JP2002313294A - Battery pack - Google Patents

Abstract

(57) [Problem] To provide a battery pack in which a connecting plate for connecting a plurality of cells in series is difficult to be cut. SOLUTION: A battery assembly 1 constituted by connecting a plurality of unit cells in series via a connecting plate and outer frames 2, 3 are provided.
And the cushioning materials 4, 5, 7 provided between them are projected outside the outer frames 2, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack such as a storage battery used as a power source for a cordless power tool (hereinafter simply referred to as a power tool).

[0002]

2. Description of the Related Art An example of a conventional battery pack will be described with reference to FIG.

A conventional battery pack is, as shown in FIG.
A battery assembly 1 in which a plurality of unit cells are connected in series by a connecting plate of nickel or the like is housed in a split lower outer frame 2 and an upper outer frame 3. When the battery pack is attached to a power tool such as a driver drill or an impact driver and the work is performed, the vibration and impact of the power tool cause the battery assembly 1
And the connection plate connecting the unit cells may be cut, so the cushioning material 6 is inserted between the battery assembly 1 and the lower outer frame 2. Also, depending on the type of battery pack, FIG.
In some cases, the cushioning member 7 is inserted between the battery assembly 1 and the upper outer frame 3 as described above. In addition, the cushioning materials 6 and 7 are usually
It is formed of an inexpensive CR sponge or the like.

[0004]

The conventional battery pack is:
Although the cushioning member 6 is inserted between the battery assembly 1 and the lower outer frame 2, the cushioning member 6 is easily damaged by the heat generated from the battery assembly 1 when the power tool is used, that is, when the battery is discharged. When the cushioning member 6 is loose, the elastic force is lost, and the vibration and impact transmitted to the battery assembly 1 increase, and the connection plate connecting the unit cells may be cut.

An object of the present invention is to solve the above-mentioned disadvantages and to provide a battery pack in which a connection plate is hardly cut.

[0006]

The above object is achieved by disposing the cushioning material so as to protrude from the surface of the outer frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the battery pack of the present invention will be described with reference to FIGS. Note that the same reference numerals are given to components having the same configuration as the above-described conventional example, and description thereof will be omitted.

As shown in FIG. 1, a buffer material 4 made of a CR sponge or the like is inserted between a battery assembly 1 and a lower outer frame 2 in the battery pack. 2 is provided so as to protrude from the surface. The heat generated from the battery assembly 1 when the power tool is used is transmitted to the cushioning material 4. However, since the cushioning material 4 projects to the surface of the lower outer frame 2, the heat is efficiently radiated to the atmosphere. It becomes difficult to set. If the cushioning member 4 that absorbs the vibration of the battery assembly 1 is not loosened, the elastic force is not lost, and the connection plate connecting the unit cells is hard to be cut.

FIG. 2 shows another embodiment of the battery pack of the present invention. Although the cushioning member 4 is an elastomer molded simultaneously with the lower outer frame 2, since the elastomer has rubber-like elasticity at room temperature, it is suitable as a cushioning member for absorbing the vibration of the battery assembly 1 at the same time. Also, vibration applied to the lower outer frame 2 from outside can be absorbed. In this embodiment, since the upper outer frame 3 is also provided with the buffer material 5 protruding from the surface of the upper outer frame 3, the heat generated from the battery assembly 1 can be more effectively radiated to the atmosphere. .

[0010]

According to the present invention, since the cushioning member is provided so as to protrude from the surface of the outer frame, it is possible to suppress the settling of the cushioning member due to heat generated from the battery assembly, and It is possible to provide a battery pack that is difficult to cut.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the battery pack of the present invention.

FIG. 2 is a sectional view showing another embodiment of the battery pack of the present invention.

FIG. 3 is a sectional view showing an example of a conventional battery pack.

[Explanation of symbols]

1 is a battery assembly, 2 is a lower outer frame, 3 is an upper outer frame, and 4 to 7 are cushioning materials.

Claims (2)

[Claims] 1. A battery assembly having a plurality of unit cells connected in series by a connecting plate, a split outer frame for housing the battery assembly, and a cushioning material provided between the battery assembly and the outer frame. A battery pack according to claim 1, wherein the cushioning member is disposed so as to protrude from the surface of the outer frame. 2. The battery pack according to claim 1, wherein the cushioning material is an elastomer molded simultaneously with the outer frame.