11X. Thereafter, the end plates 12A and 12B are disposed on both sides of the stacked body 11X in the first direction. Thereafter, the end plates 12A and 12B are fastened by bolts B and nuts N, thereby restraining the laminate 11X together with the intermediate plate 15 and the elastic member 17 along the first direction from both sides of the laminate 11X in the first direction. Thereby, the laminated body 10X is prepared.

  Subsequently, as shown in FIGS. 8 to 10, an application step (fourth step) for applying the heat conducting member 92 on the battery cell 11 and a placing step for placing the thermistor 91 on the heat conducting member 92. (5th process). 8 to 10, as an example, the case where the thermistor 91 is arranged on the upper surface 54A of the battery cell 11C located in the center of the stacked body 11X is illustrated.

  Specifically, in the application process, as shown in FIG. 8, the heat conductive member 92 is applied to the upper surface 54 </ b> A using, for example, a dispenser 100 that discharges the heat conductive member 92 from the nozzle 101. The dispenser 100 is controlled by a control device (not shown). In the dispenser 100, an application position (hereinafter also simply referred to as “application position”) where the nozzle 101 discharges the heat conducting member 92 on the upper surface 54A, and an application amount (hereinafter referred to as “application position”) where the nozzle 101 discharges the heat conducting member 92 on the upper surface 54A. , Also simply referred to as “coating amount”).

  Here, in the application step, the application position and the application amount are adjusted before applying the heat conducting member 92 to the upper surface 54A (sixth step). As an example, the application position is a position (hereinafter also referred to as a center position) on the upper surface 54A corresponding to the central portion of the facing surface 91S of the thermistor 91 placed in the placement step. Thereby, the heat conduction member 92 can be efficiently interposed in the region between the upper surface 54A and the thermistor 91 after the pressing step described later. For example, when the thermistor 91 is pressed in a pressing process described later (hereinafter also simply referred to as “pressing the thermistor 91”), the heat conducting member 92 is pushed out along the upper surface 54A, and the application amount is from the third direction. The amount is such that the thermistor 91 spreads beyond the area of the facing surface 91S. Thereby, the heat conduction member 92 can be interposed over the entire region between the upper surface 54A and the thermistor 91 after the pressing step. That is, here, the application position and the application amount of the heat conductive member 92 are adjusted so that the heat conductive member 92 is interposed over the entire region between the battery cell 11C and the thermistor 91 after the pressing step.

  In the coating process, for example, when the thermistor 91 spreads to an area substantially the same as the area of the opposing surface 91S when viewed from the third direction by pressing of the thermistor 91, for example, the coating amount is minimized. Amount. Even if the application position is deviated from the center position, the thermistor more than the area of the opposing surface 91S when viewed from the third direction by pressing of the thermistor 91 because the application amount is made larger than the minimum amount. 91 can be widened.

  Thereafter, as shown in FIG. 9, the nozzle 101 is moved. At this time, since the heat conducting member 92 is in a liquid state, the heat conducting member 92 applied to the upper surface 54A spreads on the upper surface 54A. Thereafter, in the placing step, as shown in FIG. 10, the thermistor 91 is placed on the heat conducting member 92 that spreads on the upper surface 54A. In the mounting step, the thermistor 91 can be mounted on the heat conducting member 92 by, for example, a robot hand (not shown) that holds and moves the thermistor 91.

  The application step and the placement step described above are an arrangement step (second step) in which the thermistor 91 is arranged on the upper surface 54A of the battery cell 11 (that is, on the battery cell 11) via the liquid heat conduction member 92. That is, the second step includes a fourth step of applying the heat conducting member 92 on the battery cell 11 and a fifth step of placing the thermistor 91 on the heat conducting member 92.

  Then, the press process (3rd process) which provides the press part which presses the thermistor 91 with respect to the battery cell 11C with respect to the battery cell 11C is performed. In the pressing step, the first cover 61 having the pressing portion 70 is arranged to face the battery cell 11C so as to cover the plurality of battery cells 11. Here, since the arrangement step (application step and placement step) is performed before the pressing step, before the pressing portion 70 is provided to the battery cell 11C using the adhesiveness of the liquid heat conducting member 92. Further, the position of the thermistor 91 on the battery cell 11C is prevented from shifting. Therefore, the spring SP contacts the upper surface of the thermistor 91 at the same time that the first cover 61 having the pressing portion 70 is arranged so as to cover the plurality of battery cells 11. Therefore, the pressing portion 70 can be provided for the battery cell 11C at the same time when the first cover 61 is disposed.

  At this time, the first cover 61 is fixed to the stacked body 10X by the protrusion 27 engaging with the standing portion 61D. Thereby, the battery module 10 is obtained.

  As described above, in the method for manufacturing the battery module 10, the temperature sensor is disposed on the battery cell 11C via the liquid heat conducting member 92 in the disposing step (second step), and the thermistor 91 is disposed in the pressing step (third step). A pressing portion 70 that presses against the battery cell 11C is provided to the battery cell 11C. For this reason, the thermistor 91 is temporarily fixed on the battery cell 11C before the pressing portion 70 is provided using the adhesiveness of the liquid heat conducting member 92, and the position of the thermistor 91 can be prevented from shifting. At this time, it is not necessary to use a double-sided tape that is difficult to handle. As a result, it is possible to improve productivity while ensuring quality.

