Battery

Abstract

A battery includes a cell stack (CS) having a rectangular parallelepiped shape in which a plurality of rectangular cells (C1 to C6) with terminals arranged on both end surfaces in a longitudinal direction thereof are stacked one on top of the other, and a case (LC, UC) configured to accommodate the cell stack (CS) therein. The cell stack (CS) includes a metallic connecting member (MB1, MB2) configured to connect each of the lower ends in the longitudinal direction of the plurality of rectangular cells (C1 to C6), and the connecting member (MB1, MB2) is fixed to the case (LC, UC) by a thermally conductive adhesive (AL1, AL2).

Description

BACKGROUND

[0001] The present invention relates to a battery.

[0002] In a prior art battery, a terminal is provided on the top surface of each stacked rectangular cell. Recently, as disclosed in US 2022 / 0 302 533 A1, a battery has been developed in which a terminal is provided on the end face in the longitudinal direction of each stacked rectangular cell. SUMMARY

[0003] When such a battery is charged, the temperature rises near the terminal in each rectangular cell. This means that there was a problem of the temperature rising locally within the rectangular cells. This problem becomes particularly significant when the battery is charged quickly.

[0004] The present invention has been made in view of the above-described circumstances and provides a battery capable of suppressing a local temperature rise within rectangular cells during charging of the battery.

[0005] A battery according to one aspect of the present invention comprises: a cell stack having a rectangular parallelepiped shape in which a plurality of rectangular cells having terminals arranged on both end surfaces in a longitudinal direction thereof are stacked on top of each other; and a housing configured to receive the cell stack therein, wherein the cell stack comprises a metallic connecting element configured to connect each of the lower ends in the longitudinal direction of the plurality of rectangular cells, and the connecting element is attached to the housing using a thermally conductive adhesive.

[0006] In the battery according to one aspect of the present invention, each of the two lower ends in the longitudinal direction of the cell stack is connected by a metal connector, and the metal connector is fixed to the case by a thermally conductive adhesive. Therefore, it is possible to dissipate heat generated near the terminal during battery charging to the case via the connector and the thermally conductive adhesive. This makes it possible to suppress the local temperature rise within the rectangular cells during battery charging.

[0007] An insulating plate may be disposed between the plurality of rectangular cells and the connecting member, and a plurality of through-holes formed in the insulating plate to correspond to the plurality of rectangular cells may be filled with a thermally conductive material having an insulating property. With the above-described configuration, it is possible to increase the thermal conduction between the rectangular cells and the connecting member while ensuring electrical insulation between the rectangular cells and the connecting member.

[0008] The thermally conductive material can be the same as the thermally conductive adhesive. The configuration described above allows the battery to be easily manufactured.

[0009] The battery may further include a cooler under a bottom plate of the housing. The above-described configuration allows the heat generated in the cell stack during battery charging to be more effectively dissipated from the bottom plate of the housing through the connecting element and the thermally conductive adhesive.

[0010] The connecting element can be a metal strip with an L-shaped cross-section.

[0011] According to the present invention, it is possible to provide a battery capable of suppressing a local temperature rise within rectangular cells during charging of the battery.

[0012] The above and other objects, features and advantages of the present invention will become more apparent from the detailed description given below and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a cell stack in a battery according to a first embodiment; Fig. 2 is a perspective view showing the cell stack in the battery according to the first embodiment; Fig. 3 is a cross-sectional view showing the battery according to the first embodiment; Fig. Fig. 4 is a perspective view showing the position of an insulating plate IP1 relative to the rectangular cells C1 to C6; and Fig. 5 is a perspective view showing the position of an insulating plate IP2 relative to the rectangular cells C1 to C6. DESCRIPTION OF EMBODIMENTS

[0013] Specific embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. For clarity of description, the following descriptions and drawings are simplified where appropriate. (First embodiment)

[0014] First, a configuration of a battery according to a first embodiment will be described with reference to FIG. Fig. 1 to 3. The Fig. 1 and Fig. 2 are both perspective views showing a cell stack in the battery according to the first embodiment. Fig. 3 is a cross-sectional view showing the battery according to the first embodiment.

[0015] The battery according to this embodiment is used, for example, for a battery mounted in a vehicle. The vehicle in which the battery according to this embodiment is mounted is not limited to a specific vehicle. For example, the vehicle may be an electric vehicle, a hybrid vehicle, a fuel cell vehicle, or the like, which can be powered by electric power supplied from the battery.

