JP2017041378A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module which enables improvement of heat radiation performance.SOLUTION: A battery module of an embodiment has secondary battery cells, a case, and a pressing part. The case houses the secondary battery cells and has a first surface and a second surface that faces in a direction different from the first surface. The pressing part presses the secondary battery cells toward the first surface. Thermal conductivity in a direction from the interior to the exterior of the case through the first surface is higher than thermal conductivity in a direction from the interior to the exterior of the case through the second surface.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to a battery module.

A battery module including a plurality of secondary battery cells and a synthetic resin case that accommodates the plurality of secondary battery cells has been proposed.
Here, the battery module as described above generates heat during use. In recent years, battery modules may increase in temperature due to heat generation due to an increase in capacity or size. For this reason, the battery module still has room for improvement in terms of improving heat dissipation.

JP 2013-191440 A JP 2012-248482 A

  The problem to be solved by the present invention is to provide a battery module capable of improving heat dissipation.

  The battery module of the embodiment includes a secondary battery cell, a case, and a pressing portion. The case houses the secondary battery cell, and has a first surface and a second surface facing in a direction different from the first surface. The pressing portion presses the secondary battery cell toward the first surface. The thermal conductivity in the direction from the inside of the case to the outside through the first surface is higher than the thermal conductivity in the direction from the inside of the case to the outside through the second surface.

The perspective view which shows the battery unit containing the battery module of 1st Embodiment. FIG. 2 is a partially exploded perspective view showing the battery module shown in FIG. 1. FIG. 3 is an exploded perspective view of the battery module shown in FIG. Sectional drawing which shows the battery module shown in FIG. Sectional drawing which follows the F5-F5 line | wire of the battery module shown in FIG. Sectional drawing which shows the inside of the battery module of the modification of 1st Embodiment. The perspective view which shows the battery module of 2nd Embodiment. Sectional drawing which shows the inside of the battery module shown in FIG. The perspective view which shows the battery module of 3rd Embodiment. Sectional drawing which shows the inside of the battery module shown in FIG. Sectional drawing which shows the modification of the battery module shown in FIG. Sectional drawing which shows the battery module of 4th Embodiment. The perspective view which shows the battery module of 5th Embodiment. The front view which shows the battery module of 6th Embodiment. The perspective view which shows the battery module of 7th Embodiment.

  Hereinafter, the battery module of the embodiment will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. And the description which overlaps those structures may be abbreviate | omitted.

(First embodiment)
The battery module 1 according to the first embodiment will be described with reference to FIGS. 1 to 5.
FIG. 1 is a perspective view showing a battery unit U including the battery module 1 of the present embodiment.
As shown in FIG. 1, the battery module 1 of the present embodiment is combined with another type of battery module 2 to form one battery unit U. Hereinafter, for convenience of explanation, the battery module 1 of the present embodiment may be referred to as “first battery module 1”, and the battery module 2 combined with the first battery module 1 may be referred to as “second battery module 2”.

  The first battery module 1 is an assembled battery module including a plurality of battery cells 12 (see FIG. 2). For example, the first battery module 1 is a lithium ion battery module including a plurality of lithium ion battery cells. The first battery module 1 will be described later in detail. Further, in some drawings including FIG. 1, the first battery module 1 is schematically shown with the electrode terminals 45a and 45b exposed. However, actually, the electrode terminals 45a and 45b are covered with a bus bar 53 as shown in FIG.

  The second battery module 2 is, for example, a lead battery (lead storage battery) module. For example, the second battery module 2 is a battery module that has a different use from the first battery module 1 (that is, the heat generation timing is different because the discharge timing is different). The battery unit U including the first battery module 1 and the second battery module 2 is, for example, an in-vehicle battery unit for a hybrid vehicle. For example, the 1st battery module 1 supplies the electric power which operates the apparatus in a vehicle interior. On the other hand, the second battery module 2 supplies electric power necessary to start driving the engine. The second battery module 2 is an example of a member having a larger heat capacity than the first battery module 1. The second battery module 2 is an example of a member that generates a smaller amount of heat than the first battery module 1.

  As shown in FIG. 1, the battery unit U further includes a fixing member 3 (for example, a binding band) that fixes the first battery module 1 and the second battery module 2. The fixing member 3 is attached to the first battery module 1 and the second battery module 2 to bring the first battery module 1 and the second battery module 2 into close contact with each other. The fixing member 3 has elasticity, for example, and may apply a force toward the second battery module 2 to the first battery module 1.

Next, the battery module 1 (first battery module 1) will be described in detail.
FIG. 2 is a partially exploded perspective view showing the battery module 1.
As shown in FIG. 2, the battery module 1 includes a case 11, a plurality of battery cells (secondary battery cells) 12, a heat conductive sheet 13, and a metal member 14.

  The case 11 is formed of an insulating synthetic resin, such as polycarbonate (PC) or polyphenylene ether (PPE). The case 11 is formed in a rectangular box shape with an opening 16 provided on one surface.

  Specifically, the case 11 has a first surface S1, a second surface S2, a third surface S3, a fourth surface S4, a fifth surface S5, and a sixth surface S6. The “surface” of the case referred to in the present application means a portion that is exposed to the outside of the case and defines the outer shape of the case. In other words, the “surface” of the case means the boundary between the inside and the outside of the case. The “surface” of the case referred to in the present application is not limited to a surface defined by a tangible object, but may be a surface defined by an intangible object such as an opening.

  As shown in FIG. 2, the first surface S <b> 1 is a surface disposed toward the second battery module 2. In the present embodiment, the first surface S <b> 1 forms the upper surface of the case 11. In the present embodiment, an opening 16 capable of exposing the plurality of battery cells 12 is provided in the first surface S1.

On the other hand, the second surface S2 is a surface facing in a direction different from the first surface S1. For example, the second surface S2 is located on the opposite side of the first surface S1 with the battery cell 12 interposed therebetween. As used herein, “with a battery cell in between” means that the battery cell is positioned between the first surface and the second surface. That is, “with a battery cell in between” is not limited to a battery cell inserted between the first surface and the second surface and supported from both sides. This includes the case where a gap exists between the two surfaces.
The second surface S2 extends substantially parallel to the first surface S1. The second surface S2 forms the lower surface of the case 11, for example. Further, the first surface S1 and the second surface S2 spread in the direction in which the plurality of battery cells 12 are arranged.

