Power storage device module

Abstract

The invention provides a power storage device module capable of reducing heat conduction from a power storage device to a clamping component and suppressing heat transfer to an adjacent power storage device through the clamping component. A power storage device module (500) is provided with a plurality of power storage devices (1) arranged in a row, and an interposing member (520) interposed between the power storage devices (1), each power storage device (1) is provided with an electrode body (40) and a metal case (10) that houses the electrode body (40), and the case outer surface (11) of the case (10) includes contact parts (21, 22) that come into contact with the interposing member (520). Furthermore, the contact parts (21, 22) include top contact parts (23, 24) having a plurality of protrusions (11t), and the tops (11tp) of the protrusions (11t) are in contact with the interposing member (520), thereby reducing the contact areas (Sta, Stb) between the top contact parts (23, 24) and the interposing member (520).

Description

Technical Field

[0001] The present invention relates to a power storage device module in which a plurality of power storage devices are arranged in a row via sandwiching members. Background Art

[0002] Conventionally, a battery module in which a plurality of batteries are arranged in a row via sandwiching members made of resin or the like is known. As related prior art, for example, Patent Document 1 can be cited.

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2018-32581

[0004] In such a battery module, when a certain battery generates heat, since the heat of the heat-generating battery is transmitted to adjacent batteries via the sandwiching member, the temperature of the adjacent battery also rises. Summary of the Invention

[0005] The present invention has been completed in view of this situation, and provides a power storage device module capable of reducing heat conduction from the housing of the power storage device to the sandwiching member and suppressing heat from being transmitted to adjacent power storage devices via the sandwiching member.

[0006] (1) One aspect of the present invention for solving the above problems is a power storage device module, which includes: a plurality of power storage devices arranged in a row; and a sandwiching member sandwiched between adjacent power storage devices. Each power storage device includes an electrode body and a metal housing that houses the electrode body. The housing has a housing outer surface exposed to the outside, and the housing outer surface includes a contact portion that contacts the sandwiching member. The contact portion of the housing outer surface includes a top contact portion having a plurality of convex portions, and the tops of these convex portions contact the sandwiching member, so that the contact area between the top contact portion and the sandwiching member is reduced compared to the case where the top contact portion is flat without the convex portions.

[0007] In the power storage device module, the contact portion of the housing outer surface of the power storage device includes a top contact portion in which the contact area with the sandwiching member is reduced by a plurality of convex portions (the top contact portion in which the contact area with the sandwiching member is reduced compared to the flat area of the top contact portion, that is, the flat area of the top contact portion in the case where the top contact portion does not have convex portions), so that the contact portion of the power storage device contacts the sandwiching member with a small area. Therefore, compared with the case where the contact portion of the power storage device does not have the top contact portion, heat conduction from the contact portion of the power storage device to the sandwiching member can be reduced. Thus, when a certain power storage device generates heat, it is possible to suppress the heat from being transmitted to adjacent power storage devices via the sandwiching member, thereby suppressing a temperature rise of the adjacent power storage device.

[0008] In addition, examples of the "power storage device" include secondary batteries such as lithium-ion secondary batteries, sodium-ion secondary batteries, and calcium-ion secondary batteries, and capacitors such as lithium-ion capacitors.

[0009] The "top contact portion" can be formed, for example, by the following method. That is, the top contact portion having a plurality of convex portions can be formed by performing physical surface roughening treatment such as shot peening, sandblasting, or metal spraying on the contact portion of the outer surface of the housing, or chemical surface roughening treatment based on anodic oxidation, chemical etching, etc., or surface roughening treatment for forming nano-level convex portions using pulsed laser. Alternatively, the top contact portion having a plurality of convex portions can also be formed by stamping.

[0010] In addition, the top contact portion can be formed only on a part of the contact portion of the outer surface of the housing, or can be formed on the entire contact portion. In addition, a plurality of convex portions identical to the plurality of convex portions of the top contact portion can also be formed on a portion of the outer surface of the housing other than the contact portion.

[0011] Examples of the "clamping member" include clamping members made of resin or metal. Alternatively, a clamping member made of an elastomer such as rubber or a highly elastic body can also be used. That is, the portion of the clamping member that abuts against the top contact portion has a hardness such that it can suppress deformation such as denting in a manner covering the top of the convex portion due to the top contact of the convex portion, thereby increasing the contact area with the convex portion. In addition, the clamping members disposed between adjacent power storage devices can be single or multiple.