[0016] It goes without saying that in each of the Fig. 1 to 3 and other drawings is shown for the sake of simplicity to explain the positional relationship between the components. In all drawings, such as Fig. 1, the positive direction on the Z axis is generally the vertically upward direction, and the XY plane is parallel to the horizontal plane.

[0017] As in Fig. 3, the battery of the first embodiment includes a cell stack CS, an upper case UC, a lower case LC and a cooler CO. It should be noted that, as shown in the Fig. 1 and Fig. 2, the cell stack CS comprises rectangular cells C1 to C6, busbars B1 to B5 and metal strips MB1 and MB2 and, as shown in Fig. 3, also includes adhesive layers AL1 and AL2, insulating plates IP1 and IP2 and thermally conductive layers TL1 and TL2.

[0018] It should be noted that in Fig. 3 Instead of cross-sectional views, side views of the rectangular cell C1 and the cooler CO are shown.

[0019] First, the configuration of the cell stack CS is described with reference to the Fig. 1 to 3.

[0020] As in the Fig. 1 and Fig. As shown in Figure 2, the rectangular cells C1 to C6 are rectangular cells, each having a rectangular parallelepiped shape extending in the Y-axis direction. The rectangular cells C1 to C6 are stacked on top of each other in the thickness direction (X-axis direction), thus forming the cell stack CS. Each of the rectangular cells C1 to C6 is, for example, a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery.

[0021] It should be noted that in the Fig. 1 and Fig. 2 the cell stack CS is shown in a simplified manner. Although the Fig. 1 and Fig. While the cell stack CS shown in Figure 2 is formed from six of the rectangular cells C1 to C6, it is usually formed from more rectangular cells. In fact, the number of rectangular cells constituting the cell stack CS is not limited to a specific number and can be any number of two or more.

[0022] Furthermore, a heat-insulating plate, a spacer for adjusting a distance between adjacent rectangular cells, and / or the like (not shown) may be inserted between adjacent rectangular cells. Furthermore, end plates (not shown) may be provided at both ends in the stacking direction (X-axis direction) of the cell stack CS.

[0023] As in Fig. 1, a positive electrode terminal PT1 is provided on one end face (an end face on the negative side of the Y-axis) of the rectangular cell C1 in its longitudinal direction. Fig. The positive electrode terminal PT1 shown in Figure 1 has a rectangular shape in the XZ plan view and is provided so as to protrude outward from the end face of the rectangular cell C1. However, the present invention is not particularly limited thereto. Furthermore, the positive electrode terminal PT1 shown in Figure 1 Fig. The positive electrode terminal PT1 shown in Figure 1 is provided on the top side (the positive side of the Z axis) of the end face of the rectangular cell C1. The positive electrode terminal PT1 is made of a metal material such as copper with excellent electrical conductivity.

[0024] Similar to Fig. 1, a negative electrode terminal NT2 is provided on an end face (an end face on the negative side of the Y-axis) of the rectangular cell C2 adjacent to the rectangular cell C1 in the longitudinal direction thereof. A positive electrode terminal PT3 is provided on an end face (an end face on the negative side of the Y-axis) of the rectangular cell C3 adjacent to the rectangular cell C2 in the longitudinal direction thereof. A negative electrode terminal NT4 is provided on an end face (an end face on the negative side of the Y-axis) of the rectangular cell C4 adjacent to the rectangular cell C3 in the longitudinal direction thereof. A positive electrode terminal PT5 is provided on an end face (an end face on the negative side of the Y-axis) of the rectangular cell C5 adjacent to the rectangular cell C4 in the longitudinal direction thereof.A negative electrode terminal NT6 is provided on one end face (an end face on the negative side of the Y-axis) of the rectangular cell C6 adjacent to the rectangular cell C5 in its longitudinal direction.

[0025] As in Fig. 1, the negative electrode terminal NT2 of the rectangular cell C2, the positive electrode terminal PT3 of the rectangular cell C3, the negative electrode terminal NT4 of the rectangular cell C4, the positive electrode terminal PT5 of the rectangular cell C5, and the negative electrode terminal NT6 of the rectangular cell C6 each have a shape similar to that of the positive electrode terminal PT1 of the rectangular cell C1, and they are arranged in a similar manner to the arrangement of the positive electrode terminal PT1 of the rectangular cell C1.