  The third to sixth surfaces S3, S4, S5 and S6 are substantially orthogonal to the first surface S1 and the second surface S2, and between the edge of the first surface S1 and the edge of the second surface S2. It extends to. For example, the third surface S3 and the fourth surface S4 spread in the direction in which the plurality of battery cells 12 are arranged. The third surface S3 is provided with a plurality of insertion holes 35 through which electrode terminals 45a and 45b of battery cells 12 described later are passed. The fourth surface S4 is located on the side opposite to the third surface S3 with the battery cell 12 interposed therebetween. On the other hand, the fifth surface S5 and the sixth surface S6 spread in a direction substantially orthogonal to the third surface S3 and the fourth surface S4. The fifth surface S5 and the sixth surface S6 are separately located on both sides of the plurality of battery cells 12 in the direction in which the plurality of battery cells 12 are arranged.

  As shown in FIG. 2, the case 11 of the present embodiment has synthetic resin walls on the remaining five surfaces S2, S3, S4, S5, and S6 of the case 11 excluding the first surface S1. That is, the case 11 includes a second surface wall 22 that forms the second surface S2, a third surface wall 23 that forms the third surface S3, a fourth surface wall 24 that forms the fourth surface S4, and a fifth surface S5 that forms the fifth surface S5. It has the 5th surface wall 25 and the 6th surface wall 26 which forms 6th surface S6.

  On the other hand, the opening 16 is provided in the first surface S1. In the present embodiment, the opening 16 is provided in substantially the entire area of the first surface S1. The opening 16 has a size that allows the plurality of battery cells 12 to be exposed to the outside of the case 11. For example, the opening 16 can expose a later-described side surface 43 c of the plurality of battery cells 12.

In this embodiment, by providing the opening 16, the thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is the heat conductivity in the direction from the inside of the case 11 to the outside through the second surface S2. It is higher than conductivity. In other words, the heat flux of the first surface S1 is larger than the heat flux of the second surface S2. The term “thermal conductivity” as used in the present application means how easy the heat moves from the inside of the case to the outside through the surface. That is, “high thermal conductivity” includes not only the case where the material forming the surface has high thermal conductivity but also the case where the thickness of the wall forming the surface is thin (or no wall). .
In the case of the present embodiment, an opening 16 is provided on the first surface S1 of the case 11. The battery cell 12 is exposed to the outside of the case 11 through the opening 16. For this reason, in this embodiment, the battery cell 12 can release more heat to the outside of the case 11 through the first surface S <b> 1 of the case 11 as compared with the case where the second surface S <b> 2 of the case 11 is passed.

  Furthermore, in this embodiment, the thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is any one of the second to sixth surfaces S2, S3, S4, S5, and S6. It is higher than the thermal conductivity in the direction from the inside of the case 11 to the outside through the two surfaces. In other words, the heat flux of the first surface S1 is larger than the heat flux of any one of the remaining five surfaces S2, S3, S4, S5, S6.

  In the present embodiment, the thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is that of the case 11 through any one of the second to sixth surfaces S2, S3, S4, S5, and S6. It is higher than the thermal conductivity in either direction from the inside to the outside. In other words, the heat flux of the first surface S1 is larger than the heat flux of any one of the remaining five surfaces S2, S3, S4, S5, and S6. That is, the heat flux of the first surface S1 is larger than the heat flux of the second surface S2, larger than the heat flux of the third surface S3, larger than the heat flux of the fourth surface S4, and the heat flow of the fifth surface S5. It is larger than the bundle and larger than the heat flux of the sixth surface S6. That is, the first surface S1 is formed so that heat is most easily transferred among the six surfaces S1, S2, S3, S4, S5, and S6.

  In the present embodiment, the thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is from the inside of the case 11 to the outside through the second to sixth surfaces S2, S3, S4, S5, and S6. Higher than the total thermal conductivity of the five directions toward. In other words, the heat flux of the first surface S1 is larger than the total heat flux of the remaining five surfaces S2, S3, S4, S5, and S6.

Next, details of the case 11 and the battery cell 12 will be described.
FIG. 3 is a perspective view showing the case 11 and the plurality of battery cells 12. 3 and 4 show a state in which the case 11 is erected so that the third surface S3 of the case 11 faces upward for convenience of explanation.

  As shown in FIG. 3, the case 11 includes a case main body 31 and a cover 32 combined with the case main body 31. In addition to the opening 16, the case main body 31 is formed in a box shape in which the above-described third surface S3 side is opened. Inside the case main body 31, a plurality of accommodating portions 33 in which a plurality of battery cells 12 are individually accommodated are provided. The accommodating portion 33 is formed slightly larger than the outer shape of the battery cell 12. For this reason, a gap in which the battery cell 12 can move exists between the inner surface of the housing portion 33 and the battery cell 12. The case main body 31 has an insulating partition wall 34 that partitions the plurality of accommodating portions 33. In addition, between the some battery cells 12, not only the partition wall 34 but insulation may be ensured by an insulating sheet. On the other hand, the cover 32 is attached to the case body 31 and forms the above-described third surface S3. The cover 32 is provided with a plurality of insertion holes 35 (see FIG. 2) through which the electrode terminals 45a and 45b of the battery cell 12 are passed.

Each battery cell 12 has an upper surface 41, a bottom surface 42, and a peripheral surface 43. The upper surface 41 has electrode terminals 45a and 45b. The bottom surface 42 is located on the side opposite to the top surface 41. The peripheral surface 43 is substantially orthogonal to the upper surface 41 and the bottom surface 42, and extends between the edge portion of the upper surface 41 and the edge portion of the bottom surface 42.
More specifically, the peripheral surface 43 includes a pair of main surfaces 43a and 43b and a pair of side surfaces 43c and 43d. The main surfaces 43 a and 43 b are surfaces having the largest area among the peripheral surfaces 43 of the battery cells 12. The side surfaces 43c and 43d extend between the edges of the main surfaces 43a and 43b. As shown in FIG. 3, the plurality of battery cells 12 are in a state where the main surfaces 43a and 43b of the battery cells 12 face each other, and end portions of the battery cells 12 provided with the electrode terminals 45a and 45b are in the same direction. It is arranged side by side in the direction. In the present embodiment, each battery cell 12 is housed inside the case 11 with one side surface 43c facing the first surface S1 of the case 11.