[0012] In addition, examples of the form of the clamping member include a plate-shaped clamping member, a clamping member having a plate-shaped clamping main body portion and a clamping convex portion that protrudes from the clamping main body portion toward the contact portion of the power storage device and contacts the contact portion. In the latter clamping member, by clamping the clamping convex portion between the clamping main body portion and the power storage device, a cooling path through which a cooling medium such as cooling air can flow can be formed between the clamping main body portion and the power storage device.

[0013] (2) The power storage device module described in (1) can be a power storage device module having a plurality of the above convex portions only on the above contact portion of the above outer surface of the housing.

[0014] In the above power storage device module, since a plurality of convex portions may not be provided on a portion of the outer surface of the housing other than the contact portion, it is possible to ensure heat insulation from the clamping member while being an inexpensive power storage device and an inexpensive power storage device module.

[0015] (3) The power storage device module described in (1) may be the following power storage device module, that is, the clamping member has: a clamping main body portion disposed between adjacent power storage devices; and a clamping convex portion that protrudes from the clamping main body portion toward the contact portion of at least one of the power storage devices and contacts the contact portion. The outer surface of the housing of the power storage device, in addition to the contact portion, further includes a separated and opposed portion that is separated from and opposed to the clamping main body portion and forms a cooling path therebetween with the clamping main body portion. The separated and opposed portion also has a plurality of convex portions, and these convex portions increase the surface area of the separated and opposed portion facing the cooling path compared to the case where the convex portions are not provided on the separated and opposed portion and it becomes flat.

[0016] In the above power storage device module, a cooling path through which a cooling medium such as cooling air flows is formed between the clamping main body portion of the clamping member and the separated and opposed portion of the outer surface of the housing of the power storage device, and a plurality of convex portions are also provided on the separated and opposed portion. The plurality of convex portions provided on the separated and opposed portion have the same shape as the plurality of convex portions of the contact portion, but different functions. That is, the plurality of convex portions of the separated and opposed portion increase the surface area facing the cooling path (increase the surface area of the separated and opposed portion compared to the surface area when the convex portions are not provided on the separated and opposed portion and it becomes flat, that is, the flat area of the separated and opposed portion), and can efficiently dissipate the heat of the power storage device through the separated and opposed portion. Therefore, in the above power storage device module, on the one hand, at the contact portion of the outer surface of the housing, heat transfer of the power storage device to an adjacent power storage device can be suppressed (heat insulation of the power storage device), and on the other hand, at the separated and opposed portion, heat of the power storage device can be efficiently dissipated.

[0017] In addition, since the plurality of convex portions of the contact portion and the plurality of convex portions of the separated and opposed portion have the same shape, there is also an advantage that they can be formed together by the same method when forming the plurality of convex portions on the outer surface of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view of a battery constituting the battery module according to Embodiment 1.

[0019] Figure 2 Relating to Embodiment 1, it is a side view of the first wide side surface of the battery.

[0020] Figure 3 Relating to Embodiment 1, it is a side view of the second wide side surface of the battery.

[0021] Figure 4 It is a partial cross-sectional view along the up-down direction and the column arrangement direction of the battery module according to Embodiment 1.

[0022] Figure 5is a partial cross-sectional view showing an enlarged view of part A in the battery module according to Embodiment 1 Figure 4 in

[0023] Figure 6 is a partial cross-sectional view along the vertical direction and the juxtaposition direction of the battery module according to Embodiment 2

[0024] Figure 7 is a partial cross-sectional view showing an enlarged view of part B in the battery module according to Embodiment 2 Figure 6 in

[0025] Figure 8 is a partial cross-sectional view along the vertical direction and the juxtaposition direction of the battery module according to Embodiment 3

[0026] Explanation of reference numerals:

[0027] 1, 100... battery (power storage device); 10... housing; 11... outer surface of the housing; 11t... convex portion; 11tp... top (of the convex portion); 21, 121... first contact portion; 22... second contact portion; 23, 123... first top abutting portion; 24... second top abutting portion; 125... separated opposing portion; 40... electrode body; 500, 600, 700... battery module (power storage device module); 510... module housing; 520, 620, 720... clamping member; 622, 722... clamping main body portion; 623, 723... clamping convex portion; 640... cooling path; Sta... contact area (between the first top abutting portion and the clamping member); Stb... contact area (between the second top abutting portion and the clamping member); Sh... surface area (of the separated opposing portion). Detailed description of the embodiments

[0028] (Embodiment 1)

