Battery venting system

• US 7,189,473 B2
• Filed: 06/03/2003
• Issued: 03/13/2007
• Est. Priority Date: 06/03/2003
• Status: Active Grant

• Current Assignee: Techtronic Power Tools Technology Limited (Techtronic Industries Company Limited)
• Original Assignee: Eastway Fair Company Limited
• Inventors: Liu, Xiao Ping, Smith, Roger Q.
• Primary Examiner(s): Kalafut; Stephen J.
• Application Number:
  US10/453,836
• Publication Number:
  US 20040247996A1
• Time in Patent Office: 1,379 Days
• Field of Search: 429/82, 429/87, 429/99, 429/120, 429/148, 429/159
• US Class Current: 429/82
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/6235 Power tools
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/653 characterised by electrically insulating or thermally conductive materials
• CPC Class Codes: H01M 10/6551 Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
• CPC Class Codes: H01M 10/6557 arranged between the cells
• CPC Class Codes: H01M 10/6563 with forced flow, e.g. by blowers
• CPC Class Codes: H01M 10/6566 Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers H01M10/6565 takes precedence
• CPC Class Codes: H01M 50/107 having curved cross-section, e.g. round or elliptic H01M50/103, H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 6/42 Grouping of primary cells into batteries H01M6/40 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery venting system that is useful for cordless power tools. The system can include a cell that may have a sleeve with a plurality of apertures surrounding a peripheral side face of the cell to enhance heat dissipation from the cell. A plurality of cells may be electrically connected to form a cell pack. A carrier includes an upper carrier and a lower carrier to sandwich a plurality of cells that are aligned parallel to each other. The carriers include at least one vent hole that are aligned with a gap formed from adjacent cells to define an elongated fluid flow path. A charger may be provided to receive a housing containing the carrier and may be provided with a fan to direct a flow into the fluid flow path.

Claims

1. A battery venting system comprising at least one cell that includes:

a. a first end having a positive terminal;

b. a second end having a negative terminal, the second end spaced from the first end to define a longitudinal extent of the cell;

c. a peripheral side face disposed between the first end and the second end; and

d. a sleeve surrounding the perimeter of the peripheral side face of the cell along at least a portion of the longitudinal extent of the cell, wherein the sleeve is provided with a plurality of apertures and is formed from an electrically insulating material.

2. The battery venting system of claim 1 wherein the sleeve is formed from a plastic mesh.

3. The battery venting system of claim 1 wherein the apertures have a shape selected from the group consisting of a circle, ellipse, parabolic, crescent, obround, disc, triangle, rectangular, polygonal, and mixtures thereof.

4. The battery venting system of claim 1 wherein the apertures have a shape with at least one long side and at least one short side such that the at least one long side is parallel to the longitudinal axis.

5. The battery venting system of claim 1 wherein the apertures have a shape with at least one long side and at least one short side such that the at least one long side is normal to the longitudinal axis.

6. A battery venting system comprising:

a. a plurality of cells arranged side by side to define at least some adjacent cells with each cell comprising;

i. a first end having a positive terminal,

ii. a second end having a negative terminal, the second end spaced from the first end to define a longitudinal extent of the cell,

iii. a peripheral side face disposed between the first end and the second end,

iv. a sleeve surrounding the perimeter of the peripheral side face of the cell alone at least a portion of the longitudinal extent of the cell, wherein the sleeve is provided with a plurality of apertures and is formed from an electrically insulating material; and

,

b. a plurality of electrically conductive connecting members attached to one of the first end or one of the second end of at least some of the adjacent cells.

7. The battery venting system of claim 6 wherein the apertures have a shape selected from the group consisting of a circle, ellipse, parabolic, crescent, obround, disc, triangle, rectangular, polygonal, and mixtures thereof.

8. The battery venting system of claim 6 wherein the apertures have a shape with at least one long side and at least one short side such that the at least one long side is parallel to the longitudinal axis.

9. The battery venting system of claim 6 wherein the apertures have a shape with at least one long side and at least one short side such that the at least one long side is normal to the longitudinal axis.

10. A battery venting system comprising:

a. a plurality of cells with at least one cell including a first end, a second end spaced from the first end to define a longitudinal extent of the cell, a peripheral side face disposed between the first end and the second end; and

a sleeve formed from an electrically insulating material and surrounding the perimeter of the peripheral side face of the cell alone at least a portion of the longitudinal extent of the cell, wherein the sleeve is provided with a plurality of apertures;

b. an upper carrier having a plurality of spaced apart ribs extending from a major surface to selectively position one of a plurality of cells;

c. a lower carrier having a plurality of ribs extending from a major surface to selectively position a plurality of cells and to sandwich the plurality of cells between the upper carrier and the lower carrier such that the plurality of cells are aligned parallel to each other to define a gap between adjacent cells;

d. a plurality of vent openings disposed on the upper carrier; and

,

e. a plurality of vent openings disposed on the lower carrier, wherein an elongated fluid flow path is defined by the vent openings and the gap.

11. The battery venting system of claim 10 wherein the cells are cylindrical.

12. The battery venting system of claim 11 wherein the cells have a first end, a second end, and a peripheral side face disposed between the first end and the second end and wherein the upper and lower carrier causes the ends to lie in a plane parallel to a plane of the upper and lower carrier.

13. The battery venting system of claim 11 further comprising at least one connecting member cut out provided on at least one of the upper carrier, the lower carrier, or both.

14. The battery venting system of claim 13 further comprising a plurality of electrically conductive connecting members attached to one of the first end or one of the second end of at least some of the adjacent cells.

15. The battery venting system of claim 10 wherein a portion of at least one opening on the upper carrier is aligned with a gap.

16. The battery venting system of claim 10 wherein a portion of at least one opening on the lower carrier is aligned with a gap.

17. The battery venting system of claim 10 wherein the cells are housed in a housing.

18. The battery venting system of claim 17 wherein the housing is removably coupled with a cordless power tool.

19. The battery venting system of claim 10 further comprising a plurality of spaced apart ribs extending from the major surface of the lower carrier to selectively position one of a plurality of cells.

20. The battery venting system of claim 10 wherein the vent openings near a center portion of the upper carrier have a size larger than the vent openings near a periphery of the upper carrier.

21. The battery venting system of claim 10 wherein the vent openings near a center portion of the lower carrier have a size larger than the vent openings near a periphery of the lower carrier.