[0026] Furthermore, as in Fig. 1, the positive electrode terminal PT1 of the rectangular cell C1 and the negative electrode terminal NT2 of the rectangular cell C2, which are arranged to be adjacent to each other, are electrically connected to each other by the plate-like bus bar B1. Similarly, the positive electrode terminal PT3 of the rectangular cell C3 and the negative electrode terminal NT4 of the rectangular cell C4, which are arranged to be adjacent to each other, are electrically connected to each other by the plate-like bus bar B3. Similarly, the positive electrode terminal PT5 of the rectangular cell C5 and the negative electrode terminal NT6 of the rectangular cell C6, which are arranged to be adjacent to each other, are electrically connected to each other by the plate-like bus bar B5.

[0027] In addition, as in Fig. 2, a negative electrode terminal NT1 is provided on the other end face (an end face on the positive side of the Y-axis) of the rectangular cell C1 in its longitudinal direction. Fig. The positive electrode terminal PT1 shown in Figure 1 has the Fig. 2 has a rectangular shape in the XZ plan view and is provided so as to protrude outward from the end face of the rectangular cell C1. However, the present invention is not particularly limited thereto. As shown in Fig. 1 shown positive electrode terminal PT1 is also the one in Fig. The negative electrode terminal NT1 shown in Figure 2 is provided on the top side (the positive side of the Z axis) of the end face of the rectangular cell C1. Like the positive electrode terminal PT1, the negative electrode terminal NT1 is made of a metal material such as copper with excellent electrical conductivity.

[0028] Similar to Fig. 2, a positive electrode terminal PT2 is provided on the other end face (an end face on the positive side of the Y-axis) of the rectangular cell C2 adjacent to the rectangular cell C1 in the longitudinal direction thereof. A negative electrode terminal NT3 is provided on the other end face (an end face on the positive side of the Y-axis) of the rectangular cell C3 adjacent to the rectangular cell C2 in the longitudinal direction thereof. A positive electrode terminal PT4 is provided on the other end face (an end face on the positive side of the Y-axis) of the rectangular cell C4 adjacent to the rectangular cell C3 in the longitudinal direction thereof. A negative electrode terminal NT5 is provided on the other end face (an end face on the positive side of the Y-axis) of the rectangular cell C5 adjacent to the rectangular cell C4 in the longitudinal direction thereof.A positive electrode terminal PT6 is provided on the other end face (an end face on the positive side of the Y-axis) of the rectangular cell C6 adjacent to the rectangular cell C5 in its longitudinal direction.

[0029] As in Fig. 2, the positive electrode terminal PT2 of the rectangular cell C2, the negative electrode terminal NT3 of the rectangular cell C3, the positive electrode terminal PT4 of the rectangular cell C4, the negative electrode terminal NT5 of the rectangular cell C5, and the positive electrode terminal PT6 of the rectangular cell C6 each have a shape similar to that of the negative electrode terminal NT1 of the rectangular cell C1, and they are arranged in a similar manner to the arrangement of the negative electrode terminal NT1 of the rectangular cell C1.

[0030] Furthermore, as in Fig. 2, the positive electrode terminal PT2 of the rectangular cell C2 and the negative electrode terminal NT3 of the rectangular cell C3, which are arranged to be adjacent to each other, are electrically connected to each other by the plate-like bus bar B2. Similarly, the positive electrode terminal PT4 of the rectangular cell C4 and the negative electrode terminal NT5 of the rectangular cell C5, which are arranged to be adjacent to each other, are electrically connected to each other by the plate-like bus bar B4. As described above, in the Fig. 1 and Fig. In the cell stack CS shown in Figure 2, the rectangular cells C1 to C6 are connected in series by the busbars B1 to B5.

[0031] It should be noted that the negative electrode terminal NT1 of the Fig. 2 is connected to the positive electrode terminal of another cell stack, for example, via a bus bar (not shown). However, the present invention is not particularly limited thereto. Furthermore, the positive electrode terminal PT6 of the Fig. 2 is connected to the negative electrode terminal of another cell stack, for example, via a busbar (not shown). However, the present invention is not particularly limited thereto. For example, the above structure allows multiple cell stacks to be connected in series.