  In the manufacturing method of the battery module 10, in the pressing step, the first cover 61 having the pressing portion 70 is disposed so as to face the battery cell 11 </ b> C so as to cover the plurality of battery cells 11, whereby the pressing portion 70 is replaced with the battery cell. Provided for 11C. Thus, since the 1st cover 61 has the press part 70, the press part 70 can be provided with respect to 11 C of battery cells simultaneously with arrange | positioning the 1st cover 61 so that the some battery cell 11 may be covered.

  In the manufacturing method of the battery module 10, the arranging step includes an application step (fourth step) for applying the heat conducting member 92 on the battery cell 11 and a placing step (placement) for placing the thermistor 91 on the heat conducting member 92. 5th process). Accordingly, in the application process, for example, after the heat conductive member 92 is applied on the battery cell 11C using the dispenser 100 or the like, the thermistor 91 may be mounted on the heat conductive member 92 in the mounting process. Automation can be achieved.

  In the manufacturing method of the battery module 10, the application process is performed by applying the heat conduction member 92 so that the heat conduction member 92 is interposed over the entire region between the battery cell 11 </ b> C and the thermistor 91 after the pressing process. And the coating amount are adjusted (sixth step). Thereby, since the heat conduction member 92 is interposed over the entire region between the battery cell 11C and the thermistor 91 (that is, between the upper surface 54A and the opposing surface 91S), heat transfer performance from the battery cell 11C to the thermistor 91 is achieved. Is ensured and quality can be ensured.

  In the manufacturing method of the battery module 10, the heat conductivity of the heat conductive member 92 is 2.0 W / mK or more. Thereby, compared with the case where the adhesive agent etc. whose heat conductivity is comparatively low are used, for example, the fall of the heat transfer performance from the battery cell 11C to the thermistor 91 is suppressed, and quality can be ensured.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment. Various modifications can be made without departing from the spirit of the invention.

  The battery module 10 of the above embodiment includes the three covers (the first cover 61 and the second covers 62 and 63) that are adjacent to each other in the stacking direction (first direction) of the battery cells 11, but is not limited thereto. . The battery module 10 only needs to include at least one first cover 61.

  In the said embodiment, although the application | coating process which apply | coats the heat conductive member 92 on the battery cell 11 and the mounting process which mounts the thermistor 91 on the heat conductive member 92 were illustrated, the arrangement | positioning process Other processes may be further included.

  In the above embodiment, in the pressing step, the first cover 61 having the pressing portion 70 is disposed so as to face the battery cell 11C so as to cover the plurality of battery cells 11, so that the pressing portion 70 is placed on the battery cell 11C. However, the step of arranging the first cover 61 and the step of providing the pressing portion 70 to the battery cell 11C may be separate.

  In the said embodiment, although 2.0 W / mK was illustrated as a lower limit of the heat conductivity of the heat conductive member 92, 4.0 W / mK or more may be sufficient as the heat conductivity of the heat conductive member 92. Further, the heat conductivity of the heat conducting member 92 may be 6.0 W / mK or more. The upper limit of the thermal conductivity of the heat conducting member 92 can be defined by the heat conductivity within a range in which the heat conducting member 92 can maintain the state of being a liquid member having adhesiveness.

  In the above-described embodiment, the pressing unit 70 presses the thermistor 91 against the battery cell 11C with the spring SP. However, the thermistor 91 may be pressed against the battery cell 11C with another elastic member such as rubber. In the above embodiment, one thermistor 91 is provided for each of the three battery cells 11A, 11B, and 11C, and the battery module 10 includes three thermistors 91. However, as the number of thermistors 91, Other numbers may be used. At this time, for example, the thermistor 91 may be provided in the battery cell 11 where the temperature tends to increase.

  Further, in the arranging step (second step), before the thermistor 91 is arranged on the upper surface 54A of the battery cell 11C, the heat conducting member 92 is applied to the facing surface 91S of the thermistor 91, and then the thermistor 91 and the heat conducting member are conducted. The member 92 may be collectively disposed on the upper surface 54A. That is, in the arranging step, the thermistor 91 may be arranged on the battery cell 11C via the liquid heat conducting member 92.

  DESCRIPTION OF SYMBOLS 10 ... Battery module, 10X ... Laminated body, 11, 11A, 11B, 11C ... Battery cell, 61 ... 1st cover (cover), 62, 63 ... 2nd cover (cover), 70 ... Press part, 91 ... Thermistor ( Temperature sensor), 92 ... heat conducting member.

Claims (5)

A first step of preparing a laminated body including a plurality of battery cells laminated together along a first direction;
A second step of disposing a temperature sensor on the battery cell via a liquid heat conduction member;
A third step of providing the battery cell with a pressing portion for pressing the temperature sensor against the battery cell;
A method for manufacturing a battery module. In the third step, the pressing portion is provided to the battery cell by disposing a cover having the pressing portion so as to face the battery cell so as to cover the plurality of battery cells.
The manufacturing method of the battery module of Claim 1. The second step includes a fourth step of applying the heat conducting member on the battery cell, and a fifth step of placing the temperature sensor on the heat conducting member.
The manufacturing method of the battery module of Claim 1 or 2. In the fourth step, the application position and the application amount of the heat conducting member are set so that the heat conducting member is interposed over the entire region between the battery cell and the temperature sensor after the third step. Including the sixth step of adjusting,
The manufacturing method of the battery module of Claim 3. The heat conductivity of the heat conducting member is 2.0 W / mK or more.
The manufacturing method of the battery module as described in any one of Claims 1-4.

Images