FIG. 4 is a cross-sectional view showing the inside of the case 11.
Each battery cell 12 is a nonaqueous electrolyte secondary battery such as a lithium ion battery. As shown in FIG. 4, each battery cell 12 is accommodated in a flat box-like container (outer container, cell can) 51 made of metal such as aluminum or aluminum alloy, and a non-aqueous electrolyte in the container 51. An electrode body. The container 51 has a container main body 51a that is open on one side and a lid 51b that is welded to the container main body 51a and closes the opening of the container main body 51a. The electrode body is formed in a flat rectangular shape, for example, by winding a positive electrode plate and a negative electrode plate in a spiral shape with a separator interposed therebetween, and further compressing in a radial direction.

  The electrode terminals 45a and 45b of each battery cell 12 include a positive terminal 45a and a negative terminal 45b. The positive electrode terminal 45 a and the negative electrode terminal 45 b are provided separately at both ends in the longitudinal direction of the lid 51 b and project outside the container 51. The positive electrode and the negative electrode of the electrode body are connected to the positive electrode terminal 45a and the negative electrode terminal 45b, respectively.

  The plurality of battery cells 12 are electrically connected, for example, in series by a plurality of bus bars 53 as conductive members. More specifically, the plurality of battery cells 12 are arranged in the direction in which the positive terminals 45a and the negative terminals 45b of the adjacent battery cells 12 are alternately arranged. Each bus bar 53 is formed of a metal plate made of a conductive material such as aluminum. The bus bar 53 has one end connected to the positive terminal 45 a of the battery cell 12 and the other end connected to the negative terminal 45 b of the adjacent battery cell 12. Thereby, the plurality of battery cells 12 are electrically connected in series. The plurality of battery cells 12 may be electrically connected in parallel. The connection of the bus bar 53 to the electrode terminals 45a and 45b may be welding, screw fastening, or other methods.

Next, the pressing part (elastic part) 60 provided in the battery module 1 will be described in detail.
The pressing part 60 of the present embodiment includes a first pressing part 61, a second pressing part 62, and a third pressing part 63.
As shown in FIG. 4, the first pressing portion 61 is provided on the second surface wall 22 of the case 11 and presses (biases) the battery cell 12 toward the first surface S <b> 1 of the case 11.

  For example, the first pressing portion 61 includes a plurality of first pressing springs 61 a provided integrally with the case 11. The plurality of first pressing springs 61 a are provided integrally with the second surface wall 22 and contact the side surface 43 d of the battery cell 12. Each first pressing spring 61 a is a cantilever spring that is formed in a rectangular plate shape and extends from the second surface wall 22 to the inside of the case 11. The distal end portion (free end portion) of the first pressing spring 61 a protrudes inside the case 11. Further, the plurality of first pressing springs 61 a are arranged at a plurality of locations separated in the direction along the side surface 43 d of the battery cell 12. Thereby, the plurality of first pressing springs 61 a can press a plurality of locations on the side surface 43 d of the battery cell 12.

  As shown in FIG. 4, when the battery cell 12 is accommodated in the accommodating portion 33 of the case 11, the plurality of first pressing springs 61 a are pressed toward the outer side of the case 11 by being pressed by the side surface 43 d of the battery cell 12. Deform. Thereby, the plurality of first pressing springs 61 a apply a pressing force to the battery cell 12. That is, the plurality of first pressing springs 61 a press the side surface 43 d of the battery cell 12 and press the battery cell 12 toward the first surface S <b> 1 of the case 11.

FIG. 5 is a cross-sectional view taken along line F5-F5 of the case 11 shown in FIG.
As shown in FIG. 5, the first pressing portion 61 is provided in each of the plurality of accommodating portions 33. The first pressing springs 61 a provided in the respective housing portions 33 individually press the battery cells 12 toward the first surface S1 of the case 11. For this reason, even if there is a component tolerance among the plurality of battery cells 12, the plurality of first pressing portions 61 direct the plurality of battery cells 12 toward the first surface S1 of the case 11 while absorbing the component tolerance. Can be pressed. Thereby, the plurality of battery cells 12 can be aligned with respect to the first surface S <b> 1 of the case 11.

  As shown in FIG. 4, the second pressing portion 62 is provided on the fourth surface wall 24 of the case 11 and presses (biases) the battery cell 12 toward the inner surface of the third surface wall 23 of the case 11. For example, the second pressing portion 62 includes a plurality of second pressing springs 62 a provided integrally with the fourth surface wall 24 of the case 11. In addition, since the structure of the 2nd press spring 62a is substantially the same as the structure of the 1st press spring 61a, detailed description is abbreviate | omitted. The plurality of second pressing springs 62 a press the bottom surface 42 of the battery cell 12 and press the battery cell 12 toward the inner surface of the third surface wall 23 of the case 11. Thereby, the battery cell 12 is pinched | interposed between the 2nd press spring 62a and the inner surface of the 3rd surface wall 23 of case 11, and a position is settled without backlash.

  As shown in FIG. 5, the third pressing portion 63 is provided on the fifth surface wall 25 and the plurality of partition walls 34 of the case 11, and presses the battery cell 12 toward the adjacent partition wall 34 or the sixth surface wall 26 of the case 11. Do (energize). For example, the third pressing portion 63 includes a plurality of third pressing springs 63 a provided integrally with the fifth surface wall 25 or the partition wall 34 of the case 11. In addition, since the structure of the 3rd press spring 63a is substantially the same as the structure of the 1st press spring 61a, detailed description is abbreviate | omitted. The plurality of third pressing springs 63 a press the main surface 43 a of the battery cell 12 and press the battery cell 12 toward the adjacent partition wall 34 or the inner surface of the sixth surface wall 26 of the case 11. Accordingly, the battery cell 12 is sandwiched between the third pressing spring 63a and the partition wall 34, or between the third pressing spring 63a and the inner surface of the sixth surface wall 26 of the case 11, and the position is determined without rattling.