[0029] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. Figure 1 A perspective view showing a battery 1 (an example of the power storage device of the present invention) constituting the battery module 500 (an example of the power storage device module of the present invention) of the present embodiment, Figure 2 a side view showing the first wide side surface 14 side of the battery 1, Figure 3 a side view showing the second wide side surface 15 side of the battery 1. In addition, Figure 4 a partial cross-sectional view showing the battery module 500, and further showing part A in Figure 5 in Figure 4 In addition, hereinafter, the battery height direction AH, the battery width direction BH, and the battery thickness direction CH of the battery 1 are determined as the directions shown in Figures 1 to 3 shown, and the vertical direction DH and the juxtaposition direction EH of the battery module 500 are determined asFigure 4 and Figure 5 will be described in the directions shown below.

[0030] The battery module 500 is mounted on a vehicle such as a hybrid vehicle, a plug-in hybrid vehicle, or an electric vehicle. The battery module 500 includes a plurality of batteries 1. The battery 1 is a square (rectangular parallelepiped-shaped) and sealed lithium-ion secondary battery, and is composed of a case 10, an electrode body 40 housed in the case 10, an electrolytic solution 5, a positive terminal 50 supported by the case 10, a negative terminal 60, etc. (see Figures 1 to 3 ).

[0031] The case 10 is made of metal (aluminum in the present embodiment) and has a rectangular parallelepiped box shape. It is a bottomed square tube shape with a rectangular opening 31c, and is composed of a case main body member 31 that houses the electrode body 40 inside, and a rectangular plate-shaped case lid member 32 that closes the opening 31c of the case main body member 31. The opening 31c of the case main body member 31 and the peripheral portion 32f of the case lid member 32 are welded in an airtight manner over the entire circumference. An exhaust valve 35 that breaks and opens when the internal pressure of the case 10 exceeds the opening pressure is provided in the case lid member 32. In addition, a liquid injection hole 32k is provided in the case lid member 32, and the liquid injection hole 32k is hermetically sealed by a circular plate-shaped sealing member 36 made of aluminum.

[0032] In addition, rectangular insertion holes (not shown) are respectively provided near the ends of the case lid member 32 on one side BH1 and the other side BH2 in the battery width direction BH. A positive terminal 50 made of aluminum is inserted into the insertion hole on one side BH1. The positive terminal 50 is fixed to the case lid member 32 in a state of being insulated from the case lid member 32 via a resin member 55. The front end portion of the positive terminal 50 on the lower side AH2 in the battery height direction AH is welded to a positive electrode current collector portion 40c (to be described later) of the electrode body 40, so as to be electrically connected to the positive electrode current collector portion 40c. In addition, a negative terminal 60 made of copper is inserted into the insertion hole on the other side BH2. The negative terminal 60 is fixed to the case lid member 32 in a state of being insulated from the case lid member 32 via a resin member 65. The front end portion of the negative terminal 60 on the lower side AH2 is welded to a negative electrode current collector portion 40d (to be described later) of the electrode body 40, so as to be electrically connected to the negative electrode current collector portion 40d.

[0033] The electrode body 40 has a rectangular parallelepiped shape and is of a stacked type, and is formed by alternately stacking a plurality of rectangular positive electrode plates 41 and a plurality of rectangular negative electrode plates 42 via a rectangular separator 43 made of a porous film made of resin in the battery thickness direction CH. On one side BH1 in the battery width direction BH of the electrode body 40, the current collector foils of the respective positive electrode plates 41 overlap in the battery thickness direction CH to form a positive electrode current collector portion 40c. The positive electrode current collector portion 40c is conductively connected to the positive electrode terminal 50. Further, on the other side BH2 in the battery width direction BH of the electrode body 40, the current collector foils of the respective negative electrode plates 42 overlap in the battery thickness direction CH to form a negative electrode current collector portion 40d. The negative electrode current collector portion 40d is conductively connected to the negative electrode terminal 60.

[0034] Next, the outer surface 11 of the housing 10 that is exposed to the outside of the housing 10 will be described in detail (see Figures 1 to 3 ). The housing 10 has a rectangular parallelepiped box shape, and the outer surface 11 of the housing has a rectangular upper surface 12, a lower surface 13, a first wide side surface 14, a second wide side surface 15, a first narrow side surface 16, and a second narrow side surface 17, respectively. The upper surface 12 is located on the upper side AH1 in the battery height direction AH, and the lower surface 13 is located on the lower side AH2. The first wide side surface 14 and the second wide side surface 15 are wider in area than the first narrow side surface 16 and the second narrow side surface 17. The first wide side surface 14 is located on one side CH1 in the battery thickness direction CH, and the second wide side surface 15 is located on the other side CH2 in the battery thickness direction CH. Further, the first narrow side surface 16 is located on one side BH1 in the battery width direction BH, and the second narrow side surface 17 is located on the other side BH2 in the battery width direction BH.

