US-12626985-B2 - Battery pack, electrical device, and electrical device main body

US12626985B2US 12626985 B2US12626985 B2US 12626985B2US-12626985-B2

Abstract

A battery pack includes: a first case having a slot portion exposing a battery-side terminal portion and a guide portion guiding attachment to an electrical device main body; a second case defining a space accommodating a battery cell by being joined with the first case; a separator holding the battery cell; a circuit board fixed to a side of the separator facing the first case; and the battery-side terminal portion is fixed at a position corresponding to the slot portion of the circuit board and connectable to a main body side terminal of an electrical device main body. The separator has a connecting portion provided around the circuit board when viewed from above, at a position facing the first case, and the first case has a connected portion connected to the connecting portion at a portion corresponding to the connecting portion.

Inventors

Toshiyuki Yoshida
Hiroyuki Hanawa
Shota Kanno

Assignees

KOKI HOLDINGS CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20211029
Priority Date: 20201127

Claims (12)

1 . A battery pack, comprising: a first case having a slot portion for exposing a battery-side terminal portion and a guide portion for guiding attachment to an electrical device main body; a second case for defining a space for accommodating a battery cell by being joined with the first case; a separator holding the battery cell; and a circuit board fixed to a side of the separator facing the first case; the battery-side terminal portion fixed at a position corresponding to the slot portion of the circuit board and configured to be connectable to a main body side terminal portion of the electrical device main body, wherein the separator has a connecting portion provided around the circuit board when viewed from above, at a position facing the first case, and the first case has a connected portion connected to the connecting portion at a portion corresponding to the connecting portion, wherein the connecting portion is one of a hook and a concave portion formed on the separator, the connected portion is the other of the hook and the concave portion formed on the first case, and when separating the first case and the second case in a joined state, the separator is held on the side of the first case by a locked state between the hook and the concave portion.
2 . The battery pack according to claim 1 , wherein the hook and the concave portion are maintained in a contact state or a non-contact state when the first case and the second case are joined together.
3 . The battery pack according to claim 1 , wherein a plurality of screw holes are provided on one side of the first case and the second case; a plurality of female screws corresponding to the screw holes are provided on the other side of the first case and the second case; the first case and the second case are screwed with a plurality of screws in a state where the separator is accommodated in the first case and the second case, a longitudinal direction of the screw is oriented in the same direction as the joining direction; and an extending direction of the connecting portion is perpendicular to the joining direction.
4 . The battery pack according to claim 1 , wherein the battery-side terminal portion has a plurality of terminals arranged in parallel on the circuit board, and the connecting portion has a first connecting portion provided at a location located on both sides of the plurality of terminals in a parallel direction.
5 . The battery pack according to claim 4 , wherein the battery cell is cylindrical and supported by the separator so as to extend in the parallel direction of the plurality of terminals, and the connecting portion has a second connecting portion provided at an end portion of the separator in a front-rear direction, near a center in the parallel direction.
6 . The battery pack according to claim 5 , wherein the second connecting portion is provided on both sides of the separator in the front-rear direction.
7 . The battery pack according to claim 1 , wherein the first case has a protruding portion that protrudes inward from an inner wall of the first case in order to restrict movement of the battery cell in the space for accommodating the battery cell defined by the second case being joined with the first case, and the connected portion is provided on the protruding portion.
8 . The battery pack according to claim 1 , comprising: a latch mechanism provided in the first case for attachment and detachment to and from the electrical device main body, wherein the latch mechanism is positioned between the separator and the first case in a state in which the connecting portion and the connected portion are held.
9 . A battery pack, comprising: a first case having a slot portion for exposing a battery-side terminal portion and a guide portion for guiding attachment to an electrical device main body; a second case for defining a space for accommodating a battery cell by being joined with the first case; a separator holding the battery cell; and a circuit board fixed to a side of the separator facing the first case; the battery-side terminal portion fixed at a position corresponding to the slot portion of the circuit board and configured to be connectable to a main body side terminal portion of the electrical device main body, wherein the separator has a connecting portion provided around the circuit board when viewed from above, at a position facing the first case, the first case has a connected portion connected to the connecting portion at a portion corresponding to the connecting portion, wherein the connecting portion has a hole provided in the separator, and a fastening member provided separately from the separator and penetrating the hole, and the connected portion has a fastening hole into which the fastening member is inserted.
