JP2013143207A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack having a high strength shock mitigation function in which a degree-of-freedom of internal component arrangement is enhanced.SOLUTION: The battery pack includes a plurality of unit cells, a battery holder for fixing the unit cells, a support base at each corner of the lower surface of the battery holder, and an outer case for encasing the unit cells and the battery holder. The outer case and the support base are in contact with each other, but the outer case and the battery holder are not in contact with each other. Since a shock applied to the battery pack is absorbed by the support base, the shock applied to the battery holder is mitigated. Damage on the plurality of unit cells or the internal components fixed to the battery holder is thereby minimized, and the interior of the battery can be protected.

Description

  The present invention relates to a battery pack in which a large number of secondary batteries such as lithium ions are accommodated in an outer case and a battery holder, and the battery holder has an impact mitigating function.

  In a battery pack that houses a plurality of lithium ion secondary batteries, the lithium ion secondary battery is placed in a fixed position by a battery holder and housed in an outer case. In addition, it is necessary to incorporate a board and a connector to be connected to the battery, to secure a space for arranging these inside the battery pack, and to prevent a shock and vibration from the outside.

  In recent years, many high-capacity battery packs have been developed, and the capacity has been further increased. Therefore, the weight of the battery pack is increasing. Conventionally, in a battery pack that accommodates a large number of batteries, it is essential to strengthen the structure to mitigate external impacts in order to protect internal parts.

JP 2008-66001 A

  However, the conventional battery pack impact mitigation configuration as disclosed in Patent Document 1 is insufficient in strength to mitigate the impact while supporting the weight of the battery pack increased by increasing the capacity. In order to increase the strength with this configuration, it is necessary to increase the wall thickness of the supporting side wall, but this method may cause molding defects and cost increase. Furthermore, since the impact is mitigated by the supporting sidewalls around the entire circumference of the battery holder, there is a problem that the arrangement of connectors and boards is limited.

  The present invention solves the above-mentioned conventional problems, and provides a battery pack that has an impact mitigation function that is inexpensive and has high strength, and has an increased degree of freedom in the arrangement of internal components, with respect to a battery pack that has been increased in capacity. The purpose is to do.

  In order to solve the above conventional problems, the battery pack of the present invention includes a plurality of unit cells, a battery holder for fixing the unit cells, a support base at each corner portion of the lower surface of the battery holder, the unit cells and the battery holder. The exterior case and the battery holder are in contact with each other, and the exterior case and the battery holder are not in contact with each other. There is a space where internal components can be placed.

  Moreover, it becomes a very cheap structure by integrally molding a battery holder and four support bases.

  With this configuration, the support base absorbs external shocks and mitigates internal damage.

According to the battery pack structure of the present invention, the contact portion between the outer case and the battery holder exists individually on the surface of each support base, and the impact on the battery pack is mitigated by the support base. While protecting the inside of the battery with minimal damage to the battery,
By dividing the support base into four parts, an impact mitigation structure can be realized in a small space, and there is a space between the case and the support base where no external impact is transmitted, so internal parts can be freely arranged. , Improve the internal design.

The exploded perspective view of the battery pack in Example 1 of this invention The bottom view of the internal component of the battery pack in Example 1 of this invention The side view of the internal components of the battery pack in Example 1 of this invention The front view of the battery holder of the battery pack in Example 1 of this invention Sectional drawing of the battery pack in Example 1 of this invention

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view of a battery pack according to Embodiment 1 of the present invention.

  An embodiment of the present invention will be described below with reference to FIG. The battery pack 10 of the present invention includes an upper case 11 as an outer case, a lower case 12, a plurality of lithium ion secondary batteries 13, and four support bases 15 for fixing the lithium ion secondary batteries 13. The battery holder 14, the protection circuit board 16, the connector 17, and the lead wire 18 are configured.

  In the internal space formed by the upper case 11 and the lower case 12, a rechargeable lithium ion secondary battery 13 connected to each other by a nickel lead plate or the like (not shown) or a lead wire 18, and a rechargeable battery A protective circuit board 16 for controlling discharge and a pair of battery holders 14 (plastic materials such as polycarbonate (PC) or acrylonitrile butadiene styrene (ABS)) for fixing a plurality of lithium ion secondary batteries 13 are provided. Built in. Further, a window for connecting to the apparatus main body is provided at the bottom of the lower case 12, and a connector 17 serving as a connection terminal exists in this window.

  FIG. 2 is a bottom view of internal components of the battery pack according to the first embodiment of the present invention, and FIG. 3 is a side view of internal components of the battery pack according to the first embodiment of the present invention.

  According to the configuration of the battery pack of the present invention, the support base 15 attached to the battery holder 14 serves as a shock absorber against an external impact and serves to protect the internal components. Since the support base 15 is divided into four parts, the impact mitigation part becomes a small space, and a space for arranging internal components such as the connector 17 and the lead wire 18 between the battery holder 14 and the lower case 12 is provided. It can be secured.

  Furthermore, since the battery holder 14 and the support base 15 are integrally molded, the battery holder 14 and the support base 15 are very inexpensive compared to a configuration that requires separate parts such as a spring, a damper, and a shock absorber.

  FIG. 4 shows the rib shape of the support base 15 of the battery holder 14 of the battery pack according to the first embodiment of the present invention.

  Ribs 19 having a thickness of 1 mm are arranged in the vertical direction on the support base 15 of the battery holder 14 at intervals of about 5 mm. The vertical ribs 19 increase the repulsive force that supports the weight of internal components and absorb the impact. It has a shape that is easy to do. Furthermore, since the longitudinal rib 19 has a simple rib shape, there is an advantage that resin molding is easy.

  FIG. 5 is a view showing a contact surface between the lower case 12 which is an exterior case and the battery holder 14.

  The four support bases 15 produced by integral molding with the battery holder 14 have a shape protruding from the battery holder 14 to the side by about 2 mm, and only the side surface and the bottom surface of the support base 15 are the lower case 12 and the surface, respectively. In contact. As a result, the support 15 absorbs the impact not only in the vertical direction but also in the lateral and oblique directions on the battery pack, effectively reducing the damage to the inside.

  According to such a configuration, since only the support base is in contact with the outer case and the battery holder is not in contact with the outer case, the support base absorbs the impact even when an impact is applied to the battery pack. The inside of the battery can be protected while minimizing damage to a plurality of unit cells and internal components fixed to the battery holder.

  The high-capacity battery pack incorporating a plurality of batteries according to the present invention enables free arrangement of internal components while maintaining the conventional impact resistance, so that the high-capacity battery pack for high-power electric motors that require impact resistance is available. Useful as a pack configuration.

DESCRIPTION OF SYMBOLS 10 Battery pack 11 Upper case 12 Lower case 13 Lithium ion secondary battery 14 Battery holder 15 Support stand 16 Protection circuit board 17 Connector 18 Lead wire 19 Rib

Claims (3)

A plurality of unit cells,
A battery holder for fixing the unit cell;
A support base at each corner of the lower surface of the battery holder;
An exterior case containing the unit cell and the battery holder;
The battery pack, wherein the outer case and the support stand are in contact with each other, and the outer case and the battery holder are not in contact with each other. The battery pack according to claim 1, further comprising a buffer material that contacts the outer case on an upper surface or an upper portion of the battery holder. The battery pack according to claim 1, wherein the support base includes a plurality of vertical ribs and spaces.