[0035] The outer surface 11 of the housing has one first contact portion (hereinafter also simply referred to as "contact portion") 21 and one second contact portion (hereinafter also simply referred to as "contact portion") 22 that come into contact with a later-described sandwiching member 520 (see Figure 4 and Figure 5 ).

[0036] The first contact portion 21 is a rectangular central portion of the first wide side surface 14 of the outer surface 11 of the housing excluding the peripheral portion (see Figure 2 ). The first contact portion 21 includes one first top contact portion (hereinafter also simply referred to as "top contact portion") 23 formed with a plurality of convex portions 11t (indicated by dots in Figure 2 ). Specifically, in the first embodiment, the entire first contact portion 21 forms the first top contact portion 23. Since only the tops 11tp of the plurality of convex portions 11t of the first top contact portion 23 come into contact with the sandwiching member 520 as described later (see Figure 5 ), the contact area Sta between the first top contact portion 23 and the sandwiching member 520 is reduced compared to the case where the plurality of convex portions 11t are not provided.

[0037] In addition, in the present Embodiment 1, the first top contact portion 23 having a plurality of convex portions 11t and the second top contact portion 24 having a plurality of convex portions 11t, which will be described later, are formed by metal spraying. However, they can also be formed by using other physical or chemical surface roughening treatments, or surface roughening treatments for forming nano-level convex portions by irradiating pulsed lasers.

[0038] In addition, the second contact portion 22 is a rectangular central portion (refer to Figure 3 ) of the second wide side surface 15 of the outer surface 11 of the housing, excluding the peripheral portion. Similar to the first top contact portion 23 of the first contact portion 21, the second contact portion 22 also includes one second top contact portion (hereinafter also simply referred to as the top contact portion) 24 formed with a plurality of convex portions 11t (indicated by dots in Figure 3 ). Since only the tops 11tp of the plurality of convex portions 11t of the second top contact portion 24 come into contact with the sandwiching member 520 as described later (refer to Figure 5 ), the contact area Stb between the second top contact portion 24 and the sandwiching member 520 is reduced compared to the case where no plurality of convex portions 11t are provided.

[0039] In addition, in the present Embodiment 1, the plurality of convex portions 11t are provided only on the first contact portion 21 and the second contact portion 22 of the outer surface 11 of the housing. That is, there are no plurality of convex portions 11t on the upper surface 12, the lower surface 13, the peripheral portions of the first wide side surface 14, the peripheral portions of the second wide side surface 15, the first narrow side surface 16, and the second narrow side surface 17.

[0040] Next, a battery module 500 including a plurality of the above-described batteries 1 will be described (refer to Figure 4 and Figure 5 ). The battery module 500 includes: a plurality of batteries 1 stacked in a single row in the row arrangement direction EH with the battery height direction AH aligned with the vertical direction DH of the battery module 500 and the battery thickness direction CH aligned with the row arrangement direction EH; a plurality of sandwiching members 520 respectively disposed between adjacent batteries 1 in the row arrangement direction EH; and a module housing 510 that houses these batteries 1 and the sandwiching members 520.

[0041] The module housing 510 is made of resin and has a rectangular tubular shape with an opening. The module housing 510 restrains the plurality of batteries 1 and the plurality of sandwiching members 520 arranged in a single row in the row arrangement direction EH. For each battery 1 housed in the module housing 510, one side CH1 in the battery thickness direction CH and one side EH1 in the row arrangement direction EH (in Figure 4 and Figure 5is consistent with the right side (i.e., the first wide side surface 14 is located on one side EH1 of the arrangement direction EH, and the other side CH2 of the battery thickness direction CH is consistent with the other side EH2 of the arrangement direction EH (on the left side in Figure 4 and Figure 5 is consistent with the left side (i.e., the second wide side surface 15 is located on the other side EH2 of the arrangement direction EH). Moreover, are the positive terminal ends 50 of adjacent batteries 1 electrically connected to each other via bus bars (conductive connection components) 530 respectively, and are the negative terminal ends 60 of adjacent batteries 1 electrically connected to each other via bus bars (conductive connection components) 530 respectively, so that the batteries 1 of the battery module 500 are connected in parallel. The bus bar 530 is in the shape of a rectangular plate, and the bus bar 530 and the positive terminal end 50 or the negative terminal end 60 are joined by welding.

