Battery pack for power tool

Patent metadata

Field	Value
Publication number	US-9601729-B2
Application number	US-201514618039-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Mar 3, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A power-tool battery pack usable as a power supply of a power tool and capable of slidably attaching to and detaching from a tool main body of the power tool includes a battery main body and a case that houses the battery main body. The battery main body includes a female terminal having inner sides configured to electrically connect to and sandwich a male terminal slidably attachable to the battery pack. The case includes a case main body and a case-cover part. The case-cover part has an opening for receiving the male terminal and sandwiching-wall parts for sandwiching the female terminal from outer sides of the female terminal. The female terminal and the sandwiching-wall parts are configured such that, at least when the female terminal sandwiches the male terminal, parts of the female terminal facing the sandwiching-wall parts are caused to touch the sandwiching-wall parts.

First claim

I claim:

1. A power-tool battery pack usable as a power supply of a power tool and capable of slidably attaching to and detaching from a tool main body of the power tool, the power-tool battery pack comprising:
at least one battery cell;
a case housing the at least one battery cell; and
a female terminal having inner sides configured to electrically connect to and sandwich a counterpart side male terminal of the tool main body as the battery pack is slidably attached to the tool main body, the female terminal being electrically connectable to the at least one battery cell;
wherein the case comprises a case main body housing the at least one battery cell and a case-cover part connected to the case main body;
the case-cover part comprises a female opening, which is configured to receive the male terminal, and sandwiching-wall parts, which are configured to sandwich the female terminal from outer sides of the female terminal; and
the female terminal and the sandwiching-wall parts are configured such that, at least when the female terminal sandwiches the male terminal, parts of the outer sides of the female terminal facing the sandwiching-wall parts serve as abutting-support parts and are caused to touch the sandwiching-wall parts.

2. The power-tool battery pack according to claim 1 , wherein the female terminal and the sandwiching-wall parts are configured such that the female terminal and the sandwiching-wall parts do not contact and are spaced apart from one another when the female terminal is not sandwiching the male terminal.

3. The power-tool battery pack according to claim 1 , wherein the female terminal comprises:
a support-seat part coupled to a circuit board,
terminal parts for sandwiching the male terminal, and
support-frame parts continuously connecting the support-seat part and the terminal parts; and
wherein the abutting-support parts of the female terminal are provided on the support-frame parts.

4. The power-tool battery pack according to claim 3 , wherein a length of the abutting-support parts proximate to the support-seat part corresponds to a length of the support-seat part.

5. The power-tool battery pack according to claim 3 , wherein the abutting-support parts are spaced from the sandwiching-wall parts by a smaller distance than the terminal parts are spaced from the sandwiching-wall parts.

6. The power-tool battery pack according to claim 1 , wherein the sandwiching-wall parts each extend in an attachment-detachment sliding direction and demarcate an outer perimeter of the female terminal.

7. The power-tool battery pack according to claim 1 , wherein the portions of the sandwiching-wall parts respectively contacted by the abutting-support parts each includes a contact-rib part that projects toward the female terminal.

8. The power-tool battery pack according to claim 3 , wherein:
the circuit board extends in an attachment-detachment sliding direction;
the terminal parts of the female terminal extend in the attachment-detachment sliding direction; and
the support-frame parts of the female terminal extend in directions orthogonal to the attachment-detachment sliding direction.

9. The power-tool battery pack according to claim 3 , wherein:
portions of the support-frame parts that are adjacent to the support-seat part extend in an attachment-detachment sliding direction; and
portions of the abutting-support parts that are adjacent to the support-seat part also extend in the attachment-detachment sliding direction.

10. The power-tool battery pack according to claim 1 , wherein the female terminal is configured to be mirror-symmetric with respect to the male terminal when the female terminal sandwiches the male terminal.

11. The power-tool battery pack according to claim 3 , wherein
end edges of the support-frame parts are folded in directions that intersect an attachment-detachment sliding direction.

12. The power-tool battery pack according to claim 1 , wherein:
the female terminal comprises: a support-seat part coupled to a circuit board, terminal parts for sandwiching the male terminal, and support-frame parts continuously connecting the support-seat part and the terminal parts;
the abutting-support parts of the female terminal are provided on the support-frame parts;
the abutting-support parts are spaced from the sandwiching-wall parts by a smaller distance than the terminal parts are spaced from the sandwiching-wall parts; and
the portion of the sandwiching-wall part contacted by the abutting-support part includes a contact-rib part that projects toward the female terminal.

13. The power-tool battery pack according to claim 12 , wherein:
the circuit board extends in an attachment-detachment sliding direction;
the terminal parts of the female terminal extend in the attachment-detachment sliding direction; and
the support-frame parts of the female terminal extend in directions orthogonal to the attachment-detachment sliding direction.

14. The power-tool battery pack according to claim 13 wherein:
portions of the support-frame part that are adjacent to the support-seat part extend in the attachment-detachment sliding direction,
portions of the abutting-support parts that are adjacent to the support-seat part extend in the attachment-detachment sliding direction,
the female terminal is configured to be mirror-symmetric with respect to the male terminal when the female terminal sandwiches the male terminal,
end edges of the support-frame parts are folded in directions that intersect the attachment-detachment sliding direction,
a length of the abutting-support parts proximate to the support-seat part corresponds to a length of the support-seat part, and
the sandwiching-wall parts each extend in the attachment-detachment sliding direction and demarcate an outer perimeter of the female terminal.

15. A power-tool battery pack usable as a power supply of a power tool and capable of attaching to and detaching from a tool main body of the power tool by sliding, the power-tool battery pack comprising:
at least one battery cell;
a case housing the at least one battery cell; and
a female terminal having first and second terminal parts having facing inner sides configured to resiliently separate to accommodate and apply an inward pressure against a counterpart male terminal slidingly inserted between the facing inner sides to form an electrical connection with the male terminal, the female terminal being electrically connectable to the at least one battery cell;
wherein the case comprises a case main body housing the at least one battery cell and a case-cover part connected to the case main body;
the case-cover part comprises: (i) an opening configured to receive the male terminal and (ii) sandwiching-wall parts facing one another on opposite sides of the female terminal, the sandwiching-wall parts being at least substantially parallel to the facing inner sides of the first and second terminal parts, and
the first and second terminal parts are configured to be shiftable between a first configuration and a second configuration by inserting the male terminal between the facing inner sides, such that abutting-support parts of the female terminal are spaced from the sandwiching-wall parts in the first configuration and the abutting-support parts of the female terminal contact the sandwiching-wall parts in the second configuration.

16. The power-tool battery pack according to claim 15 , wherein
the female terminal comprises: a support-seat part coupled to a circuit board, and support-frame parts continuously connecting the support-seat part and the f

Assignees

• Makita Corp

Inventors

• Naito Akira

Classifications

• B25F5/00 Primary

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• H01M50/284

  with incorporated circuit boards, e.g. printed circuit boards [PCB] · CPC title

• H01M50/271

  Lids or covers for the racks or secondary casings · CPC title

• H01M50/296

  characterised by terminals of battery packs (terminals of batteries H01M50/543) · CPC title

• H01M50/213

  adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) · CPC title