Battery pack

Abstract

To provide a battery pack capable of suppressing a dew condensation water from accumulating at a heat insulation member.SOLUTION: A battery pack comprises: a battery module in which a plurality of battery cells are arranged and stacked in a first direction; a case that can house the plurality of battery modules arranged in a second direction orthogonal to the first direction; and a plurality of cooling surfaces that are provided at positions opposite to the battery modules corresponding to the maximum number of the battery modules that can be housed in the case respectively, and for cooling the battery cells. In the battery pack in which the number of the battery modules housed in the case is reduced from the maximum number. A heat disconnection member is arranged to between gaps formed by reducing the battery modules to be housed. An upper surface part of the heat disconnection member is an inclination surface which is lower on the battery module side.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a battery pack.

Background Art

[0002] Patent Document 1 discloses a battery pack in which by providing a heat insulating member in at least a part of a second region which is a region where a battery cell group is not arranged, it is possible to suppress the generation of condensed water in the second region where the temperature becomes low.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the battery pack disclosed in Patent Document 1, when condensed water is generated on the heat insulating member, there is a risk that the condensed water cannot evaporate and stays.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a battery pack capable of suppressing the retention of condensed water on a heat insulating member.

Means for Solving the Problems

[0006] In order to solve the above-described problems and achieve the object, a battery pack according to the present invention includes a battery module in which a plurality of battery cells are arranged side by side and stacked in a first direction, a case capable of arranging and accommodating a plurality of the battery modules in a second direction orthogonal to the first direction, and a plurality of cooling surfaces provided at positions facing each battery module corresponding to the maximum number of the battery modules that can be accommodated in the case for cooling each battery module. The battery pack is one in which the number of the battery modules accommodated in the case is reduced from the maximum number, and in the case, a heat insulating member is disposed in a gap formed by reducing the number of the battery modules to be accommodated, and an upper surface portion of the heat insulating member is an inclined surface such that the side of the battery module is lower.

Effects of the Invention

[0007] The battery pack according to the present invention can move the condensed water generated on the inclined surface of the heat insulating member to the side of the battery module that has generated heat, and thus has an effect of suppressing the retention of condensed water on the heat insulating member.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0009] Hereinafter, an embodiment of a battery pack according to the present invention will be described. Note that the present invention is not limited by this embodiment.

[0010] FIG. 1 is a diagram showing a schematic configuration when the inside of a battery pack 1 according to an embodiment is viewed from above. FIG. 2 is a cross-sectional view showing a schematic configuration when the battery pack 1 according to the embodiment is viewed from the side.

[0011] The battery pack 1 according to the embodiment is configured by housing a plurality of battery modules 2, a packing material 3, device components 4, etc. in a case 5. The case 5 is composed of a lower case 51 and an upper case 52 and can accommodate a plurality of battery modules 2. In FIG. 1, the illustration of the upper case 52 is omitted.

[0012] In the battery pack 1 according to the embodiment, up to four battery modules 2 can be accommodated in the case 5, but the number of battery modules 2 to be accommodated is reduced from the maximum number, and three battery modules 2 are accommodated in the case 5. The battery module 2 has a plurality of battery cells arranged and stacked so as to be aligned in the stacking direction Y (first direction) indicated by the arrow Y in FIG. 1. Each battery cell is formed in a rectangular parallelepiped shape, and for example, a lithium ion battery or the like is used. The plurality of battery modules 2 are arranged so as to be aligned in the arrangement direction X (second direction) indicated by the arrow X in FIG. 1, which is a direction orthogonal to the stacking direction Y and the vertical direction Z (third direction) of the battery pack 1 indicated by the arrow Z in FIG. 2, and are accommodated in the case 5. The battery module 2 is constrained by known constraint members such as a pair of end plates, a pair of side plates, and a restraint band so as to integrally hold a plurality of battery cells.