[0042] Next, the clamping member 520 will be described. The clamping member 520 is respectively disposed between adjacent batteries 1, and in addition, is also disposed between the module housing 510 and the battery 1. The clamping member 520 is made of an insulating elastomer (ethylene propylene diene rubber (EPDM) in the present Embodiment 1), and is in the shape of a rectangular plate, having a first main surface 520a and a second main surface 520b in an overall planar shape (an overall flat surface) with an area smaller than that of the first wide side surface 14 and the second wide side surface 15 of the battery 1. Each clamping member 520 is disposed with the first main surface 520a located on the other side EH2 of the arrangement direction EH and the second main surface 520b located on one side EH1 of the arrangement direction EH.

[0043] The first main surface 520a of the clamping member 520 contacts the first contact portion 21 (the first top abutting portion 23) of the outer surface 11 of the housing of the battery 1 located on the other side EH2 of the arrangement direction EH of the clamping member 520, that is, the first wide side surface 14. That is, through a plurality of convex portions 11t provided on the first top abutting portion 23 of the battery 1, with their tops 11tp abutting against the first main surface 520a of the clamping member 520, the first contact portion 21 of the battery 1 contacts the first main surface 520a of the clamping member 520. The abutting area Sta between the first top abutting portion 23 of the battery 1 and the first main surface 520a of the clamping member 520 is smaller than the abutting area in the case where no convex portion 11t is provided on the first top abutting portion 23 and it becomes flat, that is, smaller than the flat area Soa of the first top abutting portion 23 (Sta < Soa). Specifically, the abutting area Sta between the first top abutting portion 23 and the first main surface 520a is approximately one-tenth of the flat area Soa of the first top abutting portion 23. Therefore, the heat conduction from the first contact portion 21 of the first wide side surface 14 of the battery 1 to the first main surface 520a of the clamping member 520 is reduced.

[0044] In addition, the second main surface 520b of the sandwiching member 520 contacts the second contact portion 22 (second top abutting portion 24) of the second wide side surface 15 of the outer surface 11 of the housing of the battery 1 on one side EH1 in the column direction EH of the sandwiching member 520. That is, through the plurality of convex portions 11t provided on the second top abutting portion 24 of the battery 1, with their tops 11tp abutting against the second main surface 520b of the sandwiching member 520, the second contact portion 22 of the battery 1 contacts the second main surface 520b of the sandwiching member 520. The abutting area Stb between the second top abutting portion 24 of the battery 1 and the second main surface 520b of the sandwiching member 520 is smaller than the abutting area in the case where the convex portions 11t are not provided on the second top abutting portion 24 and it is flat, that is, smaller than the flat area Sob of the second top abutting portion 24 (Stb < Sob). Specifically, the abutting area Stb between the second top abutting portion 24 and the second main surface 520b is approximately one-tenth of the flat area Sob of the second top abutting portion 24. Therefore, the heat conduction from the second contact portion 22 of the second wide side surface 15 of the battery 1 to the second main surface 520b of the sandwiching member 520 is reduced.

[0045] In the battery module 500 of the first embodiment, the contact portions 21 and 22 of the outer surface 11 of the housing of the battery 1 each include the top abutting portions 23 and 24 with reduced abutting areas Sta and Stb with the sandwiching member 520 through the plurality of convex portions 11t, so that the contact portions 21 and 22 of the battery 1 and the sandwiching member 520 are in contact with each other in a small area. Therefore, compared with the case where the contact portions 21 and 22 of the battery 1 do not have the top abutting portions 23 and 24, the heat conduction from the contact portions 21 and 22 of the battery 1 to the sandwiching member 520 can be reduced. Thus, when a certain battery 1 generates heat, it is possible to suppress the heat from being transferred to the adjacent battery 1 via the sandwiching member 520, thereby suppressing the temperature rise of the adjacent battery 1.

[0046] Moreover, in the first embodiment, the plurality of convex portions 11t are provided only at the contact portions 21 and 22 on the outer surface 11 of the housing of the battery 1. Therefore, since the plurality of convex portions 11t may not be provided at the portions other than the contact portions 21 and 22 on the outer surface 11, it is possible to ensure heat insulation from the sandwiching member 520 while making the battery 1 and the battery module 500 inexpensive.