Next, the heat conductive sheet 13 and the metal member 14 will be described.
As shown in FIG. 2, the heat conductive sheet 13 is attached to the side surface 43 c of the plurality of battery cells 12. The heat conductive sheet 13 contacts the metal container 51 of the plurality of battery cells 12 and is directly thermally connected to the container 51. The heat conductive sheet 13 is an example of a “heat conductive material”. An example of the heat conductive sheet 13 is a sheet in which heat conductive particles are kneaded into an insulating base material, and has an insulating property (electrical insulating property) and high heat conductivity. Further, the heat conductive sheet 13 has flexibility (flexibility), and can absorb the component tolerance included in the plurality of battery cells 12 and can be in close contact with the plurality of battery cells 12. The heat conductive sheet 13 is sandwiched between the plurality of battery cells 12 and the metal member 14, and thermally connects the plurality of battery cells 12 and the metal member 14. The “thermal conductive material” referred to in the present application is not limited to a thermal conductive sheet, and may be a thermal conductive adhesive. In addition, “thermally connected” in the present application means that heat can move between two members.

  The heat conductive sheet 13 has adhesive surfaces on both front and back surfaces, such as a double-sided tape. For example, one surface of the heat conductive sheet 13 is bonded to the plurality of battery cells 12. Further, the other surface of the heat conductive sheet 13 is bonded to a metal member 14 described later. That is, the metal member 14 may be fixed to the case 11 by being bonded to the battery cell 12 by the heat conductive sheet 13. Instead of this, the metal member 14 may be fixed to the case 11 by an engaging portion such as a snap fit. In this case, as shown in FIG. 2, the metal member 14 is provided with a first engagement portion 65 including a claw portion. In addition, the case 11 may be provided with a second engaging portion 66 that receives the first engaging portion 65. The metal member 14 is fixed to the case 11 by the first engagement portion 65 engaging the second engagement portion 66.

  As shown in FIG. 2, the metal member 14 is a metal plate that covers the first surface S <b> 1 of the case 11. The metal member 14 faces the first surface S <b> 1 of the case 11 and covers a part of the opening 16. In the present embodiment, the metal member 14 has a larger area than the first surface S <b> 1 of the case 11 and covers the entire opening 16. As shown in FIG. 4, the metal member 14 contacts the heat conductive sheet 13 from the side opposite to the plurality of battery cells 12. The metal member 14 is thermally connected to the plurality of battery cells 12 via the heat conductive sheet 13. The material of the metal member 14 is preferably a metal material having high thermal conductivity such as a copper alloy, an aluminum alloy, or a magnesium alloy, but the material is not particularly limited as long as it is a metal.

  In the present embodiment, the first pressing portion 61 presses the plurality of battery cells 12 toward the heat conductive sheet 13 and the metal member 14. Thereby, even when component tolerance is included between the plurality of battery cells 12, the plurality of battery cells 12 and the heat conductive sheet 13 are in close contact with each other, and the heat conductive sheet 13 and the metal member 14 are in close contact with each other. As a result, the thermal connection between the plurality of battery cells 12 and the metal member 14 is strengthened.

  As shown in FIG. 2, in the present embodiment, the case 11 is arranged with the first surface S1 facing upward. The metal member 14 is a metal tray that is provided above the case 11 and on which the second battery module 2 can be placed. The metal member 14 includes, for example, a mounting surface 14a formed in a planar shape, and an upright portion 14b that rises upward from a peripheral end portion of the mounting surface 14a. According to such a metal member 14, the module mounted on the mounting surface 14a is easily held stably.

  In this embodiment, the 2nd battery module 2 is mounted from the upper direction with respect to the mounting surface 14a of the metal member 14, for example, contacts the metal member 14 with the dead weight of this 2nd battery module 2. Moreover, in this embodiment, the fixing member 3 which fixes the 1st battery module 1 and the 2nd battery module 2 is provided. The fixing member 3 presses the second battery module 2 toward the metal member 14 to bring the second battery module 2 and the metal member 14 into close contact with each other. Thereby, the plurality of battery cells 12 of the first battery module 1 are thermally connected to the second battery module 2 through the first surface S1 of the case 11. That is, the plurality of battery cells 12 are thermally and firmly connected to the second battery module 2 via the heat conductive sheet 13 and the metal member 14.

Next, the operation of the battery unit U will be described.
In the present embodiment, the battery cells 12 included in the first battery module 1 are thermally connected to the second battery module 2 via the heat conductive sheet 13 and the metal member 14. Here, the second battery module 2 has a different use from the first battery module 1 and has a different discharge timing (that is, a heat generation timing). For this reason, at the timing when the first battery module 1 discharges and generates heat, the second battery module 2 does not generate heat and is often relatively cold. For this reason, when the battery cell 12 generates heat, part of the heat generated by the battery cell 12 is also diffused into the second battery module 2, and the heat is released from the second battery module 2 into the atmosphere. That is, in this embodiment, the 2nd battery module 2 provided for another use is functioned as a thermal radiation member, and, thereby, the thermal radiation of the battery cell 12 is accelerated | stimulated.
Further, in the present embodiment, the metal container 51 of the plurality of battery cells 12 included in the first battery module 1 does not go through the synthetic resin case 11 and has a heat conductivity better than that of the case 11. It is thermally connected to the second battery module 2 via the sheet 13 and the metal member 14. For this reason, compared with the case where the synthetic resin case 11 exists in between, the heat easily moves from the metal container 51 of the battery cell 12 to the second battery module 2. For this reason, the heat dissipation of the battery cell 12 is further effectively promoted.

According to the battery module 1 having the above configuration, it is possible to improve heat dissipation. That is, the battery module 1 of the present embodiment includes the battery cell 12, the case 11, and the first pressing portion 61. The case 11 accommodates the secondary battery cell 12, and has a first surface S1 and a second surface S2 facing in a direction different from the first surface S1. The 1st press part 61 presses the battery cell 12 toward 1st surface S1. The thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is higher than the thermal conductivity in the direction from the inside of the case 11 to the outside through the second surface S2.
According to such a configuration, the thermal conductivity of the first surface S1 of the case 11 is formed better than other surfaces (for example, the second surface S2), and the first surface S1 is formed on the second battery module 2. By arrange | positioning toward, the battery cell 12 and the 2nd battery module 2 can be connected thermally favorable. Further, by pressing the battery cell 12 toward the first surface S1 by the first pressing portion 61, the adhesion between the battery cell 12 and the second battery module 2 can be improved, and the contact thermal resistance can be reduced. it can. Thereby, the heat dissipation of the battery module 1 can be improved.

