Battery pack

Abstract

The utility model provides a battery pack capable of properly fixing a battery module in a shell. The battery pack includes: a case; the plurality of battery modules are stacked and accommodated in the shell; a sealing material which is made of resin and is arranged at a position closer to the outer side than the end part of the battery module; an energizing plate which is laminated between the battery modules such that the end portion thereof is positioned further toward the inside than the end portion of the battery modules, and which electrically connects the battery modules to each other; a cooler which is laminated between the battery modules so that the end portions thereof are positioned further toward the inside than the end portions of the battery modules, and which cools the battery modules; and a filling member which is filled in the housing and which adheres and fixes the battery module, the energizing plate, and the cooler to each other in the housing.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a battery pack. BACKGROUND

[0002] In Patent Literature 1, there is described a battery provided with an anisotropic expansion portion located at the outer periphery of a single cell and serving as a sealing portion that seals the inside of the single cell, and a side restriction portion disposed between the side wall portion of a battery case and the anisotropic expansion portion.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2018-081820 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a case where the anisotropic expansion portion and the side restriction portion are each composed of resin, since the adhesion between the resins is low, there is a case where the battery cell cannot be properly fixed inside the case.

[0008] The present disclosure was made in view of the above-described circumstances, and has an object to provide a battery pack capable of properly fixing a battery module inside a case.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The battery pack of the present disclosure is provided with: a case; a plurality of battery modules stacked and housed inside the case; a sealing member composed of resin and provided at a position outward of the end portions of the battery modules; an electricity passing plate stacked between the battery modules in a manner that the end portions are located at positions inward of the end portions of the battery modules, and electrically connecting the battery modules; a cooler stacked between the battery modules in a manner that the end portions are located at positions inward of the end portions of the battery modules, and cooling the battery modules; and a filler filled inside the case and adhesively fixing the battery modules, the electricity passing plate, and the cooler to each other and to the case.

[0011] EFFECT OF THE INVENTION

[0012] According to the present disclosure, it is possible to achieve a battery pack capable of properly fixing a battery module inside a case. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a cross-sectional view of the battery pack of Embodiment 1.

[0014] Figure 2 is a cross-sectional view of the battery pack of Embodiment 2.

[0015] Figure 3 is a view of the protrusion as viewed from above. Figure 2

[0016] Figure 4 is a cross-sectional view of the battery pack of Embodiment 3.

[0017] Explanation of Reference Numerals

[0018] 1 battery pack

[0019] 2 housing

[0020] 3 battery module

[0021] 4 seal

[0022] 5 power feeding plate

[0023] 5Aa, 6Aa protrusion

[0024] 6 cooler

[0025] 6Ba cooling flow path

[0026] 7 current collecting member

[0027] 8 filler

[0028] 8a filled portion

[0029] 8b adhered portion DETAILED DESCRIPTION

[0030] A battery pack of an embodiment of the present disclosure will be described with reference to the drawings. Furthermore, the constituent elements in the following embodiments contain constituent elements that can be substituted by those skilled in the art and that are easily substituted, or substantially identical constituent elements.

[0031] (Embodiment 1)

[0032] Figure 1 is a cross-sectional view of the battery pack of Embodiment 1. The battery pack 1 is provided with a housing 2, a battery module 3, a seal 4, a power feeding plate 5, a cooler 6, a current collecting member 7, and a filler 8.

[0033] The battery pack 1 is, for example, a battery mounted on a vehicle.

[0034] The housing 2 houses each member that constitutes the battery pack 1.

[0035] The battery module 3 is a plurality of layers stacked along a stacking direction (a vertical direction of the battery module 3). Figure 1 The plurality of battery modules 3 that are stacked are housed in the housing 2.

[0036] The seal 4 is provided at a position further than the end portion of the battery module 3 in the stacking direction (the end portion in the direction orthogonal to the stacking direction, that is, the end portion in the horizontal direction of the battery module 3).​Figure 1 The end portion on the left side of the battery module 3 is positioned outward. The seal 4 is made of a member having insulation such as resin, and protects the battery module 3.

[0037] The power transmission plate 5 is stacked between the battery modules 3 in a manner that the end portion is positioned inward of the end portion of the battery module 3. The power transmission plate 5 electrically connects between the battery modules 3.

[0038] The cooler 6 is stacked between the battery modules 3 in a manner that the end portion is positioned inward of the end portion of the battery module 3. The cooler 6 cools the battery modules 3.