[0047] (Embodiment 2)

[0048] Next, the second embodiment will be described (refer to Figure 6 and Figure 7)。In addition, the description of parts identical to those in Embodiment 1 is omitted or simplified. In the battery module 500 of Embodiment 1, a rectangular plate-shaped clamping member 520 is used. In contrast, in the battery module 600 of the present Embodiment 2, the difference lies in that a clamping member 620 having a clamping main body portion 622 and a plurality of clamping protrusions 623 is used, and a cooling path 640 for the flow of cooling air is formed between the battery 100 and the clamping member 620. In addition, in the battery 100 of the present Embodiment 2, the range (area) of the outer surface 11 of the housing where a plurality of protrusions 11t are formed is different from that of the battery 1 in Embodiment 1.

[0049] The outer surface 11 of the housing of the battery 100 according to the present Embodiment 2 has a plurality (six) of first contact portions 121 and one second contact portion 22 that come into contact with the clamping member 620.

[0050] Each of the first contact portions 121 is a portion of the first wide side surface 14 of the outer surface 11 of the housing that comes into contact with the plurality (six) of clamping protrusions 623 of the clamping member 620. Each of the first contact portions 121 includes one first top contact portion 123 on which a plurality of protrusions 11t are formed. Specifically, the entirety of the first contact portion 121 forms the first top contact portion 123. The plurality of protrusions 11t themselves are the same as the plurality of protrusions 11t in Embodiment 1. Since only the tops 11tp of the plurality of protrusions 11t of the first top contact portion 123 come into contact with the top surfaces 623m of the clamping protrusions 623 of the clamping member 620, the contact area Sta between the first top contact portion 123 and the clamping member 620 is smaller than the flat area Soa of the first top contact portion 123 (Sta < Soa).

[0051] In addition, the second contact portion 22 is the same as the second contact portion 22 in Embodiment 1 and is formed by a second top contact portion 24 on which a plurality of protrusions 11t are formed. Therefore, the contact area Stb between the second top contact portion 24 and the clamping member 620 is smaller than the flat area Sob of the second top contact portion 24 (Stb < Sob).

[0052] On the other hand, in the second embodiment, a plurality of convex portions 11t are also provided at portions of the outer surface 11 of the housing other than the first contact portion 121 and the second contact portion 22. That is, the first wide side surface 14 of the outer surface 11 of the housing includes a plurality of (five) separated opposing portions 125 that are separated from and opposed to the clamping main body portion 622 of the clamping member 620, thereby forming a plurality of (five) cooling paths 640 between the clamping main body portion 622. Moreover, a plurality of convex portions 11t are also respectively formed at the separated opposing portions 125. The surface area Sh of the separated opposing portion 125 is larger than the flat area Soh in the case where the separated opposing portion 125 is a flat surface without the convex portions 11t provided thereon (Sh > Soh). Therefore, the heat dissipation performance from the separated opposing portion 125 of the first wide side surface 14 of the battery 100 to the cooling path 640 is improved. In addition, the surface area Sh of the separated opposing portion 125 can be obtained by a gas adsorption method using Kr gas.

[0053] In addition, in the second embodiment, a plurality of convex portions 11t are also formed at the peripheral portions (peripheral portions of the first wide side surface 14) of the first wide side surface 14 of the outer surface 11 of the housing, that is, around the first contact portion 121 and the separated opposing portion 125. That is, in the second embodiment, a plurality of convex portions 11t are formed over the entire surface of the first wide side surface 14.

[0054] In addition, a plurality of convex portions 11t are also formed at the peripheral portions (peripheral portions of the second wide side surface 15) of the second wide side surface 15 of the outer surface 11 of the housing, that is, around the second contact portion 22. That is, in the second embodiment, a plurality of convex portions 11t are formed over the entire surface of the second wide side surface 15.

[0055] The clamping member 620 of the second embodiment has: a rectangular plate-shaped clamping main body portion 622 that is disposed between adjacent batteries 100; and a plurality of clamping convex portions 623 that project from the clamping main body portion 622 toward the first contact portion 121 of the battery 100 located on the other side EH2 in the column direction EH of the clamping member 620 and contact the first contact portion 121. The clamping main body portion 622 has a first main surface 622a and a second main surface 622b with areas smaller than the first wide side surface 14 and the second wide side surface 15 of the battery 100. The clamping member 620 is integrally formed of an insulating resin.

