Battery pack, and manufacturing method of battery pack

Abstract

To provide a battery pack capable of dissipating heat generated by batteries while suppressing the decline in battery storage efficiency, and a manufacturing method of a battery pack.SOLUTION: A battery pack 1 includes multiple battery strings 10A and 10B. Each of the multiple battery strings 10A and 10B has multiple batteries arranged in the thickness direction of the battery. The multiple battery strings 10A, 10B are arranged adjacent to each other in the width direction of the batteries. A first thermally conductive material 11 is disposed adjacent the bottom surface of the battery. Between the batteries constituting each battery string 10A, 10B, a heat insulating material 13 is arranged so as to face the side surface of the battery in the thickness direction. Between the multiple battery strings 10A, 10B, a second thermally conductive material 12 is placed adjacent to the widthwise side of the battery.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a battery pack for dissipating heat generated by a battery and a method for manufacturing the battery pack. [Background technology]

[0002] Various techniques have been proposed for dissipating heat generated in batteries such as secondary batteries. As an example of such a technique, Patent Document 1 discloses a battery pack including a heat insulating member for insulating thin cells adjacent in a first direction (Y direction) from each other, and a heat conducting member in common contact with the surface of each of a plurality of thin cells arranged side by side in a second direction (X direction) that is normal to the first direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-119764 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the battery pack disclosed in Patent Document 1 has a problem in that both a heat insulating member and a heat conducting member are disposed between adjacent batteries in the first direction (Y direction), which reduces the battery accommodation efficiency.

[0005] The present disclosure provides a battery pack and a method for manufacturing the battery pack that are capable of dissipating heat generated by the battery while suppressing a decrease in battery accommodation efficiency. [Means for solving the problem]

[0006] In the battery pack including a plurality of battery strings according to the present disclosure, Each of the plurality of battery rows has a plurality of batteries arranged in the thickness direction of the battery, The battery rows are arranged adjacent to each other in the width direction of the batteries, a first thermally conductive material disposed adjacent to a bottom surface of the battery; Between the batteries constituting each battery row, a heat insulating material is disposed so as to face the side surface of the battery in the thickness direction, and no thermally conductive material is disposed; Between the plurality of battery rows, a second thermally conductive material is disposed adjacent to the side surface of the battery in the width direction.

[0007] The bottom of the second thermally conductive material may be positioned adjacent to the mounting plate on which the battery is positioned.

[0008] The thermal conductivity of the first thermally conductive material and the second thermally conductive material is higher than the thermal conductivity of the heat insulating material.

[0009] The area of ​​the side surface of the battery in the thickness direction is larger than the area of ​​the side surface of the battery in the width direction.

[0010] A method for manufacturing a battery pack including a plurality of battery strings includes the steps of: placing a thermally conductive material on a placement plate; forming a plurality of battery rows by arranging the batteries in a thickness direction of the batteries so that the bottom surface of each battery constituting the battery row is adjacent to the thermally conductive material; a step of placing a heat insulating material between the batteries constituting each battery row so as to face a side surface of the battery in a thickness direction; The method includes a step of disposing a thermally conductive material between the plurality of battery rows so as to be adjacent to the side surfaces of the batteries in the width direction. [Effects of the Invention]

[0011] The present disclosure makes it possible to provide a battery pack and a method for manufacturing a battery pack that are capable of dissipating heat generated by the battery while suppressing a decrease in battery accommodation efficiency. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a battery pack according to the present disclosure. [Figure 2] FIG. 1 is a top view showing a battery pack according to the present disclosure. [Figure 3] FIG. 1 is a side view showing a battery pack according to the present disclosure. [Figure 4] 10 is a flowchart showing a manufacturing method of a battery pack. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment according to the present disclosure will now be described with reference to the drawings. Fig. 1 is a perspective view showing a battery pack 1 according to the present disclosure. The battery pack 1 includes battery strings 10A and 10B. Although Fig. 1 shows two battery strings, the number of battery strings is not limited to this, and the battery pack 1 may include three or more battery strings.

[0014] 1, each of battery strings 10A and 10B is formed by arranging a plurality of batteries in the thickness direction of the batteries, and battery strings 10A and 10B are arranged adjacent to each other in the width direction of the batteries.