[0032] Since the Fig. 1 and Fig. Since the busbars B1 to B5 shown in Figure 2 have similar structures, busbar B1 will be described. As shown in Fig. As shown in Figure 1, the busbar B1 is a plate-like member that connects the positive electrode terminal PT1 of the rectangular cell C1 to the negative electrode terminal NT2 of the rectangular cell C2, which are arranged adjacent to each other. The busbar B1 is made of a metal material such as copper with excellent electrical conductivity.

[0033] As in Fig. For example, as shown in Figure 1, the busbar B1 is a plate-like member with a rectangular shape in the XZ plan view. The busbar B1 is provided to approximately cover the entire positive electrode terminal PT1 of the rectangular cell C1 and the entire negative electrode terminal NT2 of the rectangular cell C2. The busbar B1 includes a pair of weldments WP1 and WP2 welded to the positive electrode terminal PT1 of the rectangular cell C1 and the negative electrode terminal NT2 of the rectangular cell C2, respectively, which are arranged adjacent to each other.

[0034] The Fig. The welded parts WP1 and WP2 shown in Figure 1 are provided near both ends in the X-axis direction of the busbar B1 at its lower part (i.e., the part on the negative side of the Z-axis). However, the positions of the welded parts WP1 and WP2 are not limited to a specific location. It should be noted that Fig. 1 shows the welded parts WP1 and WP2 before welding. Fig. The weldments WP1 and WP2 shown in Figure 1 are provided with a counterbore so that the areas of the busbar in which they are provided are thinner than the rest of the area, ie the area around the busbar. In addition, each of the weldments shown in Figure 1 has a Fig. 1, the welded parts WP1 and WP2 have a round shape in the XZ plan view and a through hole is formed in its center.

[0035] The welding process is not limited to a specific method. For example, the busbar B1 on the welding part WP1 is welded to the positive electrode terminal PT1 of the rectangular cell C1 by directing a laser beam from the negative side of the Y-axis onto the welding part WP1. Similarly, the busbar B1 on the welding part WP2 is welded to the negative electrode terminal NT2 of the rectangular cell C2 by directing a laser beam from the negative side of the Y-axis onto the welding part WP2.

[0036] As in the Fig. 1 and Fig. As shown in Figure 2, the metal bands (connecting elements) MB1 and MB2 are metal elements, each of which has an L-shape in the YZ cross-section and extends the entire length of the cell stack CS in the stacking direction. The metal bands MB1 and MB2 connect, i.e., hold, both lower ends in the longitudinal direction of the rectangular cells C1 to C6 (i.e., the cell stack CS).

[0037] It should be noted that the metal strips MB1 and MB2 may be divided into several sections and the several sections are arranged over the entire length of the cell stack CS.

[0038] More precisely, as in Fig. 3, the metal belt MB1 is provided in an L-shape in the YZ cross-section along the lower corners on the negative side of the Y-axis of the rectangular cells C1 to C6, and includes a bottom plate supporting the bottom surfaces of the rectangular cells C1 to C6 and a side plate supporting the end surfaces of the rectangular cells C1 to C6. Similarly, the metal belt MB2 is provided in an L-shape in the YZ cross-section along the lower corners on the positive side of the Y-axis of the rectangular cells C1 to C6, and includes a bottom plate supporting the bottom surfaces of the rectangular cells C1 to C6 and a side plate supporting the end surfaces of the rectangular cells C1 to C6.

[0039] Each of the metal strips MB1 and MB2 can have an L-shape in the YZ cross-section, but also, for example, a flat, plate-like shape.

[0040] As in Fig. As shown in Figure 3, the adhesive layer AL1 consists of a thermally conductive adhesive and fixes the metal strip MB1 to the bottom plate of the lower housing LC. Similarly, the adhesive layer AL2 consists of a thermally conductive adhesive and fixes the metal strip MB2 to the bottom plate of the lower housing LC.

[0041] The thermally conductive adhesive used to make up the adhesive layers AL1 and AL2, for example, is an adhesive with a thermal conductivity of 1 W / (m K) or higher. The thermally conductive adhesive may exhibit insulating properties.

[0042] It should be noted that the metal strips MB1 and MB2 can be attached, for example, to a side plate of the housing or a bracket forming part of the housing, with the adhesive layers AL1 and AL2 arranged therebetween.