In the present embodiment, the heat flux of the first surface S1 is larger than any one of the remaining five surfaces S2, S3, S4, S5, and S6.
According to such a configuration, in the box-shaped case 11 having six surfaces, the heat generated by the battery cells 12 can be moved to the second battery module 2 through the first surface S1 having good thermal conductivity. Thereby, the further improvement of the heat dissipation of the battery module 1 can be aimed at.

In the present embodiment, the heat flux of the first surface S1 is larger than any of the remaining five surfaces S2, S3, S4, S5, and S6.
According to such a configuration, the heat generated by the battery cell 12 can be transferred to the second battery module 2 through the first surface S <b> 1 having the best thermal conductivity among all the surfaces of the case 11. Thereby, the further improvement of the heat dissipation of the battery module 1 can be aimed at.

In the present embodiment, the heat flux of the first surface S1 is larger than the total heat flux of the remaining five surfaces S2, S3, S4, S5, and S6.
According to such a configuration, the heat generated by the battery cell 12 is transferred to the second battery module 2 through the first surface S1 having better thermal conductivity than the total of the remaining five surfaces S2, S3, S4, S5, and S6. Can be made. Thereby, the further improvement of the heat dissipation of the battery module 1 can be aimed at.

In the present embodiment, the first surface S1 has an opening 16 through which at least a part of the battery cell 12 can be exposed.
According to such a configuration, at least a part of the battery cell 12 is exposed to the outside of the case 11 through the opening 16. For this reason, the heat generated by the battery cell 12 can be guided to the outside of the case 11 without passing through the case 11 made of synthetic resin. For example, in this embodiment, the battery cell 12 and the 2nd battery module 2 can be thermally connected by the heat conductive sheet 13 and the metal member 14 with favorable heat conductivity. Thereby, the further improvement of the heat dissipation of the battery module 1 can be aimed at.

In the present embodiment, the case 11 accommodates a plurality of battery cells 12. The opening 16 can expose at least a part of each of the plurality of battery cells 12.
According to such a configuration, heat generated by the plurality of battery cells 12 can be guided to the outside of the case 11 through the relatively large opening 16. Thereby, the further improvement of the heat dissipation of the battery module 1 can be aimed at.

In the present embodiment, the battery module 1 includes a metal member 14. The metal member 14 covers at least a part of the opening 16 and is thermally connected to the battery cell 12.
According to such a structure, the battery cell 12 and the 2nd battery module 2 can be thermally connected by the metal member 14 with favorable thermal conductivity. In addition, the metal member 14 has higher rigidity than a synthetic resin member. For this reason, the rigidity of the case 11 which falls by providing the opening part 16 can also be supplemented by providing the metal member 14.

In the present embodiment, the battery module 1 includes an insulating heat conductive material (for example, a heat conductive sheet 13). The heat conductive material is disposed between the battery cell 12 and the metal member 14 and thermally connects the battery cell 12 and the metal member 14.
According to such a structure, the insulation between battery cells 12 is ensured, and it can avoid that battery cells 12 short-circuit. Further, when the heat conductive material has flexibility, it is possible to absorb the component tolerance included in the battery cell 12 and improve the adhesion between the battery cell 12 and the heat conductive material.

  Here, the lifetime of the 1st battery module 1 containing the battery cell 12 is comparatively long, for example, is about 10 years. Compared with this, the lifetime of the 2nd battery module 2 which is a lead battery, for example is about 3 years. For this reason, while the 1st battery module 1 is used, the 2nd battery module 2 needs replacement | exchange several times.

Therefore, in the present embodiment, the case 11 is arranged with the opening 16 facing upward. The metal member 14 is a metal tray that is provided above the case 11 and on which another module (for example, the second battery module 2) can be placed.
According to such a configuration, since the second battery module 2 is positioned above the first battery module 1, only the second battery module 2 is replaced while maintaining the state of the first battery module 1. Cheap. Thereby, the battery unit U with easy replacement | exchange operation | work can be provided. When the second battery module 2 is positioned above the first battery module 1, the adhesion between the second battery module 2 and the metal member 14, the heat conduction with the metal member 14 due to the weight of the second battery module 2. The adhesion between the sheet 13 and the adhesion between the heat conductive sheet 13 and the battery cell 12 can be enhanced. Thereby, the heat dissipation of the 1st battery module 1 tends to become still better. Further, when the second battery module 2 is disposed above the first battery module 1, the first battery module 1 is positioned behind the second battery module 2, so that the first battery module 1 is warmed by sunlight or the like. Hateful. For this reason, the heat dissipation of the 1st battery module 1 is further easy to be ensured.

  In contrast to the configuration of the above embodiment, the first battery module 1 may be disposed above the second battery module 2. In this case, since the load by the weight of the 2nd battery module 2 does not act with respect to the 1st press spring 61a of the 1st battery module 1, the 1st press spring 61a becomes difficult to deteriorate.

In the present embodiment, the case 11 is arranged with the first surface S1 facing the second battery module 2 (lead battery module). The battery cell 12 is thermally connected to the second battery module 2 through the first surface S1.
According to such a structure, the heat dissipation of the 1st battery module 1 can be improved using the other battery module 2 used in combination with the 1st battery module 1. FIG. For this reason, the size and cost of the 1st battery module 1 can be held down compared with the case where additional parts only for heat dissipation are provided.

(Modification of the first embodiment)
Next, with reference to FIG. 6, the battery module 1 of the modification of 1st Embodiment is demonstrated.
This modification is different from the first embodiment in the configuration of the pressing portion 60. The remaining configuration of this modification is the same as that of the first embodiment.

  As shown in FIG. 6, the pressing portion 60 of this modification is formed by a foam coating layer 71 provided on the inner surface of the case 11. The foam coating layer 71 is formed to have a predetermined thickness, for example, about 300 μm to 1 mm, by applying foam paint to the inner surface of the case 11. For example, after a temperature foam paint or a humidity foam paint is applied to the inner surface of the case 11 in advance, the foaming agent in the foam paint is foamed by applying a certain temperature or humidity to the foam paint, and includes a large number of independent bubbles. A foam coating layer 71 is formed. The foaming ratio of the foamed paint can be adjusted by adjusting the temperature or humidity applied to the foamed paint. The foam coating layer 71 can be adjusted in repulsive force by a large number of closed cells. The foam coating layer 71 can press and fix the position of the battery cell 12 by the frictional force and the compression repulsion force of the bubbles. The foamed paint as described above contains, for example, expandable particles and a binder resin.

