CN-116018711-B - Battery pack, electric tool, and electric vehicle

Abstract

The battery having an increased temperature is effectively cooled. A battery pack includes an exterior case, a battery holder, and a heat absorbing portion configured to absorb heat by phase transition, the battery holder including a first battery holder that holds an electrode portion of the battery, and a second battery holder that surrounds a main body portion of the battery, the second battery holder including a cell portion, the heat absorbing portion being accommodated in the cell portion.

Inventors

• SUGIYAMA MASAKO

Assignees

• 株式会社村田制作所

Dates

Publication Date

20260508

Application Date

20211125

Priority Date

20201203

Claims (11)

1. 1. A battery pack, comprising: An outer housing; A battery; Battery holder A heat-absorbing portion, The heat absorbing portion is configured to absorb heat by phase change, The battery holder has a first battery holder that holds an electrode portion of the battery, and a second battery holder that surrounds a main body portion of the battery, The second battery holder has a pool portion, The heat absorbing part is accommodated in the pool part, A blocking part is arranged between the electrode part and the cell part, The blocking portion is constituted by a first elastic member surrounding the electrode portion, The blocking portion is made of a resin disposed between the first battery holder and the battery, The first elastic member is formed with a convex portion protruding from one main surface of a base of the first elastic member.
2. 2. The battery pack according to claim 1, wherein, The battery is a cylindrical battery having the electrode parts at both ends, The first battery holder has a third battery holder and a fourth battery holder, The third battery holder holds one of the electrode portions at both ends, the fourth battery holder holds the other of the electrode portions at both ends, The second battery holder is configured to be sandwiched between two battery holders possessed by the first battery holder.
3. 3. The battery pack according to claim 2, wherein, The battery holder holds a plurality of the batteries, The pool portion is formed between a plurality of the batteries.
4. 4. The battery pack according to any one of claim 1 to 3, wherein, The second battery holder has a holding portion that contacts the battery.
5. 5. The battery pack according to claim 4, wherein, The holding portion has a plurality of slits.
6. 6. The battery pack according to claim 1, wherein, The battery pack further has tabs welded to the electrode parts, The blocking portion is crushed by the tab and the battery welded to the tab.
7. 7. The battery pack according to any one of claim 1 to 3, wherein, The battery holder has a second elastic member sandwiched by the first battery holder and the second battery holder.
8. 8. The battery pack according to any one of claim 1 to 3, wherein, The heat absorbing part is provided with paraffin.
9. 9. The battery pack according to any one of claim 1 to 3, wherein, The heat absorbing portion is composed of a plurality of microcapsules containing a phase change material.
10. 10. A power tool having the battery pack of any one of claims 1 to 9.
11. 11. An electric vehicle having the battery pack of any one of claims 1 to 9.

Description

Battery pack, electric tool, and electric vehicle Technical Field The invention relates to a battery pack, an electric tool, and an electric vehicle. Background Conventionally, a technique for cooling a battery that generates heat has been proposed. For example, patent document 1 discloses a technique in which a heat storage material container including a heat storage material is housed in a battery pack together with a battery, whereby the heat storage material in the heat storage material container absorbs heat generated by heat generation of the battery. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2002-29670 Disclosure of Invention Technical problem to be solved by the invention In the technique of patent document 1, the heat storage material container needs to be housed in the battery pack, and thus the volumetric energy density of the battery pack is reduced. In addition, the heat storage material container is housed in the battery pack, which leads to an increase in the size and weight of the battery pack. Accordingly, an object of the present invention is to provide a battery pack, an electric tool, and an electric vehicle, which effectively cool a battery having an increased temperature without causing a decrease in the volumetric energy density of the battery pack. Technical scheme for solving technical problems In order to solve the above technical problems, the present invention is a battery pack comprising: An outer housing; A battery; Battery holder A heat-absorbing portion, The heat absorbing portion is configured to absorb heat by phase change, The battery holder has a first battery holder that holds an electrode portion of the battery, and a second battery holder that surrounds a main body portion of the battery, The second battery holder has a pool portion, The heat absorbing portion is accommodated in the pool portion. Effects of the invention According to at least the embodiments of the present invention, the battery having an increased temperature can be efficiently cooled without incurring a decrease in the volumetric energy density of the battery pack or the like. It should be noted that the content of the present invention is not to be interpreted as being limited by the effects exemplified in the present specification. Drawings Fig. 1 is a view showing an external appearance of a battery pack according to an embodiment. Fig. 2 is an exploded perspective view of a battery cell according to an embodiment. Fig. 3a and 3B are diagrams to be referred to when explaining an intermediate holder according to an embodiment. Fig. 4 is a diagram for explaining a pool portion according to an embodiment. Fig. 5 is a diagram for explaining a heat absorbing portion according to an embodiment. Fig. 6 is a diagram for explaining a heat absorbing portion according to an embodiment. Fig. 7 is a diagram for explaining a heat absorbing portion according to an embodiment. Fig. 8 is a diagram for explaining a heat absorbing portion according to an embodiment. Fig. 9 is a diagram showing an elastic member according to an embodiment. Fig. 10 is a diagram showing a state in which an elastic member is attached to a battery according to an embodiment. Fig. 11 is a diagram showing a state in which an elastic member is attached to a battery according to an embodiment. Fig. 12a and 12B are diagrams to be referred to when the elastic member according to the embodiment is operated. Fig. 13 is a diagram for explaining a modification. Fig. 14 is a diagram for explaining a modification. Fig. 15 a to 15D are diagrams for explaining a modification. Fig. 16 is a diagram for explaining a modification. Fig. 17 is a diagram for explaining an application example. Fig. 18 is a diagram for explaining an application example. Detailed Description Embodiments of the present invention will be described below with reference to the drawings. Note that the description is made in the following order. < One embodiment > < Modification > < Application example > The embodiments and the like described below are suitable specific examples of the present invention, and the present invention is not limited to these embodiments and the like. It is noted that the components shown in the claims are not specific to the components of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, vertical and horizontal directions of the constituent members described in the embodiments are not intended to limit the scope of the present invention unless otherwise specifically defined, but are merely illustrative examples. The sizes, positional relationships, and the like of the components shown in the drawings may be exaggerated for clarity of description, and in order to prevent the drawings from becoming complicated, only a part of the reference numerals may be illustrated or a part of the drawings may be simplified. In the following description, the same names and symbols denote