[0043] At the Fig. In the battery shown in Figure 3, the heat generated during battery charging near the positive electrode terminal PT1 of the rectangular cell C1 can be dissipated to the bottom plate of the lower case LC via the metal strip MB1 and the adhesive layer AL1. Similarly, the heat generated during battery charging near the negative electrode terminal NT1 of the rectangular cell C1 can be dissipated to the bottom plate of the lower case LC via the metal strip MB2 and the adhesive layer AL2. That is, by bonding the metal strips MB1 and MB2 to the lower case LC via the adhesive layers AL1 and AL2, the local temperature rise in the rectangular cell C1 during battery charging can be suppressed.

[0044] The insulation panels IP1 and IP2 are described below with reference to the Fig. 4 and Fig. 5 and on Fig. 3 described. Fig. Figure 4 is a perspective view showing the position of the insulating plate IP1 with respect to the rectangular cells C1 to C6. Fig. Figure 5 is a perspective view showing the position of the insulating plate IP2 with respect to the rectangular cells C1 to C6.

[0045] As in the Fig. 4 and Fig. As shown in Figure 5, each of the insulating plates IP1 and IP2 is an insulating element with an L-shape in the YZ cross-section, extending the entire length of the cell stack CS in the stacking direction. The insulating plates IP1 and IP2 are made of, for example, a resin.

[0046] It should be noted that, as in Fig. 4, six through holes TH1 are provided in the insulating plate IP1, each corresponding to the rectangular cells C1 to C6. Likewise, as shown in Fig. 5, six through holes TH2 are provided in the insulating plate IP2, each corresponding to the rectangular cells C1 to C6.

[0047] Although the Fig. 4 and Fig. While the through holes TH1 and TH2 shown in Figure 5 are rectangular in the XZ plan view, they can also be circular or elliptical, for example. This means that their shapes are not limited to a specific shape.

[0048] As in Fig. As shown in Figure 3, the insulating plate IP1 is provided between the rectangular cells C1 to C6 and the metal strip MB1 at the lower corners on the negative side of the Y-axis of the rectangular cells C1 to C6, and electrically isolates the rectangular cells C1 to C6 from the metal strip MB1. Similarly, the insulating plate IP2 is provided between the rectangular cells C1 to C6 and the metal strip MB2 at the lower corners on the positive side of the Y-axis of the rectangular cells C1 to C6, and electrically isolates the rectangular cells C1 to C6 from the metal strip MB2.

[0049] Furthermore, the Fig. The insulating plates IP1 and IP2 shown in Figure 3 are L-shaped in YZ cross-section, corresponding to the shapes of the metal strips MB1 and MB2, respectively. They are slightly larger than the metal strips MB1 and MB2, respectively, and are arranged to protrude from the metal strips MB1 and MB2, respectively. However, the shapes and sizes of the insulating plates IP1 and IP2 are not limited to any specific shapes and sizes.

[0050] The thermally conductive layer TL1 consists of a thermally conductive material with insulating properties, and as in Fig. As shown in Figure 3, each of the through holes TH1 provided in the insulating plate IP1 is filled with the same thermally conductive material. That is, the thermally conductive layer TL1 thermally connects the metal strip MB1 and the rectangular cells C1 to C6 while electrically insulating them from each other.

[0051] Similarly, the thermally conductive layer TL2 is made of a thermally conductive material with insulating properties, and each of the through-holes TH2 in the insulating plate IP2 is filled with the same thermally conductive material. This means that the thermally conductive layer TL2 thermally connects the metal strip MB2 and the rectangular cells C1 to C6 while electrically insulating them from each other.

[0052] The configuration described above can be used in Fig. In the battery shown in Figure 3, the heat generated during battery charging near the positive electrode terminal PT1 of the rectangular cell C1 can be dissipated to the bottom plate of the lower casing LC via the heat-conducting layer TL1, the metal strip MB1, and the adhesive layer AL1. Similarly, the heat generated during battery charging near the negative electrode terminal NT1 of the rectangular cell C1 can be dissipated to the bottom plate of the lower casing LC via the heat-conducting layer TL2, the metal strip MB2, and the adhesive layer AL2.

[0053] That is, by connecting the metal strips MB1 and MB2, which are bonded to the lower case LC through the adhesive layers AL1 and AL2, to the rectangular cells C1 to C6 through the thermally conductive layers TL1 and TL2, the local temperature rise inside the rectangular cell C1 during battery charging can be further suppressed.