[0056] Viewed from the relationship between the clamping member 620 and the battery 100 located on the other side EH2 of the clamping member 620 in the column direction EH, the plurality of clamping protrusions 623 are respectively in contact with a plurality of first contact portions 121 (first top abutting portions 123) in the first wide side surface 14 of the outer surface 11 of the housing. That is, through the plurality of protrusions 11t provided on the first top abutting portion 123, with their tops 11tp abutting against the top surface 623m of the clamping protrusion 623, the first contact portion 121 and the clamping protrusion 623 are in contact with each other with a small area.

[0057] In addition, the first main surface 622a of the clamping main body portion 622 is separated from and opposed to a plurality of separation opposing portions 125 in the first wide side surface 14 of the outer surface 11 of the housing, thereby forming the plurality of cooling paths 640 between the separation opposing portions 125.

[0058] On the other hand, viewed from the relationship between the clamping member 620 and the battery 100 located on one side EH1 of the clamping member 620 in the column direction EH, the second main surface 622b of the clamping main body portion 622 is in contact with the second contact portion 22 (second top abutting portion 24) in the second wide side surface 15 of the outer surface 11 of the housing. That is, through the plurality of protrusions 11 provided on the second top abutting portion 24, with their tops 11tp abutting against the second main surface 622b of the clamping main body portion 622, the second contact portion 22 and the second main surface 622b of the clamping main body portion 622 are in contact with each other with a small area.

[0059] In the battery module 600 of the second embodiment, the contact portions 121 and 22 of the outer surface 11 of the housing of the battery 100 respectively include the top abutting portions 123 and 24 whose contact areas Sta and Stb with the clamping member 620 are reduced by the plurality of protrusions 11t, so that the contact portions 121 and 22 of the battery 100 and the clamping member 620 are in contact with each other with a small area. Therefore, the heat conduction from the contact portions 121 and 22 of the battery 100 to the clamping member 620 can be reduced, and when a certain battery 100 generates heat, the heat can be suppressed from being transferred to the adjacent battery 100 through the clamping member 620.

[0060] In addition, in the second embodiment, a cooling path 640 is formed between the sandwiching main body portion 622 of the sandwiching member 620 and the separated opposing portion 125 of the outer surface 11 of the housing of the battery 100. A plurality of convex portions 11t are also provided on the separated opposing portion 125. Although the plurality of convex portions 11t provided on the separated opposing portion 125 have the same shape as the plurality of convex portions 11t of the contact portions 121 and 22, their functions are different. That is, the plurality of convex portions 11t of the separated opposing portion 125 can increase the surface area Sh facing the cooling path 640, so that the heat of the battery 100 can be efficiently dissipated through the separated opposing portion 125. Therefore, in the battery module 600, on the one hand, in the contact portions 121 and 22 of the outer surface 11 of the housing, the heat transfer of the battery 100 to the adjacent battery 100 can be suppressed (heat insulation of the battery 100), and on the other hand, in the separated opposing portion 125, the heat of the battery 100 can be efficiently dissipated.

[0061] In addition, since the plurality of convex portions 11t of the contact portions 121 and 22 have the same shape as the plurality of convex portions 11t of the separated opposing portion 125, there is also an advantage that they can be formed together by the same method (by metal spraying in the second embodiment) when the plurality of convex portions 11t are formed on the outer surface 11 of the housing.

[0062] In addition, the same parts as those in the first embodiment have the same effects as those in the first embodiment.

[0063] (Third Embodiment)

[0064] Next, the third embodiment will be described (refer to Figure 8 and Figure 7 ). In addition, the description of the same parts as those in the first or second embodiment will be omitted or simplified. The battery module 700 of the third embodiment has a sandwiching member 720 configured in the same manner as the sandwiching member 620 of the second embodiment, which is composed of a sandwiching main body portion 722 and a sandwiching convex portion 723. However, the difference between the sandwiching member 720 of the third embodiment and the sandwiching member 620 of the second embodiment is that it is formed by overlapping two members, namely, a first sandwiching member 725 and a second sandwiching member 726. In addition, in Figure 7 , the boundary between the first sandwiching member 725 and the second sandwiching member 726 is represented by a dotted line.