[0015] The area of ​​the side surface in the thickness direction of the battery is configured to be larger than the area of ​​the side surface in the width direction of the battery. For example, the area of ​​the side surface in the thickness direction can be seven times or more the area of ​​the side surface in the width direction. However, the ratio of the area of ​​the side surface in the thickness direction to the area of ​​the side surface in the width direction is not limited to this value.

[0016] Between the batteries constituting each battery string 10A, 10B, a heat insulating material 13 is disposed so as to face the side surface of the battery in the thickness direction. For example, the heat insulating material 13 may be disposed adjacent to the side surface of the battery in the thickness direction. As is clear from FIG. 1 , no thermally conductive material is disposed between the batteries constituting each battery string 10A, 10B.

[0017] Specific examples of the insulating material 13 include insulating material made of resin, glass wool, and aerogel insulating material made of silica, which is an inorganic material. The thermal conductivity of the insulating material 13 is preferably lower than that of the thermally conductive material described below. For example, the thermal conductivity of insulating material made of resin is approximately 0.5 W / m K, and the thermal conductivity of aerogel insulating material is approximately 0.03 W / m K.

[0018] The thickness of the insulating material is preferably set so that heat generated in the battery is transferred to other batteries located in the width direction rather than to other batteries located in the thickness direction of the battery. For example, the thickness of the insulating material can be set so that more than 50% of the heat generated by a battery in a thermal runaway state is transferred to other batteries located in the width direction.

[0019] As shown in FIG. 1, a first thermally conductive material 11 is disposed adjacent to the bottom surface of each battery constituting battery strings 10A, 10B. The size of the first thermally conductive material 11 may be the same as the bottom surface of the opposing battery. The thickness of the first thermally conductive material 11 may be any size. Note that in the example shown in FIG. 1, multiple individual first thermally conductive materials 11 are disposed adjacent to the bottom surface of each battery, but in other embodiments, a single first thermally conductive material 11 may be disposed adjacent to the bottom surface of each battery.

[0020] Between the battery rows 10A and 10B, second thermally conductive materials 12 are disposed adjacent to the widthwise side surfaces of the batteries. The size of each second thermally conductive material 12 may be the same as the widthwise side surfaces of adjacent batteries. The thickness of each second thermally conductive material 12 may be any size, taking into consideration heat dissipation performance and storage efficiency.

[0021] Specific examples of the first thermally conductive material 11 and the second thermally conductive material 12 include resin or rubber materials containing insulating ceramic. The thermal conductivity of a resin or rubber material containing ceramic is approximately 2 to 3 W / m·K. The first thermally conductive material 11 and the second thermally conductive material 12 preferably have a higher thermal conductivity than the insulating material 13. Note that if the battery casing is insulated, the first thermally conductive material 11 and the second thermally conductive material 12 do not need to be insulating.

[0022] Fig. 2 is a top view showing the battery pack 1 according to the present disclosure. Fig. 3 is a side view showing the battery pack 1 according to the present disclosure. An example of a case where the battery 100A experiences thermal runaway will be described with reference to Figs. 2 and 3.

[0023] In the event of thermal runaway in battery 100A, as shown in FIG. 2, the presence of heat insulating material 13 prevents heat generated in battery 100A from being transferred to other batteries 101A and 102A located in the thickness direction of battery 100A. Furthermore, the presence of second thermally conductive material 12 allows heat generated in battery 100A to be transferred to other battery 100B located in the width direction of battery 100A. The heat transferred to battery 100B is transferred to arrangement plate 14 via first thermally conductive material 11 disposed adjacent to the bottom surface of battery 100B, as shown in FIG. 3. Similarly, heat generated in battery 100A is transferred to arrangement plate 14 via first thermally conductive material 11 disposed adjacent to the bottom surface of battery 100A.

[0024] Next, we will explain the method for manufacturing the battery pack 1. Figure 4 is a flowchart showing the method for manufacturing the battery pack 1. The method for manufacturing the battery pack 1 includes step S1 of arranging a first thermally conductive material, step S2 of forming a plurality of battery strings, step S3 of arranging a heat insulating material, and step S4 of arranging a second thermally conductive material.