[0039] The power collecting member 7 extracts the electric power of the stacked battery modules 3 as a total positive electrode terminal or a total negative electrode terminal.

[0040] The filler 8 is filled in the case 2, and bonds and fixes the battery modules 3, the power transmission plate 5, and the cooler 6 to each other in the case 2. The filler 8 includes a filling portion 8a that fills gaps between the battery modules 3 and the seal 4 and the case 2, and a bonding portion 8b that bonds the battery modules 3 and the power transmission plate 5 and the battery modules 3 and the cooler 6 by being immersed between the battery modules 3 and the power transmission plate 5 and between the battery modules 3 and the cooler 6, respectively. The filler 8 is made of a material such as resin that changes to a solid state after being filled in the case 2 in a liquid state.

[0041] According to the embodiment 1 described above, by positioning the end portions of the power transmission plate 5 and the cooler 6 inward of the end portions of the battery modules 3, the battery modules 3, the power transmission plate 5, and the cooler 6 that have good adhesion to resin can be bonded to the filler 8, and thus the battery modules 3 can be appropriately fixed in the case 2.

[0042] Further, according to the embodiment 1, the filler 8 is made of a material such as resin that changes to a solid state after being filled in the case 2 in a liquid state, and thus the filler 8 becomes a shape that follows the shape of each component, and the battery modules 3 can be appropriately fixed in the case 2.

[0043] Further, according to the embodiment 1, an adhesive does not need to be additionally applied between the battery modules 3 and the power transmission plate 5 and between the battery modules 3 and the cooler 6, and thus the material of the power transmission plate 5 and the cooler 6 can be selected regardless of adhesion. As a result, a material having higher power transmission performance can be selected as the power transmission plate 5, and a material having higher cooling performance can be selected as the cooler 6.

[0044] (Embodiment 2)

[0045] Figure 2 is a cross-sectional view of a battery pack of the embodiment 2. As Figure 2As shown, in the battery pack 1A, the power feeding plate 5A is provided with a protruding portion 5Aa extending to a position outward of the end portion of the battery module 3. Similarly, the cooler 6A is provided with a protruding portion 6Aa extending to a position outward of the end portion of the battery module 3.

[0046] Figure 3 is a sectional view of the battery pack of Embodiment 1 as viewed from above Figure 2 is a view of the protruding portion. As shown Figure 3 , the protruding portion 6Aa of the cooler 6A is provided with at least one on each side. Similarly, the protruding portion 5Aa of the power feeding plate 5A is also configured to be provided with at least one on each side.

[0047] According to Embodiment 2 described above, by providing the protruding portion 5Aa and the protruding portion 6Aa, the bonding area is increased, and thus the battery module 3 can be more firmly fixed in the housing 2.

[0048] Further, by providing the protruding portion 5Aa and the protruding portion 6Aa with at least one on each side, the power feeding plate 5A and the cooler 6A are more firmly bonded with the filler 8 in each side.

[0049] (Embodiment 3)

[0050] Figure 4 is a sectional view of the battery pack of Embodiment 3. As shown Figure 4 , in the battery pack 1B, the protruding portion 6Ba extending from the cooler 6B is internally formed with a cooling flow path 6Bb.

[0051] According to Embodiment 3 described above, by internally forming the cooling flow path 6Bb in the protruding portion 6Ba, the cooling performance can be improved.

[0052] Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader scope of the present application is not limited to the specific details, representative embodiments, and examples shown above. Therefore, various modifications can be made without departing from the spirit or scope of the application defined by the appended claims and their equivalents.

Claims

1. A battery pack, comprising: case; Multiple battery modules are stacked and housed within the housing; A seal, made of resin, is located on the outer side of the end of the battery module; A power board is stacked between the battery modules with its end located inside the end of the battery module, thereby electrically connecting the battery modules. A cooler, stacked between the battery modules with its ends positioned inwards from the ends of the battery modules, cools the battery modules; and A filler is placed inside the housing to bond and fix the battery module, the power board, and the cooler to each other inside the housing.

2. The battery pack according to claim 1, The power board or the cooler has an extension that extends to the outside of the end of the battery module.

3. The battery pack according to claim 2, The protrusion extending from the cooler has a cooling flow path formed inside.

4. The battery pack according to claim 1, The filler is made of a material that changes to a solid state after being filled into the shell in a liquid state.

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