[0065] The battery 100 according to the third embodiment is the same as the battery 100 according to the second embodiment. That is, the outer surface 11 of the housing of the battery 100 has a plurality of first contact portions 121 and one second contact portion 22. The first contact portion 121 is composed of a first top contact portion 123 having a plurality of convex portions 11t, and contacts the top surface 723m of the clamping convex portion 723 of the clamping member 720 with a small contact area Sta. In addition, the second contact portion 22 is composed of a second top contact portion 24 having a plurality of convex portions 11t, and contacts the second main surface 722b of the clamping main body portion 722 of the clamping member 720 with a small contact area Stb. In addition, the outer surface 11 of the housing includes a plurality of separated and opposed portions 125 that are separated from and opposed to the clamping main body portion 722 of the clamping member 720, thereby forming a plurality of cooling paths 640 between the separated and opposed portions 125, and a plurality of convex portions 11t are also formed on the separated and opposed portions 125 respectively.

[0066] The clamping member 720 according to the third embodiment is composed of a first clamping member 725 and a second clamping member 726 respectively.

[0067] The first clamping member 725 has a first main body portion 725e in the shape of a rectangular plate, and a plurality of first convex portions 725g that protrude from the first main body portion 725e and constitute the plurality of clamping convex portions 723 of the clamping member 720. The first clamping member 725 is the same as the clamping member 620 in the second embodiment and is made of resin.

[0068] The second clamping member 726 is in the shape of a rectangular plate, the same as the clamping member 520 in the first embodiment, and is made of rubber. The second clamping member 726 overlaps with the first main body portion 725e of the first clamping member 725 in the column arrangement direction EH to constitute the clamping main body portion 722 of the clamping member 720. The clamping main body portion 722 is in the shape of a rectangular plate having a first main surface 722a and a second main surface 722b.

[0069] In the battery module 700 according to the third embodiment, the contact portions 121 and 22 of the outer surface 11 of the housing of the battery 100 respectively include the top contact portions 123 and 24 that reduce the contact areas Sta and Stb with the clamping member 720 through a plurality of convex portions 11t, so that the contact portions 121 and 22 of the battery 100 and the clamping member 720 contact each other with a small area. Therefore, the heat conduction from the contact portions 121 and 22 of the battery 100 to the clamping member 720 can be reduced, and when a certain battery 100 generates heat, the heat can be suppressed from being transmitted to the adjacent battery 100 via the clamping member 720. In addition, the same parts as those in the first or second embodiment have the same effects as those in the first or second embodiment.

[0070] As described above, the present invention has been described with reference to Embodiments 1 to 3. However, the present invention is not limited to Embodiments 1 to 3, and can be appropriately modified and applied without departing from the gist thereof.

[0071] For example, in Embodiments 1 to 3, the battery modules 500, 600, and 700 in which a plurality of batteries 1 and 100 are stacked in a single row are illustrated. However, the battery modules may be those in which a plurality of batteries 1 and 100 are stacked in a plurality of rows.

[0072] In addition, in Embodiments 1 to 3, the plurality of batteries 1 and 100 constituting the battery modules 500, 600, and 700 are connected in parallel to each other. However, the electrical connection between the batteries 1 and 100 is not limited thereto, and the batteries 1 and 100 may be connected in series.

Claims

1. An electric storage device module, comprising: A plurality of electric storage devices arranged in series; and an interposing member, the interposing member being interposed between the adjacent electrical storage devices, Each of the electrical storage devices comprises an electrode body and a metal case accommodating the electrode body. The housing has an outer surface exposed to the outside. The outer surface of the housing includes a contact portion that contacts the clamping member. The electric storage device module is characterized in that: The contact portion on the outer surface of the shell includes a top abutting portion, which has a plurality of protrusions, and the tops of these protrusions abut against the clamping part, so that the abutting area between the top abutting portion and the clamping part is reduced compared to a case where the top abutting portion is not provided with the protrusions and becomes flat.

2. The power storage device module according to claim 1, wherein: Only the contact portion in the outer surface of the housing has the plurality of protrusions.

3. The power storage device module according to claim 1, wherein: The clamping member has: an interposing main body, the interposing main body being arranged between the adjacent electrical storage devices; as well as a sandwiching protrusion that protrudes from the sandwiching main body toward the contact portion of at least one of the electrical storage devices and contacts the contact portion, The outer surface of the case of the power storage device includes, in addition to the contact portion, a separated opposing portion which is separated from and opposed to the intervening main body portion and forms a cooling path with the intervening main body portion. The separation facing portion also has the plurality of convex portions, and these convex portions increase the surface area of ​​the separation facing portion facing the cooling path compared to a case where the separation facing portion is not provided with the convex portions and is flat.

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