The pressing part 60 of the present modification includes a first pressing part 61, a second pressing part 62, and a third pressing part 63, as in the first embodiment.
The first pressing portion 61 is formed by a foam coating layer 71 provided on the inner surface of the second surface wall 22 of the case 11. When the battery cell 12 is accommodated in the accommodating portion 33 of the case 11, the foam coating layer 71 of the first pressing portion 61 is pushed by the side surface 43 d of the battery cell 12 and elastically deforms toward the outside of the case 11. Thereby, the foam coating layer 71 of the first pressing portion 61 applies a pressing force to the battery cell 12. That is, the foam coating layer 71 of the first pressing portion 61 presses the side surface 43 d of the battery cell 12 and presses the battery cell 12 toward the first surface S 1 of the case 11.

  The second pressing portion 62 is formed by the foam coating layer 71 provided on the inner surface of the fourth surface wall 24 of the case 11. The second pressing portion 62 presses the bottom surface 42 of the battery cell 12 and presses the battery cell 12 toward the inner surface of the third surface wall 23 of the case 11. Thereby, the battery cell 12 is pinched | interposed between the 2nd press part 62 and the inner surface of the 3rd surface wall 23 of case 11, and a position is settled without rattling.

  The third pressing portion 63 is formed by the foam coating layer 71 provided on the partition wall 34 and the fifth surface wall 25 of the case 11. The third pressing portion 63 presses the battery cell 12 toward the partition wall 34 or the inner surface of the sixth surface wall 26 of the case 11. Thereby, the battery cell 12 is pinched | interposed between the 3rd press part 63 and the partition 34 or between the 3rd press part 63 and the inner surface of the 6th surface wall 26 of the case 11, and a position is settled without backlash.

  Also by such a press part 60, the several battery cell 12 can be aligned with respect to 1st surface S1 of case 11 similarly to 1st Embodiment. Moreover, the adhesiveness between the battery cell 12 and the heat conductive sheet 13 and the adhesiveness between the heat conductive sheet 13 and the metal member 14 can be enhanced by the pressing portion 60. Note that this modification is applicable to all embodiments described below.

(Second Embodiment)
Next, the battery module 1 of 2nd Embodiment is demonstrated with reference to FIG. 7 and FIG. The present embodiment is different from the first embodiment in that the heat conductive sheet 13 and the metal member 14 are not provided. The remaining configuration of the present embodiment is the same as that of the first embodiment. Therefore, description of the same part as 1st Embodiment is abbreviate | omitted.
Further, in the embodiment described below including this embodiment, the battery module 1 that is used with the first surface S1 of the case 11 facing sideways will be described. In all the following embodiments, the battery module 1 may be used with the first surface S1 facing upward or downward, as in the first embodiment. Moreover, the battery module 1 of the first embodiment may be used with the first surface S1 of the case 11 facing sideways, similarly to the battery module 1 of the present embodiment.

FIG. 7 is a perspective view showing the battery module 1 of the present embodiment.
In the present embodiment, an opening 16 is provided in the first surface S1 of the case 11 as in the first embodiment. In this embodiment, the heat conductive sheet 13 and the metal member 14 are not provided. The opening 16 exposes the side surfaces 43 c of the plurality of battery cells 12 to the outside of the case 11.

FIG. 8 is a cross-sectional view of the battery module 1 shown in FIG.
As shown in FIG. 8, in the present embodiment, the plurality of battery cells 12 are in direct contact with the second battery module 2 through the openings 16 in the first surface S1. Thereby, the plurality of battery cells 12 are directly thermally connected to the second battery module 2. The first pressing part 61 presses the plurality of battery cells 12 toward the second battery module 2. Thereby, the component tolerance contained between the plurality of battery cells 12 is absorbed, and the plurality of battery cells 12 and the second battery module 2 are thermally and firmly connected.

According to such a configuration, the heat dissipation of the battery module 1 can be improved as in the first embodiment.
In the configuration of the present embodiment, only the heat conductive material (for example, the heat conductive sheet 13) may be provided between the plurality of battery cells 12 and the second battery module 2. In other words, the plurality of battery cells 12 may be connected to the second battery module 2 not through the metal member 14 but only through the heat conductive material. Moreover, only the metal member (for example, metal plate) 14 may be provided between the plurality of battery cells 12 and the second battery module 2. That is, the plurality of battery cells 12 may be connected to the second battery module 2 only through the metal member 14 without using a heat conductive material.

(Third embodiment)
Next, the battery module 1 of 3rd Embodiment is demonstrated with reference to FIG. 9 and FIG. This embodiment is different from the second embodiment in that a position restricting portion 76 that restricts the position of the battery cell 12 is provided. The remaining configuration of this embodiment is the same as that of the second embodiment. Therefore, the description of the same part as in the second embodiment is omitted.

FIG. 9 is a perspective view showing the battery module 1 of the present embodiment.
As shown in FIG. 9, an opening 16 is provided in the first surface S <b> 1 of the case 11. However, the opening 16 of the present embodiment is smaller than the size of the first surface S1. The first surface S1 of the case 11 is a position restricting portion that restricts the position of the battery cell 12 between the edge of the opening 16 and the third surface S3 and between the edge of the opening 16 and the fourth surface S4. 76. The position restricting portion 76 is formed by a part of the case 11.

FIG. 10 is a cross-sectional view of the battery module 1 shown in FIG.
As shown in FIG. 10, the position restricting portion 76 faces the plurality of battery cells 12 from the side opposite to the first pressing portion 61. The position restricting portion 76 is in contact with each side surface 43 c of the plurality of battery cells 12. The position restricting portion 76 restricts the position of the battery cell 12 so that the battery cell 12 pressed from the first pressing portion 61 does not jump out of the case 11.

  As shown in FIG. 10, a heat conductive sheet 13 as an example of a heat conductive material is disposed on the inner peripheral side of the opening 16. That is, in the present embodiment, the heat conductive sheet 13 is inserted into the opening 16. The thickness T1 of the heat conductive sheet 13 in the direction from the first pressing portion 61 toward the position restricting portion 76 (hereinafter referred to as X direction) is the thickness T2 of the position restricting portion 76 in the X direction (that is, in the X direction). It is thicker than the thickness of the opening 16. For this reason, the heat conductive sheet 13 is in contact with the plurality of battery cells 12 and protrudes outside the case 11 from the first surface S1. The heat conductive sheet 13 can be elastically deformed between the battery cell 12 and the second battery module 2. The second battery module 2 may be in contact with the first surface S1 of the case 11 by elastically deforming the heat conductive sheet 13.

