Battery pack

Abstract

To provide a battery pack which enables battery modules to be properly fixed to the inside of a case.SOLUTION: A battery pack comprises: a case; battery modules stacked and housed in the case; seal materials each of which is made of a resin and provided at the outer side relative to an end of the battery module; electrification plates each of which is disposed between the battery modules in a manner that its end is located at the inner side relative to the end of the battery module and electrically connects the battery modules; coolers each of which is disposed between the battery modules in a manner that its end is located at the inner side relative to the end of the battery module and cools the battery modules; and a filler which fills the case, bonds the battery modules, the electrification plates, and the coolers to each other and fixes these components to the inside of the case.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent document 1 describes a battery that includes an anisotropic stretching portion that is located on the outer periphery of a single cell and also serves as a sealing portion that seals the inside of the single cell, and a lateral regulating portion that is positioned between the side wall portion of the cell case and the anisotropic stretching portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-081820 Summary of the Invention [Problem to be solved by the invention]

[0004] If the anisotropic extensible portion and the lateral restriction portion are both made of resin, the resins have low adhesiveness, and it may not be possible to properly secure the battery cell within the case.

[0005] The present disclosure has been made in view of the above, and has an object to provide a battery pack that can properly fix a battery module within a case. [Means for solving the problem]

[0006] The battery pack according to the present disclosure comprises a case, a plurality of battery modules stacked and housed within the case, a sealing material made of resin and provided outside the ends of the battery modules, a conductive plate that is stacked between the battery modules so that its end is located inside the ends of the battery modules and electrically connects the battery modules, a cooler that is stacked between the battery modules so that its end is located inside the ends of the battery modules and cools the battery modules, and a filler that is filled within the case and that bonds the battery modules, the conductive plate, and the cooler to each other and secures them within the case. [Effects of the Invention]

[0007] According to the present disclosure, a battery pack can be realized in which a battery module can be appropriately fixed inside a case. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a battery pack according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a battery pack according to the second embodiment. [Figure 3] FIG. 3 is a top view of the protruding portion shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view of a battery pack according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A battery pack according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially the same.

[0010] (Embodiment 1) 1 is a cross-sectional view of a battery pack according to embodiment 1. The battery pack 1 includes a case 2, a battery module 3, a sealing material 4, a current-carrying plate 5, a cooler 6, a current-collecting member 7, and a filler 8.

[0011] The battery pack 1 is, for example, a battery mounted on a vehicle.

[0012] The case 2 accommodates the components that make up the battery pack 1.

[0013] The battery module 3 has a plurality of layers stacked in a stacking direction (the vertical direction in FIG. 1). The stacked battery modules 3 are housed in a case 2.

[0014] The sealing material 4 is provided outside the end (the end in the direction perpendicular to the stacking direction, i.e., the left end in FIG. 1) of the battery module 3. The sealing material 4 is made of an insulating material such as resin, and protects the battery module 3.

[0015] The current-carrying plates 5 are stacked between the battery modules 3 so that their ends are positioned more inward than the ends of the battery modules 3. The current-carrying plates 5 electrically connect the battery modules 3 together.

[0016] The cooler 6 is stacked between the battery modules 3 so that its end is located inside the end of the battery module 3. The cooler 6 cools the battery module 3.

[0017] The current collecting member 7 extracts the electric power of the stacked battery modules 3 as a total positive terminal or a total negative terminal.

[0018] The filler 8 is filled into the case 2, and bonds the battery modules 3, the current-carrying plates 5, and the cooler 6 together and secures them within the case 2. The filler 8 includes a filling portion 8a that fills the gaps between the battery modules 3 and the sealing material 4 and the case 2, and an adhesive portion 8b that penetrates between the battery modules 3 and the current-carrying plates 5 and between the battery modules 3 and the cooler 6 to bond the battery modules 3 and the current-carrying plates 5 and the battery modules 3 and the cooler 6, respectively. The filler 8 is made of a material such as resin that changes from a liquid state when filled into the case 2 and then solidifies.

[0019] According to the above-described embodiment 1, by positioning the ends of the conductive plate 5 and the cooler 6 inside the ends of the battery module 3, the battery module 3, the conductive plate 5, and the cooler 6, which have good adhesion to resin, can be bonded to the filler 8, and the battery module 3 can be properly fixed within the case 2.

[0020] Furthermore, according to 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, so that the filler 8 takes a shape that follows the shape of each component, and the battery module 3 can be properly fixed in the case 2.

[0021] Furthermore, according to the first embodiment, there is no need to apply a separate adhesive between the battery module 3 and the current-carrying plate 5, and between the battery module 3 and the cooler 6, so that materials for the current-carrying plate 5 and the cooler 6 can be selected without considering adhesiveness. As a result, a material with higher current-carrying performance can be selected for the current-carrying plate 5, and a material with higher cooling performance can be selected for the cooler 6.

[0022] (Embodiment 2) Fig. 2 is a cross-sectional view of a battery pack according to embodiment 2. As shown in Fig. 2, in the battery pack 1A, the current-carrying plate 5A has a protruding portion 5Aa that extends beyond the end of the battery module 3. Similarly, the cooler 6A has a protruding portion 6Aa that extends beyond the end of the battery module 3.

[0023] Fig. 3 is a top view of the protruding portion shown in Fig. 2. As shown in Fig. 3, the cooler 6A has at least one protruding portion 6Aa on each side. Similarly, the current-carrying plate 5A may have at least one protruding portion 5Aa on each side.

[0024] According to the second embodiment described above, the battery module 3 can be fixed more firmly inside the case 2 because the adhesion area is increased by providing the protruding portions 5Aa and 6Aa.

[0025] In addition, by providing the protruding portion 5Aa and the protruding portion 6Aa at at least one location on each side, the current-carrying plate 5A and the cooler 6A are more firmly bonded to the filler 8 on each side.

[0026] (Embodiment 3) Fig. 4 is a cross-sectional view of a battery pack according to embodiment 3. As shown in Fig. 4, in a battery pack 1B, a cooling flow path 6Bb is formed inside a protruding portion 6Ba extending from a cooler 6B.

[0027] According to the third embodiment described above, the cooling flow path 6Bb is formed inside the protruding portion 6Ba, thereby improving the cooling performance.

[0028] Further advantages and modifications will readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0029] 1 battery pack 2 cases 3 Battery Module 4. Sealing material 5 Current-carrying board 5Aa, 6Aa protruding part 6 Cooler 6Ba cooling channel 7 Current collecting member 8 Filler 8a Filling section 8b Adhesive part

Claims

1. Case and a plurality of battery modules stacked and housed in the case; a sealing material made of resin and provided outside the end of the battery module; a current-carrying plate that is stacked between the battery modules so that an end of the current-carrying plate is positioned inside the end of the battery module, and that electrically connects the battery modules; a cooler that is stacked between the battery modules so that an end portion of the cooler is positioned inside an end portion of the battery module, and that cools the battery module; a filler that is filled in the case and bonds the battery module, the current-carrying plate, and the cooler to one another and fixes them in the case; A battery pack comprising:

2. The battery pack according to claim 1 , wherein the current-carrying plate or the cooler has a protruding portion that extends beyond an end of the battery module to an outer side.

3. The battery pack according to claim 2 , wherein the protruding portion extending from the cooler has a cooling flow path formed therein.

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

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