[0025] In step S1, a first thermally conductive material 11 is placed on a battery arrangement plate 14. In step S2, the batteries are arranged in the thickness direction of the batteries so that the bottom surface of each battery constituting the battery row is adjacent to the first thermally conductive material 11, thereby forming multiple battery rows. In step S3, a heat insulating material 13 is placed between the batteries constituting each battery row so that it faces the side surface of the battery in the thickness direction. In step S4, a second thermally conductive material 12 is placed between the multiple battery rows so that it is adjacent to the side surface of the battery in the width direction.

[0026] In the above-described embodiment, the first thermally conductive material 11 is disposed adjacent to the bottom surface of the battery. Between the batteries constituting each battery row 10A, 10B, a heat insulating material 13 is disposed so as to face the side surface of the battery in the thickness direction. Between the battery rows 10A, 10B, a second thermally conductive material 12 is disposed adjacent to the side surface of the battery in the width direction.

[0027] By adopting this configuration, heat generated by a battery experiencing thermal runaway is dissipated from the bottom surface of the battery via the first thermal conductive material 11. Furthermore, heat generated by the battery experiencing thermal runaway is transferred to other batteries located in the width direction of the battery via the second thermal conductive material, and dissipated from the bottom surface of the other batteries via the first thermal conductive material. Furthermore, no thermal conductive material is disposed between the batteries constituting each battery string 10A, 10B. Therefore, heat generated by the batteries can be dissipated while suppressing a decrease in battery accommodation efficiency.

[0028] The present disclosure is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present disclosure. For example, in another embodiment, the bottom of the second thermally conductive material may be arranged adjacent to the arrangement plate 14. This allows heat transferred from the battery in a thermal runaway state to the second thermally conductive material to be released directly to the arrangement plate 14.

[0029] In another embodiment, step S2 and step S3 may be performed simultaneously. Specifically, a plurality of batteries may be arranged in the thickness direction of the battery and a heat insulating material 13 may be disposed between the plurality of batteries in the thickness direction to form a plurality of battery rows. Alternatively, a plurality of batteries may be arranged in the thickness direction of the battery and a heat insulating material 13 and a second thermally conductive material 12 may be disposed to form a plurality of battery rows. [Explanation of symbols]

[0030] 1: Battery pack 10A:Battery row 10B:Battery row 11: First thermal conductive material 12: Second thermal conductive material 13: Heat insulation 14: Placement board 100A: Battery 100B: Battery 101A: Battery 102A: Battery

Claims

1. A battery pack including a plurality of battery strings, Each of the plurality of battery rows has a plurality of batteries arranged in a thickness direction of the batteries, the plurality of battery rows are arranged adjacent to each other in a width direction of the batteries, a first thermally conductive material disposed adjacent to a bottom surface of the battery; Between the batteries constituting each battery row, a heat insulating material is disposed so as to face a side surface of the battery in a thickness direction, and no heat conducting material is disposed; a second thermally conductive material is disposed between the plurality of battery rows adjacent to a side surface of the battery in a width direction; Battery pack.

2. 2. The battery pack according to claim 1, wherein a bottom portion of the second thermally conductive material is disposed adjacent to a mounting plate on which the battery is disposed.

3. The battery pack according to claim 1 , wherein the first thermally conductive material and the second thermally conductive material have a thermal conductivity higher than that of the insulating material.

4. The battery pack according to claim 1 , wherein the area of ​​the side surface of the battery in the thickness direction is larger than the area of ​​the side surface of the battery in the width direction.

5. A method for manufacturing a battery pack including a plurality of battery strings, comprising: placing a thermally conductive material on a placement plate; forming the plurality of battery rows by arranging the batteries in a thickness direction of the batteries so that a bottom surface of each battery constituting the battery row is adjacent to the thermally conductive material; a step of placing a heat insulating material between the batteries constituting each battery row so as to face a side surface of the battery in a thickness direction; a step of disposing a thermally conductive material between the plurality of battery rows so as to be adjacent to a side surface of the battery in a width direction; A method for manufacturing a battery pack comprising:

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