  In the present embodiment, the metal member 14 is not provided. The heat conductive sheet 13 is in direct contact with the second battery module 2. Accordingly, the plurality of battery cells 12 are thermally connected to the second battery module 2 via the heat conductive sheet 13. The first pressing unit 61 presses the plurality of battery cells 12 toward the heat conductive sheet 13 and the second battery module 2.

  According to such a configuration, the heat dissipation of the battery module 1 can be improved as in the first embodiment. Further, in the present embodiment, the case 11 has a position restricting portion 76 that faces the plurality of battery cells 12 from the side opposite to the first pressing portion 61. When the position restricting portion 76 is provided, the position of the battery cell 12 is further stabilized when the battery module 1 is assembled. For this reason, the assemblability of the battery module 1 is improved.

  FIG. 11 shows a modification of the present embodiment. As shown in FIG. 11, in this modification, a metal member 14 is provided between the heat conductive sheet 13 and the second battery module 2. For example, at least a part of the metal member 14 is disposed on the inner peripheral side of the opening 16. That is, in the present embodiment, at least a part of the metal member 14 is inserted into the opening 16. In this case, the total value of the thickness T1 of the heat conductive sheet 13 in the X direction and the thickness T3 of the metal member 14 is the thickness T2 of the position restricting portion 76 in the X direction (that is, the thickness of the opening 16 in the X direction). Thickness is better. Even with such a configuration, the heat dissipation of the battery module 1 can be improved as in the third embodiment.

(Fourth embodiment)
Next, with reference to FIG. 12, the battery module 1 of 4th Embodiment is demonstrated. This embodiment is different from the second embodiment in that the opening 16 is not provided in the first surface S1 of the case 11. The remaining configuration of this embodiment is the same as that of the second embodiment. Therefore, the description of the same part as in the second embodiment is omitted.

  As shown in FIG. 12, the first surface S <b> 1 of the case 11 of this embodiment does not have the opening 16. The first surface S1 of the case 11 has a first surface wall 81 made of synthetic resin. The 1st surface wall 81 has the same function as the position control part 76 of 3rd Embodiment. That is, the first face wall 81 regulates the position of the battery cell 12 so that the battery cell 12 pressed from the first pressing portion 61 does not jump out of the case 11.

  In the present embodiment, the thickness Ta1 of the first surface wall 81 in the direction from the inside of the case 11 to the outside is thinner than the thickness Ta2 of the second surface wall 22 in the direction from the inside of the case 11 to the outside. In the present embodiment, since the first surface wall 81 is formed thinner than the second surface wall 22, the thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is the case 11 through the second surface S2. It is higher than the thermal conductivity in the direction from the inside to the outside.

  Furthermore, in this embodiment, the thickness Ta1 of the first surface wall 81 is the thickness Ta2 of the second surface wall 22, the thickness Ta3 of the third surface wall 23, and the fourth in the direction from the inside to the outside of the case 11, respectively. It is thinner than the thickness Ta4 of the face wall 24, the thickness of the fifth face wall 25, and the thickness of the sixth face wall 26. Therefore, the thermal conductivity in the direction from the inside of the case 11 to the outside through the first surface S1 is the respective direction from the inside of the case 11 to the outside through the remaining five surfaces S2, S3, S4, S5, S6 of the case 11. Higher than the thermal conductivity.

  In the present embodiment, the plurality of battery cells 12 are thermally connected to the second battery module 2 via the first face wall 81. A metal member 14 may be provided between the first face wall 81 and the second battery module 2. For example, the metal member 14 is fixed to the case 11 and contacts the first surface wall 81. By providing the metal member 14, it is possible to compensate for the rigidity of the case 11 that is lowered by forming the first face wall 81 thin.

  According to such a configuration, the heat dissipation of the battery module 1 can be improved as in the first embodiment.

(Fifth embodiment)
Next, with reference to FIG. 13, the battery module 1 of 5th Embodiment is demonstrated. This embodiment is different from the second embodiment in that a plurality of first battery modules 1 are separately arranged around the second battery module 2. In addition, the other structure of this embodiment is the same as that of the structure of 2nd Embodiment. Therefore, the description of the same part as in the second embodiment is omitted.

  As shown in FIG. 13, the battery unit U of the present embodiment includes a plurality of (for example, four) first battery modules 1 arranged so as to surround the second battery module 2 formed in a rectangular box shape. Each first battery module 1 is arranged with the first surface S <b> 1 provided with the opening 16 facing the second battery module 2. For example, the plurality of first battery modules 1 are bound and fixed to the second battery module 2 by the fixing member 3 as shown in the first embodiment. Or the some 1st battery module 1 and the 2nd battery module 2 are collectively accommodated in the housing | casing 85 which covers these outer sides.

  Each battery module 1 is thermally connected to the second battery module 2 through the first surface S1. In each battery module 1, the battery cell 12 may be directly thermally connected to the second battery module 2, as in the second embodiment. Moreover, between each battery module 1 and the 2nd battery module 2, at least one of the above heat conductive materials and the metal member 14 may be provided. The first surface S1 of the case 11 is not limited to the one provided with the opening 16, and may have a relatively thin first surface wall 81 as in the fourth embodiment.

  As shown in FIG. 13, in each battery module 1 of the present embodiment, one or two battery cells 12 are accommodated in a case 11. The battery cell 12 is arranged with the main surface (long side surface) 43a having the largest area among the peripheral surfaces 43 of the battery cell 12 facing the first surface S1 of the case 11. The battery cell 12 is thermally connected to the second battery module 2 through the main surface 43a.

  According to such a configuration, the heat dissipation of the battery module 1 can be improved as in the first embodiment. In the present embodiment, the battery cell 12 is arranged with the main surface 43a having the largest area among the peripheral surfaces 43 of the battery cell 12 facing the first surface S1 of the case 11. According to such a configuration, the thermal contact area between the battery cell 12 and the second battery module 2 increases. Thereby, the further improvement of the heat dissipation of the battery module 1 can be aimed at.