[0054] It should be noted that the thermally conductive material of the thermally conductive layers TL1 and TL2 can be the same material as the thermally conductive adhesive of the adhesive layers AL1 and AL2. The configuration described above allows for easy manufacturing of the battery.

[0055] It should be noted that the insulating plates IP1 and IP2 are not absolutely necessary as long as the rectangular cells C1 to C6 and the metal strips MB1 and MB2 can be electrically insulated from each other. Therefore, the thermally conductive layers TL1 and TL2 are also not absolutely necessary.

[0056] As in Fig. As shown in Figure 3, the upper casing UC and the lower casing LC form a housing in which the cell stack CS is housed. The upper casing UC is a metal plate covering the upper surface of the cell stack CS, and the lower casing LC is a metal plate supporting the lower surface of the cell stack CS. The lower surface of the cell stack CS (i.e., the rectangular cells C1 to C6) and the upper surface of the lower casing LC are electrically insulated, for example, by a thermally conductive layer with insulating properties (not shown).

[0057] It should be noted that a plurality of cell stacks CS can be arranged side by side in the Y-axis direction within the case (ie, between the upper case UC and the lower case LC).

[0058] The cooler CO cools the cell stack CS, ie the rectangular cells C1 to C6. As in Fig.As shown in Figure 3, the cooler CO extends the entire length of the cell stack CS in the stacking direction (X-axis direction) while contacting the bottom surface of the lower case LC. For example, multiple refrigerant tubes extending in the X-axis direction are arranged side by side in the Y-axis direction within the cooler CO. However, the configuration of the cooler is not limited to such a configuration. The refrigerant flowing in the refrigerant tubes is, for example, water.

[0059] The central parts in the longitudinal direction (Y-axis direction) of the rectangular cells C1 to C6 are cooled by the cooler CO through the lower casing LC. The end parts in the longitudinal direction of the rectangular cells C1 to C6 are cooled by the cooler CO through the thermally conductive layer TL1, the metal tape MB1, the adhesive layer AL1, and the lower casing LC.

[0060] As described above, in the battery according to this embodiment, both lower ends in the longitudinal direction of the cell stack CS are respectively connected, that is, held, by the metal bands MB1 and MB2 each having an L-shape in cross section, and the metal bands MB1 and MB2 are fixed to the bottom plate of the lower case LC by the adhesive layers AL1 and AL2 made of a thermally conductive adhesive.

[0061] Therefore, the heat generated near the positive electrode terminals PT1 to PT6 and the negative electrode terminals NT1 to NT6 of the rectangular cells C1 to C6 during battery charging can be dissipated to the bottom plate of the lower case LC via the metal strips MB1 and MB2 and the adhesive layers AL1 and AL2. This can suppress the local temperature rise in the rectangular cells C1 to C6 during battery charging.

[0062] From the invention thus described, it will be apparent that the embodiments of the invention may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications that would be obvious to one skilled in the art are intended to be included within the scope of the following claims. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 2022 / 0 302 533 A1

[0002]

Claims

[1] Battery, comprising: a cell stack (CS) having a rectangular parallelepiped shape in which a plurality of rectangular cells (C1 to C6) having terminals arranged on both end surfaces in a longitudinal direction thereof are stacked on top of each other; and a housing (LC, UC) configured to receive the cell stack (CS) therein, wherein the cell stack (CS) comprises a metallic connecting element (MB1, MB2) configured to connect each of the lower ends in the longitudinal direction of the plurality of rectangular cells (C1 to C6), and the connecting element (MB1, MB2) is attached to the housing (LC, UC) by a thermally conductive adhesive (AL1, AL2). [2] Battery according to claim 1, wherein an insulating plate (IP1, IP2) is arranged between the plurality of rectangular cells (C1 to C6) and the connecting element (MB1, MB2), and a plurality of through holes (TH1, TH2) formed in the insulating plate (IP1, IP2) so as to correspond respectively to the plurality of rectangular cells (C1 to C6) are filled with a heat-conducting material (TL1, TL2) having an insulating property. [3] The battery according to claim 2, wherein the thermally conductive material (TL1, TL2) is the same material as that of the thermally conductive adhesive (AL1, AL2). [4] Battery according to one of claims 1 to 3, further comprising a cooler (CO) under a bottom plate of the housing (LC, UC). [5] Battery according to one of claims 1 to 3, wherein the connecting element (MB1, MB2) is a metal strip with an L-shaped cross section.

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