[0013] The packing material 3 is a heat insulating member composed of a foamed resin or the like that is packed and arranged in the gap formed by reducing the number of battery modules 2 in the case 5. Examples of the foamed resin include foamed polypropylene and foamed polystyrene. The size of the packing material 3 is substantially the same as the size of the battery module 2.

[0014] The device component 4 is, for example, a monitoring unit that monitors the voltage, temperature, etc. of each battery module 2.

[0015] The lower case 51 has an upwardly opening shape and has a bottom surface portion 511, side surface portions 512, and a flange portion 513. The lower case 51 is made of a metal material such as iron or aluminum, for example. The bottom surface portion 511 is disposed below the plurality of battery modules 2, the packing material 3, and the equipment parts 4. Below the bottom surface portion 511 of the lower case 51, a plurality of coolers 6 for cooling each battery module 2 are provided at positions facing the battery modules 2 through the bottom surface portion 511, corresponding to the maximum number of battery modules 2 that can be accommodated in the case 5. Therefore, as shown in FIGS. 1 and 2, when the number of battery modules 2 accommodated in the case 5 is reduced and three battery modules 2 and one packing material 3 are accommodated in the case 5, a cooler 6 is also provided below the packing material 3 through the bottom surface portion 511.

[0016] The side surface portions 512 of the lower case 51 stand up from the periphery of the bottom surface portion 511 and surround the plurality of battery modules 2, the packing material 3, and the equipment parts 4. The flange portion 513 of the lower case 51 has a shape that projects outward from the upper end of the side surface portions 512.

[0017] The upper case 52 has a downwardly opening shape and has a top surface portion 521, side surface portions 522, and a flange portion 523. The upper case 52 is made of a metal material such as iron or aluminum, for example. The upper case 52, together with the lower case 51, accommodates the plurality of battery modules 2, the packing material 3, and the equipment parts 4, etc. The top surface portion 521 is formed in a flat plate shape, for example, and is disposed above the plurality of battery modules 2, the packing material 3, and the equipment parts 4. A gap is formed between the top surface portion 521 and the plurality of battery modules 2, the packing material 3, and the equipment parts 4.

[0018] The side surface portion 522 of the upper case 52 extends downward from the periphery of the top surface portion 521 and surrounds the plurality of battery modules 2, the packing material 3, and the device components 4. The flange portion 523 of the upper case 52 has a shape that projects outward from the lower end of the side surface portion 522. The flange portion 523 of the upper case 52 is fixed to the flange portion 513 of the lower case 51 by a fastening member such as a bolt.

[0019] In the battery pack 1 according to the embodiment, the upper surface portion of the packing material 3 is an inclined surface 31 such that the battery module 2 side is lower in the arrangement direction X in FIG. 2. Thereby, since the condensed water 300 generated on the inclined surface 31 of the packing material 3 can be moved to the battery module 2 side that generates heat by its own weight, it becomes possible to promote the evaporation of the condensed water 300 by the heat of the battery module 2, and it is possible to suppress the condensed water 300 from staying in the packing material 3.

Explanation of Reference Numerals

[0020] 1 Battery pack 2 Battery module 3 Packing material 31 Inclined surface 4 Device components 5 Case 6 Cooler 51 Lower case 52 Upper case 300 Condensed water 511 Bottom surface portion 512 Side surface portion 513 Flange portion 521 Top surface portion 522 Side surface portion 523 Flange portion

Claims

【Claim 1】 A battery module in which a plurality of battery cells are arranged side by side in a first direction and stacked, A case capable of arranging and accommodating a plurality of the battery modules in a second direction orthogonal to the first direction, A plurality of cooling surfaces provided at positions facing each battery module corresponding to the maximum number of the battery modules that can be accommodated in the case, for cooling each battery module, Comprising: A battery pack in which the number of the battery modules accommodated in the case is less than the maximum number, In the case, a heat insulating member is disposed in a gap formed by reducing the number of the battery modules to be accommodated, A battery pack, wherein an upper surface portion of the heat insulating member is an inclined surface such that the side of the battery module is lower.

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