(Sixth embodiment)
Next, the battery module 1 of 6th Embodiment is demonstrated with reference to FIG. This embodiment is different from the second embodiment in that the battery module 1 is mounted on the battery device 91. In addition, the other structure of this embodiment is the same as that of the structure of 2nd Embodiment. Therefore, the description of the same part as in the second embodiment is omitted.

  As shown in FIG. 14, in the present embodiment, a plurality of battery modules 1 are mounted on a battery device 91. The battery device 91 is a so-called battery panel or battery pack. The battery device 91 has a metal shelf 92 on which the battery module 1 is mounted. The shelf board 92 is an example of a “battery housing part”. The upper surface of the shelf plate 92 forms a placement surface 92a on which the battery module 1 is placed.

  In the present embodiment, the case 11 of the battery module 1 is arranged with the first surface S <b> 1 facing the mounting surface 92 a of the battery device 91. The battery cell 12 is thermally connected to the battery device 91 through the first surface S1 of the case 11. In the present embodiment, the battery cell 12 is thermally connected to the shelf plate 92 via the heat conductive sheet 13 and the metal member 14. The battery cell 12 may be in direct contact with, for example, the shelf plate 92 without passing through at least one of the heat conductive material and the metal member 14. In this case, an insulating sheet is sandwiched between the battery cell 12 and the shelf plate 92.

  According to such a structure, the heat dissipation of the battery module 1 can be improved using the battery accommodating part (for example, shelf board 92) in which the battery module 1 is mounted. For this reason, the size and cost of the battery module 1 can be suppressed compared with the case where an additional component dedicated to heat dissipation is provided.

(Seventh embodiment)
Next, a battery module 1 according to a seventh embodiment will be described with reference to FIG. This embodiment is different from the second embodiment in that the battery cell 12 is accommodated in the recess 95 provided in the second battery module 2. In addition, the other structure of this embodiment is the same as that of the structure of 2nd Embodiment. Therefore, the description of the same part as in the second embodiment is omitted.

As shown in FIG. 15, the second battery module 2 is provided with a plurality of recesses (pockets) 95 corresponding to the outer shape of the battery cell 12. The plurality of battery cells 12 of the first battery module 1 are divided into a plurality of recesses 95 and inserted into the plurality of recesses 95. A heat conductive material such as the heat conductive sheet 13 or a heat conductive adhesive may be provided between the inner surface of the recess 95 and the peripheral surface 43 and the bottom surface 42 of the battery cell 12. When such a heat conductive material is provided, the backlash of the battery cell 12 with respect to the concave portion 95 can be suppressed, and the peripheral surface 43 and the bottom surface 42 of the battery cell 12 are thermally strengthened to the second battery module 2. Can be connected.
According to such a structure, the heat dissipation of the battery cell 12 can be improved.

As mentioned above, although several embodiment and the battery module 1 of the modification were demonstrated, embodiment is not limited to the said example. For example, the plurality of embodiments and modifications described above can be applied in combination with each other. For example, in the second to seventh embodiments, the battery module 1 may be in close contact with another module (for example, the second battery module 2) by the fixing member 3.
Further, the heat dissipation member to which the first surface S1 of the battery module 1 is thermally connected is not limited to the second battery module 2 and the battery device 91. The first surface S1 of the battery module 1 may be thermally connected to a member dedicated to heat dissipation (for example, a heat sink), or may be thermally connected to another type of member.
The opening 16 provided in the first surface S1 is not limited to the one that exposes the entire side surface 43c or the main surface 43a of the battery cell 12. The opening 16 may be a relatively small one that exposes a part of the surface of the battery cell 12.

  According to at least one embodiment described above, the battery module includes a secondary battery cell, a case, and a pressing portion. The case accommodates the secondary battery cell, and has a first surface and a second surface facing in a direction different from the first surface. The pressing portion presses the secondary battery cell toward the first surface. The thermal conductivity in the direction from the inside of the case to the outside through the first surface is higher than the thermal conductivity in the direction from the inside of the case to the outside through the second surface. According to such a structure, the heat dissipation of a battery module can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... 1st battery module (battery module), 2 ... 2nd battery module (lead battery module), 11 ... Case, 12 ... Battery cell (secondary battery cell), 13 ... Thermal conductive sheet (thermal conductive material), 14 DESCRIPTION OF SYMBOLS ... Metal member, 16 ... Opening part, S1 ... 1st surface, S2 ... 2nd surface, 61 ... 1st press part, 91 ... Battery apparatus.

Claims (12)

A secondary battery cell;
A case having the secondary battery cell and having a first surface and a second surface facing in a direction different from the first surface;
A pressing portion that presses the secondary battery cell toward the first surface;
With
The thermal conductivity in the direction from the inside of the case to the outside through the first surface is higher than the thermal conductivity in the direction from the inside of the case to the outside through the second surface.
Battery module. The case is formed in a box shape having six surfaces including the first surface and the second surface,
The heat flux of the first surface is larger than any one of the remaining five surfaces included in the six surfaces,
The battery module according to claim 1. The heat flux of the first surface is larger than any one of the remaining five surfaces included in the six surfaces,
The battery module according to claim 2. The heat flux of the first surface is larger than the total heat flux of the remaining five surfaces included in the six surfaces.
The battery module according to claim 2 or claim 3. The first surface has an opening capable of exposing at least a part of the secondary battery cell.
The battery module according to any one of claims 1 to 4. The case houses a plurality of the secondary battery cells,
The opening can expose at least a part of each of the plurality of secondary battery cells.
The battery module according to claim 5. A metal member that covers at least a portion of the opening and is thermally connected to the secondary battery cell;
The battery module according to claim 5 or 6. An insulating heat conductive material that is disposed between the secondary battery cell and the metal member and thermally connects the secondary battery cell and the metal member;
The battery module according to claim 7. The case is arranged with the opening facing upward,
The metal member is a metal tray provided above the case and on which other modules can be placed.
The battery module according to claim 7 or 8. The secondary battery cell is arranged with the surface having the largest area among the peripheral surfaces of the secondary battery cell facing the first surface of the case.
The battery module according to any one of claims 1 to 9. The case is arranged with the first surface facing the lead battery module,
The secondary battery cell is thermally connected to the lead battery module through the first surface.
The battery module as described in any one of Claims 1-10. The case is arranged with the first surface facing a mounting surface of a battery device on which a plurality of battery modules are mounted,
The secondary battery cell is thermally connected to the battery device through the first surface.
The battery module as described in any one of Claims 1-10.

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