10 . The battery pack according to claim 1 , wherein the hook elastically deforms and fits into the concave portion.
11 . An electrical device, comprising: the battery pack according to claim 1 ; and an electrical device main body having a battery pack attachment portion to which the battery pack is attached, and a main body side terminal portion provided in the battery pack attachment portion and connected to a battery-side terminal portion.
12 . An electrical device main body, comprising: a battery pack attachment portion to which the battery pack according to claim 1 is attached; and a main body side terminal portion provided in the battery pack attachment portion and connected to a battery-side terminal portion of the battery pack.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a 371 application of the International PCT application serial no. PCT/JP2021/039958, filed on Oct. 29, 2021, which claims the priority benefits of Japan Patent Application No. 2020-196807, filed on Nov. 27, 2020. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification. TECHNICAL FIELD This invention relates to a battery pack, an electrical device, and an electrical device main body. RELATED ART Cordless electrical devices driven by battery packs using secondary batteries such as lithium ion batteries are widely used. For example, in a hand-held electric tool that drives a front tool by a motor, a battery pack that accommodates multiple secondary battery cells is used as a power source, and electric energy stored in the battery pack is used to drive a load device such as a motor. The battery pack is configured to be detachable from an electrical device main body, and when the voltage drops due to discharge, the battery pack is removed from the electrical device main body and charged using an external charger. As an example of such a battery pack, the technique disclosed in Patent Literature 1 is known. In Patent Literature 1, a battery cell and a separator holding the battery cell are accommodated in a case, and a latch mechanism for attachment and detachment to and from the electrical device main body is provided. CITATION LIST Patent Literature [Patent Literature 1] JP 2019-46588 A SUMMARY OF INVENTION Technical Problems In the configuration of Patent Literature 1, in the state that the battery pack is attached to the electrical device main body, there is a possibility that the battery cell (terminal portion) may shift when the lower case is separated from the upper case for some reasons (such as aging). In order to prevent the terminal portions from being shifted from the upper case, it is conceivable to fix the terminal portions to the upper case side, but when the battery cell and separator are accommodated in the lower case, and only the terminal portion side is fixed to the upper case, there is a problem that the assemblability is deteriorated. It is also conceivable to fix the battery cell (separator) and the terminal portion to the upper case, but depending on the fixing method, it is necessary to provide a through hole in the circuit board placed above the separator, and there is a problem that the region for arranging components on the circuit board become narrower, or that the area of the board needs to be increased. This invention has been made in view of the above background, and an object of this invention is to provide a battery pack in which the terminal portion of the battery pack is prevented from being shifted from the case side constituting a rail portion, and an electrical device using the same. Another object of this invention is to provide a battery pack capable of stably holding a case in which a rail portion of a battery pack is arranged and an assembly for fixing the terminal portion or suppressing breakage when disassembled or damaged, without impeding the assemblability of the battery pack, and an electrical device using the same. Still another object of this invention is to provide a battery pack and an electrical device that do not increase the area (narrow the component arrangement area) of the circuit board of the battery pack. Solution to Problem The typical features of the invention disclosed in the present application are as follows. According to one feature of this invention, a battery pack includes: a first case having a slot portion for exposing a battery-side terminal portion and a guide portion for guiding attachment to an electrical device main body; a second case defining a space for accommodating a battery cell by being joined with the first case; a separator holding the battery cell; a circuit board fixed to a side of the separator facing the first case; and the battery-side terminal portion is fixed at a position corresponding to the slot portion of the circuit board and configured to be connectable to a main body side terminal of an electrical device main body. The separator has a connecting portion provided around the circuit board when viewed from above, at a position facing the first case, and the first case has a connected portion connected to the connecting portion at a portion corresponding to the connecting portion. The connecting portion is a hook formed on one side of the separator side or the first case, and the connected portion is a concave portion formed on the other side of the separator side or the first case. When separating the joined first case the second case, the separator is held on the side of the first case in a locked state between the hook and the concave portion. Further, in the battery pack, the locked state is maintained in a contact state or a non-contact state between the hook and the co